US4557967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive-coated multifilament yarn of an aromatic polyamide, a yarn package, a cord, a fabric, a reinforced object and a process for making said yarn
Assignee: Akzo NV
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Filing: 1983-11-01
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Granted: 1985-12-10
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Expires: 2003-11-01
Abstract
Abstract A multifilament yarn of an aromatic polyamide, in particular poly-p-phenylene terephthalamide, is provided with an adhesive coating of a cured epoxy compound, the yarn having a free epoxide content not higher than 10 mmoles/kg. The yarn is made by spinning a solution of an aromatic polyamide into a coagulation bath and subjecting the resulting filaments to the subsequent steps of washing, applying a curable epoxy compound and one or more alkaline curing agents, curing and winding the yarn thus treated into a package. The resulting yarn can be processed into a reinforcing element for, e.g., tires in a one-step dipping process. A cord made from the yarn displays an improved resorcinol-formaldehyde-latex dip pickup.
Inventors
- 👤 Stephanus Willemsen
- 👤 Willem E. Weening
- 👤 Anne Steenbergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:05
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; D; D01; D01F; D01F11/00; D01F11/04; D01F11/08; D02; D02G; D02G3/00; D02G3/22; D02G3/40; D02G3/44; D02G3/447; C08J2321/00; D10; D10B; D10B2331/00; D10B2331/02; D10B2331/021; Y; Y10; Y10S; Y10S156/00; Y10S156/91; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852; Y10T428/2861; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/31504; Y10T428/31511; Y10T428/31826; Y10T442/00; Y10T442/30; Y10T442/3049; Y10T442/3057; Y10T442/60; Y10T442/603; Y10T442/607
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
60 words
A multifilament yarn which consists of an aromatic polyamide and is provided with an adhesive coating of a cured epoxy compound, characterized in that the yarn has a free epoxide content not higher than 10 mmoles/kg, the epoxide compound having been applied to the yarn and cured while the yarn has a twist of fewer than 10 turns per meter.
Claim 2
Dependent Claim
60 words
A multifilament yarn which consists of an aromatic polyamide and is provided with an adhesive coating of a cured epoxy compound, characterized in that the yarn has a free epoxide content not higher than 10 mmoles/kg, the epoxide compound having been applied to the yarn and cured while the yarn has a twist of fewer than 10 turns per meter.
Claim 3
Dependent Claim
18 words
A yarn according to claim 1, characterized in that the free epoxide content is lower than 2 mmoles/kg.
Claim 4
Dependent Claim
19 words
A yarn according to claim 1, characterized in that the yarn has a stiffness number lower than 3000 N/tex.
Claim 5
Dependent Claim
15 words
A yarn according to claim 1, characterized in that the yarn consists of poly-p-phenylene terephthalamide.
Claim 6
Dependent Claim
21 words
A yarn according to claim 1, characterized in that the yarn has a twist of fewer than 10 turns per meter.
Claim 7
Dependent Claim
29 words
A yarn according to claim 1, characterized in that the adhesive coating is obtained by curing a mixture comprising an epoxy compound and one or more alkaline curing agents.
Claim 8
Dependent Claim
27 words
A yarn according to claim 6, characterized in that the adhesive coating is obtained by curing a mixture comprising a diglycidyl ether of glycerol and an amine.
Claim 9
Dependent Claim
13 words
A yarn according to claim 7, characterized in that the amine is piperazine.
Claim 10
Dependent Claim
29 words
A yarn according to claim 6, characterized in that the adhesive coating is obtained by curing a mixture comprising the diglycidyl ether of glycerol, piperazine, imidazole and ethylene glycol.
Claim 11
Dependent Claim
25 words
A yarn according to claim 1, characterized in that the yarn contains 0.3-1% by weight of the adhesive coating consisting of a cured epoxy compound.
Claim 12
Dependent Claim
30 words
A yarn according to claim 1, characterized in that the yarn is also provided with 0.1-5% by weight of one or more polyglycol esters of one or more fatty acids.
Claim 13
Dependent Claim
22 words
A yarn according to claim 11, characterized in that the yarn contains 0.3-1.0% by weight of a polyglycol ester of oleic acid.
Claim 14
Dependent Claim
53 words
A yarn package, characterized in that it contains a continuous yarn length of a multifilament yarn consisting of poly-p-phenylene terephthalamide, which yarn has a twist of fewer than 10 turns per meter, provided with an adhesive coating of a cured epoxy compound and has a free epoxide content of less than 2 mmoles/kg.
Claim 15
Dependent Claim
53 words
A yarn package, characterized in that it contains a continuous yarn length of a multifilament yarn consisting of poly-p-phenylene terephthalamide, which yarn has a twist of fewer than 10 turns per meter, provided with an adhesive coating of a cured epoxy compound and has a free epoxide content of less than 2 mmoles/kg.
Claim 16
Dependent Claim
10 words
A fabric made of a yarn according to claim 1.
Claim 17
Dependent Claim
16 words
A fibre-reinforced object, of which the reinforcing material consists of a yarn, according to claim 1.
References Cited (Backward Citations)
GB1025310A
Cited
GB1035299A
Cited
US4259404A
Cited
US4121901A
Cited
US4368615A
Cited
US4343843A
Cited
US4455341A
Cited
US4409055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |