SELF-ADHESIVE MATERIAL FOR WOOD BOARD AND WOOD BOARD
The invention relates to a self-adhesive material for a wood board. In accordance with the invention, the self-adhesive material is formed of polyolefin film having a melt index is ≦4 g/10 min (measured 190° C./2.16 kg), and the polyolefin film contains reactive groups with —OH groups of the wood for forming self-adhesive properties. Further, the invention relates to a wood board in which the self-adhesive material is used as a coating and/or as a glue-line material.
1 .- 20 . (canceled)
21 . A self-adhesive material for a wood board, wherein the self-adhesive material is formed of polyolefin film having a melt index is ≦4 g/10 min (measured 190° C./2.16 kg), the polyolefin film contains reactive groups with —OH groups of the wood for forming self-adhesive properties, and the reactive groups of the polyolefin film is activated during the manufacturing of the self-adhesive material for forming a covalent bond with —OH groups of the wood.
22 . The self-adhesive material according to claim 21 , wherein the polyolefin film is at least partially cross-linked.
23 . The self-adhesive material according to claim 21 , wherein the reactive groups of the polyolefin film is activated at temperatures of more than 180° C. during the manufacturing of the self-adhesive material.
24 . The self-adhesive material according to claim 21 , wherein a catalyst is used in the manufacturing of the self-adhesive material.
25 . The self-adhesive material according to claim 21 , wherein the polyolefin film comprises at least two layers which are the first ( 1 ) and second layer ( 2 ), and at least the first layer ( 1 ) is a self-adhesive layer so that it contains reactive groups with —OH groups of the wood.
26 . The self-adhesive material according to claim 25 , wherein the second layer ( 2 ) is at least partially cross-linked.
27 . The self-adhesive material according to claim 25 , wherein the first layer ( 1 ) is at least partially cross-linked.
28 . The self-adhesive material according to claim 25 , wherein the second layer ( 2 ) contains reactive groups with —OH groups of the wood.
29 . The self-adhesive material according to claim 25 , wherein at least one additive layer ( 3 ) is arranged between the first ( 1 ) and second ( 2 ) layers.
30 . The self-adhesive material according to claim 21 , wherein polyolefin is selected from group: polyethylene, polypropylene and their combinations.
31 . The self-adhesive material according to claim 21 , wherein the polyolefin film contains maleated polyolefin which contains maleic anhydride reactive groups.
32 . The self-adhesive material according to claim 21 , wherein the polyolefin film contains iso-cyanate grafted polyolefin which contains reactive groups.
33 . The self-adhesive material according to claim 21 , wherein the polyolefin film or layer of the film is grafted with alkoxysilane containing reactive functional groups with the polyolefin.
34 . The self-adhesive material according to claim 21 , wherein the maleated polyolefin contains maleic acid 0.3-15% by weight of the maleated polyolefin.
35 . The self-adhesive material according to claim 21 , wherein the polyolefin film is cross-linked by a method selected from group: silane moisture method, electron beam (EB) radiation, vinyl-silane hydrolysis and their combinations.
36 . The self-adhesive according to claim 25 , wherein the layer of the polyolefin film contains polyethylene, polypropylene, maleic anhydride polyethylene or maleic anhydride polypropylene or their combinations.
37 . A wood board, which wood board is formed so that the veneers of the wood board are joined together, wherein the wood board is manufactured by the self-adhesive material according to claim 21 so that the self-adhesive material is used as a coating onto board and/or as a glue-line material between veneers.
38 . The wood board according to claim 37 , wherein the coating is attached onto the wood board by covalent bonds between the coating and the —OH groups of the wood board.
39 . The wood board according to claim 37 , wherein the glue-line material is attached between the veneers of the wood board for gluing the veneers together and the glue-line material forms covalent bonds between the glue-line material and the —OH-groups of the veneers.
40 . The wood board according to claim 37 , wherein the self-adhesive material is attached onto the veneers of the wood board by hot pressing at temperatures of 120-170° C.
41 . The wood board according to claim 37 , wherein the wood board is selected from group: plywood, particle board, fiber board and paper board.
42 . The method for manufacturing a self-adhesive material, wherein the self-adhesive material is formed of polyolefin film having a melt index is ≦4 g/10 min (measured 190° C./2.16 kg) and containing reactive groups with —OH groups for forming self-adhesive properties, and the reactive groups of the polyolefin film is activated during the manufacturing of the self-adhesive material for forming a covalent bond with —OH groups.
43 . The method according to claim 42 , wherein a catalyst is used in the manufacturing of the self-adhesive material.