Rubber blend, useful for inner liner of vehicle tyres, comprises halo butyl rubber; additional rubber of e.g. butyl rubber or polybutadiene; delaminated talc; and carbon black

摘要

Rubber blend (A) for inner liner of vehicle tyres, comprises at least one halo butyl rubber (40-100) parts per weight (phr); at least one additional rubber (60 phr) of e.g. butyl rubber or polybutadiene; at least one delaminated talc (5-70 phr) with a BET-surface area of 10-40 m 2/g; and at least one carbon black (10-100 phr) with a cetyltrimethyl ammoniumbromide (CTAB) surface area of 10-25 m 2/g. Rubber blend (A), preferably for inner liner of vehicle tyres, comprises at least one halo butyl rubber (40-100) parts per weight (phr); at least one additional rubber (up to 60 phr) of butyl rubber, polybutadiene, styrene-butadiene copolymer, 3,4 polyisoprene, cis-1,4 polyisoprene, natural rubber, styrene-isoprene copolymer or styrene-isoprene-butadiene terpolymer; at least one delaminated talc (5-70 phr) with a BET-surface area of 10-40 m 2/g, according to DIN 66131, an average particle size (D 50) of 4-8 mu m (determined by means of a laser diffraction measurement) and a layer index (lamellarity index) of 3-15; and at least one carbon black (10-100 phr) with a cetyltrimethyl ammoniumbromide (CTAB) surface area of 10-25 m 2/g, according to ASTM D 3765 and a dibutylpthlate (DBP) number of 50-160 ml/100g, according to ASTM D 2414. An independent claim is included for a vehicle pneumatic tire with an inner liner based on (A).