Patent GB-793303-A (GB)
Title: Heatsealing adhesive sheets or tapes
IPC: C09J7/35
Filed: 1954-08-20
Abstract: A composition suitable as an adhesive comprises a polymer and from 5 to 80 per cent by weight of the mixture of a crystalline plasticiser having a melting-point above 60 DEG  C.  The composition may also contain liquid plasticisers, fillers, antioxidants, and stabilizers. Polymers exemplified are styrene-isobutylene copolymer, polyethylene, butadiene-acrylonitrile copolymer, polychloroprene, vinyl chloride-acetate copolymers, vinylidene chloride-acrylonitrile copolymer, polyvinyl butyral, polyvinyl isobutyl ether, and high M.W. copolymers of vinyl chloride and 2-ethyl maleate.  Solid plasticisers exemplified are acetanilide, diphenyl-alpha-beta-diketone, diphenyl phthalate, N,N-dicarboxyl benzene sulphonamide, acetoacet-o-chloranilide, dimethyl-beta, beta1-sulphonyl dipropionate, octachloronaphthalene, heptachloronaphthalene and diphenoxy ethyl fumarate, trimethyl citrate, N-cyclohexyl paratoluene sulphonamide, benzyl sulphonamide, acetoacetanilide, mixture of ortho- and paratoluene sulphonamides, sucrose octa-acetate, N,N-dibetahydroxyethyl toluene sulphonamide, N,N - dicyanoethyl benzenesulphonamide, benzenesulphonamide, acetoacet - o - toluidide. Liquid plasticisers which may also be added and exemplified are :-N - ethyl benzenesulphonamide, dibenzyl sebacate, polypropylene glycol sebacate, butyl ricinoleate, di-2-ethyl hexyl phthalate. Lubricants exemplified are:-stearic acid and calcium stearate. Fillers exemplified are :-titanium dioxide, carbon black, refined calcium carbonate and ultramarine blue, zinc oxide, lead oxide, clay and magnesium carbonate.  Antioxidants and stabilizers which may be added include lead oxide, and hydroxide condensation products of urea, aliphatic esters of acetoxy chloride stearic acids, tertiary ethyl urea, tertiary amyl urea or tertiary butyl urea, phthalimides, sulphonamides such as sodium and magnesium sulphonamides, calcium ethyl acetal acetate, lead stearate, lead oleate, diphenyl lead stearate, diphenyl lead oleate, tribenzyl lead stearate, tribenzyl lead oleate, tribenzyl lead ricinoleate, diphenyl tin oxide, diphenyl lead oxide, triphenyl lead stearate, triphenyl basic tin stearate, ethyl benzidine, calcium stearate, phenyl-beta-naphthalylamine, mixtures of mono- and di-heptyl diphenyl-amines, barium ricinoleate, dibasic lead phosphite and cadmium octoate.  Specification 624,620 is referred to.ALSO:A heat sealing sheet or tape comprises a flexible base material coated with a mixture comprising a polymer and from 5 to 80 per cent by weight of a mixture of a crystalline plasticizer having a melting point above 60 DEG C., preferably above the boiling point of water, the plasticizer and the polymer being so selected that they are substantially insoluble in one another and form a heterogeneous mixture below the melting point of the plasticizer, substantially soluble in each other when raised to a temperature above the said melting point, and when cooled to a temperature below said melting point return substantially immediately to the solid heterogeneous and non-tacky state.  Polymers exemplified are crude rubber and chlorinated natural rubber (67 per cent chlorine).  Solid plasticizers exemplified are acetanilide and acetoacet-o-chloranilide.  Liquid plasticizers may also be added and lubricants, e.g., stearic acid, Carbon black, anti-oxidants and stabilizers may be added.  Specification 624,620 [Group IV(a)] is referred to.