Patent ID: 6302993
Filing Date: 2001-10-16
Classification: C09J

Abstract:
a process for bonding an optically transparent plastic facepiece onto a protective garment fabric material wherein said garment fabric material and said facepiece each consists of flexible material, which is chemically dissimilar from each other, comprising the steps of:a. Applying an olefin terpolymer strip comprising from about 60 to 90 weight percent olefin monomers, from about 0.2 to 2.5 weight percent of an ethylenically unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, maleic acid and maleic anhydride, and about 0.1 to 10 weight percent of an ester selected from the group consisting of methyl acrylate, methylmethacrylate, vinyl acetate, and alkyl acetate along edges of a first side of said facepiece;b. Placing said garment fabric material which consists of a spun bonded non-woven polyethylene web laminated or coated with at least one layer of a member selected from the group consisting of ethylene/vinyl acetate copolymer, ethylene/vinyl alcohol co-polymer, polyethylene homopolymer and vinylidene chloride, vinyl chloride co-polymer in contact with a second side of said facepiece, where said second side is opposite from said first side, and then,c. Heating the composite formed by steps a and b to an effective temperature to cause said garment fabric material to flow about said edges of said facepiece to form a fusion bond seam, and then placing the composite under pressure for a dwell period until a chemically resistant liquid and gas impervious seal, which is free of adhesive failure is formed about said edges of said facepiece; and wherein said olefin terpolymer strip has a melting point less than 220.degree. F.