Ceskoslovenska Akademie Ved

Vyskumny Ustav Pre Petrochemiu Prievidza

Vendelin Macho

Miloslav Kolinsky

Rudolf Lukas

Miroslav Zikmund

Stanislav Sykora

Cestmir Hybl

Vladislav Kuska

Juraj Porubsky

Jaroslav Manas

Valer Adam

A process for producing magnesium oxide and/or hydrates thereof from predominantly magnesium or magnesium-calcium raw materials, and optionally producing calcium carbonate, whereby the raw material is roasted if necessary to form a mixture of magnesium oxide and calcium oxide. The calcium oxide is then dissolved from the mixture using an aqueous solution containing an organic amine and a salt of an organic amine with an acid capable of forming a soluble calcium salt with said organic amine. Separating the solution from the undissolved magnesium oxide and treating the solution with carbon dioxide will cause the dissolved calcium to be precipitated and calcium carbide.

Method of making magnesium oxide and hydrates thereof

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)

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Novaky, Czechoslovakia

Vendelin Macho