Lubricants for refrigeration systems
OwnerKaoru Matsumura, Elizabeth Dixoninventors
Life of this patent
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Abstract
A lubricating composition which comprises: (A) a polyalkyleneglycol of the general formula (I): RO(RaO)x(RbO)y(RcO)zRd (I) wherein: R is a C4 to C6 substituent comprising a heterocyclic ring, in which the heteroatom(s) in said ring(s) is (are) oxygen and/or sulphur, Ra is a C2 alkylene group, Rb is a C3 alkylene group, Rc is a C4 alkylene group, Rd is the same as R, or is a hydrogen atom or a C1-C20 alkyl or C1-C20 acyl group, x, y, z are each independently 0 or an integer in the range of from 1 to 100, and x+y+z=4 to 100; and (B) an ester of a alcohol containing two or more hydroxyl groups with a mono- or dicarboxylic acid, or an ester of an dicarboxylic acid with an alcohol containing one hydroxyl group.
Claims20
A lubricating composition which comprises:
- (A) a polyalkyleneglycol of the general formula (I):
- RO(RaO),(RbO)y(RcO)zRd (I)
- wherein:
- R is a C4 to C6 substituent comprising a heterocyclic ring, in which the heteroatom(s) in said ring(s) is (are) oxygen and/or sulphur,
- Ra is a C2 alkylene group,
- Rb is a C3 alkylene group,
- Rc is a C4 alkylene group,
- Rd is the same as R, or is a hydrogen atom or a C1-C20 alkyl or C1-C20 acyl group,
- x, y, z are each independently 0 or an integer in the range of from 1 to 100, and
- X+y+z=4 to 100;
- and
- (B) an ester of a alcohol containing two or more hydroxyl groups with a mono- or dicarboxylic acid, or an ester of an dicarboxylic acid with an alcohol containing one hydroxyl group.
A refrigerant composition for refrigeration apparatus which comprises a lubricant composition comprising:
- (A) a polyalkyleneglycol of the general formula (I):
- RO(RaO)x(RbO)y(RcO)zRd (I)
- wherein:
- R is a C4 to C6 substituent comprising a heterocyclic ring, in which the heteroatom(s) in said ring(s) is (are) oxygen and/or sulphur,
- Ra is a C2 alkylene group,
- Rb is a C3 alkylene group,
- Rc is a C4 alkylene group,
- Rd is the same as R, or is a hydrogen atom or a C1-C20 alkyl or C1-C20 acyl group,
- x, y, z are each independently 0 or an integer in the range of from 1 to 100, and
- X+y+z=4 to 100;
- and
- (B) an ester of a alcohol containing two or more hydroxyl groups with a mono- or dicarboxylic acid, or an ester of an dicarboxylic acid with an alcohol containing one hydroxyl group;
- together with a refrigerant.
Refrigeration apparatus which includes a refrigerant composition which comprises:
- (A) a polyalkyleneglycol of the general formula (I):
- RO(RaO)x(RbO)y(RcO)zRd (I)
- wherein:
- R is a C4 to C6 substituent comprising a heterocyclic ring, in which the heteroatom(s) in said ring(s) is (are) oxygen and/or sulphur,
- Ra is a C2 alkylene group,
- Rb is a C3 alkylene group,
- Rc is a C4 alkylene group,
- Rd is the same as R, or is a hydrogen atom or a C1-C20 alkyl or C1-C20 acyl group,
- x, y, z are each independently 0 or an integer in the range of from 1 to 100, and
- X+y+z=4 to 100;
- and
- (B) an ester of a alcohol containing two or more hydroxyl groups with a mono- or dicarboxylic acid, or an ester of an dicarboxylic acid with an alcohol containing one hydroxyl group;
- together with a refrigerant.
Dependencies are inferred from the claim text.