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Method-of-manufacturing-a-water-and-oil-repelling-film-having-surface-irregularities

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Method of manufacturing a water- and oil-repelling film having surface irregularities

Details

Inventors: Ogawa, Kazufumi; Soga, Mamoru;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Lusignan; Michael
Assistant Examiner:
Attorney, Agent or Firm: Fish & Richardson

A water- and oil-repelling adsorbing film formed on a material having active hydrogen such as hydroxyl group, imino group and amino group at the surface. This film is a chemically adsorbed film having surface irregularities exceeding 10 nanometers. It is directly or indirectly covalently bonded to the material surface and includes a monomolecular film or a polymer film with the molecules thereof containing a fluorocarbon group and a --Si-- bond. The surface irregularities which exceed the molecular level are at least either those formed on the material surface itself, those due to particles formed on the substrate surface or those due to particles present in the chemically adsorbed film.

DETAILED DESCRIPTION An objective of the invention is to provide a water- and oil-repelling adsorbing film formed on a substrate surface, the adsorbing film being a chemically adsorbed film having surface irregularities exceeding 10 nanometers, the chemically adsorbed film being bonded by covalent bonds to the substrate surface either directly or indirectly, and the chemically adsorbed film being a monomolecular or polymer film with the molecules thereof containing a fluorocarbon group and a siloxane group.
It is preferable in this invention that the surface irregularities are from irregularities formed on the substrate surface itself, irregularities due to fine particles formed on the substrate surface or irregularities due to fine particles present in the chemically adsorbed film.
It is preferable in this invention that the particles formed on the substrate surface and fine particles in the chemically adsorbed film are hydrophilic particles.
It is preferable in this invention that the hydrophilic particles and the polymer with the molecule thereof containing a fluorocarbon group and a siloxane group are bonded to one another by covalent bonds.
It is preferable in this invention that the surface irregular chemically adsorbed film is bonded by covalent bonds of --SiO-- or --SiN.
dbd.
to the substrate surface.
It is preferable in this invention that comprises a thin layer of polysiloxane or a thin layer of chemically adsorbed monomolecular layer of siloxane formed on the substrate surface and a surface irregular film formed on the thin layer or the chemically adsorbed monomolecular layer.
It is preferable in this invention that the substrate surface is provided with irregularities formed by particles and/or a coated layer incorporating silicate glass and having surface irregularities and a thin layer or a chemically adsorbed monomolecular layer with the molecules thereof containing a fluorocarbon group and a siloxane group, the surface irregular layer and the thin layer or chemically adsorbed monomolecular layer being bonded to each other by siloxane bonds

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