Process for producing thermoplastic elastomer composition

摘要

Disclosed is a process for producing a thermoplastic elastomer composition having a matrix phase comprising a polyamide and an ethylene/vinyl alcohol copolymer and a disperse phase comprising a rubber composition, by which gelation by a reaction between a polyamide and an ethylene/vinyl alcohol copolymer can be inhibited and the dispersion of the rubber composition can be good. In the process, the polyamide resin and the rubber composition are melt-blended to the extent necessary for the rubber composition to form a disperse phase, and then the ethylene/vinyl alcohol copolymer is added and further melt-blended together.

主权项

1. A process for producing a thermoplastic elastomer composition having a matrix phase comprising a polyamide resin and an ethylene/vinyl alcohol copolymer and a disperse phase comprising a rubber composition, wherein, using a twin screw kneader having at least two supply ports, the polyamide resin and the rubber composition are supplied to an upstream supply port of the twin screw kneader, and the polyamide resin and the rubber composition are melt-blended to prepare a blend of the polyamide resin and the rubber composition having a sea-island structure, in which the polyamide resin constitutes a matrix phase and the rubber composition constitutes disperse phases, and, by supplying the ethylene/vinyl alcohol copolymer to a downstream supply port of the twin kneader, the ethylene/vinyl alcohol copolymer is added to the blend and melt-blended to prepare a thermoplastic elastomer composition having sea-island structure, in which the polyamide resin and the ethylene/vinyl alcohol copolymer constitute a matrix phase, and the rubber composition constitutes a disperse phase.