Stamicarbon B.v.

Electrochemische Energieconversie, N.v.

Antoon Dorrestijn

Pieter J Lemstra

Lambert H Van Unen

New rigid polyvinyl chloride foam having a density of less than 200 kg/m.sup.3 and having a uniform, fine-celled cell-structure consisting of a rigid vinyl chloride homopolymer containing per 100 parts by weight of polyvinyl chloride 0.1-15 parts by weight of a homo- or copolymer of an alkyl methacrylate having an alkylgroup of 1-10 carbon atoms having a viscosity of the solution .eta..sub.0.1 of between 1.times.10.sup.-6 and 4.times.10.sup.-6 m.sup.2 /s measured at 293 K in 1,2 dichloro ethylene and a method for the preparation of such a new rigid polyvinyl chloride foam.

Rigid polyvinyl chloride foam

New rigid polyvinyl chloride foam having a density of between 10 and 50 kg/m.sup.3 and having a uniform, fine-celled cell-structure consisting of a rigid vinyl chloride homopolymer containing per 100 parts by weight of polyvinyl chloride 0.1-15 parts by weight of a homo- or copolymer of an alkyl methacrylate having an alkyl group of 1-10 carbon atoms and a method for the preparation of such a rigid polyvinyl chloride foam.

Method for the preparation of rigid polyvinyl chloride foams with a density of below 200 kg/m.sup.3, in which method rigid polyvinyl chloride which is provided with a melt-flow improver is foamed with a physical blowing agent via an extruder, in which method in a first step, rigid polyvinyl chloride, together with and preferably mixed with 0.1-15 parts by weight per 100 parts by weight of polyvinyl chloride of a melt-flow improver is fed to an extruder and extruded therewith to form a granulate, this granulate is subsequently impregnated, in a second step, with a physical blowing agent and finally, in a third step, the impregnated granulate is fed, to a foaming extruder in which the granulate is extruded while it passes through a temperature profile in which process the rigid polyvinyl is foamed.

Method for the preparation of rigid polyvinyl chloride foams

The invention relates to a method for the manufacture of an electrochemical cell or battery, consisting of a stack of plate-shaped elements, each of which consists of a sheet or plate of electrode material which is mounted in a frame made of electrically insulating fibrous-web material impregnated with a non-polymerized thermosetting synthetic material, which elements in a first compression molding stage are heated under pressure for a relatively short primary time at a relatively low primary temperature under which conditions the thermosetting synthetic material flows well but polymerizes only to a minor degree, thereafter the elements are combined with other battery components are stacked into an electrochemical cell package which in a second compression molding stage is formed into a coherent block by compression for a relatively long secondary time and at a relatively high secondary temperature to set the thermosetting synthetic material.

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Grevenbicht, Netherlands

Antoon Dorrestijn