Chain extenders

Details Chain extenders Chain extenders

2011-02-16

2011-12-20

Nutter, Nathan M (Department: 1766)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C528S044000, C528S059000, C552S301000

Reexamination Certificate

active

08080626

ABSTRACT:
This invention provides chain extender compositions. These compositions comprise(i) an aromatic primary diamine, and(ii) a component selected from the group consisting of:(a) an aliphatic secondary diamine;(b) an aliphatic primary diamine;(c) an aliphatic secondary diamine and an aliphatic primary diamine;(d) a diimine; and(e) a combination of any two or more of (a) through (d).When (ii) is (a), (a) has amino hydrocarbyl groups which are secondary or tertiary hydrocarbyl groups; when (ii) is (d), and (d) is an aromatic diimine, each imino hydrocarbylidene group has at least two carbon atoms. Processes for producing polyurethanes, polyureas, and polyurea-urethanes are also provided.

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