US3660141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of films having excellent adhesiveness to gelatins
Assignee: Mitsubishi Chemical Corp
•
Filing: 1969-12-03
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Granted: 1972-05-02
•
Expires: 1989-12-03
Abstract
Abstract A filler-blended polyolefin film is treated with a solution of acrylic ester polymer in a positive solvent which can at least swell the polyolefin, and the film in contact with the solvent in the solution is heated to the temperature of at least 50* C. After removal of the solvent, a film to which gelatins are adhesive is obtained, which film comprises the polyolefin film substrate and a layer of acrylic ester polymer adhering to the substrate.
Inventors
- 👤 Mitsuo Yoshiyasu
- 👤 Sadao Saito
- 👤 Yoshio Miyabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:20
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A method for producing a film having a gelatin coating thereon as claimed in claim 1 in which said polyolefin is at least one polymer selected from the group consisting of crystalline polypropylenes and polyethylenes.
Claim 2
Dependent Claim
27 words
A method for producing a film having a gelatin coating thereon as claimed in claim 1 in which said substrate film has been drawn at least uniaxially.
Claim 3
Dependent Claim
48 words
A method for producing a film having a gelatin coating thereon as claimed in claim 1 in which said substrate film is a laminated film comprising a backing film of polyolefin laminated on at least one surface thereof with a coat film composed of a fine filler-blended polyolefin.
Claim 4
Dependent Claim
30 words
A method for producing a film having a gelatin coating thereon as claimed in claim 1 in which said acrylic ester polymer is selected from polymers of lower alkyl acrylates.
Claim 5
Dependent Claim
25 words
A method for producing a film having a gelatin coating thereon as claimed in claim 1 in which said positive solvent is an aromatic hydrocarbon.
Claim 6
Dependent Claim
58 words
A method for producing a film having a gelatin coating thereon as claimed in claim 1 in which said heating is carried out by exposing the surface to the solution at a temperature lower than 50* C and then heating the surface while maintaining the contact condition with the solution to a temperature of at least 50* C.
Claim 7
Dependent Claim
33 words
A method for producing a film having a gelatin coating thereon as claimed in claim 1 in which said step of removing the solvent is carried out simultaneously with said step of heating.
References Cited (Backward Citations)
US2466038A
Cited
US2512459A
Cited
US3227605A
Cited
US3262808A
Cited
US3405083A
Cited
US3519589A
Cited
US3519531A
Cited
US3483023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |