Heat and light stabilisers for polymer(s) - such as polyamide(s), PVC, polyolefin(s), etc. comprise bis-amide(s) of squaric acid

摘要

Polymers are stabilised by incorporating bis-amides of quadric acid of formula (I) or (II) (where R1-4 each (A) H or opt. substd. 1-22C alk(en)yl =1 of which may be replaced by heteroatoms; (B) opt. substd cycloalkyl(alkenyl) (C) opt. subst std. ary(alkyl); (D) opt. substd. 3-8 ring contg. hetero atom(s) and opt. bound to the N atoms in (I) or (II) by alkylene or (E) -NR1-R2 and/or -NR3R4 which may be opt. substd. 3-8 rings opt. substd. by other heteroatoms. or (F) R1 and R2 or R3 and R4 may be (un)branched, (un)satd. cyclic condensed aliphatic chains. The stabilisers are added at 0.01-5 wt.% to homo-and copolymers of (di)olefins, vinyl acetate, etheresters, urethanes, isocyanurates or acrylonitrile; homopolymers, copolymers and graft copolymers of styrene and its homologues or of vinyl chloride; (co)polyamides; polyesteramide and polyetheresteramides. The stabilisers gibe simultaneous protection against degradation by heat, UV light, oxygen and hydrolysing liquids such as (in)organic acids and alkalis, and are esp. useful for incorporation into articles designed for extended periods of outdoor exposure.