Patent ID: 8530626

Claim:
A method to produce keratin elastomer, said method comprising: (1) reacting a diisocyanate with a blocking agent to form a diisocyanate having one —NCO group blocked by said blocking agent and one —NCO group unblocked, (2) reacting said diisocyanate having one —NCO group blocked by said blocking agent and one NCO group unblocked with keratin to form keratin urethane having one —NCO group blocked by said blocking agent, (3) then heating said keratin urethane having one —NCO group blocked by said blocking agent at about 100° to about 120° C. to form keratin urethane having —NCO group functionality, and (4) reacting said keratin urethane having —NCO group functionality with polyols or polyhydric alcohols to form keratin elastomer; wherein said keratin is in powder or hydrolysate form; and wherein said blocking agent is phenol.