Patent GB-891995-A (GB)
Title: Polyurethane foams and the process for making same
IPC: C08G18/68
Filed: 1959-09-29
Abstract: A foamable composition comprises (A) a polyester derived from (i) an adduct of a hexahalocyclopentadiene and an unsaturated monocarboxylic compound, (ii) an alcohol containing at least three hydroxy groups, and (iii) an aliphatic dicarboxylic compound; (B) an organic polyisocyanate; and (C) a foaming agent which liberates gaseous products when reacted with (B).  The halogen of the hexahalocyclopentadiene may be chlorine, bromine and/or fluorine. Specified adducts are derived from hexachlorocyclopentadiene and acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, and ethyl acrylate. Specified alcohols are pentaerythritol, glycerol, trimethylol propane, trimethylol ethane, hexanetriol and butanetriol. Specified aliphatic dicarboxylic compounds are dimer acid, succinic acid, maleic anhydride, adipic acid, adipoyl chloride, azelaic acid, itaconic anhydride and fumaryl chloride.  Specified polyisocyanates are 2,4- and 2,6-tolylene diisocyanate; methylene-bis- (4-phenyl isocyanate); 3,31-bitolylene-4,41 diisocyanate; 3,31-dimethoxy-4,41-biphenylene diisocyanate; and naphthalene-1,5-diisocyanate.  Specified foaming agents are water, carboxylic acids and anhydrides, tertiary alcohols, formic acid, polymethylol phenols, polymethylol ureas, activated secondary alcohols, and b -hydroxy aldehydes.  Alcoholic foaming agents should be used in conjunction with a catalyst, e.g. sulphuric acid, phosphoric acid, nitric acid, hydrochloric acid, aluminium chloride, p-toluene sulphonic acid and chloro-sulphonic acid.  The composition may also comprise antimony oxide; fillers such as wood flour, clay, calcium sulphate and ammonium phosphate; dyes; fibrous glass, asbestos or synthetic fibres; and plasticizers such as tricresyl phosphate, and a methyl pentachlorostearate/epoxidized soy bean oil mixture.ALSO:A foamable composition comprises (A) a polyester derived from (i) an adduct of a hexahalocyclopentadiene and an unsaturated monocarboxylic compound, (ii) an alcohol containing at least three hydroxy groups, and (iii) an aliphatic dicarboxylic compound; (B) an organic polyisocyanate; and (C) a foaming agent which liberates gaseous products when reacted with (B).  The halogen of the hexahalocyclopentadiene may be chlorine, bromine and/or fluorine. Specified adducts are derived from hexachlorocyclopentadiene and acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, and ethyl acrylate. Specified alcohols are pentaerythritol, glycerol, trimethylol propane, trimethylol ethane, hexanetriol and butanetriol. Specified aliphatic dicarboxylic compounds are dimer acid, succinic acid, maleic anhydride, adipic acid, acipoyl chloride, azelaic acid, itaconic anhydride and fumaryl chloride.  Specified polyisocyanates are 2,4- and 2,6-tolylene diisocyanate; methylene-bis-(4-phenyl isocyanate); 3,31-bitolylene-4,41-diisocyanate; 3,31-dimethoxy- 4,41-biphenylene diisocyanate; and naphthalene-1,5-diisocyanate. Specified foaming agents are water, carboxylic acids and anhydrides, tertiary alcohols, formic acid, polymethylol phenols, polymethylol ureas, activated secondary alcohols, and b -hydroxy aldehydes. Alcoholic foaming agents should be used in conjunction with a catalyst, e.g. sulphuric acid, phosphoric acid, nitric acid, hydrochloric acid, aluminium chloride, p-toluene sulphonic acid and chloro-sulphonic acid.  The composition may also comprise antimony oxide; fillers such as wood flour, clay, calcuim sulphate and ammonium phosphate; dyes; fibrous glass, asbestos or synthetic fibres; and plasticizers such as tricresyl phosphate, and a methyl pentachlorostearate/epoxidised soy bean oil mixture.