Synthetic polymers by polyisocyanate polyaddition process

A process for preparing a synthetic polymer from a reaction mixture substantially free of polyalkylene ether glycols or polyols and acidic reaction rate-controlling amine salt-forming agents, said process comprising reacting a polyisocyanate with substantially an equivalent amount of an oligomeric p-aminobenzoic acid or amide having the formula ##STR48## wherein n is an integer 2 to 4;

• each x is one or two;
• each benzoyl nucleus is para-, meta-, or di-meta- amino-substituted;
• each Z is ##STR49## and G is an n-valent radical obtained by removal of hydroxyl groups or amino groups from an n-valent polyol or polyamine having a molecular weight of from about 400 to about 6,000.

A synthetic polymer which consists essentially of the reaction product of a polyisocyanate and substantially an equivalent amount of an oligomeric aminobenzoic acid ester or amide having the formula ##STR58## wherein n is an integer from 2 to 4;

• each x is one or two;
• each benzoyl nucleus is para-, meta- or di-meta- amino-substituted;
• each Z is ##STR59## and G is an n-valent radical obtained by removal of hydroxy groups or amino groups from an n-valent polyol or polyamine having a molecular weight of from about 400 to about 6,000.

A process for preparing a synthetic polymer which comprises reacting a mixture which consists essentially of a polyisocyanate and substantially an equivalent amount of an oligomeric aminobenzoic acid or amide having the formula ##STR61## wherein n is an integer from 2 to 4;

• each x is one or two;
• each benzoyl nucleus is para-, meta- or di-meta- amino-substituted;
• each Z is ##STR62## and G is an n-valent radical obtained by removal of hydroxy groups or amino groups from an n-valent polyol or polyamine having a molecular weight of from about 400 to about 6,000.