ISOBUTYLENE-BASE ELASTOMERIC MIXTURES Russian patent published in 2005 - IPC

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to isobutylene-base polymeric composition, namely to mixtures of semicrystalline ethylene copolymers with brominated butyl rubber. Semicrystalline ethylene copolymers represent a statistic copolymer prepared from ethylene monomers, one or some other monomers taken among the order comprising alpha-olefins comprising from 4 to 10 carbon atoms and optionally one or some dienes. Semicrystalline ethylene copolymer comprises ethylene links in the amount, at least, 45 wt.-% as measured for mass of this semicrystalline copolymer. Polymeric composition is prepared by mixing isobutylene-base polymer and semicrystalline ethylene polymer and the polymeric composition can comprise additionally amorphous polymer, oil, low-molecular polybutenes, antioxidants, stabilizing agents, filling agents, pigments and carbon black. Prepared polymeric mass shows the stress value from 0.1 to 1 MPa at elongation of sample by 100% at 50°C, air penetrability of vulcanized mixture is less 8 x 10^-8 cm³ x cm/cm² x s x atm at 65°C.

EFFECT: improved properties of mixtures.

4 cl, 5 tbl