1-Oxa-3,8-diazaspiro[4.5]decanes

US4408051A · kind A · utility

Assignee

• Sandoz AG · CH

Inventors

• Hans Hinsken · Lörrach, DE
• Wolfgang Mueller
• Hermann Schneider · Schweich, DE

Key dates

• Filing date: Dec 18, 1981
• Grant date: Oct 4, 1983
• Expiry date: Dec 18, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/35
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Compounds obtained by the addition of unsaturated esters to the >NH group of compounds of formula II ##STR1## are useful as light stabilizers for polymeric materials, particularly for thermoplastic polymers and automotive finishes. Preferred compounds are those in which R, R.sub.1 and R.sub.2 are all hydrogen and R.sub.3 and R.sub.4 together with the carbon atom to which they are attached form a cyclododecylidene ring.