| 摘要 |
1449624 Laminates; plywood KURARAY CO Ltd 30 Oct 1973 [2 Nov 1972] 50397/73 Headings B5L and B5N [Also in Division C3] Plywood articles and laminates comprise at least two veneers bonded to each other by an intermediate layer of an adhesive composition comprising (A) a copolymer of at least one α- olefinically unsaturated hydrocarbon and at least 10% by weight of an unsaturated carboxylic acid, a salt of such a copolymer or a copolymer of at least one α-olefinically unsaturated hydrocarbon and at least 10% by weight of an unsaturated compound containing a group convertible to carboxyl by hydrolysis, and having a degree of polymerization of at least 100, (B) a salt of a polyvalent metal in an amount less than 8000% by weight of the copolymer in acidic form and (C) a compound having at least two epoxy groups per molecule, which is incorporated in such an amount that there is less than 1000 mole per cent, based on the carboxyl group of the copolymer of component (A) in acidic form, of epoxy groups in the molecule. In the examples plywood articles are made from red lauan veneers, a zelkova plate, a calcium silicate plate, a pulp cement plate, an asbestos plate and a cherry wood plate. Other components of the adhesive and other materials which can be bonded are listed. The adhesive may be applied by flowing or curtain cooling. |
