Dsm N.v.

Other

Reinoldus J Borggreve

Cornelis Eme Koning

Richerdes J Hulskotte

Guido P Beusen

Ellen M De Brabander-Van De Berg

Henricus J Goertz

The invention relates to a plastic sheeting which is suitable, in particular, for application in the construction industry. It is obtained by employing thermoplastic elastomers and has good humidity-regulating properties and water impermeability. Flame retardancy in accordance with DIN 4102 B2 is obtained by employing melamine, melamine compounds or melamine condensates in the thermoplastic elastomer composition for the sheeting.

Halogen free flame retardant sheeting

The invention relates to a process for the preparation of star-branched polymers by reaction in the melt of a polymer having at least one hetero atom in the chain with a compound having at least three functional groups. Suitable polymers are for instance polyamides, polyesters, polyurethanes, polyoxyalkyls, polyimines and copolymers of these. Functional groups are for instance amine, carboxyl, hydroxyl, isocyanate and imine groups. The process is very fast and requires no special purification. The process enables star-branched polymers to be prepared which are derived from so-called AABB polycondensates.

Preparation of star-branched polymers

The invention relates to a thermoplastic polymer composition comprising a polyphenylene oxide; a graft copolymer (A), comprising a copolymer of a vinyl-aromatic compound, a vinyl cyanide and optionally a third monomer and a rubber, whereby the rubber is grafted on the backbone to the copolymer; and a graft copolymer (B) having polystyrene chains grafted on a copolymer backbone which contains units of a vinyl-aromatic compound and units of an .alpha.,.beta.-unsaturated dicarboxylic anhydride. The presence of graft copolymer (B) in the polymer composition causes a significant improvement of the notched impact resistance.

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Hulsberg, Netherlands

Reinoldus J Borggreve