US 12,168,726 B2
Antioxidant compositions
Clément Barrière, Whitefield (GB); and Maurice Power, Manchester (GB)
Assigned to SI Group, Inc.
Appl. No. 17/297,822
Filed by SI GROUP USA (USAA), LLC, Danbury, CT (US)
PCT Filed Nov. 27, 2019, PCT No. PCT/EP2019/082789
§ 371(c)(1), (2) Date May 27, 2021,
PCT Pub. No. WO2020/109410, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 1819574 (GB), filed on Nov. 30, 2018.
Prior Publication US 2022/0025155 A1, Jan. 27, 2022
Int. Cl. C08K 5/46 (2006.01); C08K 5/134 (2006.01); C08K 5/18 (2006.01); C08K 5/375 (2006.01)
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:

OG Complex Work Unit Chemistry
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.