Abstract: Improved methods of removing coating films from resin substrates includes first treating the resin substrates in an aqueous alkali solution with a concentration of 0.1 wt % or more at a temperature of 110.degree. C. or more, which temperature is lower than the melting point of the substrates and then polishing the surfaces of the substrates by either bringing them into contact with each other in suitable equipment such as a screw feeder, or using an abrasive in suitable equipment such as a high-speed vessel type stirrer, or subjecting the substrates to a liquid honing process.

Abstract: A fire-retardant 1-butene resin composition composed of(A) 100 parts by weight of a 1-butene polymer or copolymer containing 0 to 20 mole % of an olefin with 2 to 20 carbon atoms other than 1-butene as a comonomer,(B) 110 to 1,000 parts by weight of an inorganic hydroxide selected from the group consisting of magnesium hydroxide and aluminum hydroxide, and(C) 10 to 150 parts by weight of a graft-modified olefin resin resulting from grafting of an unsaturated carboxylic acid or its functional derivative to a polymer or a copolymer of an olefin having 3 to 8 carbon atoms or a copolymer of said olefin with up to 30 mole % of ethylene.

Abstract: Disclosed is improvement of heat-stability of a backing sheet for cushioned floor during foaming step of gelled polyvinyl chloride resin. The backing sheet comprises a thermoplatic resin fibrous material, another fibrous material and an inorganic filler, to which a phenolic antioxidation agent or a phosphitic antioxidation agent is added.