Other

Vasily V Polyakov

Valerian Mikhailovich Sobolev

Julian M Chumanov

Vyacheslav F Gubaidulin

Grigory M Shulgin

Sergei P Efimenko

Vladimir P Slednev

Dmitry P Evteev

Veniamin Veniaminovich Fulmakht

Viktor I Pogorzhelsky

Anatoly L Liberman

Ivan P Mitin

Valentin B Shum

Vasily F Kozlov

Boris A Dolgoplosk

Dmitry K Polyakov

Alexandr A Arest-Yakubovich

Vladimir S Glukhovskoi

Valery P Kotov

Raisa V Basova

Jury S Tsybin

Anna R Gantmakher

Valentin P Shatalov

Ervin M Rivin

Anatoly P Garshin

Alexandr G Kharitonov

Vyacheslav G Fil

Vladimir I Listopad

Fedor P Afanasov

Klavdia A Kulakova

Stanislav V Efremov

Anatoly A Tolpa

A method of making billets, whereby a composite billet is produced by continuous casting or rolling, which billet is star-shaped in cross section and has at least two ray members disposed symmetrically relative to the central longitudinal axis of the composite billet; the base of each star ray member of the composite billet at the place of its juncture with the central portion thereof is selected to be 0.72 to 2.3 of the ray member height, the other base being 0.5 to 1.0 of the ray member height, the lateral sides of the ray member may differ in length; the segregation zone is caused to concentrate in the central portion of the composite billet selecting appropriate relationship between geometric dimensions of the composite billet and by creating favorable conditions for producing the composite billet; thereafter, the ray members are severed from the central portion of the composite billet by means of rolls in a rolling mill, this being performed by subjecting one of the lateral sides of the ray member to the action of an appropriately grooved roll.

Method of making billets

A process for producing high-impact polystyrene which comprises polymerization of styrene in the presence of a reinforcing agent, i.e. a conjugated diolefin polymer, random copolymer, graft-copolymer or block-copolymer of a conjugated diolefin with styrene or a mixture of said copolymers and an anionic catalyst based on organic derivatives of alkali metals or adducts thereof in a medium of inert hydrocarbon solvents such as aliphatic, cycloaliphatic and aromatic solvents or mixtures thereof. On completion of polymerization the resulting polymer is subjected to cross-linking by means of peroxide compounds or redox systems, followed by isolation of the desired product. The process for producing high-impact polystyrene according to the present invention makes it possible to shorten the technological cycle due to increased polymerization rate, to facilitate production technology, and to manufacture polystyrene with improved properties.

Process for producing-impact polystyrene

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Voronezh, undefined

Vasily V Polyakov