N,N-disubstituted, .alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.alpha.

Details N,N-disubstituted, .alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.alpha. N,N-disubstituted, .alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.alpha.

1990-04-17

1992-03-17

Morgan, Kriellion S.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

529 99, 529120, 529153, 529359, C08K 53435, C08K 53437, C08K 5526

Patent

active

050969498

ABSTRACT:
N-substituted, N-(polysubstituted-4-piperidinyl)-.alpha.-(3,5-dialkyl-4-hydroxyphenyl)-.a lpha., .alpha.-disubstituted acetamide ("3,5-DHPIPA") generates an exceptionally stable hindered acetamide aroxyl radical which is far more stable than the "blue aroxyl radical" derived from 2,4,6-tri-tert-butyl-phenol, which radical was heretofore adjudged the standard of superior stability and resistance to degradation due to heat, oxygen and light, the compound having been specifically disclosed as a uv-stabilizer. The hindered aroxyl amide radical which is at least ten times more stable than the "blue aroxyl radical" heretofore deemed stable, may be generated by 3,5-DHPIPA compounds prepared by a peculiarly effective synthesis known as the ketoform reaction. This ketoform reaction is unexpectedly well-adapted to produce the 3,5-DHPIPA compounds which we have been unable to produce by any other synthesis known to us. The stability of the hindered aroxyl amide radical inculcates an organic material in which a 3,5-DHPIPA compound is dispersed, with excellent stability. The use of a combination of 3,5-DHPIPA compounds, or a combination of a 3,5-DHPIPA compound with with known stabilizers, particularly the phosphites and benzophenones, in a small but stabilizing amount, provides especially effective stabilization in polyolefins and a host of other synthetic resinous materials.

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