US4044187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film laminates having a reirradiated layer
Assignee: WR Grace and Co Conn
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Filing: 1975-05-22
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Granted: 1977-08-23
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Expires: 1995-05-22
Abstract
Abstract The seal strength, dimensional stability, bond strength between plies, and ink adhesion of certain film laminates may be significantly increased by irradiating the substrate, forming the laminate, and then irradiating the entire laminate whereas in the prior art the practice is to only irradiate the substrate layer prior to forming the laminate.
Inventors
- 👤 William P. Kremkau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:16
CPC Classifications
B; B29; B29C; B29C71/00; B29C71/04; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2323/00; B32B2323/04; B32B2327/00; B32B2327/06; B32B2329/00; B32B2329/04; B32B2331/00; B32B2331/04; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
53 words
A method of improving the properties of polymeric film laminates comprising the steps of: a. forming a laminate by preparing a layer that is cross-linked and applying at least one additional polymeric layer thereto, at least one of said additional layers being uncross-linked but being cross-linkable by irradiation; and, b. irradiating said laminate.
Claim 2
Independent Claim
53 words
A method of improving the properties of polymeric film laminates comprising the steps of: a. forming a laminate by preparing a layer that is cross-linked and applying at least one additional polymeric layer thereto, at least one of said additional layers being uncross-linked but being cross-linkable by irradiation; and, b. irradiating said laminate.
Claim 3
Independent Claim
101 words
A method of improving the properties of film laminates comprising the steps of: a. providing a cross-linkable substrate; b. irradiating said substrate to a dosage in the range between 2 and 20 MR to cross-link same; c. applying a layer of a relatively gas impermeable material to said substrate; d. applying a layer of cross-linkable material to said impermeable layer thereby forming a laminate having layers of cross-linked substrate, unirradiated impermeable material, and cross-linkable material; e. stretching said laminate thereby thinning same to a predetermined film thickness; and, f. irradiating said laminate to a dosage level of at least 2.5 MR.
Claim 4
Independent Claim
101 words
A method of improving the properties of film laminates comprising the steps of: a. providing a cross-linkable substrate; b. irradiating said substrate to a dosage in the range between 2 and 20 MR to cross-link same; c. applying a layer of a relatively gas impermeable material to said substrate; d. applying a layer of cross-linkable material to said impermeable layer thereby forming a laminate having layers of cross-linked substrate, unirradiated impermeable material, and cross-linkable material; e. stretching said laminate thereby thinning same to a predetermined film thickness; and, f. irradiating said laminate to a dosage level of at least 2.5 MR.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein said substrate is a polyolefin material.
Claim 6
Dependent Claim
21 words
The method of claim 3 wherein said polyolefin substrate is selected from the group comprising polyethylene and ethylene vinyl acetate copolymers.
Claim 7
Dependent Claim
22 words
The method of claim 2 wherein said impermeable material is selected from the group consisting of saran and ethylene vinyl alcohol copolymers.
Claim 8
Dependent Claim
13 words
The method of claim 2 wherein said cross-linkable material is a polyolefin material.
Claim 9
Independent Claim
100 words
A method of improving the properties of polymeric film laminates comprising the steps of: a. providing a tubular polyolefin substrate; b. irradiating said substrate to a dosage in the range between 2 and 20 MR; c. extrusion coating said tubular substrate with a layer of saran; d. extrusion coating said saran layer with a layer of polyolefin material thereby forming a tubular laminate having an inner layer of irradiated polyolefin coated with unirradiated saran and polyolefin layers; e. stretching said laminate to thin same to film thickness; and, f. irradiating said laminate to a dosage of at least 2.5 MR.
Claim 10
Independent Claim
100 words
A method of improving the properties of polymeric film laminates comprising the steps of: a. providing a tubular polyolefin substrate; b. irradiating said substrate to a dosage in the range between 2 and 20 MR; c. extrusion coating said tubular substrate with a layer of saran; d. extrusion coating said saran layer with a layer of polyolefin material thereby forming a tubular laminate having an inner layer of irradiated polyolefin coated with unirradiated saran and polyolefin layers; e. stretching said laminate to thin same to film thickness; and, f. irradiating said laminate to a dosage of at least 2.5 MR.
Claim 11
Dependent Claim
13 words
The method of claim 7 wherein said substrate comprises a polymer of ethylene.
Claim 12
Dependent Claim
13 words
The method of claim 8 wherein said substrate comprises an ethylene-vinyl acetate copolymer.
Claim 13
Dependent Claim
20 words
The method of claim 7 wherein the coating of polyolefin material comprises a blend of polybutene-1 with an ethylenepropylene copolymer.
Claim 14
Independent Claim
54 words
A method of improving the properties of polyolefin/saran film laminate which has been prepared by cross-linking said polyolefin layer and applying a saran layer thereto, said method comprising the steps of: a. stretching said laminate to a predetermined film thickness; and, b. irradiating said laminate to a dosage level of at least 2.5 MR.
Claim 15
Independent Claim
54 words
A method of improving the properties of polyolefin/saran film laminate which has been prepared by cross-linking said polyolefin layer and applying a saran layer thereto, said method comprising the steps of: a. stretching said laminate to a predetermined film thickness; and, b. irradiating said laminate to a dosage level of at least 2.5 MR.
Claim 16
Dependent Claim
17 words
The method of claim 11 wherein the initially cross-linked layer of said laminate comprises an ethylene polymer.
Claim 17
Dependent Claim
15 words
The method of claim 12 wherein said initially cross-linked layer comprises an ethylene/vinyl acetate copolymer.
Claim 18
Dependent Claim
27 words
A polymeric film laminate comprising a plurality of cross-linked layers, at least one of said layers being cross-linked to a greater degree than any other cross-linked layer.
Claim 19
Dependent Claim
27 words
A polymeric film laminate comprising a plurality of cross-linked layers, at least one of said layers being cross-linked to a greater degree than any other cross-linked layer.
Claim 20
Dependent Claim
55 words
A film laminate prepared according to the process of claim 11 comprising: a. at least one polyolefin layer, said layer being cross-linked by irradiation; b. at least one saran layer, said layer having been cross-linked by irradiation; and, c. at least one of said layers being cross-linked to a greater extent than any other layer.
Claim 21
Dependent Claim
42 words
A film laminate prepared according to the process of claim 1 comprising: a. a relatively gas impermeable layer; and, b. a plurality of cross-linked polyolefin layers, at least one polyolefin layer being cross-linked to a greater extent than any other polyolefin layer.
Claim 22
Dependent Claim
13 words
The laminate of claim 16 wherein one of said polyolefin layers is polyethylene.
Claim 23
Dependent Claim
16 words
The laminate of claim 16 wherein one of said polyolefin layers is an ethylene-vinyl acetate copolymer.
Claim 24
Dependent Claim
15 words
The laminate of claim 18 wherein another of said polyolefin layers comprises an ethylene-propylene copolymer.
Claim 25
Dependent Claim
27 words
The laminate of claim 16 wherein the material for said relatively gas impermeable layer is selected from the group consisting of saran and ethylene vinyl alcohol copolymers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |