E.i. Dupont De Nemours and Company

Basf Se Corporation

Constantine D Papaspyrides

Ioannis V Bletsos

Rudolf Pfaendner

Daniel Gregory Tynan

Pantelis K Kiliaris

The invention relates to flame retardant compositions that contain mixtures of melamine polyphosphates with layered silicates added to the polymer substrates, particularly polyamides.

Layered silicate flame retardant compositions

A mixing apparatus suitable for mixing and conveying solid, particulate, polymeric materials, comprising a barrel that can be heated and cooled, at least two co-rotatable, self-wiping extruder screws located within the bore of the barrel, the screws being connected through a laterally flexible coupling to a drive means which can reverse the direction of rotation of the screws upon the occurrence of a predetermined event. The apparatus also comprises a closeable feed port and a closeable discharge port, both of which can be made gas-tight, the shafts of the screws being provided with seals capable of withstanding elevated gas pressures inside the barrel.

Polymer mixing apparatus and method

The invention provides a process for directly manufacturing a diamine/dicarboxylic acid salt with a low water content. The process includes reacting a diamine with a dicarboxylic acid to form a diamine/dicarboxylic acid salt. The reaction of the diamine and the dicarboxylic acid is carried out in the presence of about 0.5% to about 25% by weight water, based on the weight of the reaction mixture, while providing conditions in the reaction mixture such that the reaction mixture is in substantially solid particulate form.

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Athens, Greece

Constantine D Papaspyrides