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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 R.sup.1, R.sup.2 and R.sup.3 are independently selected from hydrogen, alkyl, haloalkyl or aryl optionally substituted by halo; provided that at least one of R.sup.1, R.sup.2 or R.sup.3 is hydrogen, and R.sup.4 is a group X--R.sup.5 where R.sup.5 is an alkyl or haloalkyl group and X is a bond; a group of formula --C(O)O(CH.sub.2).sub.n Y-- where n is an integer of from 1 to 10 and Y is a bond or a sulphonamide group; or a group --(O).sub.p R.sup.6 (O).sub.q (CH.sub.2).sub.t -- where R.sup.6 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