US4093593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester stabilization, and composition
Assignee: Graham Packaging Plastic Products Inc
•
Filing: 1977-09-14
•
Granted: 1978-06-06
•
Expires: 1997-09-14
Abstract
Abstract Saturated polyesters are stabilized against thermal degradation to yield acetaldehyde by forming an intimate admixture of said polyester and 5-hydroxy isophthalic acid.
Inventors
- 👤 Santos W. Go
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:55
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/13; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
A saturated polyester composition stabilized against thermal degradation to yield acetaldehyde which comprises (1) a saturated polyester having ##STR8## in its backbone and blended therewith (2) 0.3 to 3 weight percent of the polyester, of 5-hydroxy isophthalic acid.
Claim 2
Dependent Claim
38 words
A saturated polyester composition stabilized against thermal degradation to yield acetaldehyde which comprises (1) a saturated polyester having ##STR8## in its backbone and blended therewith (2) 0.3 to 3 weight percent of the polyester, of 5-hydroxy isophthalic acid.
Claim 3
Independent Claim
37 words
A method for stabilizing a saturated polyester containing ##STR9## which comprises forming an intimate admixture of said polyester with 0.3 to 3 parts by weight of 5-hydroxy isophthalic acid per 100 parts by weight of said polyester.
Claim 4
Independent Claim
37 words
A method for stabilizing a saturated polyester containing ##STR9## which comprises forming an intimate admixture of said polyester with 0.3 to 3 parts by weight of 5-hydroxy isophthalic acid per 100 parts by weight of said polyester.
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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |