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Patent US3620904A successfully refreshed from Google Patents.
US3620904A
Expired / Lapsed
US
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Highly crimpable polyamide composite filaments
Assignee: SNIA Viscosa SpA
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Filing: 1970-07-23
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Granted: 1971-11-16
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Expires: 1990-07-23
Abstract
Abstract Production of polyamide composite filament having high crimpability, one component of which is polycapramide and the other component of which is a copolyamide consisting of 0.01 to 5 percent by weight of nylon salt composed of a dicarboxylic acid and a polyfunctional diamine having the general formula H2N-(CH2)n-R(CH2)n-NH2 wherein R is > C O and n is 3 to 11, 3 to 20 percent by weight of another nylon salt and 75 to 95 percent by weight of polycapramide forming components.
Inventors
- 👤 Yoshio Tamura
- 👤 Satoshi Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:50
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/12; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
32 words
A filament according to claim 1, wherein the amount of said another nylon salt is 5-15 percent by weight, and the amount of said polycapramide forming component is 83-92 percent by weight.
Claim 2
Dependent Claim
22 words
A filament according to claim 1, wherein the amount of said nylon salt containing the polyfunctional diamine is 0.1-2 percent by weight.
Claim 3
Dependent Claim
29 words
A filament as claimed in claim 1 wherein said polyfunctional diamine is selected from the group consisting of 1,7-diamino-4-heptanone, 1,9-diamino-5-nonanone, 1,11-diamino-6-undecanone, 1, 13-diamino-7-tridecanone, 1,15-diamino-8-pentadecanone, 1,17-diamino-9-heptadecanone, 1,19-diamino-10-nonadecanone, 1,21-diamino-11-heneicosanone and 1,23-diamino-12-tricosanone.
Claim 4
Dependent Claim
55 words
A filament according to claim 1, wherein the dicarboxylic acid is selected from the group consisting of glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, terephthalic acid, isophthalic acid, diphenylether-4,4''-dicarboxylic acid, diphenylene-4,4''-dicarboxylic acid, diphenylmethane-4,4''-dicarboxylic acid diphenylpropane-4,4''-dicarboxylic acid, paraphenylene-diacetic acid, paraphenylene-dipropionic acid, hexahydroterephthalic acid, diphenylethane-4, 4''-dicarboxylic acid and meta- and para-aminomethylbenzoic acid.
Claim 5
Dependent Claim
31 words
A filament according to claim 1, wherein the diamine in said another nylon salts is selected from the group consisting of aliphatic diamines and aromatic diamines other than said polyfunctional diamines.
Claim 6
Dependent Claim
23 words
A filament according to claim 6, wherein said aliphatic diamine is selected from the group consisting of hexamethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine, and piperazine.
Claim 7
Dependent Claim
20 words
A filament according to claim 6, wherein said aromatic diamine is selected from the group consisting of metaxylylenediamine and paraxylylenediamine.
Claim 8
Dependent Claim
18 words
A filament according to claim 1 wherein said another nylon salt consists of an alkylenediamine and isophthalic acid.
Claim 9
Dependent Claim
24 words
A filament according to claim 1, wherein said polycapramide forming component is selected from the group consisting of epsilon -caprolactam anD epsilon -aminocaproic acid.
Claim 10
Dependent Claim
20 words
A filament according to claim 1, wherein said two components are bonded in the conjugate ratio ranging 2:8-8:2 by weight.
Claim 11
Dependent Claim
16 words
A filament according to claim 1, wherein said two components are bonded in a side-by-side relation.
Claim 12
Dependent Claim
19 words
A filament according to claim 1, wherein said two components are bonded in an eccentric core and sheath relation.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |