Patent GB-690867-A (GB)
Title: Improvements in and relating to heat sealing adhesives
IPC: C09J7/35
Filed: 1949-12-19
Abstract: A heat-sealing adhesive composition comprises a major proportion of a polymeric constituent consisting mainly of one or more polymers of a molecular weight of 30,000-70,000 as determined by the osmotic method, and a minor proportion of a viscous liquid plasticizer which is a polymeric ester of a dihydric alcohol with a dibasic acid, the polymeric constituent being an interpolymer of vinyl chloride with minor amounts of vinyl acetate, vinyl alcohol, vinylidene chloride, maleic anhydride and/or acrylonitrile, or an interpolymer of vinylidene chloride with acrylonitrile or a substituted acrylonitrile, such as methacrylonitrile.  The polyester plasticizer, which preferably has a molecular weight of 1700 to 20,000 as determined by the osmotic method, may be prepared from acids such as adipic, pimelic, suberic, azelaic, sebacic, undecanedioic, duodecanedioic, tridecanedioic, and/or tetradecanedioic acids, with dihydric alcohols such as ethylene glycol, 1,2-propylene glycol, trimethylene glycol, heptamethylene glycol, and/or diethylene glycol. The compositions may be prepared with the aid of solvents such as toluene and methyl isobutyl ketone, and may contain other polymeric constituents of molecular weights higher or lower than specified above, other plasticizers such as dimethyl, diethyl, diamyl, dicapryl, di-n-octyl, methoxyglycol, ethoxyglycol, butoxyglycol, cyclohexyl-butyl, ethoxydiglycol dicyclohexyl, di-2-ethylhexyl, dimethoxy ethyl, triglycol chlorhydrin, and diphenyl phthalates, dibenzyl sebacate, dioctyl sebacate, dioctyl adipate, dibutoxy ethyl adipate, triglycol di-2-ethyl hexoate, butoxy glycol adipate, dibutyl sebacate, butylstearate, dibutyl tartrate, triglycol di-2-ethyl butyrate, ethyl o-benzoyl benzoate, diglycol dipropionate, methoxy ethyl acetyl ricinoleate, methyl acetyl ricinoleate, methoxyglycol acetyl ricinoleate, the butyl ester of acetylated polymerized ricinoleic acid, methoxyglycol sebacate, methoxyglycol stearate, ethyl phthalyl ethyl glycollate, butyl phthalyl butyl glycollate, methyl phthalyl ethyl glycollate, methyl phthalyl methyl glycollate, di-(methylcyclohexyl) adipate, triethyl citrate, tributyl citrate di-2-ethyl butyl azelate, methyl dihydroabietate, tricresyl phosphate, triphenyl phosphate, diphenyl o-xenyl phosphate, tri-(p-tert.-butylphenyl) phosphate, di-2-ethylhexyl phenyl phosphonate, di-2-ethylhexyl phosphonate, di-2-ethylhexyl styryl phosphonate, di - 2 - ethylhexyl iso-octenyl phosphonate, chlorinated diphenyls, o- and p-toluene ethyl sulphonamides, octadiene and octadecadiene nitriles, phenol-indene-coumarone oil, and o-nitrobiphenyl, fillers such as zinc oxide, titanium dioxide, lead oxide, calcium carbonate, clay, and magnesium carbonate, and stabilizers such as basic lead carbonate, blue basic lead sulphate, white basic lead sulphate, lead orthosilicate and silica gel coprecipitated, normal lead salicylate, tribasic lead maleate monohydrate, dibasic lead phthalate, dibasic lead stearate, lead oleate, diphenyl lead stearate, diphenyl lead oleate, tribenzyl lead stearate, tribenzyl lead ricinoleate, diphenyl lead oxide, triphenyl lead stearate, lead oxide and hydroxide condensation products of urea, the aliphatic esters of acetoxy chlorostearic acids, tert.-alkyl ureas such as tert.-butyl urea and tert.-amyl urea, phthalimides, sulphonimides such as sodium and magnesium sulphonimides, calcium acetyl acetate, diphenyl oxide, dibutyl tin oxide, dibutyl tin dilaurate, dibutyl tin diacetate, dibutyl tin maleate, triphenyl basic tin stearate, barium ricinoleate, strontium salicylate, phenyl phosphinic acid, calcium stearate, and ethyl benzidine.  The adhesive compositions may be applied to backings of paper, cloth, or aluminium.  Specification 586,826 is referred to.