US4255532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic polymer composition for melt-spinning
Assignee: Wyeth Holdings LLC
•
Filing: 1979-02-21
•
Granted: 1981-03-10
•
Expires: 1999-02-21
Abstract
Abstract A combination of a major amount of acrylonitrile and a minor amount of another monomer copolymerizable with acrylonitrile when grafted onto polyvinyl alcohol provides an improved acrylonitrile polymer for preparing fiber by extruding a fusion melt of such polymer and water.
Inventors
- 👤 Shashikumar H. Daftary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:22
CPC Classifications
C; C08; C08F; C08F261/00; C08F261/02; C08F261/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
A polymer comprising repeating units of the structure: ##STR2## wherein R is a grafted poly(vinyl alcohol), R' represents repeating units derived from acrylamido methyl propane sulfonic acid and an acrylic ester selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, methoxymethyl acrylate, beta-chloroethyl acrylate and the corresponding esters of methacrylic acid and chloroacrylic acid, m represents a weight fraction of about 0.01 to 0.10, q+n represents a weight fraction of about 0.80 to 0.89, p+s represents a weight fraction of about 0.01 to 0.19, the units represented by p and n occurring in random order and the kinematic molecular weight of the polymer being from about 30,000 to 60,000.
Claim 2
Dependent Claim
112 words
A polymer comprising repeating units of the structure: ##STR2## wherein R is a grafted poly(vinyl alcohol), R' represents repeating units derived from acrylamido methyl propane sulfonic acid and an acrylic ester selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, methoxymethyl acrylate, beta-chloroethyl acrylate and the corresponding esters of methacrylic acid and chloroacrylic acid, m represents a weight fraction of about 0.01 to 0.10, q+n represents a weight fraction of about 0.80 to 0.89, p+s represents a weight fraction of about 0.01 to 0.19, the units represented by p and n occurring in random order and the kinematic molecular weight of the polymer being from about 30,000 to 60,000.
Claim 3
Dependent Claim
19 words
The polymer of claim 1 wherein R' represents repeating units of methyl methacrylate and acrylamido methyl propane sulfonic acid.
Claim 4
Dependent Claim
13 words
The polymer of claim 1 wherein m represents a weight fraction of 0.035.
Claim 5
Dependent Claim
13 words
The polymer of claim 1 wherein m represents a weight fraction of 0.065.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |