EPOXIDIERTES BLOCKCOPOLYMER, VERFAHREN ZU SEINER HERSTELLUNG UND ZUSAMMENSETZUNG DIE ES ENTHÄLT

摘要

The present invention is directed to an epoxidized block copolymer (E) obtained by epoxidizing a block copolymer (C) comprising a polymer block (A) composed mainly of a vinyl aromatic hydrocarbon compound and a polymer block (B) composed mainly of a conjugated diene compound or a product (D) of hydrogenation of the block copolymer (C). The epoxidized block copolymer (E) meets at least one of the following requisites: (1) having a molar ratio (R) of contained hydroxyl to epoxy ranging from 0.001 to 0.1, the molar ratio (R) being represented by the formula: R = ÄhydroxylÜ/ÄepoxyÜ (wherein ÄhydroxylÜ represents the amount, in terms of the number of moles, of hydroxyl contained per unit weight of the epoxidized block copolymer and ÄepoxyÜ represents the amount, in terms of the number of moles, of epoxy contained per unit weight of the epoxidized block copolymer); (2) having a gel content of not greater than 5% by weight; and (3) having a chloride ion content of not greater than 7 ppm. This epoxidized block copolymer can be obtained by epoxidizing the above block copolymer in an organic solvent and evaporating off the organic solvent, and compositions comprising the same together with other compounds and resins are useful.