US4208317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flameproofed plastic compositions
Assignee: Rhone Poulenc Industries SA
•
Filing: 1978-03-23
•
Granted: 1980-06-17
•
Expires: 1998-03-23
Abstract
Abstract Compositions for the flameproofing of plastics, said compositions containing from 0.1% to 20% by weight, relative to the plastic, of red phosphorus in the form of particles having a mean diameter less than 200μ, encapsulated in a polymer which does not have a melting point or softening point below 90° C., and which has a molecular weight greater than 2,000.
Inventors
- 👤 Jacqueline Cerny
- 👤 Gilbert Vivant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:44
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K9/00; C08K9/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
Plastic based compositions flameproofed with 0.1% to 20% by weight, relative to the plastic, of red phosphorus in the form of particles having a mean diameter of less than 200 μ, and encapsulated in a polymer which does not have a melting point or softening point below 90° C. and has a mean molecular weight greater than 2,000 and in which the polymer is present in an amount within the range of 5 to 80% by weight of the red phosphorus.
Claim 2
Dependent Claim
81 words
Plastic based compositions flameproofed with 0.1% to 20% by weight, relative to the plastic, of red phosphorus in the form of particles having a mean diameter of less than 200 μ, and encapsulated in a polymer which does not have a melting point or softening point below 90° C. and has a mean molecular weight greater than 2,000 and in which the polymer is present in an amount within the range of 5 to 80% by weight of the red phosphorus.
Claim 3
Dependent Claim
41 words
Compositions as claimed in claim 1 which contain up to 100% by weight, relative to the coated phosphorus, of a metal oxide selected from the group consisting of the oxides of copper, zinc, silver, iron, antimony, magnesium, vanadium, tin and titanium.
Claim 4
Dependent Claim
50 words
Compositions as claimed in claim 1 in which the polymers encapsulating the red phosphorus particles are selected from the group consisting of the polycarbonates, the polyamides, the polyesters, the polyolefins, the polymers derived from acrylic acid or acrylates, the polytetrafluoroethylenes, the silicones, the polyimide-amides, the phenolic resins, and the polyimides.
Claim 5
Dependent Claim
12 words
Compositions as claimed in claim 1 which include glass fibers as reinforcement.
Claim 6
Dependent Claim
10 words
Compositions as claimed in claim 1 which contain inert fillers.
Claim 7
Dependent Claim
21 words
Compositions as claimed in claim 5 in which the inert filler is selected from the group consisting of kaolin and talc.
References Cited (Backward Citations)
US3336155A
Cited
US3386851A
Cited
US3477982A
Cited
US3627780A
Cited
US3691195A
Cited
US3897586A
Cited
US3847861A
Cited
US3962491A
Cited
US3883475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |