Aqueous compositions of polyimides containing hetero-polysaccharide

Claim 1

A pseudoplastic aqueous suspension of a prepolymer powder prepared from: A. a imide group-containing compound chosen from the group consisting of: a. a bis-imide of the formula: ##STR14## in which D represents a divalent radical which has the formula: ##STR15## wherein Y represents H, CH 3 or Cl and m is equal to 0 or 1, and A represents a divalent organic radical containing 2 to 30 carbon atoms, and b. a mixture of a bis-imide of formula (I) and a monoimide of the formula: ##STR16## in which D is as defined above and R represents a hydrogen atom or a monovalent organic radical containing 1 to 20 carbon atoms, and B. an amino compound chosen from the group consisting of: a. one or more polyamines containing 2 to 5 primary or secondary amino groups, at least one of these groups being primary, b. a mixture comprising one or more polyamines as defined under a) and one or more primary and/or secondary mono-amines and/or one or more secondary polyamines, and c. a polyamine of the general formula: ##STR17## in which x represents a number from 0.1 to 2 and R' represents a divalent hydrocarbon radical with 1 to 8 carbon atoms, the suspension also comprising, based on the weight of the powder, 0.01 to 8% by weight of a heteropolysaccharide of very high molecular weight.