US3891008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer thermoplastic film and method of making same
Assignee: WR Grace and Co
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Filing: 1973-12-26
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Granted: 1975-06-24
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Expires: 1993-12-26
Abstract
Abstract An improved polymeric composition comprising a blend of polybutene-1 with an ethylene-propylene copolymer which, when combined with a shrinkable, cross-linked polymer of ethylene, produces a laminate having improved abuse and tear resistance and reduced self-adherence.
Inventors
- 👤 Entremont Donald J D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:09
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0016; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C66/00; B29C66/70; B29C66/71; B29C66/712; B32B1/00; B32B1/08; B32B7/00; B32B7/04; B32B7/12; B29C48/10; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0633; B29K2023/08; B29K2023/083; B29K2023/10; B29K2023/12; B29K2031/00; B29K2031/04; B29K2105/00; B29K2105/0085; B29K2105/0088; B29L; B29L2031/00; B29L2031/712; B29L2031/7128; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/30; B32B2307/31; B32B2419/00; B32B2419/06; B32B2439/00; B32B2439/70; B32B2597/00; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/18; C08L23/20; C08L2312/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
A MULTI-LAYER THERMOPLASTIC FILM COMPRISING: A. A SUBSTRATE LAYER COMPRISING AN ORIENTED, CROSS-LINKED POLYMER OF ETHYLENE; AND, B. A COATING LAYER COMPRISING A BLENDED MIXTURE HAVING A (I) MAJOR PORTION OF AN ETHYLENE-PROPYLENE COPOLYMER WHEREIN THE ETHYLENE CONSTITUENT OF SAID COPOLYMER IS IN THE RANGE OF 0.1 TO 10 PERCENT BY WEIGHT WITH A (2) MINOR PORTION OF POLYBUTENE-1,
Claim 2
Dependent Claim
59 words
A MULTI-LAYER THERMOPLASTIC FILM COMPRISING: A. A SUBSTRATE LAYER COMPRISING AN ORIENTED, CROSS-LINKED POLYMER OF ETHYLENE; AND, B. A COATING LAYER COMPRISING A BLENDED MIXTURE HAVING A (I) MAJOR PORTION OF AN ETHYLENE-PROPYLENE COPOLYMER WHEREIN THE ETHYLENE CONSTITUENT OF SAID COPOLYMER IS IN THE RANGE OF 0.1 TO 10 PERCENT BY WEIGHT WITH A (2) MINOR PORTION OF POLYBUTENE-1,
Claim 3
Dependent Claim
30 words
ThE multi-layer film of claim 1 wherein said coating layer comprises 60 to 95 percent by weight of an ethylene-propylene copolymer and 40 to 5 percent by weight of polybutene-1.
Claim 4
Dependent Claim
35 words
The multi-layer film of claim 2 wherein said coating layer comprises ethylene-propylene copolymer in the range of 70 to 80 percent by weight and polybutene-1 in the range of 30 to 20 percent by weight.
Claim 5
Dependent Claim
13 words
The film of claim 1 wherein both the substrate and coating are oriented.
Claim 6
Dependent Claim
24 words
The multi-layer film of claim 1 wherein the ethylene constituent of said copolymer is in the range from 2.5 to 4.0 percent by weight.
Claim 7
Dependent Claim
27 words
The multi-layer film of claim 1 wherein said cross-linked polymer of ethylene is a cross-linked copolymer of ethylene vinyl acetate with 2 to 4 percent vinyl acetate.
Claim 8
Dependent Claim
25 words
THE MULTI-LAYER FILM OF CLAIM 1 WHEREIN SAID SUBSTRATE LAYER IS A SEAMLES TUBE AND SAID COATING LAYER IS ON THE OUTSIDE OF SAID TUBE.
Claim 9
Dependent Claim
17 words
The multi-layer film of claim 1 including an adhesive layer between said substrate and said coating layers.
Claim 10
Independent Claim
81 words
A method of improving the tear and abuse resistance of and reducing the tackiness of multi-layer, oriented thermoplastic film comprising the steps of: a. providing a tubular substrate comprising a cross-linked polymer of ethylene; b. inflating said tubular substrate; and, c. coating said tubular substrate by coextruding thereon a blended mixture comprising a major portion of an ethylene-propylene copolymer and a minor portion of polybutene-1, the ethylene constituent of said copolymer being in the range of 0.1 to 10 percent weight.
Claim 11
Independent Claim
81 words
A method of improving the tear and abuse resistance of and reducing the tackiness of multi-layer, oriented thermoplastic film comprising the steps of: a. providing a tubular substrate comprising a cross-linked polymer of ethylene; b. inflating said tubular substrate; and, c. coating said tubular substrate by coextruding thereon a blended mixture comprising a major portion of an ethylene-propylene copolymer and a minor portion of polybutene-1, the ethylene constituent of said copolymer being in the range of 0.1 to 10 percent weight.
Claim 12
Dependent Claim
31 words
The method of claim 9 wherein said ethylene-propylene copolymer comprises 60 to 95 percent by weight of said coating mixture and said polybutene-1 comprises 40 to 5 percent of said mixture.
Claim 13
Dependent Claim
34 words
The method of claim 9 wherein said blended mixture comprises ethylene-propylene copolymer in the range of 70 to 80 percent by weight and polybutene-1 in the range of 30 to 20 percent by weight.
References Cited (Backward Citations)
US3754063A
Cited
US3733373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |