US4298711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low shrink unsaturated polyester resinous composition
Assignee: Cargill Inc
•
Filing: 1980-04-09
•
Granted: 1981-11-03
•
Expires: 2000-04-09
Abstract
Abstract A low shrink unsaturated polyester based upon propylene glycol terephthalate reacted with a dibasic acid or anhydrides thereof and glycols.
Inventors
- 👤 Thomas J. Moulson
- 👤 John E. Greenzweig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:55
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/676
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
A low shrink polyester resin which is a product of (a) mixing from about 25 to about 35 parts by weight of a member selected from the group consisting of maleic acid, fumaric acid, their anhydrides and mixtures thereof, from about 5 to about 25 parts by weight of a member selected from the group consisting of isophthalic acid, phthalic acid, their anhydrides, and mixtures thereof, from about 10 to about 40 parts by weight propylene glycol, from about 10 to about 30 parts by weight dipropylene glycol, from about 5 to about 30 parts by weight propylene glycol terephthalate, (b) heating said mixture at about 420° F. until a neat resin is formed with an acid number of from about 5 to about 50; and (c) diluting the neat resin with from about 25 to about 100 parts by weight of a member selected from the group consisting of styrene, vinyl toluene and mixtures thereof.
Claim 2
Dependent Claim
156 words
A low shrink polyester resin which is a product of (a) mixing from about 25 to about 35 parts by weight of a member selected from the group consisting of maleic acid, fumaric acid, their anhydrides and mixtures thereof, from about 5 to about 25 parts by weight of a member selected from the group consisting of isophthalic acid, phthalic acid, their anhydrides, and mixtures thereof, from about 10 to about 40 parts by weight propylene glycol, from about 10 to about 30 parts by weight dipropylene glycol, from about 5 to about 30 parts by weight propylene glycol terephthalate, (b) heating said mixture at about 420° F. until a neat resin is formed with an acid number of from about 5 to about 50; and (c) diluting the neat resin with from about 25 to about 100 parts by weight of a member selected from the group consisting of styrene, vinyl toluene and mixtures thereof.
Claim 3
Dependent Claim
15 words
A resin in accordance with claim 1 wherein said mixture is heated with an inhibitor.
Claim 4
Dependent Claim
26 words
A resin in accordance with claim 1 wherein hydroquinone is added with the member selected from the group consisting of styrene, vinyl toluene and mixtures thereof.
Claim 5
Independent Claim
142 words
A method of synthesizing a low shrink polyester resin comprising: (a) heating at 420° F. a mixture of from about 25 to about 35 parts by weight of a member selected from the group consisting of maleic acid, fumaric acid, their anhydrides and mixtures thereof, from about 5 to about 25 parts by weight of a member selected from the group consisting of isophthalic acid, phthalic acid, their anhydrides and mixtures thereof, from about 10 to about 40 parts by weight propylene glycol, from about 10 to about 30 parts by weight dipropylene glycol, and from about 5 to about 30 parts by weight propylene glycol terephthalate to a neat resin with an acid number from about 5 to about 50; and (b) diluting said neat resin with a member selected from the group consisting of styrene, vinyl toluene and mixtures thereof.
Claim 6
Independent Claim
142 words
A method of synthesizing a low shrink polyester resin comprising: (a) heating at 420° F. a mixture of from about 25 to about 35 parts by weight of a member selected from the group consisting of maleic acid, fumaric acid, their anhydrides and mixtures thereof, from about 5 to about 25 parts by weight of a member selected from the group consisting of isophthalic acid, phthalic acid, their anhydrides and mixtures thereof, from about 10 to about 40 parts by weight propylene glycol, from about 10 to about 30 parts by weight dipropylene glycol, and from about 5 to about 30 parts by weight propylene glycol terephthalate to a neat resin with an acid number from about 5 to about 50; and (b) diluting said neat resin with a member selected from the group consisting of styrene, vinyl toluene and mixtures thereof.
Claim 7
Dependent Claim
18 words
A method in accordance with claim 4 wherein said mixture is heated with the addition of an inhibitor.
Claim 8
Dependent Claim
26 words
A method in accordance with claim 4 wherein hydroquinone is added with the member selected from the group consisting of styrene, vinyl toluene and mixtures thereof.
Claim 9
Dependent Claim
11 words
An article molded from a polyester in accordance with claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |