Self-adhesive material for wood board and wood board

Abstract

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.