HIGH-MOLECULAR POLYPROPYLENE WITH BROAD MOLECULAR-MASS DISTRIBUTION AND SMALL LENGTH OF ISOTACTIC SEQUENCES Russian patent published in 2006 - IPC C08F10/06 

FIELD: chemistry of polymers, organic chemistry.

SUBSTANCE: invention relates to propylene polymers comprising 0-2.5 wt.-% of olefin co-monomers with from 2 to 10 carbon atoms, average-mass molecular mass M_w from 600000 to 800000 g/mole, the ratio M/M_n from 5 to 7, mass part of polymeric fraction with the intrinsic viscosity value from 600 to 900 ml/g from 40% to 60% of all polymer and polymeric fraction with the intrinsic viscosity value from 200 to 250 ml/g from 40% to 60% of all polymer, with the mean length of isotactic sequences from 75 to 80. These polymers are prepared by the polymerization reaction of monomers in the presence of catalytic system comprising metallocene as a transient metal-base component. Polymers can be processed easily to the molded articles being to tubes first of all that show low fragility, smooth surface, high viscosity, good hardness in combination with good index of durability for the molded articles.

EFFECT: improved and valuable properties of polymers.

2 cl, 12 ex