JPH11147301A - Polycarbonate laminated plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a laminate plate excellent in weatherability, light transmittance, and shielding properties by forming a weatherable resin layer on one side of a polycarbonate resin layer and embossing the other side. SOLUTION: A weatherable resin layer formed on one side of a polycarbonate resin layer is formed by laminating a film of an acrylic resin or a polycarbonate resin containing an ultraviolet absorbing agent in a high concentration on a polycarbonate resin layer or by coextruding these resins with a polycarbonate resin as a backing. In the embossing to be applied on the other side of the polycarbonate resin layer, the polycarbonate resin sheet extruded from an extruder is passed between a crimp roll and a flat roll of a pair so that the weatherable resin layer contacts the flat roll. To obtain good natural lighting properties, the depth of the crimp in embossing is preferably adjusted to be 30-70 micron.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate laminate having good weather resistance and having a light-collecting property and a blinding property (here, the laminate includes not only a plate but also a sheet).

[0002]

2. Description of the Related Art One side or both sides of a polycarbonate laminate is embossed because it is used as a blinder or because the appearance similar to frosted glass gives a sense of quality. Further, in order to provide weather resistance, a film made of an acrylic resin or a polycarbonate resin containing an ultraviolet absorber is laminated on the sun-irradiated surface side.

However, when the embossed surface is applied to the sun-irradiated surface as a roofing material, dust and dust easily accumulate on the embossed surface, which has an effect of impeding light transmission. When laminating a weather-resistant resin film on the embossed surface,
Since the embossing is crushed by the roll pressure at the time of lamination, the embossing effect is weaker than before the lamination of the film, and the diffused light transmittance required for blindfolding is reduced. When a polycarbonate resin layer to be embossed and a weather-resistant resin layer are laminated by co-extrusion, in order to obtain a blinding effect with this polycarbonate resin layer, the emboss depth must be 30 to 70 μm. As a result, the effect of weather resistance is weakened. It is uneconomical to increase the thickness of the weather-resistant resin layer in order to prevent a decrease in weather resistance.

[0004]

Accordingly, an object of the present invention is to provide a polycarbonate laminate having good weather resistance, excellent light transmittance, and excellent shielding.

[0005]

The polycarbonate laminate of the present invention is characterized in that a weather-resistant resin layer is provided on one side of a polycarbonate resin layer and embossed on the other side.

In this polycarbonate laminate, when the weather-resistant resin layer side is used as a sun-irradiated surface, the weather resistance is maintained well, dust accumulates on the embossed surface and impedes the transmission of light, Since the embossed depth of the embossed surface is not impaired during the molding process, the light shielding property is excellent while the light transmittance is excellent.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The polycarbonate laminate of the present invention is a plate or sheet having a thickness of 0.1 to 10 mm.
Here, the polycarbonate resin used as the base layer is a polymer obtained by a phosgene method of reacting various dihydroxydiaryl compounds with phosgene, or a transesterification method of reacting a dihydroxydiaryl compound with a carbonate such as diphenyl carbonate. Yes, as a typical example, it can be produced from 2,2-bis (4-hydroxyphenyl) propane (bisphenol A).

The above dihydroxydiaryl compounds include bisphenol A, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, and 2,2-bis (4-hydroxyphenyl) octane. , Bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3)
-Methylphenyl) propane, 1,1-bis (4-hydroxy-3-tert-butylphenyl) propane, 2,2-
Bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-
Bis (hydroxyaryl) alkanes such as 3,5-dichlorophenyl) propane; 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4
Bis (hydroxyaryl) cycloalkanes such as -hydroxyphenyl) cyclohexane; 4,4'-
Dihydroxy diaryl ethers such as dihydroxy diphenyl ether and 4,4'-dihydroxy-3,3'-dimethyl diphenyl ether; dihydroxy diaryl sulfides such as 4,4'-dihydroxy diphenyl sulfide; 4,4'-dihydroxy diphenyl sulfoxide; 4,4'-dihydroxy-3,3'-
Dihydroxydiarylsulfoxides such as dimethyldiphenylsulfoxide; 4,4′-dihydroxydiphenylsulfone, 4,4′-dihydroxy-3,3 ′
And dihydroxydiarylsulfones such as dimethyldiphenylsulfone, and these are used alone or in combination of two or more.

In addition to these, piperazine, dipiperidyl hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl and the like may be used as a mixture. Further, the above-mentioned dihydroxydiaryl compound may be used as a mixture of the following trivalent or higher phenol compounds. That is,
This includes phloroglucin, 4,6-dimethyl-2,4,
6-tri (4-hydroxyphenyl) heptene, 2,
4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptane, 1,3,5-tri (4-hydroxyphenyl) benzol, 1,1,1-tri (4-hydroxyphenyl) Phenyl) ethane and 2,2-bis [4,4-
(4,4′-dihydroxydiphenyl) cyclohexyl] propane.

[0010] If necessary, an antistatic agent, a processing aid, an antioxidant, an ultraviolet absorber, a coloring agent, a filler, and the like are added to and mixed with the polycarbonate resin, and the mixture is stirred and mixed by an appropriate means. After that, a polycarbonate resin layer as a base material layer can be formed by extruding into a plate or sheet having a thickness of 0.1 to 10 mm using an extruder.

The weather-resistant resin layer provided on one side of the polycarbonate resin layer may be formed by laminating an acrylic resin or a polycarbonate resin containing a high-concentration ultraviolet absorber in the form of a film and laminating the polycarbonate resin layer on the polycarbonate resin layer. It is formed by co-extrusion with a polycarbonate resin.

The embossing applied to the other surface of the polycarbonate resin layer is performed by forming a sheet-like polycarbonate resin layer extruded by an extruder between a pair of rolls composed of a roll and a flat roll. It is carried out so that the resin layer is on the flat roll side. In order to obtain good lighting, the emboss depth should be 30 to
Preferably it is in the range of 70 μm. If it is shallower than 30 μm, the diffused light transmittance by the method of JIS K 7105 will be less than 40% and the blinding effect will be weakened. Conversely, if it is deeper than 70 μm, the total light transmittance by the same method will be less than 85% and the daylight Will be impaired.

[0013]

EXAMPLES (Example 1) Polycarbonate resin: Caliber 302E-4 (trade name, manufactured by Sumitomo Dow) was extruded from an extruder at a mold temperature of 280 ° C into a sheet having a thickness of 0.65 mm and a width of 900 mm. (Texture depth: 50 μm) and a pair of flat rolls, and a 0.05 mm acrylic resin film was laminated on the flat roll side smooth surface.
The obtained polycarbonate laminate of the present invention was subjected to JI using a light transmittance measuring device: C680 (trade name, manufactured by Suga Test Instruments Co., Ltd.).
When the optical characteristics were measured by SK 7105, the total light transmittance was 91% and the diffuse transmittance was 69%.

(Example 2) Polycarbonate resin: Caliber 302E-4 (described above) 100 parts by weight of an ultraviolet absorber: Tinuvin 1577 (trade name, manufactured by Ciba Geigy) 10 parts by weight, and polycarbonate resin: Caliber 302E -4 (described above) was co-extruded into two layers by an extrusion die having a multi-flow nozzle, and the weather-resistant resin layer was 50 μm, and the base material layer was 0.65
mm laminated sheet was obtained. Example 1
Then, embossing was performed on the polycarbonate resin layer side by passing between the same rolls to obtain a polycarbonate laminate of the present invention. When this optical property was measured, the total light transmittance was 90% and the diffuse transmittance was 65%.

[0015]

The polycarbonate laminate of the present invention has good weather resistance, and is excellent in daylighting and shielding properties.

Claims (1)

[Claims] 1. A polycarbonate laminate having a weather resistant resin layer provided on one side of a polycarbonate resin layer and embossed on the other side.