Patent ID: 7671104

Claim:
A process for the production of a fine celled rigid polyurethane and/or polyisocyanurate foam comprising reacting a mixture consisting of: a) a polyisocyanate having an NCO content of from 20 to 48% by weight with b) a polyol component which is in the form of an emulsion having an average of at least two isocyanate-reactive groups consisting of (1) a polyol having a functionality of 2, (2) at least one polyol obtained by (i) polyaddition of at least one alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, dodecyl oxide and styrene oxide to a starter compound selected from the group consisting of (A) water, sucrose, sorbitol, pentaerythritol, trimethylolpropane, glycerol, propylene glycol, ethylene glycol, diethylene glycol, and mixtures thereof, (B) aliphatic amines selected from the group consisting of ethylene diamine, oligomers of ethylene diamine, ethanolamine, diethanolamine, triethanolamine, N-methyl-diethanolamine, N-ethyl-diethanolamine, 1,3-propylene diamine, 1,3-butylene diamine, 1,4-butylene diamine, 1,2-hexamethylene diamine, 1,3-hexamethylene diamine, 1,4-hexamethylene diamine, 1,5-hexamethylene diamine, and 1,6-hexamethylene diamine, (C) aromatic amines selected from the group consisting of phenylenediamines, 2,3-toluene diamine, 3,4-toluene diamine, 2,4-toluene diamine, 2,5-toluene diamine, 2,6-toluene diamine, and isomer mixtures of toluene diamine, 2,2′-diaminodiphenylmethane, 2,4-diaminodiphenylmethane, 4,4′-diaminodiphenylmethane and isomer mixtures of diaminodiphenylmethane, and/or (ii) esterification of (A) an acid selected from the group consisting of phthalic acid, fumaric acid, maleic acid, azelaic acid, glutaric acid, adipic acid, suberic acid, terephthalic acid, isophthalic acid, decanecarboxylic acid, malonic acid, glutaric acid, succinic acid and mixtures thereof, or (B) a dicarboxylic acid anhydride, or (C) a dicarboxylic acid mono-ester of an alcohol having from 1 to 4 carbon atoms, or (D) a dicarboxylic acid di-ester of an alcohol having from 1 to 4 carbon atoms, with (E) an alcohol selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,10-decanediol, glycerol, trimethylolpropane and mixtures of these alcohols, (3) water, (4) a catalyst, and (5) at least one material selected from the group consisting of surface active additives, foam stabilizers, cell regulators, reaction inhibitors, flame retardants, dyes, fillers, fungistatic agents, bacteriostatic agents, and combinations thereof.