Liquid phenolic sulphur-containing antioxidants

Details Liquid phenolic sulphur-containing antioxidants Liquid phenolic sulphur-containing antioxidants

2006-04-11

2006-04-11

Truong, Duc (Department: 1711)

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

Synthetic resins

From carboxylic acid or derivative thereof

C528S361000, C528S364000, C528S373000, C524S292000, C524S386000, C560S060000, C252S404000

Reexamination Certificate

active

07026438

ABSTRACT:
The invention relates to liquid sulphur-containing antioxidants and to compositions comprising them. The novel lubricant compositions comprise the reaction product of a selected group of 5-tert-butyl-4-hydroxy-3-methyl(or tert-butyl)phenyl substituted carboxylic acid esters with thiodiethylene glycol and a mono-hydroxy alcohol with a carbon chain length higher than 4 C-atoms. The novel lubricant compositions are highly resistant to oxidative degradation and are capable of reducing the negative effects of deposits, such as black sludge, in motor combustion engines, particularly spark ignition internal combustion engines.

REFERENCES:
patent: 4694099 (1987-09-01), Ahlfors et al.
patent: 5478875 (1995-12-01), Dubs et al.
patent: 5892097 (1999-04-01), Ross et al.
Evans et al, Liquid antioxidants as stabilizers, 1995, Chem Abstract 122: 265035.

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