RADIATION-SENSITIVE BLOCK COPOLYMER, METHOD OF PREPARING THEREOF, RADIATION HARDENABLE COMPOSITIONS (VARIANTS), PRESSURE-SENSITIVE HARDENABLE TAPES AND LABELS Russian patent published in 2000 - IPC

FIELD: chemistry of polymers. SUBSTANCE: described are radiation- sensitive block copolymers of formula: (AB)_p(B)_qX, wherein A is polyvinyl aromatic unit and B is polybutadiene unit, X is residue from polyvalent combination agent, parameter p has average numerical value which is equal to at least 4.5, and parameter q has average numerical value which is equal or more than zero, sum of values p and q being equal to at least 4 wherein block copolymer has average vinyl aromatic content ranging from 7 to 35 % by weight and has total apparent molecular weight ranging from 50,000 to 1,500,000, and in this case, content of vinyl in polybutadiene units ranges from 35 to 70: p/(p+q) ratio is at least 0.375 radiation hardenable sealing, covering or adhesion compositions containing said block copolymers. Also described are method of preparing thereof and pressure-sensitive tapes or labels prepared therefrom. EFFECT: good heat resistance and adhesion properties of the compositions. 22 cl, 9 tbl