US4364970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving surface properties of shaped articles of polyvinyl chloride resins
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1981-06-23
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Granted: 1982-12-21
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Expires: 2001-06-23
Abstract
Abstract A novel method is proposed for improving the surface properties or, in particular, for reducing accumulation of static electricity on the surface of a shaped article of a vinyl chloride-based resin. The inventive method comprises first exposing the surface of the shaped article to low temperature plasma of a gas having no polymerizability in plasma and then bringing the plasma-treated surface into contact with a liquid which is inert to the resin, e.g. water, or an aqueous solution containing a surface active agent. The effect of the inventive method is so strong and durable that the treated surface remains anti-static even after 12 months after the treatment.
Inventors
- 👤 Kiyoshi Imada
- 👤 Tokuji Abe
- 👤 Susumu Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:55
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B29; B29C; B29C59/00; B29C59/14; G; G11; G11B; G11B3/00; G11B3/68; G11B3/70; G11B3/705; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A method for improving surface properties of a shaped article of a vinyl chloride-based resin which comprises (a) exposing the surface of the shaped article to low temperature plasma of a gas having no polymerizability in the plasma condition, and (b) contacting the plasma-treated surface of the shaped article with an aqueous solution which is devoid of any film forming component, is inert to and does not dissolve or swell the vinyl chloride-based resin and which contains a surface active agent, within 24 hours after the termination of the exposure to the plasma for at least 1 second and then rinsing and drying the thus contacted article.
Claim 2
Independent Claim
107 words
A method for improving surface properties of a shaped article of a vinyl chloride-based resin which comprises (a) exposing the surface of the shaped article to low temperature plasma of a gas having no polymerizability in the plasma condition, and (b) contacting the plasma-treated surface of the shaped article with an aqueous solution which is devoid of any film forming component, is inert to and does not dissolve or swell the vinyl chloride-based resin and which contains a surface active agent, within 24 hours after the termination of the exposure to the plasma for at least 1 second and then rinsing and drying the thus contacted article.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein the contacting is carried out at a temperature from about 0° to 50° C. for a time period of from 1 second to several minutes.
Claim 4
Dependent Claim
25 words
The method as claimed in claim 1 wherein the gas having no polymerizability in the plasma condition is argon or a mixed gas containing argon.
Claim 5
Dependent Claim
13 words
The method as claimed in claim 1 wherein the aqueous solution comprises water.
Claim 6
Dependent Claim
41 words
The method as claimed in claim 1 wherein the length of the time in which the plasma-treated surface of the shaped article is in contact with the liquid which is inert to the vinyl chloride-based resin is at least 1 second.
Claim 7
Dependent Claim
18 words
The method as claimed in claim 1 wherein the surface active agent is a cationic surface active agent.
Claim 8
Dependent Claim
29 words
The method as claimed in claim 1 wherein the concentration of the surface active agent in the aqueous solution is in the range from 0.1% to 10% by weight.
Claim 9
Dependent Claim
33 words
The method as claimed in claim 1 wherein the shaped article after contacting with the aqueous solution containing a surface active agent is rinsed and dried at a temperature lower than 80° C.
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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |