Anti yellowing composition

Patent metadata

Field	Value
Publication number	US-9822251-B2
Application number	US-201214343130-A
Country	US
Kind code	B2
Filing date	Aug 28, 2012
Priority date	Sep 8, 2011
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

The present invention relates to a radical scavenging and anti-yellowing composition for polymeric materials and compositions containing the same. The invention further relates to medical devices comprising a composition according to the invention and to a method of sterilizing such devices.

First claim

The invention claimed is:

1. A method of sterilizing a medical device, comprising:
exposing the medical device to about 2.5 GGy or more of gamma radiation, wherein the medical device comprises a composition, the composition comprising about 99% bisphenol A-derived polycarbonate, about 1% polypropylene glycol, and about 0.13% dioctadecyl 3,3′-thiodipropionate.

2. The method of claim 1 , wherein the exposing step is carried out in an oxygen-free atmosphere.

3. A composition comprising about 99% bisphenol A-derived polycarbonate, about 1% polypropylene glycol, and about 0.13% dioctadecyl 3,3′-thiodipropionate.

Assignees

• Elbert Bernhard
• Jahnke Eike
• Trinseo Europe Gmbh

Inventors

• Elbert Bernhard
• Jahnke Eike

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08L2203/02

  for biomedical use · CPC title

• C08L2201/08

  Stabilised against heat, light or radiation or oxydation · CPC title

• A61L31/14

  Materials characterised by their function or physical properties {, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials} · CPC title

• A61L2/08

  Radiation · CPC title