US3717689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the antistatic properties of hydrophobic synthetic fibers
Assignee: Toray Industries Inc
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Filing: 1971-09-20
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Granted: 1973-02-20
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Expires: 1991-09-20
Abstract
Abstract The antistatic properties of hydrophobic synthetic fibers are improved by treatment with an aqueous mixture containing at least one copolymer prepared by copolymerization of a mixture of (I) monoester selected from alkoxy-polyalkyleneglycol-acrylates or alkoxy-polyalkylene-glycol-methacrylates and (II) diester selected from diacrylates and dimethacrylates of polyols. An improvement in the treatment is made by addition of (III) acrylonitrile or vinyl esters of alkyl-alcohols with more than 8 carbon atoms to the copolymerization mixture in order to increase the durability of the antistatic properties of the fibers as a result of laundering and dry cleaning, and to improve the handling qualities.
Inventors
- 👤 H Tanaka
- 👤 K Yuki
- 👤 H Aotani
- 👤 M Shimamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/263; D06M15/267; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; C08F220/285; C08F220/286; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17; Y10S260/21
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
205 words
A process of improving the antistatic property of hydrophobic synthetic fibers comprising impregnating said fibers with an aqueous liquid containing at least one copolymer which is prepared by copolymerizing, in water, a mixture of I. a monoester of the formula wherein R1 is selected from the group consisting of H, CH3 and C2H5, R2 is selected from the group consisting of OH, alkoxy containing not more than 18 carbon atoms, halogen, alkyl sulfide containing not more than 18 carbon atoms, a mono- or dialkylamine containing not more than 18 carbon atoms, phenoxy and naphthoxy, and l and m are satisfied with the formulas 10 < or = l < or = 100 and O < or = m <l and II. a diester selected from diacrylates and dimethacrylates of polyols in a proportion such that the gelating concentration of said mixture is 14 to 30 percent, the gelating concentration being the minimum concentration with respect to the total weight of the copolymerization system required to cause gelation of a mixture of about 20 cc. of a combination of said monoester and said diester dissolved in dimethyl sulfoxide containing 0.2 g./l. of sulfuric acid and 0.02 g./l. of azobisisobutylnitrile when heated at 55*C. for 24 hours.
Claim 2
Dependent Claim
205 words
A process of improving the antistatic property of hydrophobic synthetic fibers comprising impregnating said fibers with an aqueous liquid containing at least one copolymer which is prepared by copolymerizing, in water, a mixture of I. a monoester of the formula wherein R1 is selected from the group consisting of H, CH3 and C2H5, R2 is selected from the group consisting of OH, alkoxy containing not more than 18 carbon atoms, halogen, alkyl sulfide containing not more than 18 carbon atoms, a mono- or dialkylamine containing not more than 18 carbon atoms, phenoxy and naphthoxy, and l and m are satisfied with the formulas 10 < or = l < or = 100 and O < or = m <l and II. a diester selected from diacrylates and dimethacrylates of polyols in a proportion such that the gelating concentration of said mixture is 14 to 30 percent, the gelating concentration being the minimum concentration with respect to the total weight of the copolymerization system required to cause gelation of a mixture of about 20 cc. of a combination of said monoester and said diester dissolved in dimethyl sulfoxide containing 0.2 g./l. of sulfuric acid and 0.02 g./l. of azobisisobutylnitrile when heated at 55*C. for 24 hours.
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein said hydrophobic synthetic fiber is polyacrylonitrile fiber.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein said polyacrylonitrile fiber is in an aquagel condition.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein said impregnated fibers are steamed at a temperature above 90*C. before said drying.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein said dried fiber absorbs 0.1 to 8 percent of said copolymer based on the weight of said fiber.
Claim 7
Dependent Claim
24 words
A process according to claim 5 wherein said absorption of said copolymer is 0.2 to 2.0 percent based on the weight of said fiber.
Claim 8
Dependent Claim
27 words
A process according to claim 1 wherein the copolymerization mixture further contains 5 to 45 percent of acrylonitrile based on the total weight of said copolymerization mixture.
Claim 9
Dependent Claim
46 words
A process according to claim 1 wherein the copolymerization mixture contains 20 to 60 percent of at least one monomer selected from acrylic and methacrylic esters of a higher alkyl alcohol having more than 8 carbon atoms, based on the total weight of said copolymerization mixture.
Claim 10
Dependent Claim
44 words
A process according to claim 1 wherein said copolymer has a specific viscosity of 0.3 to 1.0 in a dispersion containing 0.1 percent by weight of said copolymer, said specific viscosity being determined at a temperature of 30*C. by means of an Ostwald viscometer.
Claim 11
Dependent Claim
47 words
A process according to claim 1 wherein the copolymerization mixture contains 20 to 60 percent of at least one monomer selected from acrylic and methacrylic esters of a higher alkyl alcohol having from eight to 18 carbon atoms, based on the total weight of said copolymeriZation mixture.
Claim 12
Dependent Claim
19 words
A process according to claim 1 in which in the formula of said monoester, 20 < l < 70.
Claim 13
Dependent Claim
20 words
A hydrophobic fiber having improved antistatic properties which has been treated in accordance with the process defined in claim 1.
Claim 14
Dependent Claim
19 words
A hydrophobic fiber having improved antistatic properties which has been treated in accordance with the process in claim 7.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |