Ceskoslovenska Akademie Ved

Miloslav Kolinsky

Rudolf Lukas

Stanislav Sevcik

Josef Babka

Miroslav Panoch

Vendelin Macho

Miloslav Semler

Juraj Porubsky

Olga Pradova

Vaclava Jisova

Zdenek Mrazek

Bretislav Manek

Vladimir Pacovsky

Stanislav Sykora

Milos Malik

Jaroslav Manas

Vera Paleckova

Jareslava Nohova

Vladislav Kuska

Membrane for barium ion selective electrode The solution pertains to a membrane for barium ion selective electrode formed by the film of suitable polymeric material, for example, high-molecular weight poly(vinyl chloride), with an ion exchanger based on a neutral carrier, namely N,N'-diphenyl-N,N'-di-(2-n-butyloxycarbonylphenyl)diamide of 3,6,9-trioxaundecandioic acid ##STR1##

Membrane for barium ion selective electrode

The invention pertains to capryloyloxyalkyl acrylates of the general formula

Capryloyloxyalkyl acrylates, their polymers and copolymers and the

The invention relates to a method and to a reactor for the single-step polymerization of vinyl monomers by a heterogeneous polymerization in bulk by means of organometalic catalysts. A method according to the invention consists in charging a vertical reactor, which is provided with at least two planetary stirrers situated outside the reactor axis, each stirrer formed from a planar centrally-symmetrical two-blade paddle, with a vinyl monomer, the subsequent introduction of an organometalic catalyst in a solution under stirring and in partial doses amounting to 10.sup.-5 to 10.sup.-3 mole up to the final amount of 5.times.10.sup.-4 to 5.times.10.sup.-2 mole of catalyst per mole of monomer, stirring of the batch, cutting and disintegration of the formed compact mass with the planetary stirrers and its parallel wiping from the surface of reactor with wiping blades until the batch acquires a powdery form and the resulting product is discharged.

Method for the single-step production of vinyl polymers

The invention relates to the method for producing internally plasticized poly(vinyl chloride) suitable for the purposes of earth insulation and medical care. The production method according to the invention consists in the polymerization or copolymerization of vinyl chloride in an aqueous dispersion medium in the presence of up to 50 weight %, related to vinyl chloride, of a polymeric plasticizer prepared by polyesterification of dicarboxylic acids and diols. If desired, the polymerization can be carried out also in the presence of up to 12 weight % of alkyl esters of cyanuric acid and/or the copolymer of ethylene with vinyl acetate as the stabilizers of polymer-chain structure. The polymerization is carried out to the conversion of vinyl chloride 55 to 94% at temperature -20.degree. to +80.degree. C. in the presence of an emulsifier and the resulting polymer is isolated and worked up in the known way.

Method for producing internally plasticized poly(vinyl chloride)

Growing community of inventors

Prague, Czechia

Miloslav Kolinsky