Patent US4022756A successfully refreshed from Google Patents.
US4022756A
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Dimensionally stable 6TA/6IA fibers
Assignee: Monsanto Co
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Filing: 1975-04-09
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Granted: 1977-05-10
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Expires: 1995-04-09
Abstract
Abstract Dimensionally stable fibers are produced from copolymers prepared from substantially equimolar amounts of hexamethylene diamine and a 50:50 to 80:20 mixture of terephthalic and isophthalic acids by heating essentially amorphous fibers melt spun from the copolymers to a temperature between about 160 DEG C. and 300 DEG C. for a short period of time. The dimensionally stable fibers combine many of the best properties of nylon 66 and poly(ethylene terephthalate) and are particularly useful in tire and textile applications.
Inventors
- 👤 Richard D. Chapman
- 👤 Donald A. Holmer
- 👤 Oscar A. Pickett, Jr.
- 👤 James H. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:40
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
A molecularly oriented and annealed dimensionally stable fiber of a copolyamide consisting essentially of recurring units of the formulas ##STR3## wherein the mole ratio of units (I) to units (II) is between 50:50 and 80:20, said fiber being characterized in having a boiling water shrinkage value of 1.65% up to less than 10%.
Claim 2
Dependent Claim
53 words
A molecularly oriented and annealed dimensionally stable fiber of a copolyamide consisting essentially of recurring units of the formulas ##STR3## wherein the mole ratio of units (I) to units (II) is between 50:50 and 80:20, said fiber being characterized in having a boiling water shrinkage value of 1.65% up to less than 10%.
Claim 3
Dependent Claim
20 words
The fiber of claim 1, wherein the mole ratio of units (I) to units (II) is from 60:40 to 70:30.
Claim 4
Dependent Claim
16 words
The fiber of claim 2 having a boiling water shrinkage value of between 2 and 8%.
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |