US4272429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable, flame-retardant polymers and selected oligomers useful therein
Assignee: EIDP Inc
•
Filing: 1980-02-29
•
Granted: 1981-06-09
•
Expires: 2000-02-29
Abstract
Abstract Oligomers of aromatic diols and brominated diphenyl compounds are described. They are useful in resin blends with thermoplastic polymers to impart flame-retardancy thereto without substantial resin degradation at molding temperatures.
Inventors
- 👤 Richard H. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:48
CPC Classifications
C; C08; C08L; C08L71/00; C07; C07C; C07C43/00; C07C43/02; C07C43/257; C07C43/29; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/40; C08G65/4006; C08G65/48; C08G75/00; C08G75/20; C08G75/23; C08K; C08K5/00; C08K5/0008; C08K5/0066; C08L101/00; C08L81/00; C08L81/06; C08G2650/00; C08G2650/28; C08G2650/46; C08G2650/48
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A flame-retardant blend consisting of (a) a thermoplastic, film-forming polyamide (b) between about 1-30 percent by weight based on blend of an oligomer represented by the formula ##STR6## wherein R is a divalent arylene group of between about 6-15 carbon atoms; each A is independently hydrogen or bromine with the proviso that at least 6 of the A groups are bromine; n is a cardinal number of between about 2 and about 20; and Z is 0, S, ##STR7## (c) and between about 1-15 percent by weight based on blend of a metal oxide synergist that does not substantially degrade the polymer.
Claim 2
Dependent Claim
102 words
A flame-retardant blend consisting of (a) a thermoplastic, film-forming polyamide (b) between about 1-30 percent by weight based on blend of an oligomer represented by the formula ##STR6## wherein R is a divalent arylene group of between about 6-15 carbon atoms; each A is independently hydrogen or bromine with the proviso that at least 6 of the A groups are bromine; n is a cardinal number of between about 2 and about 20; and Z is 0, S, ##STR7## (c) and between about 1-15 percent by weight based on blend of a metal oxide synergist that does not substantially degrade the polymer.
Claim 3
Dependent Claim
14 words
The blend of claim 1 wherein in the thermoplastic film-forming polymer is polyhexamethylene adipamide.
Claim 4
Dependent Claim
18 words
The blend of claim 1 wherein the thermoplastic film-forming polymer is a mixture of polyhexamethylene adipamide and polycaprolactam.
Claim 5
Dependent Claim
13 words
The blend of claim 1 which contains a filler or a reinforcing agent.
Claim 6
Dependent Claim
9 words
The blend of claim 1 which contains glass fibers.
References Cited (Backward Citations)
US3076784A
Cited
US3395120A
Cited
US3355272A
Cited
US3532759A
Cited
US3755467A
Cited
US3929901A
Cited
DE2021830C3
Cited
US3760003A
Cited
US3989531A
Cited
DE2432833A1
Cited
FR2369312A1
Cited
DE2659537A1
Cited
US4141880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |