Resin composition and resin molded article

Patent metadata

Field	Value
Publication number	US-2018030260-A1
Application number	US-201615552894-A
Country	US
Kind code	A1
Filing date	Mar 3, 2016
Priority date	Mar 6, 2015
Publication date	Feb 1, 2018
Grant date	—

Abstract

The present invention is a resin composition comprising a cycloolefin resin and at least two hydrogenated styrene-based thermoplastic elastomers, wherein a content of the cycloolefin resin is 50 to 90 wt % based on a total amount of the cycloolefin resin and the hydrogenated styrene-based thermoplastic elastomers, and a melt volume rate of the resin composition at 260° C. is higher than that of the cycloolefin resin at 260° C., and a resin formed article. One aspect of the invention provides a resin composition that exhibits excellent transparency, impact resistance and melt fluidity, as well as a resin formed article obtained by forming this resin composition. The resin formed article of the present invention is preferably used as a drug container, a medical instrument or the like, since it exhibits excellent transparency and impact resistance.

First claim

1 . A resin composition comprising a cycloolefin resin and at least two hydrogenated styrene-based thermoplastic elastomers,
wherein a content of the cycloolefin resin is 50 to 90 wt % based on a total amount of the cycloolefin resin and the hydrogenated styrene-based thermoplastic elastomers, and a melt volume rate of the resin composition at 260° C. is higher than that of the cycloolefin resin at 260° C.

2 . The resin composition according to claim 1 , wherein both weight average molecular weights of the hydrogenated styrene-based thermoplastic elastomers are 40,000 or less.

3 . The resin composition according to claim 1 , wherein a difference (ΔnD) between a refractive index of the cycloolefin resin (nD1) and an average refractive index of the hydrogenated styrene-based thermoplastic elastomers (nD2) is more than −0.002 to less than +0.002.

4 . A resin formed article obtained by forming the resin composition according to claim 1 .

Assignees

• Zeon Corp

Inventors

• Sawaguchi Taichi
• Yabuki Nozomi

Classifications

• C08G2261/3324

  derived from norbornene · CPC title

• C08L65/00

  Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C08L7/00 - C08L57/00, C08L61/00 take precedence); Compositions of derivatives of such polymers · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L45/00 Primary

  Compositions of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Compositions of derivatives of such polymers (of cyclic anhydrides or imides C08L35/00; of cyclic esters of polyfunctional acids C08L31/00) · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title