Soluble hydrophilic polymers and process for producing the same

Claim 1

A solution for use as a blood plasma substitute or cosmetic or medicinal carrier comprising, in a physiological saline solution, a water soluble low molecular weight polymer comprising the polymerizate of at least one monomer selected from the group consisting of N-alkyl methacrylamides, N-hydroxyalkyl methacrylamides, N-alkyl acrylamides, N-hydroxyalkyl acrylamides, N,N-dialkyl acrylamides, and mono-esters of acrylic and methacrylic acids with di-, tri- and higher homologous polyethlene glycols wherein the alkyl radicals are selected from the group consisting of unsubstituted and substituted alkyl radicals, the substituents being selected from the group consisting of hydroxy, amino and alkoxy groups, said low molecular weight polymer having an average molecular weight in a range of 10,000 to 60,000 and containing up to 1% maximum of a fraction having a molecular weight above 100,000, said low molecular weight polymer being condensed with at least one bifunctional compound selected from the group consisting of diisocyanates, halides of dicarboxylic acids, phosgene and dialdehydes derived from dicarboxylic acids to form a condensation polymer having a molecular weight in a range of 60,000, to 240,000 and having cleavable cross-links.