US4247663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shrinkable polyvinyl chloride film with methyl methacrylate polymer additive
Assignee: Mitsubishi Chemical Corp
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Filing: 1979-02-14
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Granted: 1981-01-27
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Expires: 1999-02-14
Abstract
Abstract A heat shrinkable polyvinyl chloride film which shrinks more than 60% in one direction or more than 75% as an area shrinkage is prepared by stretching a film comprising 5 to 25 wt. parts of a methyl methacrylate type copolymer and 100 wt. parts of polyvinyl chloride at a special high stretch ratio.
Inventors
- 👤 Norio Yoshiga
- 👤 Hiroshi Nakamura
- 👤 Mototaka Ohmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:21
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12; Y; Y10; Y10S; Y10S264/00; Y10S264/71; Y10S428/00; Y10S428/91
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
A highly heat shrinkable polyvinyl chloride film which shrinks more than 60% in one direction prepared by uniaxially stretching a film comprising 5 to 25 wt. parts of a methyl methacrylate copolymer comprising 60 to 85 weight percent of methyl methacrylate component and 100 parts of polyvinyl chloride, wherein said film has been stretched at a stretch ratio of 3.5 to 6 times in one direction and at a stretch ratio of less than 1.5 times in the perpendicular direction.
Claim 2
Dependent Claim
80 words
A highly heat shrinkable polyvinyl chloride film which shrinks more than 60% in one direction prepared by uniaxially stretching a film comprising 5 to 25 wt. parts of a methyl methacrylate copolymer comprising 60 to 85 weight percent of methyl methacrylate component and 100 parts of polyvinyl chloride, wherein said film has been stretched at a stretch ratio of 3.5 to 6 times in one direction and at a stretch ratio of less than 1.5 times in the perpendicular direction.
Claim 3
Dependent Claim
45 words
A highly heat shrinkable polyvinyl chloride film according to claim 1 wherein the methyl methacrylate type copolymer is a copolymer comprising 60 to 85 wt. % of methyl methacrylate component and 40 to 15 wt. % of a C 1 -C 4 alkyl acrylate component.
Claim 4
Dependent Claim
40 words
A highly heat shrinkable polyvinyl chloride film according to claim 1 wherein the methyl methacrylate type copolymer is a copolymer comprising 60 to 85 wt. % of methyl methacrylate component and 40 to 15 wt. % of butyl acrylate component.
Claim 5
Dependent Claim
25 words
A highly heat shrinkable polyvinyl chloride film according to claim 1 wherein has been stretched in a stretching zone at 60° C. to 100° C.
Claim 6
Dependent Claim
87 words
A highly heat shrinkable polyvinyl chloride film which film shrinks more than 75% as an area shrinkage prepared by biaxially stretching a film comprising 5 to 25 wt. parts of a methyl methacrylate copolymer comprising 60 to 85 weight percent of methyl methacrylate component and 100 parts of polyvinyl chloride, wherein said film has been stretched at a total of stretch ratios in logitudinal direction in and transverse direction of 5 to 7.5 times and at a stretch ratio of more than 1.5 times in each direction.
Claim 7
Dependent Claim
87 words
A highly heat shrinkable polyvinyl chloride film which film shrinks more than 75% as an area shrinkage prepared by biaxially stretching a film comprising 5 to 25 wt. parts of a methyl methacrylate copolymer comprising 60 to 85 weight percent of methyl methacrylate component and 100 parts of polyvinyl chloride, wherein said film has been stretched at a total of stretch ratios in logitudinal direction in and transverse direction of 5 to 7.5 times and at a stretch ratio of more than 1.5 times in each direction.
Claim 8
Dependent Claim
31 words
A film according to claim 5, which gives an area shrinkage of more than 80% attained by stretching the film at a total of stretch ratios of more than about 6.0.
Claim 9
Dependent Claim
45 words
A highly heat shrinkable polyvinyl chloride film according to claim 5, wherein the methyl methacrylate type copolymer is a copolymer comprising 60 to 85 wt. % of methyl methacrylate component and 40 to 15 wt. % of a C 1 -C 4 alkyl acrylate component.
Claim 10
Dependent Claim
40 words
A highly heat shrinkable polyvinyl chloride film according to claim 5, wherein the methyl methacrylate type copolymer is a copolymer comprising 60 to 85 wt. % of methyl methacrylate component and 40 to 15 wt. % of butyl acrylate component.
Claim 11
Dependent Claim
24 words
A highly heat shrinkable polyvinyl chloride film according to claim 5 which has been stretched in a stretching zone at 60° to 100° C.
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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 |