Patent US4254074A successfully refreshed from Google Patents.
US4254074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous production of decorated synthetic resin sheet
Assignee: Mitsubishi Chemical Corp
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Filing: 1979-03-21
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Granted: 1981-03-03
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Expires: 1999-03-21
Abstract
Abstract Synthetic resin sheet material having a film, possibly bearing printing on at least one of its surfaces, with the film forming an integral part of the material is made by feeding the film together with a polymerizable syrup into a continuous plastic casting machine, the film being compatible with the syrup so that during passage through the machine with the syrup, the film softens and at least slightly dissolves in the syrup during polymerizing of the syrup and consequent solidifying of all of the components together.
Inventors
- 👤 Yasuo Toyooka
- 👤 Kunio Ohnishi
- 👤 Haruo Murase
- 👤 Tadaomi Ueno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:02
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/08; B32B38/10; C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J2333/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A method for continuously producing synthetic resin sheet material having a synthetic resin film integrally blended with the sheet material, said method comprising feeding a polymerizable synthetic resin syrup to the entrance of the casting space formed by the continuously traveling endless belts of a continuous casting machine, said belts having mutually parallel interspaced belt spans forming said space, and continuously feeding to the surface of at least one of said belts a preformed synthetic resin film that is carried by the belt into said entrance into contact with said syrup and travels through the space with the syrup, said film being compatible with said syrup so as to soften and at least partially dissolve in and blend with said syrup, said belts being heated so as to polymerize said syrup and produce said sheet material as a continuously traveling strip leaving said machine.
Claim 2
Independent Claim
144 words
A method for continuously producing synthetic resin sheet material having a synthetic resin film integrally blended with the sheet material, said method comprising feeding a polymerizable synthetic resin syrup to the entrance of the casting space formed by the continuously traveling endless belts of a continuous casting machine, said belts having mutually parallel interspaced belt spans forming said space, and continuously feeding to the surface of at least one of said belts a preformed synthetic resin film that is carried by the belt into said entrance into contact with said syrup and travels through the space with the syrup, said film being compatible with said syrup so as to soften and at least partially dissolve in and blend with said syrup, said belts being heated so as to polymerize said syrup and produce said sheet material as a continuously traveling strip leaving said machine.
Claim 3
Dependent Claim
12 words
The method of claim 1 in which said syrup is acrylic resin.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which said film is acrylic resin.
Claim 5
Dependent Claim
24 words
The method of claim 1 in which said syrup is a methyl methacrylate monomer-polymer syrup and said film is a methyl methacrylate polymer film.
Claim 6
Dependent Claim
12 words
The method of claim 1 in which said film is polyvinyl chloride.
Claim 7
Dependent Claim
11 words
The method of claim 1 in which said film is polycarbonate.
Claim 8
Dependent Claim
20 words
The method of claim 1 in which said film is colored or printed on its surface contacted by said syrup.
Claim 9
Dependent Claim
38 words
The method of claim 1 in which the surface of the belt is thinly coated with the syrup being cast prior to feeding the film to the belt and then the film is layed on the thin coating.
References Cited (Backward Citations)
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US3488246A
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US3872197A
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US4041120A
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US4133861A
Cited
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |