US5004785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-diffusing methacrylic resin and process for production thereof
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-11-28
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Granted: 1991-04-02
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Expires: 2008-11-28
Abstract
Abstract There are disclosed a light-diffusing methacrylic resin comprising a dispersion of crosslinked fine particles in a substrate polymer comprising mainly methyl methacrylate and having the characteristics mentioned below: (1) the difference between the refractive indexes of the crosslinked fine particles and the substrate polymer is 0.02 to 0.15. (2) the concentration by weight of the poly-functional monomer used as starting material in the crosslinked fine particles is 5 to 20%, (3) the average particle diameter of the crosslinked fine particles in the light-diffusing methacrylic resin is 5 to 20 mu , the percentage of particles having a particle diameter of 2 mu or less being less than 1% by weight in the total amount of the crosslinked fine particles to be mixed, and (4) the concentration by weight of the crosslinked fine particles in the light-diffusing methacrylic resin is 0.08 to 10%, and a process thereof.
Inventors
- 👤 Kozo Ida
- 👤 Tetsuya Horiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:14
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/02; G02B5/0205; G02B5/0236; G02B5/0242; C; C08; C08F; C08F257/00; C08F257/02; G02B5/0273; G02B5/0278; Y; Y10; Y10S; Y10S525/00; Y10S525/931
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
194 words
A light-diffusing methacrylic resin comprising a dispersion of crosslinked fine particles in a substrate polymer comprising mainly methyl methacrylate, said crosslinked fine particles being obtained by copolymerizing at least either a phenyl group containing vinyl or a phenyl group containing (meth)acrylate with a polyfunctional monomer copolymerizable therewith, and said resin being characterized in that (1) the difference between the refractive indexes of the crosslinked fine particles and the substrate polymer is 0.02 to 0.15, (2) the concentration by weight of the polyfunctional monomer in the crosslinked fine particles is 5 to 20%, (3) the average particle diameter of the crosslinked fine particles in the light-diffusing methacrylic resin is 5 to 20 μ, the percentage of particles having a particle diameter of 2 μ or less being less than 1% by weight in the total amount of the crosslinked fin particles to be mixed, the percentage of particles having a particle diameter of 30 μ or more being less than 0.5% by weight of the total amount of the crosslinked fine particles to be mixed, and (4) the concentration by weight of the crosslinked fine particles in the light-diffusing methacrylic resin is 0.08 to 10%.
Claim 2
Dependent Claim
194 words
A light-diffusing methacrylic resin comprising a dispersion of crosslinked fine particles in a substrate polymer comprising mainly methyl methacrylate, said crosslinked fine particles being obtained by copolymerizing at least either a phenyl group containing vinyl or a phenyl group containing (meth)acrylate with a polyfunctional monomer copolymerizable therewith, and said resin being characterized in that (1) the difference between the refractive indexes of the crosslinked fine particles and the substrate polymer is 0.02 to 0.15, (2) the concentration by weight of the polyfunctional monomer in the crosslinked fine particles is 5 to 20%, (3) the average particle diameter of the crosslinked fine particles in the light-diffusing methacrylic resin is 5 to 20 μ, the percentage of particles having a particle diameter of 2 μ or less being less than 1% by weight in the total amount of the crosslinked fin particles to be mixed, the percentage of particles having a particle diameter of 30 μ or more being less than 0.5% by weight of the total amount of the crosslinked fine particles to be mixed, and (4) the concentration by weight of the crosslinked fine particles in the light-diffusing methacrylic resin is 0.08 to 10%.
Claim 3
Dependent Claim
18 words
A light-diffusing methacrylate resin according to claim 1, whereon styrene is used as the phenyl group containing vinyl.
Claim 4
Dependent Claim
19 words
A light-diffusing methacrylic resin according to claim 1, whereon phenyl methacrylate is used as the phenyl group containing (meth)acrylate.
Claim 5
Dependent Claim
16 words
A light-diffusing methacrylic resin according to claim 1, whereon divinylbenzene is used as the polyfunctional monomer.
Claim 6
Dependent Claim
18 words
A light-diffusing methacrylic resin according to claim 1, whereon ethylene glycol dimethacrylate is used as the polyfunctional monomer.
Claim 7
Dependent Claim
17 words
A light-diffusing methacrylic resin according to claim 1, wherein acryl methacrylate is used as the polyfunctional monomer.
Claim 8
Dependent Claim
26 words
A light-diffusing methacrylic resin according to claim 1, whereon styrene is used as the phenyl group containing vinyl and divinylbenzene is used as the polyfunctional monomer.
Claim 9
Dependent Claim
211 words
A process for producing a light-diffusing methacrylic resin comprising dispersing crosslinked fine particles in a monomer comprising mainly methyl methacrylate or a partial polymer thereof which constitutes a substrate polymer, followed by casting and polymerization, said crosslinked fine particles being obtained by copolymerizing a phenyl group containing vinyl, a phenyl group containing (meth)acrylate, or a mixture of them, with a polyfunctional monomer copolymerizable therewith, and said process being characterized in that (1) the difference between the refractive indexes of the crosslinked fine particles and the substrate polymer is 0.2 to 0.15, (2) the concentration by weight of the polyfunctional monomer in the crosslinked fine particles is 5 to 20%, (3) the average particle diameter of the crosslinked fine particles in the light-diffusing methacrylic resin is 5 to 20 μ, the percentage of particles having a particle diameter of 2 μ or less being less than 1% by weight in the total amount of the crosslinked fine particles to be mixed, the percentage of particles having a particle diameter of 30 μ or more being less than 0.5% by weight of the total amount of the crosslinked fine particles to be mixed, and (4) the concentration by weight of the crosslinked fine particles in the light-diffusing methacrylic resin is 0.08 to 10%.
Claim 10
Dependent Claim
211 words
A process for producing a light-diffusing methacrylic resin comprising dispersing crosslinked fine particles in a monomer comprising mainly methyl methacrylate or a partial polymer thereof which constitutes a substrate polymer, followed by casting and polymerization, said crosslinked fine particles being obtained by copolymerizing a phenyl group containing vinyl, a phenyl group containing (meth)acrylate, or a mixture of them, with a polyfunctional monomer copolymerizable therewith, and said process being characterized in that (1) the difference between the refractive indexes of the crosslinked fine particles and the substrate polymer is 0.2 to 0.15, (2) the concentration by weight of the polyfunctional monomer in the crosslinked fine particles is 5 to 20%, (3) the average particle diameter of the crosslinked fine particles in the light-diffusing methacrylic resin is 5 to 20 μ, the percentage of particles having a particle diameter of 2 μ or less being less than 1% by weight in the total amount of the crosslinked fine particles to be mixed, the percentage of particles having a particle diameter of 30 μ or more being less than 0.5% by weight of the total amount of the crosslinked fine particles to be mixed, and (4) the concentration by weight of the crosslinked fine particles in the light-diffusing methacrylic resin is 0.08 to 10%.
Claim 11
Dependent Claim
16 words
A process according to claim 8, wherein styrene is used as the phenyl group containing vinyl.
Claim 12
Dependent Claim
17 words
A process according to claim 8, wherein phenyl methacrylate is used as the phenyl group containing (meth)acrylate.
Claim 13
Dependent Claim
14 words
A process according to claim 8, wherein divinylbenzene is used as the polyfunctional monomer.
Claim 14
Dependent Claim
16 words
A process according to claim 8, wherein ethylene glycol dimethacrylate is used as the polyfunctional monomer.
Claim 15
Dependent Claim
15 words
A process according to claim 8, wherein acryl methacrylate is used as the polyfunctional monomer.
Claim 16
Dependent Claim
24 words
A process according to claim 8, wherein styrene is used as the phenyl group containing vinyl and divinylbenzene is used as the polyfunctional monomer.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
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