LINEAR AND BRANCHED BLOCK-COPOLYMERS AND A METHOD OF THEIR SYNTHESIS Russian patent published in 1997 - IPC

FIELD: organic chemistry, polymers. SUBSTANCE: product: epoxydized linear or branched block-copolymers of the formula: [/E1-B1-EPOX1/-HT-A-/E2-B2_ -EPOX2/]n where: A means vinylaromatic block at amount 10-50% of all polymer weight; E - B -EPOX means diene hydrogenated block at epoxy-groups content 1-20 weight %; HT means the binding copolymeric segment consisting of hydrogenated and epoxydized diene fragments and vinylaromatic fragments being content of this copolymeric segment is 20% of total polymer weight, not above; X - coupling agent. Mean molecular mass of these block-copolymers is 30000-200000, content of polyvinylaromatic blocks in their composition is 10-50 wt.-%, content of blocks (E1-B1-EPOX1) + (E2-B2-EPOX2) modulates from 90 to 50 weight % and weight ratio between blocks (E1-B1-EPOX1) and (E2-B2-EPOX2) is 0.1-1.0. These polymers were used for polymeric composition preparing on the basis of industrial polymers (polyamides, polycarbonates, polyesters) and in mixtures with oils and hydrocarbon resins. EFFECT: improved physical properties (impact viscosity), enhanced adhesion to polar substrates. 8 cl, 6 tbl