Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1986-04-08
1987-07-28
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
528 54, 528 94, 528118, 528408, 528417, 540579, C08G 1814
Patent
active
046832491
ABSTRACT:
Amidines of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are alkyl groups and the sum of the carbons in R.sub.1 and R.sub.2 is from 2 to 16 are produced by cyanoethylation of the lactam: ##STR2## wherein R.sub.1 and R.sub.2 are as defined above, followed by reduction and, finally, cyclization by dehydration. The compounds produced are useful for curing epoxy and urethane resins.
REFERENCES:
patent: 3622540 (1971-11-01), Hashimoto et al.
patent: 3769244 (1973-10-01), Hashimoto et al.
Kurosaki Tadamasa
Nakatani Keiichi
Ohnishi Shohzo
San-Apro Kabushiki Kaisha
Welsh Maurice J.
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