US4218546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resins
Assignee: British Industrial Plastics Ltd
•
Filing: 1977-10-14
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Granted: 1980-08-19
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Expires: 1997-10-14
Abstract
Abstract A polyester resin composition comprising a thixotropic solution of an unsaturated polyester resin in a volatile monomer containing also a polymer which is partially incompatible with the polyester resin solution i.e. forms a hazy solution in it. The partially incompatible polymer can be a polymer of an ester of an unsaturated carboxylic acid.
Inventors
- 👤 Brian Y. Downing
- 👤 George D. Hamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:45
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
In a polyester resin composition for use in the preparation of resin/fibre laminates which comprises a solution of an unsaturated polyester resin in a volatile monomer, the improvement comprising incorporating in said composition a thixotropic agent and a polymer which is partially incompatible with the polyester resin solution said partially incompatible polymer being formed by addition polymerization using carbon-carbon unsaturation and whose monomeric unit consists essentially of an alkyl ester of an αβ unsaturated di-basic carboxylic acid, whereby monomer vapor emission is substantially reduced.
Claim 2
Dependent Claim
84 words
In a polyester resin composition for use in the preparation of resin/fibre laminates which comprises a solution of an unsaturated polyester resin in a volatile monomer, the improvement comprising incorporating in said composition a thixotropic agent and a polymer which is partially incompatible with the polyester resin solution said partially incompatible polymer being formed by addition polymerization using carbon-carbon unsaturation and whose monomeric unit consists essentially of an alkyl ester of an αβ unsaturated di-basic carboxylic acid, whereby monomer vapor emission is substantially reduced.
Claim 3
Dependent Claim
29 words
A polyester resin composition according to claim 1 wherein said partially incompatible polymer is present in an amount in the range 0.1 to 1.0% by weight of the composition.
Claim 4
Dependent Claim
35 words
A polyester resin composition according to claim 1 or 25 wherein the partially incompatible polymer is a polymer of an alkyl fumarate or itaconate in which the alkyl groups contain 4 to 12 carbon atoms.
Claim 5
Dependent Claim
22 words
A polyester resin composition according to claim 1 wherein said partially incompatible polymer is a polymer of di-butyl fumarate or di-decyl itaconate.
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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) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |