US4469851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding composition
Assignee: Hoechst Celanese Chemical Co
•
Filing: 1983-06-06
•
Granted: 1984-09-04
•
Expires: 2003-06-06
Abstract
Abstract Molding composition which is a blend of polybutylene terephthalate and segmented thermoplastic copolyester elastomer. The elastomer contains recurring polymeric long chain ester units derived from phthalic acids and long chain glycols and short chain ester units derived from phthalic acids and a mixture of 1,4-butanediol and 1,4-butenediol.
Inventors
- 👤 John J. Charles
- 👤 Suzanne B. Nelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:16
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08L67/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
Molding composition comprising a blend of: a. between about 5 and about 95 wt % polybutylene terephthalate; and b. between about 95 and about 5 wt % segmented thermoplastic copolyester elastomer which consists essentially of a multiplicity of recurring long chain ester units and short chain ester units joined head to tail through ester linkages, said long chain ester units being represented by the formula ##STR5## and said short chain ester units being represented by the formula ##STR6## where G is a divalent radical remaining after the removal of the terminal hydroxyl groups from a difunctional polyether glycol having a number average molecular weight in the range from about 400 to about 6,000, R is a hydrocarbon radical remaining after removal of the carboxyl groups from terephthalic acid or isophthalic acid, and D is a divalent radical remaining after removal of hydroxyl groups from 1,4 butanediol or 1,4 butenediol; provided: (i) said short chain segments amount to between about 30% and about 85% of the copolyester; and (ii) between about 10% and about 40% of the D groups represent divalent radicals remaining after removal of hydroxyl groups from 1,4 butenediol.
Claim 2
Dependent Claim
190 words
Molding composition comprising a blend of: a. between about 5 and about 95 wt % polybutylene terephthalate; and b. between about 95 and about 5 wt % segmented thermoplastic copolyester elastomer which consists essentially of a multiplicity of recurring long chain ester units and short chain ester units joined head to tail through ester linkages, said long chain ester units being represented by the formula ##STR5## and said short chain ester units being represented by the formula ##STR6## where G is a divalent radical remaining after the removal of the terminal hydroxyl groups from a difunctional polyether glycol having a number average molecular weight in the range from about 400 to about 6,000, R is a hydrocarbon radical remaining after removal of the carboxyl groups from terephthalic acid or isophthalic acid, and D is a divalent radical remaining after removal of hydroxyl groups from 1,4 butanediol or 1,4 butenediol; provided: (i) said short chain segments amount to between about 30% and about 85% of the copolyester; and (ii) between about 10% and about 40% of the D groups represent divalent radicals remaining after removal of hydroxyl groups from 1,4 butenediol.
Claim 3
Dependent Claim
37 words
Composition according to claim 1 wherein G is a divalent radical remaining after removal of terminal hydroxy groups from a difunctional polyether glycol having a carbon to oxygen ratio between about 2.0 and about 4.3 to 1.
Claim 4
Dependent Claim
23 words
Composition according to claim 1 wherein the short chain segments amount to between about 45 and about 65% by weight of the copolyester.
Claim 5
Dependent Claim
28 words
Composition according to claim 1 wherein between about 20 and about 30% of the D groups represent divalent radicals remaining after removal of hydroxyl groups from 1,4 butenediol.
Claim 6
Dependent Claim
30 words
Composition according to claim 4 wherein between about 1 and about 20% of the R groups are hydrocarbon radicals remaining after removal of the carboxyl groups from dimethyl isophthalic acid.
Claim 7
Dependent Claim
21 words
Composition according to claim 1 wherein G is a divalent radical remaining after removal of terminal hydroxyl groups from poly(tetramethylene oxide)glycol.
Claim 8
Dependent Claim
22 words
Composition according to claim 1 wherein G is a divalent radical remaining after removal of terminal hydroxyl groups from poly(ethylene oxide) glycol.
Claim 9
Dependent Claim
22 words
Composition according to claim 5 wherein G is a divalent radical remaining after removal of terminal hydroxyl groups from poly(tetramethylene oxide) glycol.
Claim 10
Dependent Claim
26 words
Composition according to claim 1 wherein PBT is present in an amount between about 10 and about 50 wt % based on PBT and said elastomer.
Claim 11
Dependent Claim
19 words
Composition according to claim 1 wherein the PBT has an intrinsic viscosity between about 0.6 and about 1.2 dl/g.
Claim 12
Dependent Claim
22 words
Composition according to claim 10 wherein G is a divalent radical remaining after removal of terminal hydroxyl groups from poly(tetramethylene oxide) glycol.
References Cited (Backward Citations)
US3907926A
Cited
US4355155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |