US4038237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire retardant wire coating
Assignee: Shell USA Inc
•
Filing: 1976-06-17
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Granted: 1977-07-26
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Expires: 1996-06-17
Abstract
Abstract A fire-resistant polymer composition is disclosed which is useful in coating electrical conductors. The composition comprises a block copolymer, extending oil, polymeric alpha-olefin, fire retardants and a calcium sulfate filler.
Inventors
- 👤 John L. Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:26
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08K; C08K13/00; C08K13/02; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/30; C08K5/00; C08K5/02; C08L53/00; C08L53/02; C08L53/025; C08L91/00; C08K3/2279; C08K5/01; C08L2201/00; C08L2201/02; C08L23/10; C08L23/12; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A fire-resistant polymer composition comprising: a. 100 parts by weight of a block copolymer having at least two polymer end blocks A and at least one polymer mid block B, each block A being a non-elastomeric polymer block of a monoalkenyl arene having an average molecular weight of between about 2,000 and about 125,000 and having no more than 25% of the aromatic double bonds being reduced by hydrogenation, and each block B being an elastomeric hydrogenated polymer block of a conjugated diene, having an average molecular weight between about 10,000 and about 250,000; b. 0-200 parts by weight of an extending oil; c. 10-300 parts by weight of a polymeric alpha-olefin; d. 5-100 parts by weight of antimony trioxide; e. 25-200 parts by weight of a chlorinated hydrocarbon; and f. 50-300 parts by weight of a calcium sulfate filler.
Claim 2
Dependent Claim
140 words
A fire-resistant polymer composition comprising: a. 100 parts by weight of a block copolymer having at least two polymer end blocks A and at least one polymer mid block B, each block A being a non-elastomeric polymer block of a monoalkenyl arene having an average molecular weight of between about 2,000 and about 125,000 and having no more than 25% of the aromatic double bonds being reduced by hydrogenation, and each block B being an elastomeric hydrogenated polymer block of a conjugated diene, having an average molecular weight between about 10,000 and about 250,000; b. 0-200 parts by weight of an extending oil; c. 10-300 parts by weight of a polymeric alpha-olefin; d. 5-100 parts by weight of antimony trioxide; e. 25-200 parts by weight of a chlorinated hydrocarbon; and f. 50-300 parts by weight of a calcium sulfate filler.
Claim 3
Dependent Claim
43 words
A composition according to claim 1 wherein the calcium sulfate filler is selected from the group consisting of the anhydrous salt, CaS0 4 ; the dihydrate, CaS0 4 × 2H 2 0; the hemihydrate, CaS0 4 × 0.5H 2 0; and mixtures thereof.
Claim 4
Dependent Claim
18 words
A composition according to claim 1 wherein the calcium sulfate employed is the anyhdrous salt CaS0 4 .
Claim 5
Dependent Claim
18 words
A composition according to claim 1 wherein the A block is styrene and the conjugated diene is butadiene.
Claim 6
Dependent Claim
13 words
A composition according to claim 1 wherein the polymeric alpha-olefin is isotactic polypropylene.
Claim 7
Dependent Claim
15 words
A composition according to claim 1 wherein the chlorinated hydrocarbon is an adduct of hexachlorocyclopentadiene.
Claim 8
Dependent Claim
22 words
A composition according to claim 1 where the amount of extending oil varies from about 50 to about 100 parts by weight.
Claim 9
Dependent Claim
33 words
A composition according to claim 1 wherein the molecular weight of the A blocks are between about 5,000 and 50,000 and the molecular weight of the B blocks are between 30,000 and 150,000.
References Cited (Backward Citations)
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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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |