Patent GB-899222-A (GB)
Title: Improvements in or relating to the manufacture of foamed polyurethane products
Inventor: HARTLEY FRANK DESMOND
IPC: C08G18/40
Filed: 1959-03-06
Abstract: A process for the manufacture of foamed cellular materials by interaction in one or more stages of organic polyisocyanates with hydroxyl group-containing polymers and, as necessary, water and/or catalysts, is characterized in that there is incorporated in the reaction mixture from which the foam is made a block copolymer which contains at least one isocyanate-reactive group per molecule and which is a block copolymer of ethylene oxide and a cyclic oxide which when homopolymerized produces a hydrophobic chain.  The hydrophobic chain-producing cyclic oxide may be, for example, 1:2-propylene oxide, 1:2- or 1:3-butylene oxide, tetrahydrofuran or oxacyclobutane. The initiator for the block copolymer may be water, diethylene glycol, iso-octanol, diethylene glycol monoethyl ether, isopropanol, phenol, sec. butanol, a monocarboxylic acid, a secondary amine such as methylaniline or cetylethylamine, glycerol, trimethylol-ethane or propane, triethanolamine, diethanolamine, pentaerythritol and sorbitol. Catalysts for the foam-forming reactions are tertiary amines, other basic materials such as potassium acetate and non-basic metallic compounds such as ferric acetyl acetonate.  The block copolymer may be dissolved in one of the reactants or added as a solution in, for example, tri(b -chlorethyl) phosphate.  There may also be added pigments, plasticizers, surface-active agents, litharge and barium oxide.  In typical examples foams are obtained by reacting (1) a polyester from pentaerythritol, 1:3-butylene glycol, adipic acid and phthalic anhydride; b -trichlorethyl phosphate; water; an octylcresol/alkylene oxide condensation product and a 4:41-diisocyanato-3-methyldiphenyl methane composition (containing some triisocyanate) with which a block copolymer of a propylene oxide and ethylene oxide has been incorporated; (14) a prepolymer from polypropylene glycol and 2:4- and 2:6-toluene diisocyanates; octylcresol/ethylene oxide condensate; dimethylcyclohexylamine; a block copolymer of ethylene oxide with an oxypropylated diethylene glycol monoethyl ether; and water.  Specifications 731,603 and 825,896 are referred to.ALSO:A process for the manufacture of foamed cellular materials by interaction in one or more stages of organic polyisocyanates with hydroxyl group-containing polymers and, as necessary, water and/or catalysts, is characterized in that there is incorporated in the reaction mixture from which the foam is made a block copolymer which contains at least one isocyanate-reactive group per molecule and which is a block copolymer of ethylene oxide and a cyclic oxide which when homopolymerized produces a hydrophobic chain. The hydrophobic chain-producing oxide may be, for example, 1:2 propylene oxide, 1:2 or 1:3-butylene oxide, tetrahydrofuran, or oxacyclobutane.  The initiator for the block copolymer may be water, diethylene glycol, iso-octanol, diethylene glycol monoethyl ether, isopropanol, phenol, see butanol, a monocarboxylic acid, a secondary amine such as methylaniline or cetylethylamine, glycorol, trimethylol-ethane or propane, triethanolamine, diethanolamine, pentaerythritol and sorbitol. Catalysts for the foam-forming reaction are tertiary amines other basic materials such as potassium acetate and non-basic metallic compounds such as ferric acetylacetonate.  The block copolymer may be dissolved in one of the reactants or added as a solution in, for example, tri (b  chlorethyl) phosphate.  There may also be added pigments, plasticizers, surface-active agents, litharge and barium oxide.  In typical examples foams are obtained by reacting (1) a polyester from pentaerythritol, 1:3-butylene glycol, adipic acid and phthalic anhydride; tri-b -chlorethyl phosphate; water, an octylcresol/alkylene oxide condensation product and a 4.41-diisocyanate-3-methyl-diphenylmethane composition (containing some triisocyanate) with which a block copolymer of propylene and ethylene oxides has been incorporated; (14) a prepolymer from polypropylene glycol and 2:4-and 2:6-toluene diisocyanates, octylcresol/ethylene oxide condensate; dimethylcyclo-hexylamine, a block copolymer of ethylene oxide with an oxypropylated diethylene glycol monoethyl ether; and water. Specifications 731,603 and 825,896 are referred to.