US4187207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flameproofed polyamide containing red phosphorous
Assignee: Rhone Poulenc Industries SA
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Filing: 1977-10-11
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Granted: 1980-02-05
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Expires: 1997-10-11
Abstract
Abstract Polyamides flameproofed with red phosphorous and including cadmium oxide as an additive to retard the formation of phosphine during heating are disclosed. The polyamides are particularly useful in the manufacture of electrical components.
Inventors
- 👤 Jacqueline Cerny
- 👤 Robert Troncy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:55
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/18; C08K3/20; C08K3/22; C08K3/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A composition of matter comprising a polyamide, an amount of red phosphorous sufficient to flameproof said polyamide and an amount of cadmium oxide sufficient to retard the liberation of phosphine during heating of said polyamide.
Claim 2
Dependent Claim
35 words
A composition of matter comprising a polyamide, an amount of red phosphorous sufficient to flameproof said polyamide and an amount of cadmium oxide sufficient to retard the liberation of phosphine during heating of said polyamide.
Claim 3
Dependent Claim
29 words
The composition as defined by claim 1, containing 0.2 to 25% red phosphorous and 0.2 to 20% cadmium oxide by weight based upon the total weight of the composition.
Claim 4
Dependent Claim
30 words
The composition as defined by claim 1, further comprising reinforcing fillers selected from the group consisting of glass fibers, asbestos fibers, glass microspheres, kaolin, talc, silica, micas, bentonites and bentones,
Claim 5
Dependent Claim
31 words
The composition as defined by claim 3, wherein said reinforcing fillers are glass fibers present in quantities from 20 to 50% by weight based upon the total weight of the composition.
Claim 6
Dependent Claim
22 words
The composition as defined by claim 1, wherein the red phosphorous is in the form of particles coated with a phenol-formaldehyde prepolycondensate.
Claim 7
Dependent Claim
9 words
A shaped article comprising the composition of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |