Abstract A method for the preparation of incombustible composite materials having high inter-layer adhesive strength and small permanent compression distortion, the method comprising interposing between a layer of a polyvinyl chloride sheet and a layer of hardboard sheet an intermediate layer of a soft foam. The intermediate layer is prepared by covering a soft foam sheet with a latex of vinylidene chloride-based copolymer. The vinylidene chloride-based copolymer is obtained by copolymerization of 65 - 95 parts by weight of vinylidene chloride monomer, 5 - 35 parts by weight of a vinyl monomer not containing any unsubstituted corboxyl group and 1 - 10 parts by weight of a vinyl monomer containing at least one unsubstituted carboxyl group. The respective layers are bonded together by high frequency welding.
A method according to claim 1, wherein said first vinyl monomer is selected from vinyl chloride, acrylonitrile, methacrylonitrile, acrylic esters and methacrylic esters.
Claim 2
Dependent Claim
17 words
A method according to claim 1 wherein said second vinyl monomer is a dibasic unsaturated organic acid.
Claim 3
Dependent Claim
22 words
A method according to claim 3 wherein said dibasic unsaturated organic acid is selected from maleic acid, fumaric acid and itaconic acid.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said second vinyl monomer is a half-ester of a dibasic unsaturated organic acid.
Claim 5
Dependent Claim
22 words
A method according to claim 5 wherein said dibasic unsaturated organic acid is selected from maleic acid, furmaric acid and itaconic acid.
Claim 6
Dependent Claim
17 words
A method according to claim 1 wherein said second vinyl monomer is a monobasic unsaturated organic acid.
Claim 7
Dependent Claim
18 words
A method according to claim 7 wherein said monobasic unsaturated organic acid is acrylic acid or methacrylic acid.
Claim 8
Dependent Claim
10 words
A composite material obtained by the method of claim 1.