Thermoplastic elastomer based on olefin and process for producing the same

Elastomere thermoplastique a base d'olefine, et procede pour l'obtenir

Abstract

A thermoplastic elastomer based on olefin which can be produced simply by melt-kneading 5 - 60 % by weight of a polyethylene resin (A) together with 40 - 95 % by weight of an ethylene/.alpha. -olefin copolymer (B) with optional subsidiary component(s) before the kneaded mass is molded into a formed product, the said elastomer being capable of recycling for reclamation and exhibiting the following characteristics 1 to 3 , namnely, 1 9 ~ Y - 0.43 X ~ 27 .....(1) in which X denotes the JIS A-hardness value (a dimensionless value) of the thermoplastic elastomer based on olefin determined according to the prescription of JIS K 6301 and Y represents the permanent compressive strain value (expressed by %) of the thermoplastic elastomer based on olefin determined according to the prescription of JIS K 6301 under a condition of 70 °C x 22 hours, 2 a tensile strength in the raqnge from 5 to 30 MPa and 3 a permanent elongation of 18 % or less determined according to the prescription of JIS K 6301,

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