Patent ID: 6797222
Filing Date: 2004-09-28
Classification: B29C,B29K,C08L,Y10S

Abstract:
A method of slush molding having steps of dosing a powder to a mold heated to a given temperature thus obtaining layer of partially or completely melted powder on the mold, heating the mold to complete melting, cooling the mold with suitable cooling means to form a film, and stripping the film from the mold, said method characterized by:a) said powder dosed to the mold comprising i) 5-95% by weight of an acid copolymer comprising at least 50% by weight of ethylene, 1-35% by weight of an unsaturated carboxylic acid, and 0-49% by weight of a moiety selected from at least one of alkyl acrylate, alkyl methacrylate, vinylether, alkylene, carbon monoxide and sulphur dioxide; ii) 95-5% by weight of a cross-linking copolymer comprising at least 50% by weight of ethylene, 0.5-25% by weight of at least one reactive moiety selected from the group consisting of (i) an unsaturated epoxide of 4-11 carbon atoms, (ii) an unsaturated isocyanate of 2-11 carbon atoms, (iii) an alkoxy or alkyl silane wherein the alkyl group is from 1-12 carbon atoms, (iv) an alkyl halide, and (v) oxazoline, and 0-49% by weight of a moiety selected from at least one of an alkyl acrylate, alkyl methacrylate, vinylether, alkylene, carbon monoxide and sulphur dioxide, where the alkyl and ether groups are of 1-12 carbon atoms; and iii) a cross-linking promoter; wherein said powder is made by blending the components for a time at a temperature below that at which substantial cross-linking occurs; and b) the mold is heated to complete melting at a sufficient temperature and is held for sufficient time to cross-link the melted film in-situ.