US4247496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the surface of plastic materials
Assignee: Toray Industries Inc
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Filing: 1979-04-17
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Granted: 1981-01-27
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Expires: 1999-04-17
Abstract
Abstract The present invention relates to a method for improving the surface of plastic materials, particularly plastic films. The new method comprises stretching the film at least in one direction during or after irradiation with the ultra-violet light.
Inventors
- 👤 Ken-Ichi Kawakami
- 👤 Shoji Saito
- 👤 Shizuo Togashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:33
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/16; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0827; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2067/00; B29K2995/00; B29K2995/0037; B29K2995/005; B29K2995/0051
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A method of imparting a slippery surface to a film of polypropylene or polyethylene terephthalate which comprises both stretching said film and subjecting said film to ultraviolet light of an irradiation energy of about 1 to 10 Joule per cm 2 in the case of polypropylene and 5 to 50 Joule per cm 2 in the case of polyethylene terephthalate whereby said film becomes slippery.
Claim 2
Independent Claim
65 words
A method of imparting a slippery surface to a film of polypropylene or polyethylene terephthalate which comprises both stretching said film and subjecting said film to ultraviolet light of an irradiation energy of about 1 to 10 Joule per cm 2 in the case of polypropylene and 5 to 50 Joule per cm 2 in the case of polyethylene terephthalate whereby said film becomes slippery.
Claim 3
Dependent Claim
11 words
A method of claim 1, wherein said film is polyethylene terephthalate.
Claim 4
Dependent Claim
10 words
A method of claim 1, wherein said film is polypropylene.
Claim 5
Dependent Claim
15 words
A method of claim 1, wherein the stretching and ultraviolet treatments are carried on simultaneously.
Claim 6
Dependent Claim
13 words
A method of claim 1, wherein the ultraviolet light treatment precedes the stretching.
Claim 7
Independent Claim
72 words
A method of providing a film of polyethylene terephthalate or polypropylene with a delustered, moist and oil-impregnable surface which comprises both stretching said film and subjecting said film to ultraviolet light irradiation, of an irradiation energy of about 5 to 50 Joule per cm 2 in the case of polypropylene and 50 to 500 Joule per cm 2 in the case of polyethylene terephthalate, whereby said film becomes delustered, moist and oil-impregnable.
Claim 8
Independent Claim
72 words
A method of providing a film of polyethylene terephthalate or polypropylene with a delustered, moist and oil-impregnable surface which comprises both stretching said film and subjecting said film to ultraviolet light irradiation, of an irradiation energy of about 5 to 50 Joule per cm 2 in the case of polypropylene and 50 to 500 Joule per cm 2 in the case of polyethylene terephthalate, whereby said film becomes delustered, moist and oil-impregnable.
Claim 9
Dependent Claim
11 words
A method of claim 6, wherein said film is polyethylene terephthalate.
Claim 10
Dependent Claim
10 words
A method of claim 6, wherein said film is polypropylene.
Claim 11
Dependent Claim
13 words
A method of claim 6, wherein the stretching follows the ultraviolet light irradiation.
Claim 12
Dependent Claim
14 words
A method of claim 6, wherein the stretching and ultraviolet light irradiation occur simultaneously.
Claim 13
Independent Claim
67 words
A method of enhancing the drawability of a film of polyethylene terephthalate or polypropylene which comprises both stretching said film and subjecting said film to ultraviolet light of an irradiation energy of about 10 to 100 Joule per cm 2 in the case of polypropylene and 500 to 5000 Joule per cm 2 in the case of polyethylene terephthalate, whereby the drawability of said film is enhanced.
Claim 14
Independent Claim
67 words
A method of enhancing the drawability of a film of polyethylene terephthalate or polypropylene which comprises both stretching said film and subjecting said film to ultraviolet light of an irradiation energy of about 10 to 100 Joule per cm 2 in the case of polypropylene and 500 to 5000 Joule per cm 2 in the case of polyethylene terephthalate, whereby the drawability of said film is enhanced.
Claim 15
Dependent Claim
10 words
A method of claim 11, wherein the film is polypropylene.
Claim 16
Dependent Claim
11 words
A method of claim 11, wherein said film is polyethylene terephthalate.
Claim 17
Dependent Claim
15 words
A method of claim 12 or 13, wherein the stretching follows the ultraviolet light treatment.
Claim 18
Dependent Claim
16 words
A method of claim 12 or 13, wherein the stretching and ultraviolet light treatment occur simultaneously.
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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) | 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 |