CPC C08K 5/46 (2013.01) [C08K 5/1345 (2013.01); C08K 5/18 (2013.01); C08K 5/375 (2013.01); C08K 2201/014 (2013.01)] | 24 Claims |
1. A stabilising composition for polymeric materials, comprising:
a. a first derivatised phenolic antioxidant having a molecular weight of at least 390 present in an amount of from 20 to 60% w/w based on the total weight of the stabilising composition;
b. at least one secondary arylamine having the formula I:
![]() wherein:
each R, which may be the same or different, independently denotes an optionally substituted hydrocarbyl group; x and y are each independently from 0 to 5 provided that at least one of x and y is at least 1; and provided that at least one R is an unsubstituted cycloalkyl, straight chain alkyl, or branched chain alkyl hydrocarbyl group having at least 9 carbon atoms, wherein the at least one secondary arylamine is present in an amount of from 35 to 75% w/w of the stabilising composition; and
c. one or more antioxidant boosters selected from the group consisting of:
i. a second derivatised phenolic antioxidant having lower steric hindrance than the first derivatised phenolic antioxidant wherein the second derivatized phenolic antioxidant comprises a bridged bisphenol, a di-hydroxybenzene, and/or a tri-hydroxybenzene wherein, the one or more antioxidant boosters is present in an amount of from 0.25 to 15 w/w of the stabilizing composition.
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