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WO2012057061A1 - Film transparent - Google Patents

Film transparent Download PDF

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Publication number
WO2012057061A1
WO2012057061A1 PCT/JP2011/074405 JP2011074405W WO2012057061A1 WO 2012057061 A1 WO2012057061 A1 WO 2012057061A1 JP 2011074405 W JP2011074405 W JP 2011074405W WO 2012057061 A1 WO2012057061 A1 WO 2012057061A1
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Prior art keywords
transparent film
transparent
refractive index
resin
glass fiber
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PCT/JP2011/074405
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English (en)
Japanese (ja)
Inventor
広次 岸本
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Panasonic Corp
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Panasonic Corp
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
    • C08J5/241—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres
    • C08J5/244—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres using glass fibres

Definitions

  • the present invention relates to a transparent film used for a liquid crystal display substrate or the like.
  • a transparent film made of a transparent resin and a glass fiber substrate has been proposed as having high heat resistance and high dimensional stability against temperature and humidity. (For example, refer to Patent Documents 1 and 2).
  • a high refractive index resin having a higher refractive index than that of glass fiber and a low refractive index resin having a lower refractive index than that of glass fiber are mixed, and the refractive index is that of the glass fiber.
  • the resin composition is prepared so as to approximate Then, a glass fiber base material is impregnated with the resin composition, dried and semi-cured to prepare a prepreg, and the prepreg is heated and pressed to produce a transparent film.
  • An epoxy resin or the like is used as the high refractive index resin and the low refractive index resin.
  • the refractive index of the glass fiber constituting the substrate and the refractive index of the matrix resin (resin composition)
  • the refraction of the light in the transparent film is suppressed, and the transparency of the display with excellent visibility is achieved. It can be used as a film.
  • this transparent film has adhesiveness with conductive films such as ITO films, surface smoothness, gas barrier properties, etc. It attracts attention as a material that can also provide performance.
  • the transparent film is formed into a long shape in advance and wound in a roll shape in consideration of subsequent processes such as the formation of a conductive film such as an ITO film and the formation of a resin layer such as a hard coat layer. Is preferred.
  • a lami roll 16 comprising a pair of rolls 15 as shown in FIG. 3 is used, and a plurality of the long prepregs 4b are formed.
  • the heating and press molding was continuously performed repeatedly (see, for example, Patent Document 3). If it does in this way, the elongate transparent film 1 will be obtained and it can wind in roll shape as it is.
  • the conventional lami roll 16 can only apply a linear pressure to the prepreg 4 and can also apply this linear pressure only for a short time. Therefore, even if the long transparent film 1 is obtained, the entire physical property (especially in the width direction) of the transparent film 1 varies in physical properties such as retardation (phase difference), and has uniform physical properties. There was a problem that not.
  • the present invention has been made in view of the above points, and an object of the present invention is to provide a transparent film having uniform physical properties over the entire surface (particularly in the width direction).
  • the transparent film according to the present invention is a transparent film formed by impregnating a glass fiber base material with a transparent resin composition and curing, and the width of the transparent film is 500 mm or more and in the width direction of the transparent film.
  • the difference in retardation between the central portion and a location 250 mm away from the central portion in the width direction is 0.2 nm or less.
  • a difference in thickness between a central portion in the width direction of the transparent film and a location 250 mm away from the central portion in the width direction is 1 ⁇ m or less.
  • the difference in glass transition temperature (Tg) between the central portion in the width direction of the transparent film and a location 250 mm away from the central portion in the width direction is preferably 3 ° C. or less.
  • the transparent film may be formed into a long shape by connecting a plurality of rectangular transparent films formed by impregnating a transparent resin composition into a glass fiber base material and curing it. preferable.
  • the transparent film is formed into a long shape by press-molding a long glass fiber base material impregnated with a transparent resin composition by pressure molding with a double belt press. .
  • the transparent film is preferably wound into a roll.
  • the transparent film according to the present invention has uniform physical properties throughout the entire surface (particularly in the width direction).
  • FIG. 1A is a schematic front view showing a manufacturing process of a rectangular transparent film by a single-wafer press
  • FIG. 1B is a schematic perspective view showing a process of manufacturing a long transparent film by connecting the rectangular transparent film with a tape. It is. It is a schematic front view which shows the manufacturing process of the elongate transparent film by a double belt press. It is a schematic front view which shows the manufacturing process of the elongate transparent film by a lami roll.
  • the transparent film 1 can be formed by impregnating a glass fiber base material with a transparent resin composition containing an epoxy resin or the like and curing it.
  • the transparent film 1 is a transparent composite sheet in which a transparent resin composition is held on a glass fiber substrate.
  • a high refractive index resin having a refractive index larger than that of glass fibers A glass fiber base material is impregnated with a transparent resin composition prepared by mixing with a low refractive index resin having a refractive index smaller than that of glass fiber so that the refractive index approximates that of glass fiber. Can be formed.
  • Examples of the substituent of R 1 and R 3 to R 10 in formula (I) include a hydrogen atom, a hydrocarbon group such as a lower alkyl group, and other monovalent organic groups, and the substituent of R 2 Examples thereof include a divalent organic group.
  • cyanate ester resins examples include 2,2-bis (4-cyanatephenyl) propane, bis (3,5-dimethyl-4-cyanatephenyl) methane, 2,2-bis (4-cyanatephenyl) ethane, and the like. Or an aromatic cyanate ester compound can be used. These may be used alone or in combination of two or more.
  • the cyanate ester resin generates a triazine ring and an oxazoline ring by causing a curing reaction together with the epoxy resin, increases the crosslink density of the epoxy resin, and forms a rigid structure to give a cured product a high glass transition temperature (Tg). Can be granted.
  • Tg glass transition temperature
  • the cyanate ester resin is solid at room temperature, it is easy to dry by touch when preparing the prepreg 4 by impregnating the glass fiber base material with a transparent resin composition and drying as described below. Thus, the handleability of the prepreg 4 is improved.
  • the blending amount is preferably 10 to 40% by mass, more preferably 25 to 35% by mass with respect to the total amount of the high refractive index resin and the low refractive index resin. is there.
  • the blending amount is 10% by mass or more, the glass transition temperature (Tg) can be sufficiently improved.
  • the solubility is good and the cyanate ester resin is in the impregnation step or during storage. It is possible to suppress precipitation from the varnish.
  • the glass transition temperature (Tg) is high and the heat resistance of the cured product is enhanced while maintaining high transparency. Further, discoloration due to heat can be suppressed.
  • Examples of the divalent organic group represented by R 2 in the formula (I) include a substituted or unsubstituted arylene group such as a phenylene group, or a structure in which a substituted or unsubstituted arylene group is bonded to a carbon atom or a carbon chain. Groups and the like.
  • Examples of the carbon atom or carbon chain include alkylene groups such as a methylmethylene group and a dimethylmethylene group, and a carbonyl group.
  • a group in which a phenylene group is bonded to the glycidyloxy group on the right side of the formula (I) to form a glycidyloxyphenyl group is preferably used. Further, from the viewpoint of suppressing discoloration of the transparent film due to heat, those in which the carbon atom or carbon chain interposed between the arylene groups does not contain a methylene group (—CH 2 —) are preferably used.
  • Examples of the divalent organic group represented by R 2 include the following structures (inside square brackets).
  • Examples of the epoxy group-containing molecular chain of R 3 to R 10 in formula (I) include the following structures (inside square brackets).
  • polyfunctional epoxy resin having three or more functions represented by the formula (I) for example, polyfunctional epoxy resins represented by the following formulas (Ia), (Ib), and (Ic) can be used.
  • the high refractive index resin it is preferable to use a trifunctional epoxy resin represented by the above formula (I-a).
  • Tg glass transition temperature
  • the heat resistance of the cured product is maintained while maintaining high transparency as compared with the case of using a trifunctional or higher polyfunctional epoxy resin represented by other formula (I). Further, discoloration due to heat can be suppressed.
  • the refractive index of the cyanate ester resin, the trifunctional or higher polyfunctional epoxy resin represented by the formula (I), or a mixture thereof as the high refractive index resin is preferably 1.58 to 1.63.
  • the high refractive index resin preferably has a refractive index of around 1.6. If the refractive index of the glass fiber is n, n + 0.03 to Those in the range of n + 0.06 are preferred.
  • the high refractive index resin preferably has a refractive index of around 1.5, and when the refractive index of the glass fiber is n, n + 0.03 to Those in the range of n + 0.08 are preferred.
  • the refractive index of the resin means the refractive index in the cured resin state (cured resin), and is a value tested according to ASTM D542.
  • an epoxy resin can be used as the low refractive index resin blended in the transparent resin composition.
  • a polyfunctional epoxy resin having a structure represented by the following formula (II) is preferably used.
  • Such a polyfunctional epoxy resin is alicyclic and highly transparent, has a high glass transition temperature (Tg), and can improve the heat resistance of the cured product.
  • the organic group R may be arbitrary as long as it does not impair the effects of the present invention based on the alicyclic epoxy structure in the square brackets.
  • Examples include branched hydrocarbon groups.
  • M in the formula (II) is not particularly limited, but is, for example, 1 to 5, and n is not particularly limited, but is preferably in a range that loses fluidity at normal temperature (25 ° C.) and becomes a solid. Production of the transparent film 1 can be facilitated by being solid at room temperature.
  • polyfunctional epoxy resin having a structure represented by the formula (II) for example, 1,2-epoxy-4- (2-oxiranyl) cyclohexane is added to 2,2-bis (hydroxymethyl) -1-butanol What is obtained can be used. Specifically, for example, those represented by the following formula (II-a) can be used.
  • This polyfunctional epoxy resin has a melting point of about 85 ° C., for example, and the molecular weight is not particularly limited, but is about 2000 to 3000, for example.
  • a hydrogenated bisphenol type epoxy resin can be used as the low refractive index resin.
  • the hydrogenated bisphenol type epoxy resin for example, bisphenol A type, bisphenol F type, bisphenol S type and the like can be used.
  • a hydrogenated bisphenol type epoxy resin that is solid at room temperature is used.
  • a hydrogenated bisphenol-type epoxy resin that is liquid at room temperature can be used, but when the prepreg 4 is produced by impregnating a glass fiber base material with a transparent resin composition and drying it, it is in a state where it is sticky to the touch. In many cases, the prepreg 4 can be dried only to the extent that it is difficult to handle.
  • the refractive index of the low refractive index resin is preferably 1.47 to 1.53.
  • the low-refractive index resin preferably has a refractive index of around 1.5, where n ⁇ . A range of 04 to n-0.08 is preferable.
  • the refractive index of the glass fiber is 1.528 (T glass)
  • the refractive index of the low refractive index resin is in the range of n-0.01 to n-0.03, where n is the refractive index of the glass fiber. Those are preferred.
  • the glass transition temperature (Tg) after curing of the transparent resin composition is preferably 200 ° C. or higher, more preferably 210 ° C. or higher, and most preferably 230 ° C. or higher.
  • the upper limit of the glass transition temperature (Tg) is not particularly limited, but practically about 350 ° C. is the upper limit.
  • the glass transition temperature (Tg) is a value measured according to JIS C6481 TMA method.
  • a curing initiator (curing agent) can be blended in the transparent resin composition.
  • an organic metal salt or the like can be used as the curing initiator.
  • the organic metal salts include salts of organic acids such as octanoic acid, stearic acid, acetylacetonate, naphthenic acid, and salicylic acid with metals such as Zn, Cu, and Fe. These may be used alone or in combination of two or more.
  • Tg glass transition temperature of the cured resin can be increased by using an organometallic salt as the curing initiator.
  • zinc octoate is preferably used as the curing initiator.
  • the glass transition temperature (Tg) of the cured resin can be further increased as compared with the case of using other organic metal salts.
  • the compounding amount of the organic metal salt in the transparent resin composition is preferably in the range of 0.01 to 0.1 PHR.
  • a cationic curing initiator can be used as the curing initiator.
  • the cationic curing initiator include aromatic sulfonium salts, aromatic iodonium salts, aromatic ammonium salts, aluminum chelates, and boron trifluoride amine complexes.
  • the transparency of the cured resin can be enhanced by using a cationic curing initiator as the curing initiator.
  • the blending amount of the cationic curing initiator in the transparent resin composition is preferably in the range of 0.2 to 3.0 PHR.
  • a curing catalyst such as a tertiary amine such as triethylamine or triethanolamine, 2-ethyl-4-imidazole, 4-methylimidazole or 2-ethyl-4-methylimidazole can also be used as a curing initiator.
  • the blending amount of these curing catalysts in the transparent resin composition is preferably in the range of 0.5 to 5.0 PHR.
  • the transparent resin composition can be prepared by blending a high refractive index resin, a low refractive index resin, and a curing initiator as necessary.
  • This transparent resin composition can be prepared as a varnish by diluting with a solvent as necessary.
  • the solvent include benzene, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, acetone, methanol, ethanol, isopropyl alcohol, 2-butanol, ethyl acetate, butyl acetate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diacetone.
  • Alcohol, N, N′-dimethylacetamide and the like can be mentioned.
  • the glass fiber is surface-treated with a silane coupling agent that is usually used as a glass fiber treating agent for the purpose of improving impact resistance.
  • the refractive index of the glass fiber is preferably 1.55 to 1.57, more preferably 1.555 to 1.565.
  • the refractive index of the high refractive index resin after curing is preferably 1.58 to 1.63
  • the refractive index of the low refractive index resin after curing is preferably 1.47 to 1.53. If the refractive index of glass fiber, high refractive index resin, and low refractive index resin is said range, the transparent film excellent in visibility can be obtained at low cost.
  • the refractive index of the glass fiber is 1.50 to 1.53, the refractive index of the high refractive index resin after curing is 1.54 to 1.63, and the refractive index of the low refractive index resin after curing is 1.47 to glass. It is also preferable that the refractive index of the fiber. In this case, the transparent film 1 having lower retardation and excellent visibility can be obtained.
  • the glass fiber substrate a glass fiber woven fabric or non-woven fabric can be used.
  • the prepreg 4 can be produced by impregnating the glass fiber base material with the varnish of the transparent resin composition, heating and drying.
  • the drying conditions are not particularly limited, but a drying temperature of 100 to 160 ° C. and a drying time of 1 to 10 minutes are preferable.
  • the prepreg 4 is usually produced in a long shape by impregnating a long glass fiber base material with a varnish of a transparent resin composition, heating and drying, and such a long prepreg is prepared. From the viewpoint of handleability such as storage and transportation, 4b is preferably wound, for example, in a roll shape with the columnar core 5 as a core.
  • the transparent resin composition can be cured to obtain the transparent film 1 by stacking one or a plurality of the prepregs 4 and heating and pressing.
  • the conditions for the heat and pressure molding are not particularly limited, but a temperature of 150 to 200 ° C., a pressure of 1 to 4 MPa, and a time of 10 to 120 minutes are preferable.
  • the long (strip-shaped) transparent film 1 can be manufactured as follows.
  • the width of the transparent film 1 is preferably 500 to 3000 mm, and more preferably 600 to 1300 mm.
  • one rectangular prepreg 4a or a stack of a plurality of rectangular prepregs 4a is made into one set, and a pair of mirror plates 6 such as a stainless steel plate is interposed between each pair.
  • a plurality of sets of rectangular transparent films 1a are obtained at a time by setting a plurality of sets on a single-wafer press 8 comprising the hot plate 7 and then heat-press molding.
  • the prepreg 4 is usually produced in a long shape by impregnating a long glass fiber base material with a varnish of a transparent resin composition and drying by heating, but this is cut into a rectangular shape.
  • the rectangular shape includes a square as well as a rectangle.
  • a long transparent film 1 can be obtained by connecting a plurality of rectangular transparent films 1 a with a tape 2 such as a polyimide tape.
  • a tape 2 such as a polyimide tape.
  • Each rectangular transparent film 1a constituting the long transparent film 1 is not formed by receiving a linear pressure between a pair of rolls 15 of a conventional lami roll 16 as shown in FIG. Since it is formed by receiving the surface pressure between the pair of hot plates 7 of the sheet-fed press 8 as described above, it has uniform physical properties without variations in physical properties such as retardation in the entire surface (particularly in the width direction). It is what.
  • the long transparent film 1 thus obtained is preferably wound in a roll shape with a cylindrical core 9 as a core, for example.
  • Such a roll-shaped transparent film 1 is excellent in handling properties such as storage and transportation, and when considering subsequent steps such as film formation of a conductive film such as an ITO film and formation of a resin layer such as a hard coat layer. Since it is formed in a long shape in advance and wound in a roll shape, it is excellent in terms of workability and cost.
  • the long (strip-shaped) transparent film 1 can be manufactured as follows using a double belt press 3 as shown in FIG.
  • the double belt press 3 includes a stainless steel endless belt 12 hung between the upper inlet roll 10a and the outlet roll 11a, and a stainless steel endless belt hung between the lower inlet roll 10b and the outlet roll 11b. 13 is formed in close contact.
  • the speed of the endless belts 12 and 13 can be set to 0.1 to 10 m / min, but is not limited to this.
  • 14 is a guide roll.
  • a single long prepreg 4b or a plurality of long prepregs 4b are stacked, and this is heated and pressure-molded by a double belt press 3 and cured to form a transparent film 1 formed into a long shape.
  • a double belt press 3 heated and pressure-molded by a double belt press 3 and cured to form a transparent film 1 formed into a long shape.
  • two long prepregs 4b are fed in the longitudinal direction, and are inserted as they are between the upper and lower inlet rolls 10a and 10b of the double belt press 3, so that two long prepregs 4b are inserted.
  • the upper transparent prepreg 4b is superposed and fed by the upper and lower endless belts 12 and 13 to be cured, and then drawn out from between the upper and lower outlet rolls 11a and 11b, whereby the long transparent film 1 is continuously formed.
  • the post-cure (after-cure) conditions can be set to, for example, 100 to 300 ° C. and 5 to 300 minutes.
  • the long transparent film 1 obtained as described above is not formed by receiving the linear pressure between the pair of rolls 15 of the conventional lami roll 16 as shown in FIG. 3, but as shown in FIG. Since it is formed by receiving the surface pressure between the pair of endless belts 12 and 13 of the double belt press 3, it has uniform physical properties without variations in physical properties such as retardation in the entire surface (especially in the width direction). It is what.
  • the long transparent film 1 thus obtained is preferably wound in a roll shape with a cylindrical core 9 as a core, for example.
  • Such a roll-shaped transparent film 1 is excellent in handling properties such as storage and transportation, and when considering subsequent steps such as film formation of a conductive film such as an ITO film and formation of a resin layer such as a hard coat layer. Since it is formed in a long shape in advance and wound in a roll shape, it is excellent in terms of workability and cost.
  • the difference in retardation between the central portion in the width direction of the transparent film and the location 250 mm away from the central portion in the width direction is 0.2 nm or less (the lower limit is 0 nm). It is.
  • the retardation can be measured using a birefringence measuring apparatus such as “Birefringence Imaging System Abrio” manufactured by Tokyo Instruments Inc., for example.
  • said transparent film 1 has a uniform physical property (birefringence) in the whole in-plane (especially width direction).
  • the average retardation value of the entire transparent film 1 is preferably less than 1.4 nm, and more preferably 1.3 nm or less (the lower limit is not particularly limited, but 0.1 nm). Thereby, the birefringence of the whole transparent film 1 can be reduced, and it can be used suitably for a liquid crystal display etc.
  • the resin matrix formed by polymerizing the high refractive index resin and the low refractive index resin has a high glass transition temperature (Tg), and the transparent film 1 having excellent heat resistance. Can be obtained. And especially in said transparent film 1, the difference of the glass transition temperature (Tg) of the center part in the width direction of a transparent film and the location 250 mm away from this center part in the width direction is 3 degrees C or less (a minimum is 0 degreeC). ) Is preferable. Thereby, this transparent film 1 has a uniform physical property (heat resistance).
  • the high refractive index resin and the low refractive index resin as exemplified above are excellent in transparency, and the transparent film 1 that ensures high transparency can be obtained.
  • the content of the glass fiber substrate is preferably in the range of 25 to 65% by mass, more preferably in the range of 35 to 60% by mass. If it is this range, while being able to acquire high impact resistance with the reinforcement effect by glass fiber, sufficient transparency can be acquired.
  • corrugation will become large and transparency will also fall.
  • the thermal expansion coefficient of the transparent film 1 may become large.
  • a plurality of thin glass fiber substrates can be used in order to obtain high transparency.
  • a glass fiber substrate having a thickness of 50 ⁇ m or less can be used, and two or more of them can be used in an overlapping manner.
  • the thickness of the glass fiber substrate is not particularly limited, but about 10 ⁇ m is a practical lower limit.
  • the number of glass fiber substrates is not particularly limited, but about 20 is the practical upper limit.
  • the transparent film 1 when manufacturing the transparent film 1 using the base material of a some glass fiber, the transparent resin composition is impregnated in each glass fiber base material, it dries, and the prepreg 4 is produced,
  • the transparent film 1 can be obtained by stacking a plurality of sheets by heating and pressing, but impregnating and drying the transparent resin composition in a state in which a plurality of glass fiber substrates are stacked to produce a prepreg 4.
  • the prepreg 4 may be heat-pressed to obtain the transparent film 1.
  • the average value of the thickness of the transparent film 1 thus obtained is preferably 30 to 200 ⁇ m.
  • the difference of the thickness of the center part in the width direction of a transparent film and the location 250 mm away from this center part in the width direction is 1 micrometer or less (0.5 micrometer or less ( The lower limit is preferably 0 ⁇ m. Thereby, this transparent film 1 has a uniform physical property (thickness).
  • the transparent film 1 of the present invention has high dimensional stability, and particularly has a low coefficient of thermal expansion (CTE) in the plane direction (XY direction).
  • CTE coefficient of thermal expansion
  • the coefficient of thermal expansion in the plane direction at 50 to 150 ° C. can be set to 30 ppm / ° C. or less.
  • the surface of the transparent film 1 of the present invention is smooth, and for example, the surface roughness (Rz) can be 1 ⁇ m or less.
  • a hard coat layer can be provided on at least one side of the transparent film 1 of the present invention.
  • a configuration known as a hard coat layer such as a conventional plastic film can be applied.
  • an epoxy resin layer of several ⁇ m is formed on the surface of the transparent film 1 by a laminate transfer method.
  • a hard coat layer having a smooth surface can be obtained. Specifically, first, a high molecular weight epoxy resin dissolved in a solvent is applied to a PET film or the like as a carrier film. Next, this film is laminated on the surface of the transparent film 1 using a vacuum laminator. Thereafter, the epoxy resin is cured by ultraviolet irradiation or heat treatment, and finally the carrier film is removed to obtain a smooth hard coat layer.
  • a gas barrier layer can be provided on at least one surface of the transparent film 1 of the present invention.
  • a thin film of SiO 2 or SiON X is formed on the surface of the transparent film 1 by sputtering or the like, or these inorganic thin films and an organic resin film such as an acrylic resin, an epoxy resin, or a mixture thereof are laminated.
  • an organic resin film such as an acrylic resin, an epoxy resin, or a mixture thereof are laminated.
  • Curing initiator-Zinc octanoate The above high refractive index resin and low refractive index resin are blended in the amounts (parts by mass) shown in Table 1, further blended with a curing initiator, and 50 parts by mass of toluene as a solvent and By adding 50 parts by mass of methyl ethyl ketone and stirring and dissolving at a temperature of 70 ° C., a varnish of the transparent resin composition was prepared.
  • a glass cloth having a thickness of 25 ⁇ m (manufactured by Asahi Kasei Electronics Co., Ltd., product number “1035”, E glass fiber, refractive index 1.563) is impregnated with the varnish of the transparent resin composition described above, and at 150 ° C. for 5 minutes. By heating, the solvent was removed and the resin was semi-cured to prepare prepreg 4.
  • Example 1 For Example 1, first, as shown in FIG. 1A, a pair of two rectangular prepregs 4a (600 mm ⁇ 600 mm) are stacked, and a stainless steel plate is interposed between each set as a mirror plate 6. Then, after 100 sets are set in a single-wafer press 8 composed of a pair of hot plates 7, a rectangular transparent film 1a (600 mm ⁇ 600 mm) is formed by heating and pressing under conditions of a temperature of 170 ° C., a pressure of 2 MPa, and a time of 15 minutes. ) Was obtained 100 at a time. Next, as shown in FIG. 1A, a pair of two rectangular prepregs 4a (600 mm ⁇ 600 mm) are stacked, and a stainless steel plate is interposed between each set as a mirror plate 6. Then, after 100 sets are set in a single-wafer press 8 composed of a pair of hot plates 7, a rectangular transparent film 1a (600 mm ⁇ 600 mm) is formed by heating and pressing under
  • a transparent film 1 (width 600 mm, average thickness 70 ⁇ m) formed into a long shape is obtained. Obtained. Further, the long transparent film 1 was wound into a roll with the columnar core 9 as a core to obtain a roll-shaped transparent film 1.
  • Example 2 a roll-shaped transparent film 1 was obtained in the same manner as in Example 1 except that a rectangular prepreg 4a having a size of 1300 mm ⁇ 1100 mm was used.
  • Example 3 As shown in FIG. 2, two long prepregs 4b (width: 600 mm) are stacked, and this is double-pressed 3 (manufactured by Held (Germany)) at a temperature of 170 ° C. and pressure
  • a transparent film 1 (width) formed into a long shape by performing post-cure treatment under conditions of a temperature of 170 ° C. and a time of 15 minutes after being cured by heating and pressing under conditions of 2 MPa and a speed of 1 m / min. 600 mm, average thickness 70 ⁇ m). Further, the long transparent film 1 was wound into a roll with the columnar core 9 as a core to obtain a roll-shaped transparent film 1.
  • the thickness of the central portion and the end portion (location 250 mm away from the central portion in the width direction) of the long transparent film 1 was measured by the method of 3.3 of JIS C6481. Furthermore, the average value of the thickness of the whole transparent film 1 was also calculated.
  • Glass transition temperature (Tg) Scraping off the resin at the center and end (250 mm away from the center in the width direction) of the long prepreg 4 respectively, A resin plate was produced by pressure molding. And each glass plate was used as a test sample, and the glass transition temperature (Tg) was measured according to JIS C6481 TMA method.
  • Table 1 shows the results of these measurements and evaluations.

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Abstract

L'invention concerne un film transparent doté de propriétés de matériau uniforme sur toute la surface. Ledit film transparent est formé par imprégnation d'un substrat en fibre de verre avec une composition de résine transparente, suivie de cuisson. La différence de retard entre la section centrale qui se présente dans le sens de la largeur du film transparent et qui est au moins de 500 mm de la largeur du film transparent et distant de 250 mm de la section centrale dans le sens de la largeur n'excède par 0,2 nm.
PCT/JP2011/074405 2010-10-25 2011-10-24 Film transparent Ceased WO2012057061A1 (fr)

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JPS63122507A (ja) * 1986-11-13 1988-05-26 Matsushita Electric Works Ltd 積層板の連続製造法
JP2003290697A (ja) * 2002-04-02 2003-10-14 Toppan Printing Co Ltd 単板連続塗布装置
JP2008231386A (ja) * 2007-02-22 2008-10-02 Tosoh Corp 透明フィルム
JP2010235933A (ja) * 2009-03-09 2010-10-21 Panasonic Electric Works Co Ltd 透明フィルム

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS63122507A (ja) * 1986-11-13 1988-05-26 Matsushita Electric Works Ltd 積層板の連続製造法
JP2003290697A (ja) * 2002-04-02 2003-10-14 Toppan Printing Co Ltd 単板連続塗布装置
JP2008231386A (ja) * 2007-02-22 2008-10-02 Tosoh Corp 透明フィルム
JP2010235933A (ja) * 2009-03-09 2010-10-21 Panasonic Electric Works Co Ltd 透明フィルム

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Title
KIKAN KAGAKU SOSETSU TOMEI POLYMER NO KUSSETSURITSU SEIGYO, 10 November 1998 (1998-11-10), pages 165 - 173 *

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