A water-and-oil repellant composition and article

Abstract

A water-and-oil repellant composition which has structural units based on a monomer having an Rf group with 6 or less carbon atoms and has a minimal amount of structural units based on a monomer having an Rf group with 8 or more carbon atoms and which, despite this, can impart water and oil repellency with excellent long-term friction resistance to the surface of an article. Also provided is an article which is reduced in environmental burden and is less apt to frictionally decrease in water and oil repellency. The water-and-oil repellant composition comprises a polymer (A) having units of a monomer (a) and units of a monomer (b) and having no units of a monomer (c), the proportion of fluorine atoms in the polymer (A) being 15-45 mass%, excluding 45 mass%, and a polymer (B) having units of a monomer (a) and having no units of a monomer (c), the proportion of fluorine atoms in the polymer (B) being 45 mass% or higher. Monomer (a): a monomer having an Rf group with 4-6 carbon atoms. Monomer (b): a monomer having C12 or higher alkyl, vinyl chloride, or vinylidene chloride. Monomer (c): a monomer having an Rf group with 8 or more carbon atoms.

Description

technical field The present invention relates to a water- and oil-repellent composition and articles treated with the water- and oil-repellent composition. Background technique As a method of imparting water and oil repellency to the surface of an article (fiber product, etc.), it is known to treat the article with a water and oil repellent composition composed of an emulsion in which the following polymer is dispersed in a medium The method wherein the polymer comprises a structural unit based on a monomer having a polyfluoroalkyl group having 8 or more carbon atoms (hereinafter, the polyfluoroalkyl group is referred to as an Rf group.). However, recently, the EPA (U.S. Environmental Protection Agency) has pointed out the problem that a perfluoroalkyl group having a carbon number of 8 or more (hereinafter, the perfluoroalkyl group is denoted as R F base. ) compounds are decomposed in the environment and in organisms, and the decomposition products accumulate, that is, th...

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Problems solved by technology

However, there is the following problem in the article treated with the water-repellent and oil-repellent composition of (1) and (2): The polymer contained in the water- and oil-repellent composition contains f The structural unit of the monomer of the group, and does not contain the R based on having 8 or more carbon atoms f The structural unit of the monomer of the base, so it is easy to reduce the water and oil repellency due to friction

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