COMPOSITION FOR MOLDING, METHOD OF ITS PRODUCTION, METHOD OF MOLDING AND MOLDED ARTICLES Russian patent published in 2000 - IPC

FIELD: compositions for molding, methods of their production and molding. SUBSTANCE: composition for molding includes: (A) high-density ethylene homopolymer, or ethylene copolymer with up to 0.5 mol.% of alpha-olefin of high density produced by suspension, or gas-phase polymerization in presence of Ziegler or Fillips catalyst, or in presence of compound of transition metal having cyclopentadienyl, or containing cyclopentadientyl group; and (B) linear copolymer of ethylene having on the average less than 0.01 long-chain branches per 1000 atoms of carbon, or ethylene copolymer having on the average from 0.01 to 3 long-chain branches per 1000 atoms of carbon distinguishing by the fact that component (A) is used in the form of polymer with density of 0.955 g/cu.cm or above, melt index measured at load of 2.16 kg from 0.3 to 10 g/10 min and polydispersity from 1.8 to 10; and component (B) is used in the form of polymer with density from 0.85 to 0.94 g/cu.cm, melt index measured at load of 2.16 kg from 0.5 to 5 g/10 min. and polydispersity from 1.8 to 5. Composition contains the following ratio of components, mas.%: (A), 60-95; (B), 5-40. In this case, composition density ranges from 0.94 to 0.962 g/cu.cm. Invention also covers description of method of composition production, method of article molding, and molded articles produced by said method. Composition may be molded into articles having improved luster and impact strength with preserved adequate value of rigidly as compared with the known compositions for molding. Compositions are produced by simple and convenient method. EFFECT: higher efficiency. 18 cl, 11 tbl