Method for producing sterilized medical formed article

Patent metadata

Field	Value
Publication number	US-9814792-B2
Application number	US-201414914363-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	Sep 6, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A method is disclosed for producing a sterilized medical formed article that includes applying high-energy rays to a medical formed article at an exposure E. The medical formed article is formed of a resin composition that includes a hydrogenated block copolymer and a phenol-based antioxidant. The hydrogenated block copolymer is obtained by hydrogenating 99% or more of unsaturated bonds of a block copolymer that includes at least two polymer blocks [A] and at least one polymer block [B], the polymer block [A] including a repeating unit derived from an aromatic vinyl compound as a main component, the polymer block [B] including a repeating unit derived from a linear conjugated diene compound as a main component, and a ratio (wA:wB) of a weight fraction wA of the polymer block [A] to a weight fraction wB of the polymer block [B] being 30:70 to 70:30.

First claim

The invention claimed is:

1. A method for producing a sterilized medical formed article comprising applying high-energy rays to a medical formed article at an exposure E, the medical formed article being formed of a resin composition that comprises a hydrogenated block copolymer and a phenol-based antioxidant, the hydrogenated block copolymer being obtained by hydrogenating 99% or more of unsaturated bonds of a block copolymer that comprises at least two polymer blocks [A] and at least one polymer block [B], the polymer block [A] comprising a repeating unit derived from an aromatic vinyl compound as a main component, the polymer block [B] comprising a repeating unit derived from a linear conjugated diene compound as a main component, and a ratio (wA:wB) of a weight fraction wA of the polymer block [A] in the block copolymer to a weight fraction wB of the polymer block [B] in the block copolymer being 30:70 to 70:30, and
the resin composition comprising the phenol-based antioxidant in a ratio of W to 0.50 parts by weight based on 100 parts by weight of the hydrogenated block copolymer, W being calculated by an expression (1),
W =[0.46×(100 −H )+0.04]×( E/ 25)  (1)

where, W is the ratio (parts by weight) of the phenol-based antioxidant based on 100 parts by weight of the hydrogenated block copolymer, H is the hydrogenation rate (%) of the hydrogenated block copolymer, H is a numerical value from 99 to 100, and E is the exposure (kGy) of the high-energy rays.

2. The method for producing a sterilized medical formed article according to claim 1 , wherein the high-energy rays are γ-rays or electron beams.

3. The method for producing a sterilized medical formed article according to claim 1 , wherein the high-energy rays are applied in a state in which the medical formed article is contained in an airtight container that is formed of a resin film.

Assignees

• Zeon Corp

Inventors

• Kohara Teiji
• Ishiguro Atsushi

Classifications

• C08K5/13 Primary

  Phenols; Phenolates · CPC title

• A61L2/087 Primary

  Particle radiation, e.g. electron-beam, alpha or beta radiation · CPC title

• C08L53/025

  modified · CPC title

• A61L2/081

  Gamma radiation · CPC title