Patent ID: 7259225

Claim:
A polyphosphazene polymer represented by formula 1: wherein, R represents CH 2 CH(CH 3 ) 2 , CH(CH 3 )C 2 H 5 or C 7 H 7 , R′ denotes CH 2 COOC 2 H 5 or CH(CH 3 )COOC 2 H 5 , and R″ denotes OC 2 H 5 , NHCH 2 COOC 2 H 5 , NHCH 2 COOC 7 H 7 , NHCH(CH 2 CH(CH 3 ) 2 )COOC 2 H 5 or NHCH(CH(CH 3 )C 2 H 5 )COOC 2 H 5 ; a and b are independently 0.1-1.9, c and d are independently 0-1.9, and a+b+c+d=2.0; n is an integer of 10-10000; and m is an integer of 10-50; and wherein if the molecular weight of HN—(CH 2 —CH 2 —O—) m —CH 3 is 550, then c is not 0.