Chemical/biological protective garments and laminates

• US 7,937,772 B1
• Filed: 01/28/2010
• Issued: 05/10/2011
• Est. Priority Date: 01/28/2010
• Status: Active Grant

• Current Assignee: Lakeland Industries Incorporated
• Original Assignee: Lakeland Industries Incorporated
• Inventors: Smith, Novis, Roberson, Charles
• Primary Examiner(s): MUROMOTO JR, ROBERT H
• Application Number:
  US12/657,804
• Time in Patent Office: 467 Days
• Field of Search: 290/1, 227/2, 222/7, 2 9/3, 2 9/7, 2 8/5, 2 8/7, 2 7/9, 2 8/2, 2 6/9, 2 4/8, 2 4/94, 245/7, 245/6
• US Class Current: 2/69
• CPC Class Codes: A62D 5/00 Composition of materials for coverings or clothing affording protection against harmful chemical agents
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 5/22 characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed layer formed of natural mineral fibres or particles next to a foam layer B32B19/047, next to a layer made of particles B32B19/048, or next to a fibrous or filamentary layer B32B19/06; paper layer or cardboard layer next to a paper layer or cardboard layer B32B29/005, next to a foam layer B32B29/007, next to a fibrous or filamentary layer B32B29/02, or next to a particulate layer B32B29/04

Abstract

A breathable protective garment or laminate for protection against chemical and/or biologic agents which contains one or more scrim layers which contain anti-microbial and/or anti toxic chemical agents. The garment or laminate is also self-decontaminating.

Claims

1. Breathable chemical and biological agent protective garments and laminates comprising;

A) a non-absorbing thermoplastic top or outer layer of less than 1.0 oz/yd² in weight which provides a barrier against toxic liquids and slows gaseous penetration;

B) a first non-woven scrim layer which has been impregnated with an agent selected from the group consisting of at least one of anti-microbial agent and anti-toxic chemical agent,

C) a microporous thermoplastic layer having a surface energy of less than 75 dynes/cm bonded to said first scrim layer by a minimum amount of adhesive whereby an air gap is provided;

D) a second non-woven thermoplastic scrim layer which has been impregnated with an agent selected from the group consisting of anti-microbial agent and anti-toxic chemical agent, and

E) an intermediate microporous thermoplastic layer encasing said second scrim layer.

2. The protective garments and laminates of claim 1 wherein said outer layer is selected from the group consisting ethylene vinyl alcohol, nylon, ionomer and polyester.

3. The protective garments and laminates of claim 1 wherein said first scrim layer is impregnated with an anti-microbial agent selected from the group consisting of phenolic complex and a polyamine.

4. The protective garments and laminates of claim 3 wherein said polyamine is triethylene tetramine.

5. The protective garments and laminates of claim 1 wherein said first and second scrim layers are selected from the group consisting of spun bonded, melt blown and spunlaced thermoplastics.

6. The protective garments and laminates of claim 5 wherein said first and second scrim layers are selected from the group consisting of polyester, cellulosic, nylon, polypropylene and polyethylene.

7. The protective garments and laminates of claim 1 wherein said microporous thermoplastic layer of part C) is selected from the group consisting of nylon, polyethylene terephthalate, ethylene vinyl alcohol and ionomer.

8. The protective garments and laminates of claim 1 wherein said second non-woven thermoplastic scrim layer is impregnated with a different agent from that in said first non-woven scrim layer.

9. The protective garments and laminates of claim 1 wherein said scrim layers are plated with anti-microbial salts or powders.

10. The protective garments and laminates of claim 1 wherein said microporous thermoplastic layer of part E) is selected from the group consisting of ethylene vinyl alcohol, nylon, ionomer and polyester.

11. The protective garments and laminates of claim 10 wherein said polyester is polyethylene terephthalate.

12. The protective garments and laminates of claim 1 wherein said outer layer has a tie layer comprising linear low density polyethylene.

13. The protective garments and laminates of claim 1 wherein the layers are attached by a process selected from the group consisting of discontinuous adhesive bonding, point bonding, thermal bonding and ultrasonic bonding.

14. The protective garments and laminates of claim 1 which have tie layers.

15. The protective garments and laminates of claim 1 which are self-decontaminating.

16. A breathable chemical and biological agent protective garment comprising;

a) a top layer of a thermoplastic of less than 1.0 oz/yd² in weight selected from the group consisting of ethylene vinyl alcohol, nylon and polyethylene terephthalate which is a barrier against toxic substances;

b) a first non-woven scrim layer bonded to said top layer having incorporated therein at least one of an antimicrobial agent or an anti-toxic chemical agent, said scrim being melt blown, spunbonded or spunlaced thermoplastic;

c) a breathable microporous thermoplastic layer having a surface energy of less than 75 dynes/cm selected from the group consisting of ethylene vinyl alcohol, nylon, ionomer and polyethylene terephthalate bonded to said first scrim layer so as to provide an air gap to slow gaseous penetration, and

d) a second non-woven scrim layer bonded to said microporous thermoplastic layer to provide an air gap having incorporated therein an anti-microbial agent and anti-toxic chemical agent which is not incorporated in said first scrim layer;

e) a microporous thermoplastic layer bonded to said second non-woven scrim layer, and

f) a chemically reactive inner layer to tie up and fix toxic chemicals.

17. The protective garment of claim 16 which is self-decontaminating.