Surface-treating agent for vulcanized rubber
AssigneeNok Corporation
InventorsNatsumi Kimura, Katsumi Abe
Life of this patent
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Abstract
A surface-treating agent for vulcanized rubber, comprising, based on 100 parts by weight, as solid matters, of isocyanate group-containing 1,2-polybutadiene, an organic solvent solution containing 10 to 160 parts by weight of fluororesin particles and 2.5 to 20 parts by weight of a perfluoroalkyl group-containing oligomer-based, fluorine-containing surfactant as a dispersant. The surface-treating agent for vulcanized rubber improves the solution stability of the organic solvent solution, improves the further hardness of the entire coating film formed from the surface-treating agent, abrasion resistance, and product torque evaluation, and is effectively used as, for example, a coating agent for seal lip parts of oil seals.
Claims7
A surface-treating agent for vulcanized rubber wherein the surface-treating agent comprises, based on 100 parts by weight, as solid matters, of isocyanate group-containing 1,2-polybutadiene, an organic solvent solution containing 10 to 160 parts by weight of fluororesin particles and 2.5 to 20 parts by weight of a perfluoroalkyl group-containing oligomer-based, fluorine-containing surfactant as a dispersant, and further comprises, based on 100 parts by weight, as solid matters, of the isocyanate group-containing 1,2-polybutadiene, 100 parts by weight or less, as solid matters, of a composition solution of an OH group-containing fluororesin composition having the following formulation:
- [I] a copolymer of
- (A) a perfluoroalkylalkyl (meth)acrylate and
- (B) a hydroxyl group-containing (meth)acrylate,
- [II] a polymer of an acrylic acid alkyl ester,
- [III] a polymer of a fluorinated olefin, and
- [IV] a curing agent;
- and/or
- 60 parts by weight or less of silicone oil having a viscosity of 8,000 cs or more.
Dependencies are inferred from the claim text.