Homogeneous dispersions of diorganopolysiloxane compositions in mineral oils
AssigneeRhone-Poulenc Industries
InventorsAndre Guillaume, Ferenc Sagi
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Abstract
Homogeneous and stable dispersions of organosiloxane polymers in mineral oils are provided by mixing at a temperature above 80.degree. C. organosiloxane polymer compositions and mineral oil compositions and solid ethylene/vinyl acetate copolymer. Such dispersions are excellent foam inhibitors for lubricating oil compositions.
Claims7
A storage stable dispersion comprising:
- (A) from about 4 to 40 weight percent of an organosiloxane polymer composition comprising
- (1) from about 80 to 100 weight percent of an organosiloxane polymer of the formula ##STR4## wherein R which can be identical or different is an alkyl group of 1 to 3 atoms and x is a number between 30 to 2,000,
- (2) from about 0 to 20 weight of silica having a specific surface area greater than 50 m.sup.2 /g,
- (B) from about 55 to 95 weight percent of mineral oil,
- (C) from about 1 to 12 weight percent of an ethylene/vinyl acetate copolymer having a vinyl acetate content from about 15 to 40 weight percent and a melt index of from about 2 to 600 grams per 10 minutes.
A process for the prepartion of storage stable dispersions which comprises mixing at a temperature of at least 80.degree. C.
- (a) from about 4 to 40 weight percent of an organosilioxane polymer composition comprising
- (1) from about 80 to 100 weight percent of an organosiloxane polymer of the formula ##STR5## wherein R which can be identical or different is an alkyl group of 1 to 3 atoms and x is a number between 30 to 2,000,
- (2) from about 0 to 20 weight percent of silica having a specific surface area greater than 50 m.sup.2 /g,
- (B) from about 55 to 95 weight percent of mineral oil,
- (C) from about 1 to 12 weight percent of an ethylene/vinyl acetate copolymer having a vinyl acetate content from about 15 to 40 weight percent and a melt index of from about 2 to 600 grams per 10 minutes.
A process of inhibiting foam in mineral oil lubricating compositions having foaming tendencies comprising mixing into said oil a minor amount of the dispersion comprising
- (A) from about 4 to 40 weight percent of an organosiloxane polymer composition comprising
- (1) from about 80 to 100 weight percent of an organosiloxane polymer of the formula ##STR6## wherein R which can be identical or different is an alkyl group of 1 to 3 atoms and x is a number between 30 to 2,000,
- (2) from 0 to 20 weight percent of silica having a specific surface area greater than 50 m.sup.2 /g,
- (B) from about 55 to 95 weight percent of mineral oil,
- (C) from about 1 to 12 weight percent of an ethylene/vinyl acetate copolymer having a vinyl acetate content from about 15 to 40 weight percent and a melt index of from about 2 to 600 grams per 10 minutes
- said minor amount being sufficient to provide from 5 to 30 parts of said organosiloxane polymer (A) per million parts of the total mineral oil composition.
Dependencies are inferred from the claim text.