Patent US4197235A successfully refreshed from Google Patents.
US4197235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide compositions
Assignee: EIDP Inc
•
Filing: 1978-08-16
•
Granted: 1980-04-08
•
Expires: 1998-08-16
Abstract
Abstract A fire retardant polyamide composition containing at least 10% by weight of a polyamide containing a major proportion of nylon 66 or nylon 6 units and from 1 to 90%, preferably 5 to 25% by weight of a salt derived from melamine or a melamine derivative containing at least one --NH 2 group, the salt being chosen from at least one of the borate, halide, sulphamate and demi-sulphate.
Inventors
- 👤 Eric Nield
- 👤 Sidney R. D. Oldland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492; C08K5/34928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A fire-retardant polyamide composition comprising at least 10% by weight of a polyamide containing a major proportion by weight of hexamethylene adipamide or caprolactam units, wherein said polyamide composition contains from 1 to 90% by weight of a salt derived from melamine or a melamine derivative salt containing at least one --NH 2 group wherein the salt is selected from at least one of the borate, sulphamate and demi-sulphate said salt being sufficiently stable to enable it to be compounded into said polyamide in the molten state without decomposition or volitilisation.
Claim 2
Dependent Claim
91 words
A fire-retardant polyamide composition comprising at least 10% by weight of a polyamide containing a major proportion by weight of hexamethylene adipamide or caprolactam units, wherein said polyamide composition contains from 1 to 90% by weight of a salt derived from melamine or a melamine derivative salt containing at least one --NH 2 group wherein the salt is selected from at least one of the borate, sulphamate and demi-sulphate said salt being sufficiently stable to enable it to be compounded into said polyamide in the molten state without decomposition or volitilisation.
Claim 3
Dependent Claim
29 words
A polyamide composition according to claim 1 wherein the composition contains from 5 to 25% by weight of the salt and at least 50% by weight of the polyamide.
Claim 4
Dependent Claim
19 words
A polyamide composition according to claim 1 wherein the salt is a salt of melamine, melam, melem or melon.
Claim 5
Dependent Claim
28 words
A polyamide composition according to claim 1 wherein the polyamide is a homopolymer of hexamethylene adipamide or hexamethylene caprolactam or a copolymer of hexamethylene adipamide and hexamethylene caprolactam.
Claim 6
Dependent Claim
20 words
A polyamide composition according to claim 1 wherein the salt is melamine demi-sulphate of empirical formula C.sub.3 H.sub.6 N.sub.6.1/2H.sub.2 SO.sub.4.
Claim 7
Dependent Claim
13 words
A polyamide composition according to claim 1 wherein the salt is melamine sulphamate.
Claim 8
Dependent Claim
13 words
A polyamide composition according to claim 1 wherein the salt is melamine borate.
Claim 9
Dependent Claim
32 words
A polyamide composition according to claim 2 having a burning performance as measured on a sample of 1.5 mm thickness using the Vertical Burning Test of Underwriters Laboratories Standard UL94 of VO.
Claim 10
Dependent Claim
24 words
A polyamide composition according to claim 1, wherein said melamine derivative is selected from the group consisting of melam, melem, melon and substituted melamines.
Claim 11
Dependent Claim
30 words
A polyamide composition according to claim 9, wherein said melamine derivative is soluable in water and said salt is capable of being crystallized from an aqueous solution of said derivative.
References Cited (Backward Citations)
CA557874A
Cited
US2032605A
Cited
DE1694254U
Cited
US3660344A
Cited
US3663495A
Cited
DE2031693C
Cited
US3839239A
Cited
US3855138A
Cited
US3819518A
Cited
US4028333A
Cited
FR2364942A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |