MULTIBLOCK HYDROGENATED POLYMERS FOR ADHESIVES Russian patent published in 2000 - IPC

FIELD: chemistry of polymers. SUBSTANCE: described is adhesive composition comprising (a) multiblock copolymer of formula: D-A-(B-A)_n-D_x and/or (D-A-B)_q-Y wherein A is vinyl aromatic hydrocarbon polymeric unit molecular weight of which ranges from 4000 to 35000: B is hydrogenated conjugated diene polymeric unit molecular weight of which ranges from 20,000 to 200,000: D is hydrogenated conjugated diene polymeric unit molecular weight of which ranges from 500 to 50,000; n is integer of 1 to 5; x is 0 or 1; g is from 2 to 30; y is multiunit combination agent, and ratio between molecular weight D and molecular weight B varies so that index of normalized molecular weight is within 0 to 180×10^-6 wherein index of normalized molecular weight is defined by formula (MW_D/MW_B) weight: fraction S_X total MW_X weight for polymer in composition wherein MW_D and MW_B are molecular weights of units D and B, respectively: weight fraction S is weight fraction of vinyl aromatic hydrocarbon in polymer; and weight fraction of polymer in composition is weight fraction of polymer used in adhesive composition; content of vinyl aromatic units in copolymer ranges from 9 to 35 wt %: in this case when either B or D is butadiene prior to hydrogenation, content of vinyl units ranges from 30 to 65 wt % and (b) stickiness increasing resin. EFFECT: increased stickiness and higher resistance to peeling, heating and oxidation. 13 cl, 8 tbl