Chain extenders
View Patent ↗This invention provides chain extender compositions. These compositions comprise (i) an aliphatic secondary diamine, and (ii) a component selected from the group consisting of: (a) a cycloaliphatic primary diamine; (b) an aliphatic secondary diamine; (c) an aliphatic secondary diamine and an aliphatic primary diamine; (d) an aliphatic diimine; and (e) a combination of any two or more of (a) through (d), with the proviso that when (ii) is (a), (i) is a noncyclic aliphatic secondary diamine. Processes for producing polyurethanes, polyureas, and polyurea-urethanes are also provided.
1. A chain extender composition which comprises
(i) N,N′-di-(3,3-dimethyl-2-butyl)-1,6-diaminohexane, and
(ii) a cycloaliphatic primary diamine,
wherein the relative proportions of N,N′-di-(3,3-dimethyl-2-butyl)-1,6-diaminohexane to cycloaliphatic primary diamine in the chain extender composition are in the range of about 5.7:1 to about 3:1 on a weight basis.
2. A composition as in claim 1 wherein (ii) is a cycloaliphatic primary diamine which has at least one of the following features:
the cycloaliphatic group has a single ring;
at least one of the amino groups is bound directly to a ring.
3. A composition as in claim 2 wherein said cycloaliphatic primary diamine is isophorone diamine.
4. A process for producing a polymer, which process comprises mixing together (A) at least one aliphatic polyisocyanate, (B) at least one polyol and/or at least one polyetheramine, and (C) a chain extender comprised of
(i) N,N′-di-(3,3-dimethyl-2-butyl)-1,6-diaminohexane, and
(ii) a cycloaliphatic primary diamine,
wherein the relative proportions of N,N′-di-(3,3-dimethyl-2-butyl)-1,6-diaminohexane to cycloaliphatic primary diamine in the chain extender composition are in the range of about 5.7:1 to about 3:1 on a weight basis.
5. A process as in claim 4 wherein said polyisocyanate is isophorone diisocyanate.
6. A process as in claim 4 wherein (B) is at least one polyetheramine.
7. A process as in claim 4 wherein said polyisocyanate is isophorone diisocyanate, and wherein (B) is at least one polyetheramine.
8. A process as in claim 4 wherein (ii) is isophorone diamine.
9. A process as in claim 4 wherein (ii) is a cycloaliphatic primary diamine which has at least one of the following features:
the cycloaliphatic group has a single ring;
one of the amino groups is bound directly to a ring.
10. A process as in claim 9 wherein said polyisocyanate is isophorone diisocyanate, and wherein (B) is at least one polyetheramine.
11. A process as in claim 4 wherein a quasiprepolymer is formed during the process.
12. A process as in claim 4 wherein a prepolymer is formed during the process.
13. A polymer formed from ingredients comprising (A) at least one aliphatic polyisocyanate, (B) at least one polyol and/or at least one polyetheramine, and (C) a chain extender comprised of
(i) N,N′-di-(3,3-dimethyl-2-butyl)-1,6-diaminohexane, and
(ii) a cycloaliphatic primary diamine,
wherein the relative proportions of N,N′-di-(3,3-dimethyl-2-butyl)-1,6-diaminohexane to cycloaliphatic primary diamine in the chain extender composition are in the range of about 5.7:1 to about 3:1 on a weight basis.
14. A polymer as in claim 13 wherein said polyisocyanate is isophorone diisocyanate.
15. A polymer as in claim 13 wherein (B) is at least one polyetheramine.
16. A polymer as in claim 13 wherein said polyisocyanate is isophorone diisocyanate, and wherein (B) is at least one polyetheramine.
17. A polymer as in claim 13 wherein (ii) is a cycloaliphatic primary diamine which has at least one of the following features:
the cycloaliphatic group has a single ring;
one of the amino groups is bound directly to a ring.
18. A polymer as in claim 13 wherein (ii) is isophorone diamine.