Patent US4034138A successfully refreshed from Google Patents.
US4034138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyamide fibers coated with a polyurethane
Assignee: BP Chemicals Hitco Inc
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Filing: 1975-10-09
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Granted: 1977-07-05
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Expires: 1995-10-09
Abstract
Abstract A high-strength, low weight, electromechanical cable is disclosed. The cable is formed by polyamide multifilaments impregnated with a hydrolytically stable polyurethane to form a protective coating. The coating provides load adjustment from fiber to fiber, eliminates abrasive self-destruction of the fibers during flexing of the yarn under load, protects the fiber to some extent from ultraviolet radiation, aggressive chemicals or abrasive particles and makes it possible to preform the yarn. The coating comprises a reaction product of a liquid tetramethylene glycol, an aliphatic/cycloaliphatic diisocyanate and a diamine coupling-curing agent. The impregnated fibers are dried, twisted and then heated to the melting temperature of the coating.
Inventors
- 👤 Eduard P. Babayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:02
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
44 words
An article of manufacture comprising high modulus multifilaments of synthetic, aromatic polyamide fibers impregnated and coated with 5-95% by weight of a thermoplastic polyurethane resin comprising the reaction product of: a liquid polytetramethylene ether glycol; an aliphatic diisocyanate; and an aliphatic diamine coupling-curing agent.
Claim 2
Dependent Claim
44 words
An article of manufacture comprising high modulus multifilaments of synthetic, aromatic polyamide fibers impregnated and coated with 5-95% by weight of a thermoplastic polyurethane resin comprising the reaction product of: a liquid polytetramethylene ether glycol; an aliphatic diisocyanate; and an aliphatic diamine coupling-curing agent.
Claim 3
Dependent Claim
42 words
An article in accordance with claim 1 in which the resin impregnation is from 15-40% by weight of a polyurethane reaction product of a polytetramethylene ether glycol having a molecular weight from 500 to 3,000 an aliphatic-cycloaliphatic diisocyanate and a cycloaliphatic diamine.
Claim 4
Dependent Claim
19 words
An article according to claim 2 in which the diisocyanate is isophorone diisocyanate and the diamine is isophorone diamine.
Claim 5
Dependent Claim
24 words
An article according to claim 2 in which a plurality of said impregnated multifilaments are joined together by fusion of said thermoplastic impregnated coatings.
Claim 6
Dependent Claim
35 words
An article according to claim 1 in which the diisocyanate is a compound of the formula: ##STR3## where R 1 is alkylene of 1-10 carbon atoms and n is an integer from 4 to 10.
Claim 7
Dependent Claim
32 words
An article according to claim 5 in which the diisocyanate is a compound of the formula: ##STR4## where R 3 is lower alkyl and R 1 is alkylene of 1-10 carbon atoms.
Claim 8
Dependent Claim
17 words
An article according to claim 6 in which R 3 is methyl and R 1 is methylene.
Claim 9
Dependent Claim
14 words
An article according to claim 6 in which the diamine is a cycloaliphatic diamine.
Claim 10
Dependent Claim
13 words
An article according to claim 8 in which the diamine is isophorone diamine.
Claim 11
Dependent Claim
23 words
An article according to claim 9 in which the resin contains 1-5 phr of a drying agent and 1-10 phr of silicate fillers.
References Cited (Backward Citations)
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US3549569A
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US3609112A
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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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |