EP0073450A2
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EP
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Process for producing a light-diffusible methacrylic resin, and formed articles having a delustered surface
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-08-23
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Granted: —
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Expires: 2002-08-23
Abstract
Abstract A light-diffusible methacrylic resin composed of 80 to 99.9% by weight of a polymer (A) forming a continuous phase and 20 to 0.1 % by weight of a polymer (B) forming a dispersed phase is disclosed. Polymer (A) is a polymer prepared from methyl methacrylate by itself or a polymerizable unsaturated monomer mixture containing at least 80% by weight of methyl methacrylate; polymer (B) is a polymer prepared from at least one polymerizable unsaturated monomer represented by the general formula [I]: in which R 1 is a hydrogen atom or a methyl group and R 2 is a hydrocarbon radical having at least 2 carbon atoms or a derivative thereof. Alternatively polymer (B) may be a polymerizable unsaturated monomer mixture containing at least 50% by weight of at least one polymerizable unsaturated monomer represented by the general formula [I]. The polymer components A and B are selected such that the ratio of the refractive index n B of the polymer (B) to the refractive index n A of the polymer (A) is in the range of 0.950 ≦ n B /n A < 0.998 or 1.002 < nB/nA 1.050.
Inventors
- 👤 Kazumasa Kamada
- 👤 Katsumi Tamai
- 👤 Kazunori Abe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 23:03
CPC Classifications
C; C08; C08F; C08F265/00; C08F265/04; C08F265/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
180 words
A light-diffusible methacrylic resin composition comprising: about 80 to about 99.9% by weight of a polymer (A) forming a continuous phase and about 20 to about 0.1% by weight of a polymer (B) forming a dispersed phase, in which polymer (A) is a polymer prepared from methyl methacrylate alone or a polymerizable unsaturated monomer mixture containing at least 80% by weight of methyl methacrylate and polymer (B) is a polymer prepared from at least one polymerizable unsaturated monomer represented by the formula: wherein R 1 represents a hydrogen atom or a methyl radical and R 2 represents a hydrocarbon radical having at least 2 carbon atoms or a derivative thereof, or a polymerizable unsaturated monomer mixture containing at least 50% by weight of at least one polymerizable unsaturated monomer represented by the above formula, provided that the ratio of the refractive index n B of the polymer (B) to the refractive index n A of the polymer (A) is in the range of 0.950 ≦ n B/ n A < 0.998 or 1.002 < n B /n A ≦ 1.050.
Claim 2
Dependent Claim
180 words
A light-diffusible methacrylic resin composition comprising: about 80 to about 99.9% by weight of a polymer (A) forming a continuous phase and about 20 to about 0.1% by weight of a polymer (B) forming a dispersed phase, in which polymer (A) is a polymer prepared from methyl methacrylate alone or a polymerizable unsaturated monomer mixture containing at least 80% by weight of methyl methacrylate and polymer (B) is a polymer prepared from at least one polymerizable unsaturated monomer represented by the formula: wherein R 1 represents a hydrogen atom or a methyl radical and R 2 represents a hydrocarbon radical having at least 2 carbon atoms or a derivative thereof, or a polymerizable unsaturated monomer mixture containing at least 50% by weight of at least one polymerizable unsaturated monomer represented by the above formula, provided that the ratio of the refractive index n B of the polymer (B) to the refractive index n A of the polymer (A) is in the range of 0.950 ≦ n B/ n A < 0.998 or 1.002 < n B /n A ≦ 1.050.
Claim 3
Dependent Claim
41 words
The light-diffusible methacrylic resin composition as claimed in claim 1, in which the size of individual dispersed particles is 0.1 to 500 microns as calculated as the radius of equivalent spheres having the same refractive index and equal light scattering cross-section.
Claim 4
Dependent Claim
31 words
The light-diffusible methacrylic resin composition as claimed in claim 1, in which R 2 represents a halogen-substituted or unsubstituted alkyl, cycloalkyl or aralkyl radical each having 2 to 18 carbon atoms.
Claim 5
Dependent Claim
43 words
The light-diffusible methacrylic resin composition as claimed in claim 1, 2 or 3 in which the amount of the continuous phase is about 90 to about 99.5% by weight and the amount of dispersed phase is about 10 to about 0.5% by weight.
Claim 6
Dependent Claim
122 words
A process for producing a light-diffusible methacrylic resin composition of claim 1 comprising: (1) dissolving or dispersing a polymer ( B ) into methyl methacrylate, partially polymerized methyl methacrylate, a polymerizable unsaturated monomer mixture containing at least 80% by weight of methyl methacrylate or a partially polymerized product thereof for the formation of the polymer (A), and (2) polymerizing the solution or dispersion in the presence of a radical polymerization initiator under conditions such that the ratio of the refractive index n B of the polymer (B) to the refractive index n A of the . polymer (A) is in the range of 0.950 < n B /n A < 0.998 or 1. 0 02 < n B/ n A < 1.050.
Claim 7
Dependent Claim
23 words
The process for producing a light-diffusible methacrylic resin according to claim 5, in which the polymerization is carried out in a casting mold.
Claim 8
Dependent Claim
203 words
A light-diffusibile methacrylic resin formed article having a delustered surface obtained by draw-forming of a light-diffusible methacrylic resin comprising about 80 to about 99.9% by weight of a polymer (A) forming a continuous phase and about 20 to about 0.1% by weight of a polymer (B) forming a dispersed phase, at a temperature higher than a heat distortion temperature of said resin, wherein polymer (A) is a polymer prepared from methyl methacrylate alone or a polymerizable unsaturated monomer mixture containing at least 80% by weight of methyl methacrylate, polymer (B) is a polymer prepared from at least one polymerizable unsaturated monomer represented by the formula: wherein R 1 represents a hydrogen atom or a methyl radical and R 2 represents a hydrocarbon radical having at least 2 carbon atoms or a derivative thereof, or a polymerizable unsaturated monomer mixture containing at least 50% by weight of at least one polymerizable unsaturated monomer represented by the above formula, provided that the ratio of the refractive index n B of the polymer (B) to the refractive index n A of the polymer (A) is in the range of 0.950 ≦ n B/ n A < 0.998 or 1.002 < n B /n A ≦ 1.050.
Claim 9
Dependent Claim
203 words
A light-diffusibile methacrylic resin formed article having a delustered surface obtained by draw-forming of a light-diffusible methacrylic resin comprising about 80 to about 99.9% by weight of a polymer (A) forming a continuous phase and about 20 to about 0.1% by weight of a polymer (B) forming a dispersed phase, at a temperature higher than a heat distortion temperature of said resin, wherein polymer (A) is a polymer prepared from methyl methacrylate alone or a polymerizable unsaturated monomer mixture containing at least 80% by weight of methyl methacrylate, polymer (B) is a polymer prepared from at least one polymerizable unsaturated monomer represented by the formula: wherein R 1 represents a hydrogen atom or a methyl radical and R 2 represents a hydrocarbon radical having at least 2 carbon atoms or a derivative thereof, or a polymerizable unsaturated monomer mixture containing at least 50% by weight of at least one polymerizable unsaturated monomer represented by the above formula, provided that the ratio of the refractive index n B of the polymer (B) to the refractive index n A of the polymer (A) is in the range of 0.950 ≦ n B/ n A < 0.998 or 1.002 < n B /n A ≦ 1.050.
Claim 10
Dependent Claim
43 words
The light-diffusible methacrylic I resin formed article as claimed in claim 7, in which the size of individual dispersed particles is 0.1 to 500 microns as calculated as the radius of equivalent spheres having the same refractve index and equal light scattering cross-section.
Claim 11
Dependent Claim
32 words
The light-diffusible methacrylic resin formed article as claimed in claim 7, in which R 2 represents a halogen-substituted or unsubstituted alkyl, cycloalkyl or aralkyl radical each having 2 to 18 carbon atoms.
Claim 12
Dependent Claim
41 words
The light-diffusible methacrylic resin formed article as claimed in claim 7, in which the amount of the continuous phase is about 90 to about 99.5% by weight and the amount of dispersed phase is about 10 to about 0.5% by weight.
References Cited (Backward Citations)
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