| 摘要 |
<p>1,273,684. Embossed coated sheet material. CONGOLEUM INDUSTRIES Inc. 18 March, 1970 [28 March, 1969], No. 13152/70. Heading B2E. [Also in Divisions B6 and C3] A process of producing a resinous layer having a plurality of raised cellular areas on the surface thereon comprises incorporating into a resinous composition either (A) a hydrazine derivative of formula Z-NH-NH-Z' and cyclic analogues thereof, Z"-NH-NH 2 or where Z and Z' are alkyl, cycloalkyl, phenyl, substituted phenyl or radicals where R is hydrogen or alkyl, cycloalkyl, phenyl, substituted phenyl, or a radical where R 1 is hydrogen, or alkyl, cycloalkyl, phenyl, substituted phenyl, amido or substituted amido radicals, or a (R 2 )-SO 2 - radical where R 2 is alkyl, phenyl, substituted phenyl or a radical where R 3 is alkyl, Z" is a radical of formula or (R 2 )-SO 2 and Z"' and Z"" are the radicals alkyl, cycloalkyl phenyl and substituted phenyl, or (8) an oxidising agent for the hydrazine derivative which is capable of penetrating the resinous composition and oxidising the hydrazine derivative, forming the resinous composition into a layer, providing adjacent to portions of the material the other of the oxidising agent or the hydrazine derivative and heating the resulting system to oxidise the hydrazine derivative and decompose the resulting gas-generating oxidation product so as to cause expansion at the sites of decomposition and formation of elevated cellular regions. The backing sheet may form part of the final product of the resulting sheet of a woven or knitted fabric. Suitable resins are butadienestyrene copolymers, polychloroprene, polyvinyl chloride, polyvinyl acetate, and vinyl chloridevinyl acetate copolymers. The fabric may be of cotton, wool, asbestos, glass or synthetic fibres. It may be pre-impregnated before application of the resin composition with vinyl resins such as vinyl chloride and vinyl acetate polymers, particularly copolymers of these, polymers of acrylic and methacrylic acids and esters, polyethylene, polystyrene, butadiene-styrene copolymers, butadiene-acrylonitrile copolymer, polychlorprene, natural rubber, phenolic resins, polyesters, oleoresins, such as cured, dry and semi-drying oils, isocyanates and polyurethanes. Numerous suitable copolymers for the resin layer are specified. The composition may be in the form of a plastisol or an organosol and many suitable plasticisers and stabilisors are specified. Numerous suitable hydrazine derivatives are listed such as hydrazodicarbonamides. The oxidising agent may be a positive halogen oxidising agent, a peroxide compound, a quinone compound, a quinone chloroamide, a dialkyl sulphoxide or an inorganic oxidising agent. The oxidising composition may be pigmented. Accelerators or catalysts may be present in the pigmented layer for which a vinyl polymer may be present as a carrier. A second layer of resinous composition which may be the same or different from the first coating may be applied before or after the foaming step.</p> |
