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Abstract

A method of coating a surface with a polymer layer, which method comprises exposing said surface to a plasma comprising a monomeric unsaturated organic compound which comprises a chain of carbon atoms, which are optionally substituted by halogen; provided that where the compound is a perhalogenated alkene, it has a chain of at least 5 carbon atoms; so as to form an oil or water repellent coating on said substrate. Suitable compounds for use in the methods are compounds of formula (I) where R¹, R² and R³ are independently selected from hydrogen, alkyl, haloalkyl or aryl optionally substituted by halo; provided that at least one of R¹, R² or R³ is hydrogen, and R⁴ is a group X—R⁵ where R⁵ is an alkyl or haloalkyl group and X is a bond; a group of formula —C(O)O(CH₂)_nY— where n is an integer of from 1 to 10 and Y is a bond or a sulphonamide group; or a group —(O)_pR⁶(O)_q(CH₂)_t— where R⁶ is aryl optionally substituted by halo, p is 0 or 1, q is 0 or 1 and t is 0 or an integer of from 1 to 10, provided that where q is 1, t is other than 0. The method is particularly useful in the production of oil- and/or water repellent fabrics.

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First Claim