HYDROGENATED BLOCK COPOLYMERS AND ENGINEERING THERMOPLASTIC RESINS

A process for the preparation of a composition containing a block copolymer, partially hydrogenated, characterized in that: (a) 4 to 40 parts by weight of a partially hydrogenated block copolymer comprising at least two terminal polymer blocks a of a monialkenyl - medium molecular weight sand between 5,000 and 125,000, and at least one intermediate polymer block b of a conjugated diene of average molecular weight between 10,000 and 300,000, in which the terminal polymer blocks a constitute between 8 and 55% by weight weight of the block copolymer and not more than 25% of the double bonds of arene of the polymer blocks a and at least 80% of the aliphatic double bonds of the polymer blocks b have been reduced by hydrogenation, are mixed at a temperature of treatment comprised between 150ºC and 400ºC with (b) a crystalline acetal resin having a melting point above 120º c, and with c) 5 to 48 parts by weight of at least one thermoplastic engineering resin selected from the group consisting of polyamides, polyolefins, thermoplastic polyesters, thermoplastic polyurethanes, polycarbonates, halogenated thermoplastics, poly (aryl ethers), aromatic polysulfones, and nitrile resins, the ratio being by weight of the acetal resin relative to the thermoplastic resin for engineering other than greater than 1: 1, thereby forming a polyblend wherein at least two of the polymers form, at least in part, one with another continuous crosslinked network. (Machine-translation by Google Translate, not legally binding)