| 摘要 |
523,231. Coated fabrics. BRITISH CELANESE, Ltd. Dec. 29, 1938, No. 37722. Convention date, Dec. 30, 1937. Drawings to Specification. [Class 140] [Also in IV] Materials such as woven, knitted, or netted fabrics, paper, cardboard, pulp, leather, blocks or sheets of cork, rubber, wood, or asbestos, metal sheets, strips, cloth, or netting, lead pencils, insulated wire, ribbons, mouldings, rods, strips, tubes and corset stays are coated with a composition obtained by kneading a thermoplastic cellulose derivative, a plasticiser, and a non- solvent assisting liquid, firstly at a temperature such that no substantial loss of non-solvent occurs, allowing the mass to stand until a gel is formed, and then kneading the gel at a temperature such that a substantial amount of the non-solvent evaporates while leaving the composition still tacky. The tacky composition is worked on rollers at a temperature above the boiling point of the assisting liquid and is then applied while still tacky to the base material under heat and pressure. The cellulose derivative may be cellulose acetate, benzyl cellulose or other cellulose ester or ether. The assisting liquid may be alcohol, hot water, or a mixture of acetone and water. Plasticisers which may be used include camphor, dimethoxyethyl phthalate, triacetin, triphenyl phosphate, ana ethyl ortho toluene sulphonamide. The composition may contain lead oleate, oils such as the formal of castor oil, blown castor oil, oxidised olive oil, acetylated polymerised castor oil, rapeseed oil, perilla oil, Russian mineral oil, olive oil, dyes, pigments, lakes, fillers, or resins. Foils, films, or sheets of the coating composition may be formed and these may then be applied continuously to the surfaces to be coated. The surfaces may be heated before application of the composition. Subsequently to the coating operation the uncoated portions or underside of the articles may be cooled or chilled. Cellulose ester coatings may be subjected to saponification e.g. with ammonia or caustic soda. Embossing may precede saponification and the saponified product may be treated with a softening agent such as glycerine or diethylene glycol. Examples describe the preparation of cellulose acetate compositions and their application to sateen and cotton drill cloth. The Specification as open to inspection under Sect. 91 comprises also the preparation of coating compositions other than cellulose derivative compositions and is not restricted to a two stage kneading operation. This subjectmatter does not appear dn the Specification as accepted. |
