Polyurethane urea elastomers based on polycarbonate macrodiols

Abstract

Polyurethane urea elastomers with novel dissolution behavior and which are synthesized from polycarbonate macrodiols, diisocyanates and diamines and which can be prepared and dissolved in aqueous solvents. These elastomers have the advantage of being less of a physiological hazard, more resistant to common solvents and require less emulsifiers and dispersion aid.

What is claimed is: 
     
       1. Polyurethane urea elastomers corresponding to the formula: ##STR47## in which R represents the group ##STR48## where 40 to 100 percent by weight of A represents   --CH.sub.2 --CH.sub.2 --O--.sub.p CH.sub.2 --CH.sub.2 --     and 0 to 60 percent by weight of A represents --CH 2  -- q   where     p = 2 - 7,   q = 6 or 7,   n = 2 - 40,   R' represents a divalent C 6  -C 14  aromatic, C 4  -C 18  aliphatic or C 5  -C 20  -cycloaliphatic radical,   R" represents a divalent C 6  -C 14  aromatic, C 4  -C 18  aliphatic or C 5  -C 20  -cycloaliphatic radical, which may contain nitrogen as heteroatom, or a --NH--CO--NH-- r  R IV  -NH-- s  CO--NH-- group where     R iv  is a C 1  -C 10  aliphatic or C 5  -C 20  cycloaliphatic radical,   r = 0 or 1;   s = 0 or 1,   R"' represents H or a C 1  -C 6  aliphatic radical, and     k = 0 or 1,   m = 0 - 4,   x = 5 - 200   at least 20 mol % of R' or R" being .[.cycloaliphatic.]. ##STR49## radicals or at least 20 mol % of both R' and R" being .[.cycloaliphatic.]. ##STR50## radicals.   
     
     
       2. The product of claim 1 wherein R represents the group ##STR51## where 60 to 100 percent of A represents   --CH.sub.2 --CH.sub.2 --O--.sub.p CH.sub.2 --CH.sub.2 --     and 0 to 40 percent of A represents (CH 2 ) q  and at least 40 mol percent of R' or R" being .[.cycloaliphatic.]. ##STR52## radicals or at least 40 mol percent of R' and R" being .[.cycloaliphatic.]. ##STR53##