High viscosity synthetic ester lubricant base stock

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 105/38 (2006.01) C09K 5/04 (2006.01) C10M 129/74 (2006.01) C10M 171/00 (2006.01)

Patent

CA 2496307

A high viscosity synthetic ester base stock of about ISO 68 to 400 is formed from a neopentylpolyol condensed with at least one monocarboxylic acid selected from the group consisting of linear acids having between 4 to 10 carbon atoms and branched chain acids having from 5 to 10 carbon atoms in an excess of hydroxyl to carboxylic acid groups to form a partial polyneopentyl polyol ester that is further reacted with the same or similar acid to form a high viscosity polyneopentyl polyol ester. Lubricants formed from the base stocks have satisfactory miscibility with standard highly or fully fluorinated refrigeration fluids.

L'invention porte sur une huile de base, contenant un ester synthétique, et dont la viscosité élevée est comprise entre environ 68 à 400 ISO. Cette huile base est obtenue à partir d'un néopentylpolyol condensé avec au moins un acide monocarboxylique sélectionné dans le groupe comprenant des acides linéaires possédant de 4 à 10 atomes de carbone et des acides à chaîne ramifiée possédant de 5 à10 atomes de carbone avec un excès d'hydroxyle dans les groupes acide carboxylique de façon à former un ester polynéopentyl polyol partiel qui est également mis à réagir avec le même acide ou un acide similaire de façon à former un ester polynéopentyl polyol de haute viscosité. Les lubrifiants obtenus à partir des huiles de base présentent une miscibilité satisfaisante avec des fluides de réfrigération standards hautement ou totalement fluorés.

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