Antifoam additives for use in low viscosity applications
AssigneeAfton Chemical Corporation
InventorsDiane Gauthier, Joseph B. Carroll
Life of this patent
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Abstract
A lubricant composition comprising a major amount of a base oil having a kinematic viscosity between 2 and 8 cSt at 100° C. and a minor amount of an additive composition represented by formula IV: wherein x and y can be the same or different and (x+y) equals between 50 and 1,500 and m and n can be the same or different and Q is hydrogen or a monovalent organic group selected from the group consisting of C1-C8 alkyl, acetyl and isocyanato group of the formula —NCO.
Claims26
A lubricant composition comprising:
- a) a major amount of a base oil having a kinematic viscosity between 2 and 8 cSt at 100° C.;
- and
- b) a minor amount of an additive composition represented by formula I:
- wherein x and y can be the same or different and (x+y) equals between 50 and 1,500 and R is a polyoxyalkylene group having a molecular weight of 500-5000 g/mol and is represented by the following formula:
- —(CH2)a—O—(C2H4O)m(C3H6O)n-Q
- Q is hydrogen or a monovalent organic group selected from the group consisting of C1-C8 alkyl, acetyl and isocyanato group of the formula —NCO, subscript a is a positive integer of 2-6, m is a positive integer of 3-6 and n is a positive integer of 20-40.
A lubricant composition comprising:
- a) a major amount of a base oil having a kinematic viscosity between 2 and 8 cSt at 100° C.;
- and
- b) a minor amount of an additive composition represented by formula IV:
- wherein x and y can be the same or different and (x+y) equals between 50 and 1,500 and m and n can be the same or different and m is a positive integer of 3-6 and n is a positive integer of 20-40 and Q is hydrogen or a monovalent organic group selected from the group consisting of C1-C8 alkyl, acetyl and isocyanato group of the formula —NCO.
A method for improving the antifoam properties of a lubricating fluid having a kinematic viscosity of between 2-8 cSt at 100° C., comprising including in a lubricating fluid an effective amount of one or more compounds of formula I
- wherein x and y can be the same or different and (x+y) equals between 50 and 1,500 and R is a polyoxyalkylene group having a molecular weight of 500-5000 g/mol and is represented by the following formula:
- —(CH2)a—O—(C2H4O)m(C3H6O)n-Q
- Q is hydrogen or a monovalent organic group selected from the group consisting of C1-C8 alkyl, acetyl and isocyanato group of the formula —NCO, subscript a is a positive integer of 2-6, m is a positive integer of 3-6 and n is a positive integer of 20-40.
A method for improving the antifoam properties of a lubricating fluid while lubricating an automotive component requiring lubrication, comprising:
- 1) adding a lubricating fluid to an automotive component requiring lubrication, said fluid comprising (a) a base oil having a kinematic viscosity at between 2 and 5 cSt at 100° C., and (b) one or more compounds of formula IV
- wherein x and y can be the same or different and (x+y) equals between 50 and 1,500 and m and n can be the same or different and m is a positive integer of 3-6 and n is a positive integer of 20-40 and Q is hydrogen or a monovalent organic group selected from the group consisting of C1-C8 alkyl, acetyl and isocyanato group of the formula —NCO;
- and
- 2) operating the automotive component that contains the fluid,
- wherein the antifoam performance of the fluid is improved relative to the performance of a lubricating fluid free of the compound of 1) (b).
Dependencies are inferred from the claim text.