Liquid organic polyisocyanates containing carboxyl and/or carboxylate groups

Claim 1

Liquid aromatic polyisocyanates which contain carboxyl or carboxylated groups, prepared by a process which comprises reacting: A. a liquid multicomponent mixture of aromatic polyisocyanates which have an isocyanate content of 18 to 35% by weight and a viscosity of 8 cP to 10,000 cP at 25°C, said multicomponent mixture selected from the group consisting of: i. phosgenation products of the condensates of: a. aniline or alkyl groups substituted anilines, and b. aldehydes or ketones; ii. distillation residues obtained from the distillation of crude tolylene diisocyanate mixture and which residues contain less than about 50% by weight of free tolylene diisocyanate isomers; iii. reaction products of (i) or (ii) and 0.2 to 25 mol % of an organic polyol; iv. a mixture of (i) and from 1 to 30% by weight of an isocyanate selected from the group consisting of tolylene diisocyanate and 2,4'-diphenylmethane diisocyanate; and v. mixtures thereof, and B. a compound selected from the group consisting of: i. carboxylic acid salts of an hydroxycarboxylic or mercapto carboxylic acid; and ii. an hydroxy carboxylic or mercapto carboxylic acid wherein a. at least partial conversion of carboxyl group into the corresponding carboxylate group by neutralization with a base is carried out simultaneously with or after the isocyanate addition reaction, or b. the hydroxy carboxylic acid or mercapto carboxylic acid is of the kind which the carboxyl groups are much less reactive with isocyanate groups than are the hydroxy or mercapto groups, the product of said process having an isocyanate content of from 18 to 35% by weight and having a carboxyl or carboxylate group content of from 0.1 to 10% by weight.