DE1920464A1 - Poly (methylmethacrylate) rods - Google Patents
Poly (methylmethacrylate) rodsInfo
- Publication number
- DE1920464A1 DE1920464A1 DE19691920464 DE1920464A DE1920464A1 DE 1920464 A1 DE1920464 A1 DE 1920464A1 DE 19691920464 DE19691920464 DE 19691920464 DE 1920464 A DE1920464 A DE 1920464A DE 1920464 A1 DE1920464 A1 DE 1920464A1
- Authority
- DE
- Germany
- Prior art keywords
- rods
- cells
- polymerisation
- methylmethacrylate
- polymerization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920003229 poly(methyl methacrylate) Polymers 0.000 title claims abstract description 6
- 239000004926 polymethyl methacrylate Substances 0.000 title claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000003505 polymerization initiator Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 abstract description 6
- 239000004698 Polyethylene Substances 0.000 abstract description 4
- -1 polyethylene Polymers 0.000 abstract description 4
- 229920000573 polyethylene Polymers 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 210000004027 cell Anatomy 0.000 abstract 2
- 239000000592 Artificial Cell Substances 0.000 abstract 1
- 210000002421 cell wall Anatomy 0.000 abstract 1
- 239000003999 initiator Substances 0.000 abstract 1
- 239000010409 thin film Substances 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 229920000193 polymethacrylate Polymers 0.000 description 2
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- IFSWBZCGMGEHLE-UHFFFAOYSA-L cobalt(2+);naphthalene-2-carboxylate Chemical compound [Co+2].C1=CC=CC2=CC(C(=O)[O-])=CC=C21.C1=CC=CC2=CC(C(=O)[O-])=CC=C21 IFSWBZCGMGEHLE-UHFFFAOYSA-L 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/003—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor characterised by the choice of material
- B29C39/006—Monomers or prepolymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/02—Polymerisation in bulk
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/12—Esters of monohydric alcohols or phenols
- C08F20/14—Methyl esters, e.g. methyl (meth)acrylate
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
Verfahren' zur Herstellung von Stangen aus Polniethakrylsäuremethylest er Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Polymethylmethakrylatstangen. Process for the production of rods from poliethakrylic acid methyl ester The invention relates to a method for making polymethyl methacrylate rods.
Es ist ein Verfahren bekannt, mit welchem PolymeWhylmethakrylatstangen durch direktes Polymerisieren des Methylmethakrylats in Glasgefäßen erzeugt werden. Die Glasgefäße sind, obwohl sie mit elastischen Dichtungen versehen sind, zu starr, um leicht den volumetrischen Schrumpfungen des polFmerisierenden Methylmethakrylats zu folgen, was zu Mängeln in der Polymethylmethakrylatmasse führt.There is known a method by which polymer / methyl methacrylate rods by polymerizing the methyl methacrylate directly in glass vessels. The glass vessels, although they are provided with elastic seals, are too rigid, around slightly the volumetric shrinkage of polymerizing methyl methacrylate to follow, which leads to deficiencies in the polymethyl methacrylate composition.
Das erfindungsgemäße Verfahren beseitigt den erwähnten Nachteil dadurch, daß, um Strukturmängel, die oft in der Masse des Polymerisats auftreten, zu beseitigen, das Monomere im Verhältnis von 40 - 50 % und bei einer Temperatur von 80 - 90° a vorpolymerisiert und dann die endgültige PoLymerisation in Zellen aus Kunststoff geeigneter Porosität in Wasserbädern bei einer Temperatur von 18 - 20° C 48 Stunden lang durchgeführt wird, wofür an sich bekannte polymerisationsauslösende und regelnde Zusätze verwendet werden.The method according to the invention eliminates the disadvantage mentioned by that, in order to eliminate structural defects which often occur in the bulk of the polymer, the monomer in the ratio of 40-50% and at a temperature of 80-90 ° a prepolymerized and then final polymerization in plastic cells suitable porosity in water baths at a temperature of 18-20 ° C for 48 hours long carried out becomes what is known per se polymerization initiator and regulatory additives can be used.
Im folgenden wird das erfindungsgemäße Verfahren anhand eines, Ausführungsbeispiels näher erläutert: In einem 3 Ltr.-Glaskolben werden 1,2 1 Methylmethakrylat und 1 bis 2 g Perophor eingeführt und ca.-30 Minuten lang auf 900 C erwärmt. Unter diesen Bedingungen wird das Monomere im Verhältnis von ca. 40 bis 50 % polymerisiert. Dann wird das Gemisch auf 200 C abgekühlt .In the following, the method according to the invention is based on an exemplary embodiment explained in more detail: In a 3 liter glass flask, 1.2 liters of methyl methacrylate and 1 Introduced up to 2 g perophore and heated to 900 ° C. for about 30 minutes. Under these Conditions, the monomer is polymerized in a ratio of approx. 40 to 50%. then the mixture is cooled to 200.degree.
iir die Vollendung der Polymerisation, die in einer Zelle aus Polyäthylen oder Celluloseacetat bei einer Temperatur von ca.for the completion of the polymerization, which takes place in a cell made of polyethylene or cellulose acetate at a temperature of approx.
20° C durchgeführt wird, werden in die Nonomer-Polymermasse 2 bis 5 g Benzoylperoxid und 4 bis 5 ml Dimethyl-anilin als einführende Zusätze und 4 bis 5 g Kobaltnaphtenat als Polymerisationsregler eingetragen.20 ° C is carried out, are in the nonomer polymer composition 2 to 5 g of benzoyl peroxide and 4 to 5 ml of dimethyl aniline as introductory additives and 4 up to 5 g cobalt naphtenate registered as a polymerization regulator.
Die durch die Reaktion zwischen dem Benzoyiperoxid und dem Dimethyl-antlin erzeugte Wärme reicht für die weitere Polymerisierungsreaktion bei der Wassertemperatur des Wasserbade, in welches die Polymerisierungszelle eingeführt wurde, aus.The result of the reaction between the benzoyiperoxide and the dimethyl-antlin The heat generated is sufficient for the further polymerization reaction at the water temperature of the water bath into which the polymerization cell was introduced.
Um ein günstigeres Gleichgewicht zwischen dem Schwinden des Polymethakrylats und der Kontraktion der Masse der Polymerisierungszelle zu erzielen,-wird diese, im Gegensatz zu den üblichen Glaspaltten, aus Kunststoff ausgeführt, wie z.B. aus Polyäthylen, Celluloseacetat etc.To find a more favorable balance between the shrinkage of the polymethacrylate and the contraction of the mass of the polymerisation cell, -will this, In contrast to the usual glass slits, made of plastic, such as Polyethylene, Cellulose acetate etc.
Die Polyäthylenzellen, welche mit der passenden Porosität ausgestattet werden können, sind vorgezogen, so daß das Wasser aus dem Wasserbad durch den Unterdruck infolge der in der Polymethakrylatmasse entstandenen Schwindungen in die Polymerisationszelle eindringen kann.The polyethylene cells, which are equipped with the appropriate porosity are preferred so that the water from the water bath through the negative pressure as a result of the shrinkage in the polymethacrylate mass in the polymerization cell can penetrate.
Das in die Polymerisationszellen eingeführte Vorpolymerisat ist, wie oben erwähnt, bei einer Temperatur von 18 - 200 C im Verlauf von ca. 48 Stunden vollständig polymerisiert. Aufgrund des Wasserfilma, der sich zwischen den inneren Wänden der Zelle und den entstandenen Polymethylmethakrylatstangen ausbildet, können diese leicht aus den Polyeerisationszellen ausgezogen werden.The prepolymer introduced into the polymerization cells is like mentioned above, at a temperature of 18 - 200 C in the course of approx. 48 hours completely polymerized. Because of the film of water between the inner Walls of the cell and the resulting polymethyl methacrylate rods can these can easily be pulled out of the polymerization cells.
Das erfindungsgemäße Verfahren besitzt also den Vorteil, die Qualitätsmängel auszuschliessen, die in der Masse des Polymerisats auftreten, wenn die Polymerisation in Zellen mit Glaswänden erfolgt.The method according to the invention therefore has the advantage of eliminating quality defects exclude that occur in the bulk of the polymer when the polymerization takes place in cells with glass walls.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691920464 DE1920464A1 (en) | 1969-04-22 | 1969-04-22 | Poly (methylmethacrylate) rods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691920464 DE1920464A1 (en) | 1969-04-22 | 1969-04-22 | Poly (methylmethacrylate) rods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1920464A1 true DE1920464A1 (en) | 1970-11-12 |
Family
ID=5731960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19691920464 Pending DE1920464A1 (en) | 1969-04-22 | 1969-04-22 | Poly (methylmethacrylate) rods |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1920464A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2848906A1 (en) * | 1977-11-11 | 1979-05-17 | Asahi Chemical Ind | SOLVENT RESISTANT ACRYLIC RESINS AND METHOD FOR MANUFACTURING THEM |
| DE4336594A1 (en) * | 1993-10-27 | 1994-08-04 | Klaus Reiser | Expander and esp. exerciser for mouth chewing muscles |
-
1969
- 1969-04-22 DE DE19691920464 patent/DE1920464A1/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2848906A1 (en) * | 1977-11-11 | 1979-05-17 | Asahi Chemical Ind | SOLVENT RESISTANT ACRYLIC RESINS AND METHOD FOR MANUFACTURING THEM |
| DE4336594A1 (en) * | 1993-10-27 | 1994-08-04 | Klaus Reiser | Expander and esp. exerciser for mouth chewing muscles |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3023096C2 (en) | ||
| DE2839249A1 (en) | METHOD OF MANUFACTURING A SOFT CONTACT LENS AND OUTPUT SOLUTION FOR CARRYING OUT THE METHOD | |
| DE1078330B (en) | Process for preparing the polymers of perfluorovinylaethers | |
| DE2934352A1 (en) | METHOD FOR PRODUCING GLASS FIBER REINFORCED TRANSPARENT CAST BODIES | |
| DE904949C (en) | Process for the production of ethylene polymers | |
| DE3606904A1 (en) | PREPOLYMERIZATION OF DIETHYLENE GLYCOLBIS (ALLYL CARBONATE) CONTAINING MONOMER COMPOSITIONS | |
| DE2425712B2 (en) | Process for producing a copolymer | |
| DE1520759A1 (en) | Process for the production of high molecular weight polyesters from lactones | |
| DE1920464A1 (en) | Poly (methylmethacrylate) rods | |
| DE1745280A1 (en) | Process for the production of solid tetrafluoroethylene or chlorotrifluoroethylene copolymers | |
| DE2416353A1 (en) | HYDROPHILIC COPOLYMER OF N, N- (C DEEP 1C DEEP 2-ALKYL) ACRYLAMIDE | |
| DE2255999B2 (en) | Vinyl acetate-ethylene copolymer, process for its preparation and its use | |
| DE1569083A1 (en) | Process for making a methyl methacrylate syrup composition | |
| DE2943799C2 (en) | Process for the production of a translucent or opaque sheet from a styrene / methyl methacrylate block copolymer | |
| DE2364057A1 (en) | VINYL HALOGENIDE TERPOLYMER AND BULK POLYMERIZATION PROCESS FOR ITS MANUFACTURING | |
| US3609129A (en) | Method of polymerizing acrylonitrile in the presence of an alkali metal alcoholate of an {60 -hydroxyalkylamine | |
| DE69205316T2 (en) | Organic glass. | |
| DE1520825C3 (en) | Process for the production of ethylene-styrene copolymers | |
| DE2502682C2 (en) | Hydrophilic and water absorbable copolymer | |
| DE2340334A1 (en) | STABLE Aqueous EMULSIONS OF N-VINYLLACTAMEN | |
| DE69305358T2 (en) | METHOD FOR (CO) POLYMERIZING VINYL MONOMERS | |
| DE1092657B (en) | Process for the high pressure polymerization of ethylene | |
| DE1004380B (en) | Process for the polymerization of olefinic compounds | |
| DE1520160C (en) | Process for the production of polyvinyl alcohol | |
| DE2355098A1 (en) | THERMALLY STABLE VINYL CHLORIDE / PROPYLENE COPOLYMERS AVAILABLE IN REDUCED REACTION TIMES |