US3896204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-extrusion of acrylonitrile polymers into filaments
Assignee: EIDP Inc
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Filing: 1972-10-02
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Granted: 1975-07-22
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Expires: 1992-10-02
Abstract
Abstract Compositions which are substantially single phase partial or complete hydrates of an acrylonitrile polymer can be extruded into filaments within a certain elevated temperature range. Extrusion is facilitated, and properties of the article extruded are enhanced, by the addition to the extrusion mixture of a small amount of a compatible solvent for the polymer.
Inventors
- 👤 Albert Goodman
- 👤 Mark A Suwyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:59
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; D01F6/44; D01F6/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
IN THE PROCESS FRO PREPARING ACRYLONITRILE POLYMER FILAMENTS, THE IMPROVEMENT FOR PROVIDING BETTER LOOP TENACITIES WHICH COMPRISES MIXING AND HEATING TO FORM A SUBSTANTIALLY SINGLE PHASE COMPOSTION OF (A) ONE OR MORE ACRYLONITRILE POLYMERS WHICH CONTAIN AT LEAST 40 WEIGHT PERCENT ACRYLONITRILE UNITS, (B) ABOUT 0.5 TO ABOUT 10 PARTS BY WEIGHT OF A COMPATIBLE SOLVENT PER 100 PARTS BY WEIGH OF POLYMER, AND (C) AN AMOUNT OF WATER WHICH IS BETWEEN 45 AND 100 PERCENT BY WEIGHT OF THE MINIMUM AMOUNT REQUIRED TO HYDRATE ALL OF THE NITRILE GROUPS PRESENT IN THE POLYMER, WITH THE PROVISO THAT THERE IS SUFFICIENT WATER TO HYDRATE AT LEAST 8000 PERCENT OF ANY COUPLED NITRILE GROUPS PRESENT, EXTRUDING THE SUBSTANTIALLY SINGLE PHASE COMPOSITION UNDER AT LEAST AUTOGENOUS PRESSURE
Claim 2
Dependent Claim
125 words
IN THE PROCESS FRO PREPARING ACRYLONITRILE POLYMER FILAMENTS, THE IMPROVEMENT FOR PROVIDING BETTER LOOP TENACITIES WHICH COMPRISES MIXING AND HEATING TO FORM A SUBSTANTIALLY SINGLE PHASE COMPOSTION OF (A) ONE OR MORE ACRYLONITRILE POLYMERS WHICH CONTAIN AT LEAST 40 WEIGHT PERCENT ACRYLONITRILE UNITS, (B) ABOUT 0.5 TO ABOUT 10 PARTS BY WEIGHT OF A COMPATIBLE SOLVENT PER 100 PARTS BY WEIGH OF POLYMER, AND (C) AN AMOUNT OF WATER WHICH IS BETWEEN 45 AND 100 PERCENT BY WEIGHT OF THE MINIMUM AMOUNT REQUIRED TO HYDRATE ALL OF THE NITRILE GROUPS PRESENT IN THE POLYMER, WITH THE PROVISO THAT THERE IS SUFFICIENT WATER TO HYDRATE AT LEAST 8000 PERCENT OF ANY COUPLED NITRILE GROUPS PRESENT, EXTRUDING THE SUBSTANTIALLY SINGLE PHASE COMPOSITION UNDER AT LEAST AUTOGENOUS PRESSURE
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said component (a) of the composition contains at least 80 weight percent acrylonitrile units.
Claim 4
Dependent Claim
32 words
The process of claim 2 wherein said component (b) of the composition is between about 3 and 7 parts by weight of a compatible solvent per 100 parts by weight of polymer.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein said compatible solvent is ethylene carbonate.
Claim 6
Dependent Claim
11 words
The process of claim 3 wherein said compatible solvent is 2-pyrrolidone.
Claim 7
Dependent Claim
12 words
The process of claim 3 wherein said compatible solvent is tetramethylene sulfone.
Claim 8
Dependent Claim
11 words
The process of claim 3 wherein said compatible solvent is acetonitrile.
Claim 9
Dependent Claim
19 words
The process of claim 3 wherein the acrylonitrile polymer is an acrylic polymer which contains methyl acrylate polymer units.
Claim 10
Dependent Claim
37 words
The process of claim 3 wherein the acrylonitrile polymer is a homopolymer of acrylonitrile, or a copolymer of acrylonitrile, sodium styrenesulfonate and either methyl methacrylate, vinyl acetate, styrene, or a mixture of two or three of them.
Claim 11
Dependent Claim
13 words
The process of claim 1 wherein the acrylonitrile polymer is an acrylic polymer.
References Cited (Backward Citations)
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US3634575A
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US3655857A
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US3669919A
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US3770856A
Cited
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US3774384A
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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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |