Patent DE489555C successfully refreshed from Google Patents.
US3645822A
Expired / Lapsed
US
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Method for providing multilayer films having improved slip properties
Assignee: Dow Chemical Co
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Filing: 1969-01-31
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Granted: 1972-02-29
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Expires: 1989-01-31
Abstract
Abstract Slip properties of multilayer films of thermoplastic organic polymers are improved by incorporating small amounts of a conventional slip additive, e.g., oleamide, into one or more of the inner layers of said films. Said films exhibit slip characteristics which are retained for relatively long periods of time.
Inventors
- 👤 Almar T Widiger
- 👤 Drew H Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/30; B32B27/304; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B32B2250/00; B32B2250/02; B32B2307/00; B32B2307/70; B32B2307/718; B32B2307/746; Y; Y10; Y10S; Y10S206/00; Y10S206/819; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
The method according to claim 1 wherein the slip additive is a non-ionic surfactant.
Claim 2
Dependent Claim
24 words
The method improvement according to claim 1 wherein the slip additive is an amide of a carboxylic acid having at least five carbon atoms.
Claim 3
Dependent Claim
12 words
The method improvement according to claim 3 wherein the amide is oleamide.
Claim 4
Dependent Claim
11 words
The method according to claim 3 wherein the amide is erucylamide.
Claim 5
Dependent Claim
20 words
The method according to claim 1 wherein the slip additive is a carboxylic acid having at least four carbon atoms.
Claim 6
Dependent Claim
13 words
The method according to claim 6 wherein the carboxylic acid is 12-hydroxystearic acid.
Claim 7
Dependent Claim
48 words
The method according to claim 1 wherein the inner layer has incorporated therein from about 2,000 to about 4,000 p.p.m. of the slip additive and the exterior layer contains from about 500 to about 4,000 p.p.m. of the slip additive based on the weight of the exterior layer.
Claim 8
Dependent Claim
54 words
The method according to claim 1 wherein the multilayer film comprises (1) a center barrier layer of a vinylidene chloride copolymer, (2) an adhesive layer of an ethylene/vinyl acetate copolymer laminated to each side of the barrier layer and (3) an exterior layer of an olefin polymer laminated to each of the adhesive layers.
Claim 9
Dependent Claim
80 words
The method according to claim 9 wherein each of the two adhesive layers has dispersed therein from about 500 to about 7, 000 p.p.m. based on the weight of the adhesive layers of an amide of a carboxylic acid having at least five carbon atoms and each of the exterior layers contains from about 500 to about 4,000 p.p.m. based on the weight of the exterior layer of an amide of a carboxylic acid having at least five carbon atoms.
Claim 10
Dependent Claim
37 words
A method according to claim 1 wherein steps (3) and (4) are carried out by feeding said first and second polymers separately into a coextrusion means and coextruding said polymers in the form of said multilayer film.
References Cited (Backward Citations)
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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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |