Patent US4045512A successfully refreshed from Google Patents.
US4045512A
Expired / Lapsed
US
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Melt blending polyamide process
Assignee: Sunoco Inc R&M
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Filing: 1976-11-26
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Granted: 1977-08-30
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Expires: 1996-11-26
Abstract
Abstract Improved melt blending process for preparing block copolymer of poly(4,7-dioxadecamethylene adipamide)-polycaprolactam, which is also known as N-30203-6//6, involves continuing the melt blending until the polymer is characterized in that the maximum amount of the block copolymer recovered from an aqueous formic acid solution containing the dissolved block copolymer exceeds about 90%. Fiber prepared from such a characterized block copolymer does not fuse when scoured in boiling water.
Inventors
- 👤 Robert M. Thompson
- 👤 Stephen L. Nickol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:58
CPC Classifications
C; C08; C08G; C08G69/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
48 words
In the process of melt-blending poly(4,7-dioxadecamethylene adipamide) and polycaprolactam wherein the improvement comprises continuing the melt blending until the clock copolymer is characterized in that the maximum amount of block copolymer recovered from an aqueous formic acid solution containing the dissolved block copolymer exceeds about 90.6 weight %.
Claim 2
Dependent Claim
48 words
In the process of melt-blending poly(4,7-dioxadecamethylene adipamide) and polycaprolactam wherein the improvement comprises continuing the melt blending until the clock copolymer is characterized in that the maximum amount of block copolymer recovered from an aqueous formic acid solution containing the dissolved block copolymer exceeds about 90.6 weight %.
Claim 3
Dependent Claim
53 words
In the process of melt-blending poly(4,7-dioxadecamethylene adipamide) and polycaprolactam wherein the improvement comprises continuing the melt blending until the block copolymer is characterized in that the formic acid concentration is less than about 52.5% at 50% recovery of the block copolymer dissolved in an aqueous formic acid solution containing the dissolved block copolymer.
Claim 4
Dependent Claim
53 words
In the process of melt-blending poly(4,7-dioxadecamethylene adipamide) and polycaprolactam wherein the improvement comprises continuing the melt blending until the block copolymer is characterized in that the formic acid concentration is less than about 52.5% at 50% recovery of the block copolymer dissolved in an aqueous formic acid solution containing the dissolved block copolymer.
Claim 5
Dependent Claim
38 words
The improvement according to claim 2 wherein in addition the block copolymer is characterized in that the maximum amount of the block copolymer recovered from an aqueous formic acid solution containing the block copolymer exceeds 90.6 weight %.
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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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |