GB901307A - Improvements in or relating to the manufacture of polyurethane materials - Google Patents

Abstract

A process for the preparation of foamed polyurethane products by the interaction of organic polyisocyanates, water, polyethers and polyesters, is characterized in that the polyether has more than two carbon atoms in each repeating unit and at least two hydroxyl groups per molecule, the polyester in addition to having at least two hydroxyl and/or carboxyl groups per molecule contains carboxylic acid residues containing a chain of at least 11 consecutive carbon atoms, said acid residues being present to the extent of at least 40% by weight of the total carboxylic acid residues in the polyester, and the proportion of polyether used is between 30% and 95% by weight of the total weight of polyether and polyester. The polyether may be a polymerized cyclic oxide or a reaction product of a cyclic oxide with a compound containing more than two reactive hydrogen atoms, such as ammonia and compounds containing at least three groups selected from hydroxyl and primary and secondary amino groups. Preferably more than half the repeating units are oxypropylene units. The polyesters may be prepared from glycols or from polyols such as glycerol, sorbitol, polyallyl alcohol and triethanolamine. Some amino alcohol or diamine may also be present. As the acids with a chain of at least 11 carbon atoms there are specified ricinoleic acid, hydrolysed castor oil, dihydroxy stearic acid, hydroxy-acyloxystearic acid, hydroxylated soya bean or linseed oil acids, dioleic or trilinoleic acids, lauric, stearic, oleic and linoleic acids. Monocarboxylic acids are used in conjunction with branching components containing more than two reactive groups such as carboxyl, hydroxyl and amino groups per molecule. Blowing agents such as fluorinated alkanes may be included in the reaction mixture. In a typical example foam is obtained by reacting (1) a prepolymer from polypropylene glycol and mixed 2:4- and 2:6-tolylene diisocyanates; a polyester from diethylene glycol, pentaerythritol and polymerized acids consisting of C36 dicarboxylic and C54 tricarboxylic acids; 2,4- and 2,6-tolylene diisocyanates; and a mixture of N:N-dimethylcyclohexylamine, a p-octylphenol/ethylene oxide reaction product and water.ALSO:A process for the preparation of foamed polyurethane products by the interaction of organic polyisocyanates, water, polyethers and polyesters, is characterized in that the polyether has more than two carbon atoms in each repeating unit and at least two hydroxyl groups per molecule, the polyester in addition to having at least two hydroxyl and/or carboxyl groups per molecule contains carboxylic residues containing a chain of at least 11 consecutive carbon atoms, said acid residues being present to the extent of at least 40% by weight of the polyester, and the proportion of polyether used is between 30% and 95% by weight of the total weight of polyether and polyester. The polyether may be a polymerized cyclic oxide or a reaction product of a cyclic oxide with a compound containing more than two reactive hydrogen atoms, such as ammonia and compounds containing at least three hydroxyl and primary and secondary amino groups. Preferably more than half the repeating units are oxypropylene units. The polyesters may be prepared from glycols or from polyols such as glycerol, sorbitol, polyallyl alcohol and triethanolamine. Some aminoalcohol or diamine may also be present. As the acids with a chain of at least 11 carbon atoms there are specified ricinoleic acid, hydrolysed castor oil, dihydroxystearic acid, hydroxyacyloxystearic acids, hydroxylated soya bean or linseed oil acids, dioleic or trilinoleic acids, lauric, stearic, oleic and linoleic acids. Blowing agents such as fluorinated alkanes may be included in the reaction mixture. In an Example (1) a foam is obtained by reacting (1) a prepolymer from polypropylene glycol and mixed 2 : 4- and 2 : 6-tolylene diisocyanates; a polyester from diethylene glycol, pentaerythritol and polymerized acids consisting of C36 dicarboxylic and C54 tricarboxylic acids; 2: 4- and 2:6-tolylene diisocyanates; and a mixture of N : N- dimethyl cyclohexylamine, a p-octylphenol/ethylene oxide reaction product and water.