Patent US5174755A successfully refreshed from Google Patents.
US4385145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphite stabilizers for polyester resins
Assignee: Borg Warner Corp
•
Filing: 1981-11-18
•
Granted: 1983-05-24
•
Expires: 2001-11-18
Abstract
Abstract Poly(alkylene terephthalate) compositions containing a stabilizing proportion of a pentaerythritol diphosphite ester. The compositions are relatively stable under usual processing conditions which include high temperatures. Color formation, molecular degradation and acetaldehyde contamination are inhibited significantly.
Inventors
- 👤 William E. Horn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:37
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/527
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
A polymer composition comprising a major proportion of a poly(alkylene terephthalate) wherein the alkylene group contains 2-4 carbon atoms and a minor proportion sufficient to impart thermal stability to said poly(alkylene terephthalate) of a bis-(alkylphenyl)pentaerythritol diphosphite ester.
Claim 2
Dependent Claim
37 words
A polymer composition comprising a major proportion of a poly(alkylene terephthalate) wherein the alkylene group contains 2-4 carbon atoms and a minor proportion sufficient to impart thermal stability to said poly(alkylene terephthalate) of a bis-(alkylphenyl)pentaerythritol diphosphite ester.
Claim 3
Dependent Claim
14 words
The polymer composition of claim 1 wherein the pentaerythritol diphosphite is a bis-(dialkylphenyl)pentaerythritol diphosphite.
Claim 4
Dependent Claim
13 words
The polymer composition of claim 1 wherein the pentaerythritol diphosphite is bis-(2,4-ditertiarybutylphenyl)pentaerythritol diphosphite.
References Cited (Backward Citations)
US3039993A
Cited
GB1180398A
Cited
US3940367A
Cited
US3928505A
Cited
US4064100A
Cited
US4097431A
Cited
GB1526603A
Cited
US4066611A
Cited
US4258153A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |