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US 11,162,045 B2Granted
Grease composition and sliding member coated therewith
AssigneeDow Corning Toray Co., Ltd.
InventorHiroshi Ito
Life of this patent
Estimating the term…
Abstract
Grease composition contains (A) a straight-chain perfluoropolyether having a kinematic viscosity of 2-110 mm2/s at 40° C., (B) a branched perfluoropolyether having a kinematic viscosity of 2-100 mm2/s at 40° C., and (C) a fluorocarbon resin powder having a primary particle size of 1 μm or less, wherein the contained amount of the fluorocarbon resin powder is 25-40 wt % with respect to the weight of the grease composition, and the weight ratio of the straight-chain perfluoropolyether (A) to the branched perfluoropolyether (B) is 15:85 to 70:30.
Claims20
A grease composition comprising:
- (A) a perfluoropolyether that has a kinematic viscosity of 2-110 mm2/sec at 40° C. and that is represented by general formula (1)
- RfO(CF2CF2O)m(CF2O)nRf (1)
- where Rf is a C1-4 perfluoro lower alkyl group, m and n are each an integer ≥0, the sum of m and n is 30-190, and the CF2CF2O and CF2O groups are randomly bonded in the main chain;
- (B) a perfluoropolyether that has a kinematic viscosity of 2-100 mm2/sec at 40° C. and that is represented by general formula (2)
- RfO(CF(CF3)CF2O)p(CF2O)rRf (2)
- where Rf is a C1-4 perfluoro lower alkyl group, p is a positive number, r is a number ≥0, the sum of p and r is 5-50, and the CF(CF3)CF2O and CF2O groups are randomly bonded in the main chain;
- and
- (C) a fluororesin powder having a primary particle size ≤1 μm,
- wherein the fluororesin powder content is 25-40 wt % based on the weight of the grease composition, and the perfluoropolyether (A) to perfluoropolyether (B) weight ratio is 15:85 to 70:30.
6 more elements
A grease composition comprising:
- (A) a perfluoropolyether that has a kinematic viscosity of 2-110 mm2/sec at 40° C. and that is represented by general formula (1)
- RfO(CF2CF2O)m(CF2O)nRf (1)
- where Rf is a C1-4 perfluoro lower alkyl group, m and n are each an integer ≥0, the sum of m and n is 30-190, and the CF2CF2O and CF2O groups are randomly bonded in the main chain;
- (B) a perfluoropolyether that has a kinematic viscosity of 2-100 mm2/sec at 40° C. and that is represented by general formula (2)
- RfO(CF(CF3)CF2O)p(CF2O)rRf (2)
- where Rf is a C1-4 perfluoro lower alkyl group, p is a positive number, r is a number ≥0, the sum of p and r is 5-50, and the CF(CF3)CF2O and CF2O groups are randomly bonded in the main chain;
- and
- (C) a fluororesin powder having a primary particle size ≤1 μm,
- wherein the fluororesin powder content is 25-40 wt % based on the weight of the grease composition, and the perfluoropolyether (A) to perfluoropolyether (B) weight ratio is 15:85 to 70:30, and
- furthermore comprising (D) polyethylene and/or polypropylene particles having a viscosity-average molecular weight of 500,000-7,000,000.
7 more elements
A grease composition comprising:
- (A) a perfluoropolyether that has a kinematic viscosity of 85 mm2/sec at 40° C. that is present in an amount of from 14-27 wt % based on a total weight of the grease composition and that is represented by general formula (1)
- RfO(CF2CF2O)m(CF2O)nRf (1)
- where Rf is a C1-4 perfluoro lower alkyl group, m and n are each an integer ≥0, the sum of m and n is 30-190, and the CF2CF2O and CF2O groups are randomly bonded in the main chain;
- (B) a perfluoropolyether that has a kinematic viscosity of 56-80 mm2/sec at 40° C. that is present in an amount of from 40-56 wt % based on a total weight of the grease composition and that is represented by general formula (2)
- RfO(CF(CF3)CF2O)p(CF2O)rRf (2)
- where Rf is a C1-4 perfluoro lower alkyl group, p is a positive number, r is a number ≥0, the sum of p and r is 5-50, and the CF(CF3)CF2O and CF2O groups are randomly bonded in the main chain;
- and
- (C) a fluororesin powder having a primary particle size of 0.1-0.4 μm and present in an amount of 30-35 wt % based on the weight of the grease composition.
5 more elements
Dependencies are inferred from the claim text.