US3607836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New color improved polyesters of chlorendic acid or anhydride
Assignee: Velsicol Chemical LLC
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Filing: 1969-02-14
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Granted: 1971-09-21
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Expires: 1989-02-14
Abstract
Abstract This invention discloses the improvement in the preparation of unsaturated polyesters of chlorendic acid or anhydride which comprises carrying out the esterification reaction in the presence of a color inhibiting amount of a combination of phosphoric acid and 2,6-di-t-butyl-p-cresol.
Inventors
- 👤 Richard L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:13
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/32; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6828; C08K5/00; C08K5/04; C08K5/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
40 words
The composition of claim 1 wherein phosphoric acid is present in an amount of from 0.01 to 2 percent and 2,6-di-t-butyl-p-cresol is present in an amount of from 0.005 to 0.5 percent, based on the weight of polymer''s monomeric precursors.
Claim 2
Dependent Claim
22 words
A polyester composition as reciTed in claim 1 wherein the color inhibitors are present during the esterification reaction of the polyester''s formation.
Claim 3
Dependent Claim
22 words
A polyester composition as recited in claim 2 wherein the color inhibitors are present during the esterification reaction of the polyester''s formation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |