Patent ID: 7994240
Filing Date: 2011-08-09
Classification: C08L

Abstract:
1. A process for the production of mouldings from a mixture of particulate natural materials and thermoplastic binder without added starch, comprising shaping the mixture into a moulding under an elevated temperature of 60° C. to 200° C. and/or a pressure of 10 bar to 600 bar absolute, wherein the thermoplastic binder comprises a water redispersible polymer powder composition containing a) at least one polymer derived from one or more monomers of vinyl esters, (meth)acrylates of unbranched or branched alcohols having 1 to 15 C atoms, vinylaromatics, olefins, 1,3-dienes, and vinyl halides, and optionally 0.1 to 5% by weight based on the total weight of monomer mixture, of auxiliary monomers, b) one or more protective colloids selected from the group consisting of partly hydrolysed or completely hydrolysed polyvinyl alcohols, polyvinylpyrrolidones, polyvinyl acetals, celluloses and derivatives thereof, proteins, lignin sulphonates, poly(meth)acrylamide, polyvinylsulphonic acids and the water-soluble copolymers thereof, melamine formaldehyde sulphonates, and naphthalene formaldehyde sulphonates as protective colloid(s), and c) 1 to 30% by weight of antiblocking agent, based on the weight of polymer.