Patent GB-684400-A (GB)
Title: Coating, impregnating, or adhesively uniting articles with polyester compositions
IPC: C09J175/06
Filed: 1949-05-30
Abstract: Articles are coated, impregnated or adhesively united by applying to them a composition comprising (1) a solution in an organic solvent of a polyisocyanate modified polyester and (2) a polyisocyanate; and allowing the composition to cure without the application of heat. The composition may be formed in situ by applying the solvent and modified polyester to one surface to be joined and the polyisocyanate (which may or may not be dissolved in a solvent) to the other. Specified solvents are acetone, benzene, chloroform, methyl ethyl ketone, trichloroethylene, ethyl acetate or mixtures containing these solvents.  Many polyester forming reactants and polyisocyanates are specified. Other ingredients are fillers, e.g. carbon black, clay, blanc fixe, titanium dioxide and mica; plastic materials, e.g. natural or synthetic rubber; plasticizers, e.g. tricresyl phosphate, dibutyl phthalate, butyl phthalyl butyl glycollate and N - alkyltoluenesulphonamides; stabilizers or anti-oxidants, e.g. the diphenyl-ortho-tolyl-guanidine salt of dicatechol borate, diphenylamine-acetone condensation products and diphenyl - para - phenylene - diamine; driers, e.g. lead or cobalt naphthenates, and materials which react with polyisocyanates, e.g. cellulose acetate, cellulose nitrate, cellulose ethers, viscose, casein, zein, soya-protein, polyvinyl alcohol, polyvinyl acetals, and wood flour. Materials which may be united include cotton, cellulose acetate, wool, polyhexamethylene adipamide, paper, leather and natural or synthetic rubbers, e.g. polyisocyanate modified polyesters or polyesteramides.  Alternatively the composition may be used to fabricate into shapes, e.g. cork, leather, or wood dust; or asbestos, wool or cotton fibres.  In examples: (1) a polyisocyanate modified polyester prepared from adipic acid, phthalic anhydride, ethylene glycol and hexamethylene diisocyanate is dissolved in a mixture of benzene and acetone and a solution of diphenylmethane-4 : 41-diisocyanate in xylene added.  The solution is used to join rubber or leather surfaces. (2) The modified polyester of example (1), titanium dioxide, copper phthalocyanine and a solution of diphenylmethane-4 : 41-diisocyanate in xylene are stirred into a mixture of acetone, methyl ethyl ketone, benzene and ethyl acetate and sprayed on to rubber.  (3) To a pigmented solution comprising a polyisocyanate modified polyester, cellulose nitrate, tricresyl phosphate, titanium dioxide, the red pigment obtained by diazotizing a mixture of 3 : 31-dichlorobenzidine and dianisidine and coupling this with 1-p-tolyl-3-methyl-5 pyrazolone, ethyl acetate and acetone is added a solution of diphenylmethane-4 : 41-diisocyanate in xylene. The mixture is applied to a cotton fabric coated with natural rubber. The modified polyester is prepared from dimethyl terephthalate, ethylene glycol, adipic acid and hexamethylene diisocyanate.  (4) The modified polyester of example (3) is mixed with cellulose nitrate, tricresyl phosphate, acetone and ethyl acetate.  To this solution is added a toluene solution of meta-toluylene diisocyanate and the lacquer is applied to paper.  According to the Provisional Specification an unmodified polyester may be used instead of the solvent soluble polyisocyanate modified polyester. Specification 579,340 is referred to.