Construction Panel Having Improved Fixing Strength

Abstract

A plasterboard comprising a gypsum matrix having wood particles embedded therein in an amount of at least 2 wt % relative to the gypsum, the gypsum matrix further comprising glass fibres in an amount of at least 1 wt % relative to the gypsum.

1 . A plasterboard comprising a gypsum matrix having wood particles embedded therein in an amount of at least 1 wt % relative to the gypsum, a polymeric additive distributed throughout the gypsum matrix in an amount of at least 1 wt % relative to the gypsum;
 wherein   no backing lamina is attached to either face of the plasterboard;   and further wherein the polymeric additive is selected from group consisting of polyvinyl acetate, polyvinyl acetate-ethylene co-polymer, polyvinyl pyrrolidone crosslinked with polystyrene sulfonate, polyvinyl alcohol, methyl cellulose, hydroxyethyl methyl cellulose, styrene-butadiene copolymer latex, acrylic ester latex, acrylic copolymer latex, polyester resin, epoxy resin, polymethyl methacrylate, polyacrylic acid, cationic starch, ethylated starch, dextrin and mixtures thereof;   wherein   the length of the wood particles is in the range 0.5-25 mm and the thickness of the wood particles is less than 4 mm.   
     
     
         2 . A plasterboard according to  claim 1 , wherein the polymeric additive is present in an amount of at least 4 wt % relative to the gypsum. 
     
     
         3 . A plasterboard according to  claim 1 , wherein the particles are present in an amount of at least 2 wt % relative to the gypsum. 
     
     
         4 . A plasterboard according to  claim 1 , wherein the plasterboard further comprises glass fibres. 
     
     
         5 . A plasterboard according to  claim 4 , wherein the glass fibres are present in an amount of at least 1 wt % relative to the gypsum. 
     
     
         6 . A plasterboard according to  claim 1 , wherein the polymeric additive is polyvinyl acetate. 
     
     
         7 . A plasterboard comprising a gypsum matrix having wood particles embedded therein in an amount of at least 2 wt % relative to the gypsum, the gypsum matrix further comprising glass fibres in an amount of at least 1 wt % relative to the gypsum. 
     
     
         8 . A plasterboard according to  claim 7 , wherein the plasterboard includes opposing exterior faces and no backing lamina is attached to either of the opposed exterior faces. 
     
     
         9 . A plasterboard according to  claim 7 , wherein a maximum dimension of the particles is in the range 0.5-25 mm.