Patent US4059560A successfully refreshed from Google Patents.
US4059560A
Expired / Lapsed
US
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Smoke and flame retarded styrene polymers
Assignee: Bridgestone Firestone Inc
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Filing: 1976-05-05
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Granted: 1977-11-22
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Expires: 1996-05-05
Abstract
Abstract The evolution of smoke and the development of flame are retarded by the incorporation of hydrated magnesium oxychloride into organic polymers which contain aromatic components, particularly polymers and copolymers of styrene. The hydrated magnesium oxychloride has the added advantage that it has low tinting strength, i.e., does not greatly change the color or appearance of the polymers.
Inventors
- 👤 David Francis Lawson
- 👤 Edward Leo Kay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:55
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/16; Y; Y10; Y10S; Y10S521/00; Y10S521/903; Y10S521/907
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
A smoke and flame inhibited composition containing (a) 100 parts by weight of a polymeric material selected from butadiene-styrene elastomer, high impact polystyrene, polystyrene and copolymers of styrene with a monoethylenically unsaturated nitrile, (b) 30-200 parts hydrated magnesium oxychloride per 100 parts said polymer, said copolymer containing at least 10% by weight aromatic groups derived from styrene.
Claim 2
Dependent Claim
57 words
A smoke and flame inhibited composition containing (a) 100 parts by weight of a polymeric material selected from butadiene-styrene elastomer, high impact polystyrene, polystyrene and copolymers of styrene with a monoethylenically unsaturated nitrile, (b) 30-200 parts hydrated magnesium oxychloride per 100 parts said polymer, said copolymer containing at least 10% by weight aromatic groups derived from styrene.
Claim 3
Dependent Claim
14 words
A composition according to claim 1 wherein said polymeric material is high impact polystyrene.
Claim 4
Dependent Claim
13 words
A composition according to claim 1 wherein said polymeric material is butadiene-styrene elastomer.
Claim 5
Dependent Claim
12 words
A composition according to claim 1 wherein said polymeric material is polystyrene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |