Process for producing mouldings from cork particles
AssigneeWacker Chemie AG
InventorMarcus Pfaadt
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Abstract
The use of water redispersible thermoplastic polymer powder stabilized with protective colloid as a binder in cork products produced from cork flour or granules allows use of reduced amounts of binder without compromising physical properties.
Claims10
A process for the production of moldings of polymer-bonded cork particles, comprising binding the cork particles with a thermoplastic polymer binder in the form of a water-redispersible polymer powder comprising one or more thermoplastic polymers of one or more monomers selected from the group consisting of vinyl esters, (meth)acrylic esters of unbranched or branched alcohols having from 1 to 15 carbon atoms, vinylaromatics, olefins, 1,3-dienes, and vinyl halides, and, optionally, from 0.1 to 5% by weight, based on the total weight of the monomer mixture, of auxiliary monomers;
- one or more protective colloids selected from the group consisting of partially hydrolyzed and fully hydrolyzed polyvinyl alcohols, polyvinylpyrrolidones, polyvinyl acetals, starches, celluloses and their derivatives, proteins, lignosulfonates, poly(meth)acrylamide, polyvinylsulfonic acids and their water-soluble copolymers, melamine-formaldehydesulfonates, and naphthalene-formaldehydesulfonates;
- and, optionally, antiblocking agent(s).
Dependencies are inferred from the claim text.