US4247440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing plasticizer bleeding on polyvinyl chloride shaped articles
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1979-07-23
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Granted: 1981-01-27
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Expires: 1999-07-23
Abstract
Abstract In the inventive method, shaped articles of a plasticized polyvinyl chloride resin are subjected to the surface treatment by with low temperature plasma so that the undesirable phenomenon of bleeding of the plasticizer on the surface can be effectively prevented when the plasticizer for plasticizing the resin is a compound having at least one aromatic nucleus in a molecule or a combination of two or more of plasticizers including 10% by weight or more of a plasticizer which is a compound having at least one aromatic nucleus in a molecule.
Inventors
- 👤 Michihiko Asai
- 👤 Yoshio Suda
- 👤 Kiyoshi Imada
- 👤 Susumu Ueno
- 👤 Hirokazu Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:27
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A method for preventing bleeding of a plasticizer on the surface of a shaped article of a polyvinyl chloride resin plasticized with at least 20 parts by weight, per 100 parts by weight of the polyvinyl chloride resin, of a plasticizer which is a compound having at least one aromatic nucleus in a molecule, which method comprises exposing the surface of the shaped article to be treated to a low temperature plasma of an inorganic gas at a pressure in the range from 0.001 to 10 Torr.
Claim 2
Independent Claim
87 words
A method for preventing bleeding of a plasticizer on the surface of a shaped article of a polyvinyl chloride resin plasticized with at least 20 parts by weight, per 100 parts by weight of the polyvinyl chloride resin, of a plasticizer which is a compound having at least one aromatic nucleus in a molecule, which method comprises exposing the surface of the shaped article to be treated to a low temperature plasma of an inorganic gas at a pressure in the range from 0.001 to 10 Torr.
Claim 3
Dependent Claim
27 words
The method as claimed in claim 1, wherein the pressure of the gas for the low temperature plasma is in the range from 0.1 to 1 Torr.
Claim 4
Dependent Claim
19 words
The method as claimed in claim 1 wherein the inorganic gas for the low temperature plasma is carbon monoxide.
Claim 5
Dependent Claim
23 words
The method as claimed in claim 1 wherein the inorganic gas for the low temperature plasma is a mixed gas containing carbon monoxide.
Claim 6
Dependent Claim
34 words
The method as claimed in claim 1 further comprising the step of generating said low temperature plasma by glow discharge at a high frequency power supply in the range of 50 to 150 watts.
Claim 7
Independent Claim
97 words
A method for preventing bleeding of a plasticizer on the surface of a shaped article of a polyvinyl chloride resin plasticized with at least 20 parts by weight per 100 parts by weight of the polyvinyl chloride resin, of a combination of plasticizers including at least 10% by weight of a plasticizer which is a compound having at least one aromatic nucleus in a molecule, which method comprises exposing the surface of the shaped article to be treated to a low temperature plasma of an inorganic gas at a pressure in the range 0.001 to 10 Torr.
Claim 8
Independent Claim
97 words
A method for preventing bleeding of a plasticizer on the surface of a shaped article of a polyvinyl chloride resin plasticized with at least 20 parts by weight per 100 parts by weight of the polyvinyl chloride resin, of a combination of plasticizers including at least 10% by weight of a plasticizer which is a compound having at least one aromatic nucleus in a molecule, which method comprises exposing the surface of the shaped article to be treated to a low temperature plasma of an inorganic gas at a pressure in the range 0.001 to 10 Torr.
Claim 9
Dependent Claim
27 words
The method as claimed in claim 6 wherein the pressure of the gas for the low temperature plasma is in the range from 0.1 to 1 Torr.
Claim 10
Dependent Claim
19 words
The method as claimed in claim 6, wherein the inorganic gas for the low temperature plasma is carbon monoxide.
Claim 11
Dependent Claim
23 words
The method as claimed in claim 6, wherein the inorganic gas for the low temperature plasma is a mixed gas containing carbon monoxide.
Claim 12
Dependent Claim
31 words
The method of claim 6 wherein said plasticizers includes aromatic plasticizers and non-aromatic plasticizers, and the weight ratio of the aromatic plasticizers to the nonaromatic plasticizers ranges from 20:80 to 80:20.
Claim 13
Dependent Claim
34 words
The method as claimed in claim 6 further comprising the step of generating said low temperature plasma by glow discharge at a high frequency power supply in the range of 50 to 150 watts.
Claim 14
Dependent Claim
28 words
The method as claimed in claim 11 wherein said exposing step comprises exposing the surface to a low temperature plasma for a period of 5 to 10 minutes.
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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |