US4095404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a high-strength, polyurethane-impregnated polyamide cable
Assignee: Fiberite Inc
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Filing: 1977-04-25
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Granted: 1978-06-20
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Expires: 1997-04-25
Abstract
Abstract A high-strength, low weight, electromechanical cable is manufactured from aromatic polyamide multifilament yarns impregnated with a hydrolytically stable polyurethane resin 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 yarns are dried, twisted together, heated above the softening point of the resin to fuse the coatings of adjacent yarns, and then cooled to form a set twisted helix of the yarns.
Inventors
- 👤 Eduard P. Babayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:20
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; D07; D07B; D07B1/00; D07B1/02; D07B1/025; D07B2201/00; D07B2201/10; D07B2201/104; D07B2201/20; D07B2201/2015; D07B2201/2042; D07B2201/2044; D07B2205/00; D07B2205/20; D07B2205/2046; D07B2205/205; D07B2205/2064; D07B2207/00; D07B2207/40; D07B2207/404
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A method of manufacturing a high-strength, lightweight cable comprising the steps of: impregnating high modulus, multifilament, aromatic polyamide yarns with a solution of thermoplastic resin to a level of 15 to 40% by weight of resin, said resin being a hydrolytically stable, solvent soluble polyurethane comprising the stoichiometric reaction product of: a liquid polytetramethylene glycol having a molecular weight from 500 to 3,000; an aliphatic-cycloaliphatic diisocyanate of the formula: ##STR3## where R 1 is alkylene of 1-10 carbon atoms and n is an integer from 4 to 10; a cycloaliphatic diamine coupling-curing agent; drying said impregnated yarns to form a resin coating thereon; twisting a plurality of individual dried yarns into a continuous helix assembly; heating the twisted yarn assembly to a temperature above the softening point of the resin to fuse the coatings of adjacent yarns; and cooling the heated assembly to form a set twisted helix of said yarns.
Claim 2
Independent Claim
151 words
A method of manufacturing a high-strength, lightweight cable comprising the steps of: impregnating high modulus, multifilament, aromatic polyamide yarns with a solution of thermoplastic resin to a level of 15 to 40% by weight of resin, said resin being a hydrolytically stable, solvent soluble polyurethane comprising the stoichiometric reaction product of: a liquid polytetramethylene glycol having a molecular weight from 500 to 3,000; an aliphatic-cycloaliphatic diisocyanate of the formula: ##STR3## where R 1 is alkylene of 1-10 carbon atoms and n is an integer from 4 to 10; a cycloaliphatic diamine coupling-curing agent; drying said impregnated yarns to form a resin coating thereon; twisting a plurality of individual dried yarns into a continuous helix assembly; heating the twisted yarn assembly to a temperature above the softening point of the resin to fuse the coatings of adjacent yarns; and cooling the heated assembly to form a set twisted helix of said yarns.
Claim 3
Dependent Claim
37 words
A method according to claim 1 further including the step of passing said heated, twisted yarns through a heated, circular, sizing die before cooling to remove excess resin and to conform the outside circularity of the assembly.
Claim 4
Dependent Claim
16 words
A method according to claim 1 in which the yarns are placed in tension during twisting.
Claim 5
Dependent Claim
13 words
A method according to claim 1 in which the diamine is isophorone diamine.
Claim 6
Dependent Claim
32 words
A method according to claim 1 in which the resin further includes 0.1 to 0.5 phr of a curing catalyst, 1-5 phr of a drying agent, and 1-10 phr of silicate fillers.
Claim 7
Dependent Claim
22 words
A method according to claim 1 in which the resin is dissolved in a mixture of an aromatic, ketone and alkanol solvent.
Claim 8
Dependent Claim
18 words
A method according to claim 6 in which the solvent mixture comprises xylene, methyl ethyl ketone and isopropanol.
Claim 9
Dependent Claim
32 words
A method according to claim 1 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 10
Dependent Claim
17 words
A method according to claim 8 in which R 3 is methyl and R 1 is methylene.
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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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |