| 摘要 |
1,146,432. Laminates and laminating. DUNLOP CO. Ltd. 17 June, 1966 [20 July, 1965], No. 30730/65. Heading B5N. [Also in Divisions B2 and C3] A fibrous web of sheet material such as paper or a textile fibre, which may be in the form of a woven fabric or a non-woven fabric may be impregnated with a material comprising the reaction product of (a) a polymer of one or more episulphides having at least two reactive terminal groups and (b) a potentially thermosetting aminoplast by spraying, brushing, spreading and especially dipping techniques and composite laminate structures may subsequently be formed and if desired a layer of a non-fibrous material such as a strip of aluminium or other heat-resistant material may be included to confer heat-resistant properties on the impregnated fibrous material. The fibrous layers may be united together before the impregnating material is applied or they may be non-united layers which are united by the impregnating material itself giving a flexible composite fabric. Layers of fibrous web may be mechanically locked together, for example, by needling, or they may be impregnated and laminated together by means of conventional laminating resins, for example, aminoplastics or phenolin resins and the top web is then impregnated with the impregnating material giving a laminate, which is not usually flexible, having a working surface very resistant to alkali and to chipping. Drying of the impregnated fibrous web is effected at room temperature or at 70-80‹ C. and curing may be effected at 140-200‹ C. while the coated web is compressed between press platens. The examples describe the formation of laminates whereby both surfaces of a decorative paper web are coated with the impregnating material and also both surfaces of a white overlay paper web are similarly coated and the two coated webs air-dried, superimposed and pressed together for 10 minutes at 180‹ C. between chromium plates previously coated with a silicone release agent. The resulting sheet materials may be provided with a backing of adhesive, which may be covered with a release paper. The cured surfaces are resistant to staining by household liquids and cleaners. Uses:-Covering materials for kitchen shelves, walls and tables. |
