| 摘要 |
1,171,177. Coated sheet materials. ARMSTRONG CORK CO. 16 Dec., 1966 [16 Dec., 1965], No. 56449/66. Heading B2E. [Also in Divisions B6 and C3] An embossed thermoplastic sheet is produced by blending a vinyl resin, a plasticiser for the resin, a blowing agent which decomposes in the range above the glass transition temperature of the plasticised resin and below the decomposition temperature of the resin, an accelerator for reducing the decomposition temperature of the blowing agent, forming the blend into a sheet, applying to the sheet in a predetermined pattern a liquid containing a deactivating agent for the accelerator comprising a tin salt, and heating the resulting sheet to from 300-450‹F to fuse the resin and decompose that blowing agent which has not been in contact with the deactivator. The resin may be polyvinyl chloride, copolymers of vinyl chloride with vinyl acetate, vinylidene chloride, other vinyl esters such as vinyl propionate. vinyl butyrate as well as alkyl, substituted vinyl esters, copolymers of vinyl chloride and acrylic acid, esters thereof and the corresponding methacrylates. Suitable plasticisers are dioctyl and dibutyl phthalate, sebacate and adipate, dioctyl azelate and tricresyl phosphate. An organic solvent for the vinyl resin at elevated temperatures e.g. ketones, aliphatic hydrocarbons, aromatic hydrocarbons and mixtures may be added to the resin and plasticizer to form an organozal. The blowing agent may be azodicarbonamide, azobisisobutyronitrile, N, N'-dimethyl-N, N'-dinitrosoterephthalamide, P, P'-oxybis(benzenesulphonylhydrazide), P, P'- oxybis(benzenesulphonylsemicarbazide), barium azodicarboxylate, dinitrosopentamethylenetetramine. The accelerator may be a lead and/ or zinc salt e.g. lead or zinc 2-ethyl hexanoate or phosphite. Other ingredients e.g. pigments, dyes, granular fillers e.g. clay, limestone or silicate, and heat and light stabilisers may be incorporated in the composition. The composition may be doctored or roll coated onto a strippable carrier e.g. a steel belt, rubber belt, paper or felt, having a release coating or onto a permanent carrier, e.g. a felt, a rubberbonded asbestos, a vinyl sheet or a cellulosic felt. The deactivator may be applied in a carrier liquid e.g. methyl ethyl ketone mixed with dioxane, also ethyl amyl ketone, methyl ethyl ketone, methyl isobutyl ketone cyclohexanone or mixtures. The carrier liquid may be applied as a printing ink to the thermoplastic sheet. The deactivator may be tin formate, tin malleate, tin mercaptides, tin salts of organic fatty acids containing 1-18 carbon atoms, divalent and tetravalent tin chlorides, tin nitrates, sulphates and carbonates and mixed organic-inorganic combinations. A wear covering may be applied over the entire system prior to the final heating step. |
