US5035941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-static multilayer laminate comprising a non-woven layer extrusion coated with polymeric laminae, and method of making the same
Assignee: Abandaco Inc
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Filing: 1989-08-22
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Granted: 1991-07-30
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Expires: 2009-08-22
Abstract
Abstract A multilayer laminate comprising: (a) a substrate layer of fibrous material; (b) an intermediate layer of polymeric material which is free of anti-static material and is extrusion laminated to the substrate layer; and (c) an outer layer of polyethylene containing anti-static material and including low density polyethylene and linear low density polyethylene, which is coextruded with and extrusion laminated to the intermediate layer. Also disclosed is an appertaining process for making a multilayer laminate. The laminate of the invention has particular utility in the fabrication of protective garment articles, for use in applications involving exposure to flammable or explosive environmental constituents which are susceptible to ignition by static discharge.
Inventors
- 👤 William A. Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:30
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; A; A41; A41D; A41D31/00; A41D31/04; A41D31/26; A41D31/265; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0014; B29C48/16; B29C48/18; B29C48/21; B32B27/18; B32B27/32; B32B37/00; B32B37/14; B32B37/15; B32B37/153; B29C48/03; B29C48/07; B29C48/08; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2307/00; B32B2307/20; B32B2307/21; B32B2323/00; B32B2323/04; B32B2323/046; B32B2437/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T442/00; Y10T442/60; Y10T442/674; Y10T442/678; Y10T442/681
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
70 words
A multilayer laminate, comprising: (a) a substrate layer of non-woven material; (b) an intermediate layer of polymeric material which is free of anti-static material and which is extrusion laminated to the substrate layer; and (c) an outer layer of polyethylene which contains an anti-static material and comprises low density polyethylene and linear low density polyethylene, and which is co-extruded with and extrusion laminated to the intermediate layer of polymeric material.
Claim 2
Dependent Claim
70 words
A multilayer laminate, comprising: (a) a substrate layer of non-woven material; (b) an intermediate layer of polymeric material which is free of anti-static material and which is extrusion laminated to the substrate layer; and (c) an outer layer of polyethylene which contains an anti-static material and comprises low density polyethylene and linear low density polyethylene, and which is co-extruded with and extrusion laminated to the intermediate layer of polymeric material.
Claim 3
Dependent Claim
28 words
A multilayer laminate according to claim 1, wherein the amount of linear low density polyethylene in the outer layer is sufficient to substantially completely eliminate pinhole formation therein.
Claim 4
Dependent Claim
36 words
A multilayer laminate according to claim 1, wherein the amount of linear low density polyethylene in the outer layer is from about 5 to about 50% by weight, based on the total weight of polyethylene therein.
Claim 5
Dependent Claim
36 words
A multilayer laminate according to claim 1, wherein the amount of linear low density polyethylene in the outer layer is from about 10 to about 30% by weight, based on the total weight of polyethylene therein.
Claim 6
Dependent Claim
36 words
A multilayer laminate according to claim 1, wherein the amount of linear low density polyethylene in the outer layer is from about 10 to about 25% by weight, based on the total weigh of polyethylene therein.
Claim 7
Dependent Claim
36 words
A multilayer laminate according to claim 1, wherein the intermediate layer is formed of a material selected from the group consisting of polyethylene, ethylene vinyl alcohol polymers and copolymers, and ethylene vinyl acetate polymers and copolymers.
Claim 8
Dependent Claim
21 words
A multilayer laminate according to claim 1, wherein the laminate has a Blackburn Delamination Test value of at least 7 psi.
Claim 9
Dependent Claim
14 words
A multilayer laminate according to claim, wherein the substrate layer non-woven material is polypropylene.
Claim 10
Dependent Claim
16 words
A multilayer laminate according to claim 1, wherein the substrate layer non-woven material is spunbonded polypropylene.
Claim 11
Dependent Claim
14 words
A multilayer laminate according to claim 1, wherein said outer layer is substantially pinhole-free.
Claim 12
Dependent Claim
15 words
A multilayer laminate according to claim 1, wherein the intermediate layer is formed of polyethylene.
Claim 13
Dependent Claim
23 words
A multilayer laminate according to claim 1, wherein the intermediate layer comprises a blend of low density polyethylene and linear low density polyethylene.
Claim 14
Dependent Claim
26 words
A multilayer laminate according to claim 1, wherein the thickness of each of the intermediate and outer layers is from about 0.5 to about 1 mil.
Claim 15
Dependent Claim
10 words
A garment comprising a multilayer laminate according to claim 1.
Claim 16
Dependent Claim
88 words
A process for making a multilayer laminate, comprising: providing a substrate layer of non-woven material; coextruding from separate feed source polymeric materials, and extrusion laminating with the substrate layer, polymeric layers including an intermediate layer and an outer polymeric layer, wherein said outer layer comprises a blend of low density polyethylene and linear low density polyethylene; and incorporating in said feed source polymeric material for said outer polymeric layer an anti-static material, while maintaining said feed source polymeric material for said intermediate layer substantially free of anti-static material.
Claim 17
Dependent Claim
88 words
A process for making a multilayer laminate, comprising: providing a substrate layer of non-woven material; coextruding from separate feed source polymeric materials, and extrusion laminating with the substrate layer, polymeric layers including an intermediate layer and an outer polymeric layer, wherein said outer layer comprises a blend of low density polyethylene and linear low density polyethylene; and incorporating in said feed source polymeric material for said outer polymeric layer an anti-static material, while maintaining said feed source polymeric material for said intermediate layer substantially free of anti-static material.
Claim 18
Dependent Claim
20 words
A process according to claim 15, comprising maintaining laminar flow rates of said polymeric melt materials in said coextruding step.
Claim 19
Dependent Claim
29 words
A process according to claim 15, wherein said feed source polymeric melt material for said intermediate layer comprises a blend of low density polyethylene and linear low density polyethylene.
Claim 20
Dependent Claim
14 words
A process according to claim 15, wherein said substrate layer is a non-woven web.
Claim 21
Dependent Claim
15 words
A process according to claim 15, wherein said substrate layer is a non-woven polypropylene web.
Claim 22
Dependent Claim
15 words
A process according to claim 15, wherein said substrate is a non-woven spunbonded polypropylene web.
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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |