US3850790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent composite film of methyl methacrylate-butadiene-styrene and polyvinylidene chloride
Assignee: Denervaud Technoplastic SA
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Filing: 1972-09-07
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Granted: 1974-11-26
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Expires: 1992-09-07
Abstract
Abstract A composite plastic film is produced by extruding a first support film of methyl methacrylate-butadiene-styrene terpolymer, blow extruding a second film of polyvinylidene chloride, contacting said first and second films in laminating relationship to form a composite and applying sufficient heat and pressure to said composite to effect mutual bonding between said first and second films.
Inventors
- 👤 M Denervaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:26
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C43/00; B29C43/22; B29C43/30; B29C43/305; B29C51/00; B29C51/14; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/269; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A PROCESS FOR PRODUCING A COMPOSITE PLASTIC FILM WHICH CONSISTS ESSENTIALLY OF: EXTRUDING A FIRST SUPPORT FILM OF METHYL METHACRYLATEBUTADIENE-STYRENE TERPOLYMER IN A THICKNESS OF 0.1 TO 1.1 MM., BLOW EXTRUDING A SECOND FILM OF POLYVINYLIDENE CHLORIDE IN A THICKNESS OF 0.01 TO 0.05 MM., CONTACTING SAID FIRST AND SECOND FILMS IN LAMINATING RELATIONSHIP TO FORM A COMPOSITE AND APPLYING SUFFICIENT HEAT AND PRESSURE TO SAID COMPOSITE TO EFFECT MUTUAL BONDING BETWEEN SAID FIRST AND SECOND FILMS.
Claim 2
Dependent Claim
77 words
A PROCESS FOR PRODUCING A COMPOSITE PLASTIC FILM WHICH CONSISTS ESSENTIALLY OF: EXTRUDING A FIRST SUPPORT FILM OF METHYL METHACRYLATEBUTADIENE-STYRENE TERPOLYMER IN A THICKNESS OF 0.1 TO 1.1 MM., BLOW EXTRUDING A SECOND FILM OF POLYVINYLIDENE CHLORIDE IN A THICKNESS OF 0.01 TO 0.05 MM., CONTACTING SAID FIRST AND SECOND FILMS IN LAMINATING RELATIONSHIP TO FORM A COMPOSITE AND APPLYING SUFFICIENT HEAT AND PRESSURE TO SAID COMPOSITE TO EFFECT MUTUAL BONDING BETWEEN SAID FIRST AND SECOND FILMS.
Claim 3
Dependent Claim
34 words
The process of claim 1, wherein said first film is formed by extrusion through a fishtail die, and wherein said heat and pressure are applied to said composite by means of a multi-roller calender.
Claim 4
Dependent Claim
53 words
A composite plastic film which consists of a first ply of a methyl methacrylate-butadiene-styrene terpolymer extruded film in a thickness ranging from 0.1 to 1.1 mm and a second ply of blow extruded polyvinylidene chloride film in a thickness ranging from 0.01 to 0.05 mm, said plys being bonded by heat and pressure.
Claim 5
Dependent Claim
53 words
A composite plastic film which consists of a first ply of a methyl methacrylate-butadiene-styrene terpolymer extruded film in a thickness ranging from 0.1 to 1.1 mm and a second ply of blow extruded polyvinylidene chloride film in a thickness ranging from 0.01 to 0.05 mm, said plys being bonded by heat and pressure.
Claim 6
Dependent Claim
20 words
The composite plastic film of claim 3, wherein the total thickness of said film is from 0.11 to 0.75 mm.
References Cited (Backward Citations)
US2987102A
Cited
US3218224A
Cited
US3322614A
Cited
US3356560A
Cited
US3595735A
Cited
US3726743A
Cited
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 |