US4924525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer film for chemical protective clothing
Assignee: Kappler Safety Group
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Filing: 1988-05-16
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Granted: 1990-05-15
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Expires: 2008-05-16
Abstract
Abstract An improved chemical protective garment is provided by first forming a multilayer film structure having an inner layer of substantially isotactic oriented polypropylene homopolymer sandwiched between a layer of ethylene-propylene random copolymer and a layer of ethylene-vinyl acetate. The multilayer film structure is then bonded to a two-layer polyester substrate using an elastomeric adhesive. In a preferred embodiment, a barrier material having a layer of ethylene-vinyl alcohol is combined with the multilayer film structure to form a composite, which is then combined with the substrate.
Inventors
- 👤 James E. Bartasis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:14
CPC Classifications
A; A41; A41D; A41D31/00; A41D31/04; A41D31/18; A41D31/185; A41D27/00; A41D27/24; A41D27/245; A62; A62B; A62B17/00; A62B17/006; A62D; A62D5/00; B; B29; B29C; B29C65/00; B29C65/02; B29C65/10; B29C65/18; B29C65/48; B29C65/50; B29C65/5007; B29C65/5021; B29C65/5042; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/114; B29C66/1142; B29C66/13; B29C66/137; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/729; B29C66/7294; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/12; B32B27/32; B32B7/00; B32B7/04; B32B7/12; B29C65/20; B29C65/4805; B29C65/481; B29C65/4815; B29C65/483; B29C65/5028; B29C66/7234; B29C66/73; B29C66/739; B29C66/7392; B29C66/7394; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083; B29K2023/086; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; B29L; B29L2009/00; B29L2031/00; B29L2031/768; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2305/00; B32B2305/10; B32B2305/20; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10; B32B2437/00; Y; Y10; Y10S; Y10S2/00; Y10S2/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
38 words
A material for a chemical protective garment comprising: (a) a film comprising a layer of oriented polypropylene homopolymer which is at least about 90% isotactic; and (b) a substrate laminated to said first film comprising a polyester layer.
Claim 2
Dependent Claim
38 words
A material for a chemical protective garment comprising: (a) a film comprising a layer of oriented polypropylene homopolymer which is at least about 90% isotactic; and (b) a substrate laminated to said first film comprising a polyester layer.
Claim 3
Dependent Claim
12 words
The material of claim 1 wherein said polypropylene layer is biaxially oriented.
Claim 4
Dependent Claim
15 words
The material of claim 1 wherein said film further comprises a polymer heat seal layer.
Claim 5
Dependent Claim
16 words
The material of claim 3 wherein said polymer heat seal layer comprises a random ethylene-propylene copolymer.
Claim 6
Dependent Claim
18 words
The material of claim 4 wherein said ethylene-propylene copolymer comprises between about 93-97% propylene and about 3-7% ethylene.
Claim 7
Dependent Claim
14 words
The material of claim 1 wherein said film further comprises a primary adhesive layer.
Claim 8
Dependent Claim
13 words
The material of claim 6 wherein said primary adhesive layer comprises ethylene-vinyl acetate.
Claim 9
Dependent Claim
14 words
The material of claim 6 wherein said film further comprises a secondary adhesive layer.
Claim 10
Dependent Claim
14 words
The material of claim 8 wherein said secondary adhesive layer comprises an elastomeric adhesive.
Claim 11
Dependent Claim
34 words
The material of claim 1 wherein said substrate comprises: (a) a layer of nonwoven polyester adjacent to said film; and (b) a layer of spun bonded polyester adjacent to said layer of nonwoven polyester.
Claim 12
Dependent Claim
25 words
The material of claim 1 wherein said film further comprises a second film including a layer of ethylene-vinyl alcohol bracketed between two moisture-resistant adhesive layers.
Claim 13
Dependent Claim
21 words
The material of claim 11 wherein said ethylene-vinyl alcohol layer and said adhesive layers react chemically to form an interpolymer network.
Claim 14
Dependent Claim
32 words
The material of claim 11 wherein: (a) said second film is a five layer, high barrier film; and (b) the outer layer on each side of said second film is a-polyolefin material.
Claim 15
Dependent Claim
54 words
A material for a chemical protective garment comprising: (a) a first film comprising a layer of oriented polypropylene homopolymer; (b) a second film comprising a layer of ethylene vinyl alcohol bracketed between two moisture-resistant adhesive layers and combined with said first film to form a composite; and (c) a substrate laminated to said composite.
Claim 16
Dependent Claim
54 words
A material for a chemical protective garment comprising: (a) a first film comprising a layer of oriented polypropylene homopolymer; (b) a second film comprising a layer of ethylene vinyl alcohol bracketed between two moisture-resistant adhesive layers and combined with said first film to form a composite; and (c) a substrate laminated to said composite.
Claim 17
Dependent Claim
16 words
The material of claim 14 wherein said oriented polypropylene homopolymer is at least about 90% isotactic.
Claim 18
Dependent Claim
21 words
The material of claim 14 wherein said ethylene-vinyl alcohol layer and said adhesive layers react chemically to form an interpolymer network.
Claim 19
Dependent Claim
48 words
The material of claim 14 wherein said first film further comprises: (a) a layer of random ethylene-propylene copolymer; and (b) a layer of ethylene-vinyl acetate copolymer; (c) such that said oriented polypropylene homopolymer layer is positioned between said random ethylene-propylene copolymer layer and said ethylene-vinyl acetate copolymer layer.
Claim 20
Dependent Claim
31 words
The material of claim 14 wherein said second film further comprises two polyolefin layers positioned on both sides of said ethylene vinyl alcohol layer and joined thereto by said adhesive layers.
Claim 21
Dependent Claim
61 words
A multilayer film for a chemical protective garment comprising: (a) a layer of biaxially oriented polypropylene homopolymer which is at least 90% isotactic; (b) a layer of random ethylene-propylene copolymer comprising between about 93-97% propylene and about 3-7% ethylene; (c) layer of ethylene-vinyl acetate copolymer; and (d) said polypropylene layer sandwiched between said ethylene copolymer layer and said ethylene-vinyl acetate layer.
Claim 22
Dependent Claim
61 words
A multilayer film for a chemical protective garment comprising: (a) a layer of biaxially oriented polypropylene homopolymer which is at least 90% isotactic; (b) a layer of random ethylene-propylene copolymer comprising between about 93-97% propylene and about 3-7% ethylene; (c) layer of ethylene-vinyl acetate copolymer; and (d) said polypropylene layer sandwiched between said ethylene copolymer layer and said ethylene-vinyl acetate layer.
Claim 23
Dependent Claim
24 words
The multilayer film of claim 19 further comprising a barrier structure having a center layer of ethylene-vinyl alcohol bracketed between two moisture-resistant adhesive layers.
Claim 24
Dependent Claim
93 words
A protective garment for hazardous chemical environments comprising: (a) a segment of material having an edge; (b) said material segment including a multilayer film having an intermediate layer of substantially isotactic, biaxially oriented polypropylene homopolymer, a heat seal layer on one side of said oriented polypropylene layer, and an adhesive layer on an opposite side of said oriented polypropylene layer; (c) said material segment also including a substrate; (d) said multilayer film and said substrate being laminated together; and (e) said garment being effective to protect a worker in a hazardous chemical environment.
Claim 25
Dependent Claim
93 words
A protective garment for hazardous chemical environments comprising: (a) a segment of material having an edge; (b) said material segment including a multilayer film having an intermediate layer of substantially isotactic, biaxially oriented polypropylene homopolymer, a heat seal layer on one side of said oriented polypropylene layer, and an adhesive layer on an opposite side of said oriented polypropylene layer; (c) said material segment also including a substrate; (d) said multilayer film and said substrate being laminated together; and (e) said garment being effective to protect a worker in a hazardous chemical environment.
Claim 26
Dependent Claim
19 words
The protective garment of claim 21 further comprising an elastomeric adhesive layer between said multilayer film and said substrate.
Claim 27
Dependent Claim
40 words
The protective garment of claim 21 further comprising a five-layer, high barrier film adjacent to said multilayer film and laminated thereto, said high barrier film comprising a center layer of ethylene-vinyl alcohol bracketed between two layers of a moisture-resistant adhesive.
Claim 28
Dependent Claim
40 words
The protective garment of claim 22 wherein said substrate comprises: (a) an interface layer of nonwoven polyester adjacent to said elastomeric adhesive and laminated thereto; and (b) a layer of spun-bonded polyester adjacent to said interface layer and laminated thereto.
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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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |