JPH0721112B2 - Awning sheet - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an awning sheet (or film), and more particularly to a awning sheet useful for a pool house cover, a baby carriage cover, a parasol or the like.

(Prior Art and Problems Thereof) Colored thermoplastic resin sheets, woven fabrics, and the like have been widely used as the various sunshades and sunshades described above.

Such an awning sheet is not uniform depending on its intended use, but it is of course required to be waterproof in, for example, a poolside cover, a parasol at a beach, and other applications, but it is covered. It is preferable to allow some sunlight to pass through so that the part does not become too dark.

However, since it does not serve the purpose of a sunshade because it completely transmits sunlight, it is desired to block only harmful ultraviolet rays of sunlight and transmit only light having a useful wavelength.

Usually, sunlight contains light rays of various wavelengths, and since ultraviolet rays are high-energy rays called turning rays, skin is inflamed when exposed to excessive irradiation.

On the other hand, ultraviolet rays and visible rays having a wavelength of more than 320 nm are called burning rays, and it is known that skin can be beautifully burned without causing inflammation.

Therefore, as a sunshade sheet in places with strong ultraviolet rays, such as poolsides and beaches, a wavelength of 280-3
Blocks 20nm ultraviolet light, but other light, that is, wavelength
There is a demand for an awning sheet that allows transmission of ultraviolet rays and visible rays exceeding 320 nm.

As a method for responding to the above demands, a method of incorporating a dye that blocks a specific light in the sunshade sheet is considered, but these methods are considerably high in order to sufficiently block harmful ultraviolet rays. It is necessary to color it in a high density, and as a result, it blocks useful UV rays and visible rays at the same time, which causes a drawback that the portion covered with the sheet becomes dark.

The present inventor has conducted intensive studies to solve the above-mentioned drawbacks and obtain a sunshade sheet that sufficiently blocks harmful ultraviolet rays and sufficiently transmits useful ultraviolet rays and visible rays. The present invention has been completed by finding that the object of the present invention can be sufficiently achieved by including an ultraviolet absorber and a specific colorant.

(Means for Solving the Problems) That is, the present invention is to use an ultraviolet absorbent of 0.01 to 5 weight% represented by the following general formula, which absorbs ultraviolet rays having a wavelength of 280 to 320 nm and transmits ultraviolet rays having a wavelength of 320 nm and visible rays. Part and at least one pigment selected from the group consisting of dioxazine violet, copper phthalocyanine green, copper phthalocyanine blue and isoindolinone yellow 0.001 to 0.1
A sunshade sheet obtained by molding a composition comprising a thermoplastic resin in an amount of 100 parts by weight and 100 parts by weight as a whole.

(R is a hydrogen atom or an alkyl group.) (Preferred embodiment) Next, the present invention will be described in more detail with reference to preferred embodiments.

The ultraviolet absorber used in the present invention and mainly characterizing the present invention is an organic compound which absorbs ultraviolet rays having a wavelength of 280 to 320 nm and transmits ultraviolet rays and visible rays having a wavelength of more than 320 nm, which are detailed by the present inventor. Studies have revealed that the compound represented by the general formula (I) is useful as a preferred specific example having such specific performance.

Particularly preferred compounds are those in which R is a hydrogen atom or R
Is a tertiary butyl group or a mixture thereof.

All of the above specific ultraviolet absorbers are known as such, and can be easily obtained from the market and used in the present invention.

The amount of such an ultraviolet absorbent used in the present invention is 0.01 to 20 parts by weight, preferably 0.01 to 20 parts by weight of the ultraviolet absorbent in relation to the thermoplastic resin for forming the awning sheet.
The amount of the thermoplastic resin is 99.99 to 80 parts by weight, preferably 99.99 to 95 parts by weight, based on 5 parts by weight.

If the proportion of the ultraviolet absorber used is less than the above range, the object of the present invention will be insufficiently achieved. On the other hand, if the proportion exceeds the above range, the effect will not be improved relative to the amount used and it will be uneconomical.

In the present invention, it was found that the effect of the present invention is further improved by using a specific organic pigment in a specific ratio.

That is, among many organic pigments, by using dioxazine violet, copper phthalocyanine blue or green and isoindolinone yellow pigment in combination with the specific ultraviolet absorber, ultraviolet rays having a wavelength of 280 to 320 nm are more efficiently. Be cut off.

However, when such an organic pigment is used in a large amount, it is not preferable because useful ultraviolet rays, that is, ultraviolet rays and visible rays having a wavelength of 320 nm or more are also transmitted, which is not preferable in the present invention. It is desirable to use it in the range of 0.1% by weight.

As the thermoplastic resin used in the present invention, any conventionally known thermoplastic resin such as polyethylene, polypropylene, polystyrene, polyester, polyamide, polycarbonate, polyurethane, or polyvinyl chloride resin can be used.

The thermoplastic resin composition used to form a sheet in the present invention contains the ultraviolet absorber as described above, a specific organic pigment and a thermoplastic resin as essential components, and an ultraviolet absorber, an organic pigment and a thermoplastic resin. In the range of a relatively low concentration of the ultraviolet absorber, for example, in the range of 0.01 to 5 parts by weight of the ultraviolet absorber and 0.001 to 0.1 parts by weight of the organic pigment, various molded products as they are, for example, a sunshade sheet Or in the range of relatively high concentration of the ultraviolet absorber and the organic pigment, for example, in the range of 5 to 20 parts by weight of the ultraviolet absorber and 0.1 to 1.0 parts by weight of the organic pigment. It is preferable to use it as a so-called master batch, which is used by diluting by adding a thermoplastic resin containing no ultraviolet absorber and organic pigment at the time of molding.

The thermoplastic resin composition used in the present invention may contain components other than those described above, and examples thereof include colorants other than the above, stabilizers, antistatic agents, plasticizers, lubricants, dispersants for colorants, and the like. Additives can be included within a range that does not impair the object of the present invention.

The thermoplastic resin composition composed of the above components can be obtained by simply mixing the essential components, or may be one in which the essential components are once melt-kneaded and granulated into pellets. When a soft polyvinyl chloride resin is used as the thermoplastic resin, it may be in the form of paste sol or organosol, so-called paint type. Further, when the thermoplastic resin is a conventional paint type thermoplastic resin such as an acrylic emulsion, a polyvinyl acetate emulsion, a urethane emulsion, or a solution type of these resins in an organic solvent, such a paint type is used. But it's okay.

The awning sheet of the present invention is obtained by molding the above thermoplastic resin composition into a sheet by any molding method. The molding method may be any of extrusion molding, inflation molding, calender molding, etc. In the case of a paint type, it is applied on a suitable base material sheet, gelled or dried to be molded, and peeled off. The awning sheet of the present invention can be used as it is without peeling or peeling.

In the case of peeling, it is preferable to use a release paper as a base sheet, and in the case of not peeling, processed paper having a certain degree of translucency, general plastic sheet or film, woven cloth, non-woven cloth, etc. Any substrate sheet may be used.

The awning sheet of the present invention is obtained as described above, but its thickness is preferably about 0.2 to 0.5 mm, and a thickness less than this range causes problems such as strength, while too thick, flexibility and the like. It is preferable because it lacks. However, the thickness may be out of the above range depending on the application. Further, in the case of a relatively thin sheet within the above range, the amount of the aforementioned ultraviolet absorber is relatively large, for example, 1 to 5 parts by weight is good,
In the case of a relatively thick sheet, the amount of UV absorber is
About 0.01 to 1 part by weight is suitable.

(Operation / Effect) The awning sheet of the present invention obtained as described above, for example, when used in a season of strong ultraviolet rays such as spring to summer, is harmful to ultraviolet rays in the sunlight, that is, ultraviolet rays having a wavelength of 280 to 320 nm. Useful UV rays that can block most of the light and beautifully tan without causing skin irritation, namely a wavelength of 320n
Since ultraviolet rays and visible rays exceeding m can be sufficiently transmitted, the awning sheet of the present invention enables sufficiently bright and healthy sunburn.

(Examples) Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In addition, unless otherwise specified, "parts" and "%" in the text are based on weight.

Example 1 The following ingredients were mixed and calendered to a thickness of 0.
When a 2 mm sheet was formed and the sunlight transmittance thereof was measured, it was as shown by the curve A in FIG.

Polyvinyl chloride (polymerization degree 1,100) 64.5 parts Dioctyl phthalate 30.3 parts Epoxidized soybean oil 3.2 parts Mark AC-169 (Ba-Zn stabilizer, made by ADEKA ARGUS)
1.3 parts Mark 1500 (special phosphite stabilizer, manufactured by ADEKA ARGUS) 0.7 parts Organic pigment (dioxazine violet) 0.01 parts Compound in which R is a hydrogen atom in the above general formula 0.2 parts Example 2 The following components are mixed, Thickness is 0 depending on calendering method.
When a 2 mm sheet was formed and the sunlight transmittance thereof was measured, it was as shown by the curve A in FIG.

Polyvinyl chloride (polymerization degree 1,100) 64.5 parts Dioctyl phthalate 30.3 parts Epoxidized soybean oil 3.2 parts Mark AC-169 (Ba-Zn stabilizer, made by ADEKA ARGUS)
1.3 parts Mark 1500 (special phosphite stabilizer, manufactured by ADEKA ARGUS) 0.7 parts Organic pigment (dioxazine violet) 0.01 parts Compound in which R is t-butyl group in the above general formula 0.2
Part Example 3 The following ingredients were mixed and calendered to a thickness of 0.
When a 2 mm sheet was formed and the sunlight transmittance thereof was measured, it was as shown by the curve A in FIG.

Polyvinyl chloride (polymerization degree 1,100) 64.5 parts Dioctyl phthalate 30.3 parts Epoxidized soybean oil 3.2 parts Mark AC-169 (Ba-Zn stabilizer, made by ADEKA ARGUS)
1.3 parts Mark 1500 (special phosphite stabilizer, manufactured by ADEKA ARGUS) 0.7 parts Organic pigment (cyanine blue) 0.01 parts Compound in which R is a hydrogen atom in the above general formula 0.2 parts Comparative Example 1 The following components are mixed and calendered. Thickness is 0 depending on the processing method.
When a 2 mm sheet was formed and the sunlight transmittance thereof was measured, it was as shown by the curve B in FIG.

Polyvinyl chloride (polymerization degree 1,100) 64.5 parts Dioctyl phthalate 30.3 parts Epoxidized soybean oil 3.2 parts Mark AC-169 (Ba-Zn stabilizer, made by ADEKA ARGUS)
1.3 parts Mark 1500 (special phosphite stabilizer, made by ADEKA ARGUS) 0.7 parts Comparative Example 2 The following components are mixed and calendered to a thickness of 0.
When a 2 mm sheet was formed and the sunlight transmittance thereof was measured, it was as shown by the curve B in FIG.

Polyvinyl chloride (polymerization degree 1,100) 64.5 parts Dioctyl phthalate 30.3 parts Epoxidized soybean oil 3.2 parts Mark AC-169 (Ba-Zn stabilizer, made by ADEKA ARGUS)
1.3 parts Mark 1500 (special phosphite stabilizer, made by ADEKA ARGUS) 0.7 parts Organic pigment (dioxazine violet) 0.01 parts Comparative Example 3 The following ingredients are mixed and calendered to a thickness of 0.
When a 2 mm sheet was formed and the sunlight transmittance thereof was measured, it was as shown by the curve B in FIG.

Polyvinyl chloride (polymerization degree 1,100) 64.5 parts Dioctyl phthalate 30.3 parts Epoxidized soybean oil 3.2 parts Mark AC-169 (Ba-Zn stabilizer, made by ADEKA ARGUS)
1.3 parts Mark 1500 (special phosphite stabilizer, made by ADEKA ARGUS) 0.7 parts Organic pigment (cyanine blue) 0.01 parts As described above, according to the present invention, the wavelength of sunlight is 280 to 320 nm.
It is possible to provide an awning sheet which can sufficiently block the ultraviolet rays of (3) and can sufficiently transmit the ultraviolet rays and visible rays having wavelengths exceeding 320 nm.

[Brief description of drawings]

FIG. 1 to FIG. 3 are graphs showing the sunlight transmittance of the awning sheets of Examples and Comparative Examples. A: present invention, B: comparative example

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsunori Nakanishi 2-529-3 Asahimoto-cho, Nara City, Nara Prefecture (56) References JP-A-60-127340 (JP, A)

Claims (1)

[Claims] 1. A wavelength of 32, which absorbs ultraviolet rays having a wavelength of 280 to 320 nm.
0.01 to 5 parts by weight of an ultraviolet absorber represented by the following general formula, which transmits ultraviolet rays and visible rays exceeding 0 nm, and at least one selected from the group consisting of dioxazine violet, copper phthalocyanine green, copper phthalocyanine blue and isoindolinone yellow. A sunshade sheet obtained by molding a composition comprising 0.001 to 0.1 part by weight of the pigment of 100 to 100 parts by weight of the thermoplastic resin. (R is a hydrogen atom or an alkyl group.)