Patent US4131635A successfully refreshed from Google Patents.
US4131635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting polyester compositions
Assignee: Synres International BV
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Filing: 1977-01-25
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Granted: 1978-12-26
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Expires: 1997-01-25
Abstract
Abstract Thermosetting moulding material comprising an unsaturated polyester, a copolymerizable vinyl monomer and other additives are disclosed which contain as a shrinkage-reducing additive a copolymer of styrene with 2 to 10% by weight of an unsaturated monocarboxylic acid, and 15 to 40% by weight of a dialkyl ester of an unsaturated dicarboxylic acid. These compositions may be used as casting resins, in dough-moulding and in sheet-moulding to prepare dimensionally stable objects with a smooth surface and homogeneous coloration.
Inventors
- 👤 Frits M. W. Wilschut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:07
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
In thermosetting molding compositions composed of (a) a thermosetting polyester copolymer containing copolymerized styrene, (b) a shrinkage-reducing agent, and (c) a curing catalyst the improvement wherein said shrinkage-reducing agent is present in an amount of from 10 to 100% by weight based on the weight of said unsaturated polyester copolymer and is a copolymer of (i) 2 to 10% by weight of an olefinically unsaturated monocarboxylic acid containing 3 to 6 carbon atoms (ii) about 15 to 40% by weight of a dialkyl ester of an unsaturated dicarboxylic acid, in which each alkyl moiety contains 1 to 8 carbon atoms and the dicarboxylic acid moiety contains 4 to 9 carbon atoms, and (iii) the balance being styrene or a mixture of styrene with a minor amount of at least one other monomer.
Claim 2
Dependent Claim
132 words
In thermosetting molding compositions composed of (a) a thermosetting polyester copolymer containing copolymerized styrene, (b) a shrinkage-reducing agent, and (c) a curing catalyst the improvement wherein said shrinkage-reducing agent is present in an amount of from 10 to 100% by weight based on the weight of said unsaturated polyester copolymer and is a copolymer of (i) 2 to 10% by weight of an olefinically unsaturated monocarboxylic acid containing 3 to 6 carbon atoms (ii) about 15 to 40% by weight of a dialkyl ester of an unsaturated dicarboxylic acid, in which each alkyl moiety contains 1 to 8 carbon atoms and the dicarboxylic acid moiety contains 4 to 9 carbon atoms, and (iii) the balance being styrene or a mixture of styrene with a minor amount of at least one other monomer.
Claim 3
Dependent Claim
17 words
A molding composition according to claim 1, wherein said alkyl moiety is a branched chain alkyl radical.
Claim 4
Dependent Claim
12 words
A molding composition according to claim 1, further containing solid filler material.
Claim 5
Dependent Claim
48 words
A molding composition according to claim 1, in which said shrinkage-reducing agent is a copolymer containing from 4 to 8% by weight of said olefinically unsaturated carboxylic acid, from 20 to 25% by weight of said dialkyl ester of an olefinically unsaturated dicarboxylic acid, the balance being styrene.
Claim 6
Dependent Claim
37 words
A molding composition according to claim 1, in which said shrinkage-reducing agent is a copolymer of acrylic acid with a dialkyl ester of fumaric acid, in which each alkyl moiety contains from 3 to 6 carbon atoms.
Claim 7
Dependent Claim
33 words
A molding material according to claim 1, in which the refractive index of said shrinkage-reducing agent is about equal to the refractive index, after curing of the mixture of said unsaturated polyester copolymer.
Claim 8
Dependent Claim
33 words
A molding material according to claim 1, in which said shrinkage-reducing agent is present in an amount of from 25 to 65% by weight, based on the weight of said unsaturated polyester copolymer.
Claim 9
Dependent Claim
15 words
A molded article obtained by forming and curing a molding material according to claim 1.
Claim 10
Dependent Claim
98 words
A shrinkage-reducing agent for use with thermosetting molding compositions containing copolymerized styrene and a curing catalyst, which is a copolymer of (i) 2 to 10% by weight of an olefinically unsaturated monocarboxylic acid containing 3 to 6 carbon atoms (ii) about 15 to 40% by weight of a dialkyl ester of an unsaturated dicarboxylic acid, in which each alkyl moiety contains 1 to 8 carbon atoms and the dicarboxylic acid moiety contains 4 to 9 carbon atoms, and (iii) the balance being styrene or a mixture of styrene with a minor amount of at least one other monomer.
Claim 11
Dependent Claim
98 words
A shrinkage-reducing agent for use with thermosetting molding compositions containing copolymerized styrene and a curing catalyst, which is a copolymer of (i) 2 to 10% by weight of an olefinically unsaturated monocarboxylic acid containing 3 to 6 carbon atoms (ii) about 15 to 40% by weight of a dialkyl ester of an unsaturated dicarboxylic acid, in which each alkyl moiety contains 1 to 8 carbon atoms and the dicarboxylic acid moiety contains 4 to 9 carbon atoms, and (iii) the balance being styrene or a mixture of styrene with a minor amount of at least one other monomer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |