Patent US4483956A successfully refreshed from Google Patents.
US4483956A
Expired / Lapsed
US
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Acrylic resin article
Assignee: E C CHEMICAL IND Co Ltd
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Filing: 1983-04-19
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Granted: 1984-11-20
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Expires: 2003-04-19
Abstract
Abstract An acrylic resin article comprising a methyl methacrylate polymer and dibenzylidene sorbitol or its derivative as essential ingredients; and a process for producing an acrylic resin article, which comprises putting a composition comprising a methyl methacrylate monomer or a mixture of a methyl methacrylate polymer and a methyl methacrylate monomer and dibenzylidene sorbitol or its derivative in a mold, and thereafter polymerizing the methyl methacrylate monomer in the composition.
Inventors
- 👤 Hiroshi Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/156; C08K5/1575; A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
49 words
An acrylic resin article consisting essentially of a methyl methacrylate polymer and dibenzylidene sorbitol or its derivative wherein the amount of dibenzylidene sorbitol or its derivative is from 0.1 to 3.0% by weight based on the total weight of the methyl methacrylate polymer and dibenzylidene sorbitol or its derivative.
Claim 2
Dependent Claim
49 words
An acrylic resin article consisting essentially of a methyl methacrylate polymer and dibenzylidene sorbitol or its derivative wherein the amount of dibenzylidene sorbitol or its derivative is from 0.1 to 3.0% by weight based on the total weight of the methyl methacrylate polymer and dibenzylidene sorbitol or its derivative.
Claim 3
Dependent Claim
26 words
The article of claim 1 wherein the dibenzylidene sorbitol derivative is a ring compound having an alkyl group or an alkoxy group substituted on the ring.
Claim 4
Dependent Claim
80 words
A process for producing an acrylic resin article, which comprises placing in a mold a composition comprising a methyl methacrylate monomer or a mixture of a methyl methacrylate polymer and a methyl methacrylate monomer and dibenzylidene sorbitol or its derivative, wherein the composition contains 0.1 to 3% by weight of dibenzylidene sorbitol or its derivative based on the total weight of the methyl methacrylate component and the dibenzylidene sorbitol component; and thereafter polymerizing the methyl methacrylate monomer in the composition.
Claim 5
Dependent Claim
80 words
A process for producing an acrylic resin article, which comprises placing in a mold a composition comprising a methyl methacrylate monomer or a mixture of a methyl methacrylate polymer and a methyl methacrylate monomer and dibenzylidene sorbitol or its derivative, wherein the composition contains 0.1 to 3% by weight of dibenzylidene sorbitol or its derivative based on the total weight of the methyl methacrylate component and the dibenzylidene sorbitol component; and thereafter polymerizing the methyl methacrylate monomer in the composition.
Claim 6
Dependent Claim
19 words
The process of claim 3 wherein the polymerization is carried out at a temperature of 40° to 100° C.
References Cited (Backward Citations)
GB116889A
Cited
US4193906A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |