US3676404A
Expired / Lapsed
US
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Methyl methacrylate copolymers
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-06-09
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Granted: 1972-07-11
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Expires: 1990-06-09
Abstract
Abstract Copolymers prepared from methyl methacrylate, electron deficient monomers, for example N-aryl maleimides and other ethylenically, unsaturated monomers copolymerisable therewith.
Inventors
- 👤 Eric Nield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A copolymer of methyl methacrylate and N-aryl maleimide consisting essentially of from 65 to 99 percent by weight of methyl methacrylate units, 1 to 35 percent by weight of N-aryl maleimide units, and 0 to 15 percent by weight of units of other ethylenically unsaturated compounds copolymerizable with both said methyl methacrylate and said N-aryl maleimide, said other ethylenically unsaturated compounds being selected from the group consisting of vinyl acetate, esters of acrylic acid, esters of methacrylic acid other than methyl methacrylate, vinyl chloride, vinylidene chloride, styrene, Alpha -methyl styrene and halogen substituted styrene, vinyl and isopropenyl ethers, and dienes.
Claim 2
Dependent Claim
41 words
A copolymer according to claim 2 consisting essentially of from 80 to 95 percent by weight of methyl methacrylate units, 5 to 20 percent by weight of N-aryl maleimide units and 0 to 15 percent of said any other polymerizable compound.
Claim 3
Dependent Claim
57 words
A copolymer according to claim 2 in which said N-aryl maleimide is selected from the group consisting of N-phenyl maleimide, substituted derivatives thereof in which at least one of the aromatically bound hydrogen atoms has been substituted by a halogen atom or an alkyl group containing from one to four carbon atoms and N- Alpha -naphthyl maleimide.
Claim 4
Dependent Claim
30 words
A copolymer according to claim 4 in which in said N-aryl maleimide at least one of the aromatically bound hydrogen atoms has been substituted by a chlorine or bromine atom.
Claim 5
Dependent Claim
28 words
A copolymer according to claim 4 in which in said N-phenyl maleimide the aromatically bound hydrogen atom attached to the 2-position on the phenyl radical has been substituted.
Claim 6
Dependent Claim
31 words
A copolymer according to claim 2 in which the monomer which provides residues forming from 0 to 15 percent by weight of the copolymer is selected from styrene and vinyl ethers.
References Cited (Backward Citations)
US3480598A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |