US3933757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dicyclopentadiene thermosetting polyester
Assignee: SCM Corp
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Filing: 1974-10-21
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Granted: 1976-01-20
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Expires: 1994-10-21
Abstract
Abstract The invention pertains to a dicyclopentadiene modified thermosetting polyester polymer wherein dicyclopentadiene is preferentially esterified in the polymer chain. The dicyclopentadiene polyester polymer is mixed with an ethylenically unsaturated monomer to provide thermosetting polyester resin.
Inventors
- 👤 Ivor Pratt
- 👤 Ulrich Boschert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/553; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A method of synthesizing a thermosetting dicyclopentadiene terminated polyester from glycol, dicarboxylic acid, and dicyclopentadiene, said polyester suitable for mixing with sytrene to provide a thermosettable polyester resin, the improvement comprising: reacting an excess molar equivalent of dicarboxylic acid with glycol to produce an acid terminated partial polymer having carboxyl groups; reacting about 0.1-0.4 mols of dicyclopentadiene per mol of unsaturated dicarboxylic acid with said acid terminated partial polymer at temperatures between about 290°- 310°F. until substantially all of said dicyclopentadiene is esterified with said carboxyl groups.
Claim 2
Independent Claim
87 words
A method of synthesizing a thermosetting dicyclopentadiene terminated polyester from glycol, dicarboxylic acid, and dicyclopentadiene, said polyester suitable for mixing with sytrene to provide a thermosettable polyester resin, the improvement comprising: reacting an excess molar equivalent of dicarboxylic acid with glycol to produce an acid terminated partial polymer having carboxyl groups; reacting about 0.1-0.4 mols of dicyclopentadiene per mol of unsaturated dicarboxylic acid with said acid terminated partial polymer at temperatures between about 290°- 310°F. until substantially all of said dicyclopentadiene is esterified with said carboxyl groups.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the dicyclopentadiene reacts with said acid terminated partial polymer to form an acid terminated prepolymer, and additional glycol is reacted with said prepolymer to further esterify unreacted carboxyl groups.
Claim 4
Dependent Claim
43 words
The process of claim 2 wherein about one-half the glycol requirements is first reacted with excess molar dicarboxylic acid, and the other one-half of the glycol requirements is reacted after the intermediate step of esterifying said dicyclopentadiene with said acid terminated partial polymer.
Claim 5
Dependent Claim
29 words
A dicyclopentadiene terminated, thermosetting polyester wherein dicyclopentadiene is substantially esterified with carboxyl groups of the acid terminated partial polymer in accordance with the process set forth in 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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |