Patent US3920875A successfully refreshed from Google Patents.
US3920875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated polymeric paper films and a method of producing the same
Assignee: Individual
•
Filing: 1972-05-30
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Granted: 1975-11-18
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Expires: 1992-05-30
Abstract
Abstract This invention relates to coated paper-like plastic films having a microporous surface layer and a method of producing the same. Such a coated plastic film is produced by coating plastic polymeric films with a coating composition comprising a resin, a plasticizer, an inorganic fine powder and dimethylformamide and then the coated plastic film is treated with water and subjected to drying. Also, in accordance with this invention, the coated plastic film is subjected to a heat-treatment before or after the coated plastic film is treated with water or after the coated plastic polymeric film is dried.
Inventors
- 👤 Tosho Suzuki
- 👤 Koichi Awano
- 👤 Ogino Katsuhisa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; B; B41; B41M; B41M5/00; B41M5/50; B41M5/502; B41M5/508; B41M5/52; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/096; C08J7/00; C08J7/02; C08J7/04; C08J7/0427; C08J7/043; C08J7/044; C08J7/048; B41M5/5218; B41M5/5227; C08J2201/00; C08J2201/04; C08J2201/054; C08J2201/0542; C08J2201/0544
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
187 words
A PROCESS FOR PRODUCING A COATED PLASTIC FILM FOR SYNTHETIC PAPER, HAVING A MICROPOROUS SURFACE LAYER FOR USE IN THE GRAPHIC ART WHICH COMPRISES THE STEPS OF: A. COATING AT LEAST ONE SURFACE OF A POLYMERIC PLASTIC FILM SUBSTANCE, THE SURFACE OF WHICH IS SOLUBLE OR SWELLABLE IN DIMETHYLFORMAMIDE, WITH A COATING COMPOSITION COMPRISING (1) A RESIN PREPARED BY USING AT LEAST ONE OF THE MAIN MONOMERS FROM WHICH THE POLYMERIC PLASTIC FILM SUBSTRATE IS MADE; (2) A PLASTICIZER FOR SAID RESIN; (3) AN INORGANIC POWDER, AND (4) DIMETHYLFORMAMIDE AS THE SOLVENT TO FORM A SWOLLEN COATING LAYER ON THE SAID PLASTIC FILM; B. PARTIALLY DISSOLVING AND SWELLING THE PLASTIC FILM SUBSTRATE BY THE ACTION OF THE DIMETHYLFORMAMIDE COMPONENT OF THE COATING COMPOSITION THEREON; C. SUBSEQUENTLY CONVERTING SAID SWOLLEN SURFACE LAYER INTO A MICROPOROUS SURFACE LAYER BY CONTACTING SAID COATED SUBSTRATE WITH HOT WATER IN THE ORDER OF 70* - 100*C WHEREBY THE DIMETHYLFORMAMIDE IS LEACHED FROM THE SWOLLEN COATING AND SUBSTRATE TO PROVIDE A MICROPOROUS SURFACE COATING ON SAID SUBSTRATE; D. HEAT TREATING SAID MICROPOROUS COATED LAYER TO STRENGTHEN SAME; E. DRYING SAID COATED PLASTIC FILM.
Claim 2
Dependent Claim
187 words
A PROCESS FOR PRODUCING A COATED PLASTIC FILM FOR SYNTHETIC PAPER, HAVING A MICROPOROUS SURFACE LAYER FOR USE IN THE GRAPHIC ART WHICH COMPRISES THE STEPS OF: A. COATING AT LEAST ONE SURFACE OF A POLYMERIC PLASTIC FILM SUBSTANCE, THE SURFACE OF WHICH IS SOLUBLE OR SWELLABLE IN DIMETHYLFORMAMIDE, WITH A COATING COMPOSITION COMPRISING (1) A RESIN PREPARED BY USING AT LEAST ONE OF THE MAIN MONOMERS FROM WHICH THE POLYMERIC PLASTIC FILM SUBSTRATE IS MADE; (2) A PLASTICIZER FOR SAID RESIN; (3) AN INORGANIC POWDER, AND (4) DIMETHYLFORMAMIDE AS THE SOLVENT TO FORM A SWOLLEN COATING LAYER ON THE SAID PLASTIC FILM; B. PARTIALLY DISSOLVING AND SWELLING THE PLASTIC FILM SUBSTRATE BY THE ACTION OF THE DIMETHYLFORMAMIDE COMPONENT OF THE COATING COMPOSITION THEREON; C. SUBSEQUENTLY CONVERTING SAID SWOLLEN SURFACE LAYER INTO A MICROPOROUS SURFACE LAYER BY CONTACTING SAID COATED SUBSTRATE WITH HOT WATER IN THE ORDER OF 70* - 100*C WHEREBY THE DIMETHYLFORMAMIDE IS LEACHED FROM THE SWOLLEN COATING AND SUBSTRATE TO PROVIDE A MICROPOROUS SURFACE COATING ON SAID SUBSTRATE; D. HEAT TREATING SAID MICROPOROUS COATED LAYER TO STRENGTHEN SAME; E. DRYING SAID COATED PLASTIC FILM.
Claim 3
Dependent Claim
35 words
A process according to claim 1 wherein the heat treatment is conducted by a heating means selected from the group consisting of, steam, infrared radiant sources, hot air sources, heated rolls, or induction heating sources.
Claim 4
Dependent Claim
22 words
The process according to claim 1, wherein said coating composition includes a colorant, a lubricant, an antistatic agent, or a mixture thereof.
Claim 5
Dependent Claim
25 words
A process according to claim 1, wherein said plastic film is a film made of a vinyl polymer, vinyl copolymer, polycarbonate, 8-nylon or cellulosic plastics.
Claim 6
Dependent Claim
30 words
A process according to claim 1 wherein said resin contained in the coating composition is a vinyl polymer, vinyl copolymer, polycarbonate, 8-nylon, cellulosic plastics or a mixture of these polymers.
Claim 7
Dependent Claim
28 words
A process according to claim 1 wherein said plasticizer is a compound soluble in dimethylformamide, insoluble in water and compatible with the resin contained in the coating composition.
Claim 8
Dependent Claim
12 words
A process according to claim 1 wherein said plastic film comprises polystyrene.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein said plastic film comprises polyvinyl chloride.
Claim 10
Dependent Claim
39 words
A process according to claim 1, wherein said coating composition comprises 100 parts of the resin, 1 to 100 parts of the plasticizer, 20 to 1,000 parts of the inorganic fine powder, and 20 to 2,000 parts of dimethylformamide.
Claim 11
Dependent Claim
56 words
A process according to claim 1, wherein said coating composition comprises 100 parts of the resin, 1 to 100 parts of the plasticizer, 10 to 500 parts of the inorganic fine powder, and 20 to 200 parts of dimethylformamide, and the moisture content of the said inorganic fine powder is restricted to less than 10 parts.
Claim 12
Dependent Claim
40 words
A process according to claim 1, wherein said coating composition comprises 100 parts of the resin, 1 to 100 parts of the plasticizer, 10 to 1,000 parts of the inorganic fine powder, and 200 to 1,000 parts of the cimethylformamide.
Claim 13
Dependent Claim
39 words
A process according to claim 1, wherein said coating composition comprises 100 parts of the resin, 5 to 50 parts of the plasticizer, 30 to 500 parts of the inorganic fine powder, and 100 to 1,000 parts of dimethylformamide.
Claim 14
Dependent Claim
19 words
A process according to claim 1, wherein the heat treatment is conducted at any stage after the water treatment.
Claim 15
Dependent Claim
17 words
A process accordiNg to claim 1, wherein said heat treatment is conducted immediately after the coating step.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |