US3850667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic paper and process
Assignee: Nippon Kakoh Seishi KK
•
Filing: 1972-06-29
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Granted: 1974-11-26
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Expires: 1992-06-29
Abstract
Abstract Process for the production of novel synthetic paper from thermoplastic polymer films in which the surface of the films are opacified by treatment with a liquid which swells and dissolves the polymer and thereafter treating with another liquid which coagulates the polymer. Intermediate treatments are employed to improve the products.
Inventors
- 👤 K Tani
- 👤 S Imoto
- 👤 S Kawazoe
- 👤 H Noguchi
- 👤 B Yamada
- 👤 W Ichihara
- 👤 T Nagai
- 👤 F Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:15
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
167 words
A PROCESS FOR PRODUCING A DIMENSIONALLY STABLE SYNYHETIC PAPER WHICH IS A THERMOPLASTIC POLYMER FILM COMPRISING A FIRST LAYER SUBSTANTIALLY FREE OF MICROPORES HAVING AT LEAST ONE INK-RECEPTIVE, OPAQUE, MICROPOROUS SURFACE LAYER INTEGRAL THEREWITH; SAID PAPER BEING CHARACTERIZED BY AN OPACITY OF AT LEAST 50%, THE BONDING STRENGTH BINDING SSID FIRST LAYER AND SAID SURFACE LAYER BEING OF SUFFICIENT STRENGTH SO THAT THE PRODUCT IS SUBSTANTIALLY FREE FROM PICKING WHEN PRINTWS WITH NUMBER TWELVE TACK INKS; AND BY A CAPACITY TO BE CLARIFIED WITHOUT DISTORTION BY THE APPLICATION OF ELEVATED PRESSURE AT TEMPERATURES UP TO 35*C. ABOVE THE SOFTENING POINT OF THE FILM DURING A PERIOD OF ABOUT ONE TO THREE SECONDS; WHICH PROCESS COMPRISES INITIALLY TREATING AT LEAST ONE SURFACE OF A THERMOPLASTIC POLYMER FILM WITH A LIQUID WHICH DISSOLVES AND SWELLS THE POLYMER UNDER CONDITIONS SUCH THAT FROM ABOUT 0.001% TO 0.3% BY WEIGHT, BASED ON THE TOTAL WEIGHT, OF THE POLYMER DISSOLVES, TREATING SAID FILM WITH A COAGULATING AGENT AND THEREAFTER DRYING SAID FILM.
Claim 2
Dependent Claim
167 words
A PROCESS FOR PRODUCING A DIMENSIONALLY STABLE SYNYHETIC PAPER WHICH IS A THERMOPLASTIC POLYMER FILM COMPRISING A FIRST LAYER SUBSTANTIALLY FREE OF MICROPORES HAVING AT LEAST ONE INK-RECEPTIVE, OPAQUE, MICROPOROUS SURFACE LAYER INTEGRAL THEREWITH; SAID PAPER BEING CHARACTERIZED BY AN OPACITY OF AT LEAST 50%, THE BONDING STRENGTH BINDING SSID FIRST LAYER AND SAID SURFACE LAYER BEING OF SUFFICIENT STRENGTH SO THAT THE PRODUCT IS SUBSTANTIALLY FREE FROM PICKING WHEN PRINTWS WITH NUMBER TWELVE TACK INKS; AND BY A CAPACITY TO BE CLARIFIED WITHOUT DISTORTION BY THE APPLICATION OF ELEVATED PRESSURE AT TEMPERATURES UP TO 35*C. ABOVE THE SOFTENING POINT OF THE FILM DURING A PERIOD OF ABOUT ONE TO THREE SECONDS; WHICH PROCESS COMPRISES INITIALLY TREATING AT LEAST ONE SURFACE OF A THERMOPLASTIC POLYMER FILM WITH A LIQUID WHICH DISSOLVES AND SWELLS THE POLYMER UNDER CONDITIONS SUCH THAT FROM ABOUT 0.001% TO 0.3% BY WEIGHT, BASED ON THE TOTAL WEIGHT, OF THE POLYMER DISSOLVES, TREATING SAID FILM WITH A COAGULATING AGENT AND THEREAFTER DRYING SAID FILM.
Claim 3
Dependent Claim
46 words
A process as in claim 1 wherein the initial treatment is from about 1 to 10 seconds at a temperature from about 20*C to 70*C, and coagulation is effected at a temperature from about 20*C to 30*C during a period from about 10 to 60 seconds.
Claim 4
Dependent Claim
39 words
A process as in claim 1 wherein, before coagulating, the product is drieD at from about 15*C to 50*C to remove from about 30% to 80% by weight of the liquid remaining on the film after the initial treatment.
Claim 5
Dependent Claim
33 words
A process as in claim 1 wherein, before coagulating, the film is pressed to remove from about 25% to 75% by weight of the liquid remaining on the film after the initial treatment.
Claim 6
Dependent Claim
12 words
A process as in claim 1 wherein the polymer is a polyolefin.
Claim 7
Dependent Claim
11 words
A process as in claim 5 wherein the polymer is polyethylene.
Claim 8
Dependent Claim
15 words
A process as in claim 1 wherein the thermoplastic polymer film is a polyvinyl polymer.
Claim 9
Dependent Claim
13 words
A process as in claim 7 wherein the polymer is a polyvinyl chloride.
Claim 10
Dependent Claim
11 words
A process as in claim 7 wherein the polymer is polystyrene.
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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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |