Thio-bis(alkyl lactone acid esters) and thio-bis (Hydrocarbyl di

Details Thio-bis(alkyl lactone acid esters) and thio-bis (Hydrocarbyl di Thio-bis(alkyl lactone acid esters) and thio-bis (Hydrocarbyl di

1990-07-18

1992-06-02

Medley, Margaret

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560152, 560 1, 252 486, 252 56D, 44390, C07C38100, C07C 6974

Patent

active

051188350

ABSTRACT:
Thio-bis-(hydrocarbyl substituted diacid materials), such as thio-bis-(polyalkyl lactone acid) and/or their precursors, the adducts of sulfur chloride and unsaturated diacid materials, e.g., 4,8-bis-polyalkyl-4,8-dichloro-6-thiaundecane-1,2,10,11-tetracarboxylic acid bis-anhydride and their dehydrochlorinated analogs, when esterified with an alcohol, preferably a polyol, such as pentaerythritol, polypentaerythritol or a polyalkylene glycol with or without acid catalysts and/or metal template reagents yield thio-bis-(alkyl lactone acid esters) and thio-bis-(hydrocarbyl diacid esters) which can be characterized in part, as macrocyclic and/or macrocyclic-like structures, are useful as stable additives in lubricating compositions, e.g. as varnish inhibiting dispersants for lubricating oils and fuels.

REFERENCES:
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patent: 4239636 (1980-12-01), Brois et al.
patent: 4417062 (1983-11-01), Brois et al.
patent: 4568756 (1986-02-01), Brois et al.
patent: 4866187 (1989-09-01), Brois et al.
patent: 4965375 (1990-10-01), Brois et al.

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