| 摘要 |
1,169,994. Extruded matte finish acrylic sheet; laminated acrylic sheets. ROHM & HAAS CO. 21 Feb., 1967 [24 March, 1966], No. 8245/67. Headings B5B and B5N. Acrylic sheet or flattened film having a matte finish is made by extruding through an annular orifice in the normal way for blown film, a thermoplastic acrylic polymer having a melt index of 0À1 to 3 and a glass transition temperature (g.t.t.) of 30‹ to 80‹ C. The polymer may be a homopolymer of a C 2 to C 4 alkyl methacrylate or a copolymer of a C 1 to C 4 alkyl methacrylate with a C 1 to C 8 alkyl acrylate. The sheet or film having a matte surface may be laminated to metallic and non-metallic substrates such as other plastics sheet or shaped articles by application of heat and pressure to the sheets placed face to face. The film becomes clear on laminating. In an example, (1) a 64% methyl methacrylate-36% ethylacrylate copolymer of melt index 2 and g.t.t. 46‹ C. is blown at 450‹ F. to give a film with a matte finish on both sides. This film is laminated on both sides with polyvinyl chloride to give a clear laminate with a smooth high gloss surface. |
