Opaque polyester containers

Patent metadata

Field	Value
Publication number	US-9382028-B2
Application number	US-50354903-A
Country	US
Kind code	B2
Filing date	Jan 31, 2003
Priority date	Feb 1, 2002
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

The present invention describes both a stretch-blow-molded opaque polyester container and a method of making it. The container, typically a beverage bottle has less than 15% transmission of visible light (500 nm) through a 0.4 millimeter wall thickness. It contains from about 0.1 to about 5 wt. % of said opacifying material. The opacifying material may be any material compatible with polyester resin. The method of making the container includes introducing the opacifying material during polymerization, or prepared as a master batch for mixing with the polymer. Selection of certain opacifying materials can also result in favorable reheat properties, gas permeation-barrier improvements, and when the resin contains both opacifying material and oxygen scavenger there can be a synergistic effect with respect to CO 2 permeation.

First claim

What is claimed is:

1. A stretch-blow-molded opaque polyester container comprising: a polyester resin containing an aluminum powder opacifying material and an oxygen scavenger, wherein said oxygen scavenger comprises an oxidizable polymer and a transition metal catalyst, and wherein the oxidizable polymer is present in an amount of from 4-6 wt % of said polyester resin,
wherein said container has less than 15% transmission of visible light (500 nm) through a 0.4 millimeter thickness.

2. The container of claim 1 , wherein said polyester resin contains from about 0.1 to about 5 wt % of said opacifying material.

3. The container of claim 1 , wherein said oxygen scavenger is partially aromatic polyamide, whereby said container has a carbon dioxide permeation of less than about half that of a container with just said powdered aluminum or of a container with just said partially aromatic polyamide.

4. The container of claim 1 , wherein said polyester resin contains from 0.16 to about 4 wt % of said aluminum powder opacifying material.

5. The container of claim 1 , wherein said aluminum powder opacifying material has a particle size of between 10.2 and 83 microns.

6. The container of claim 1 , wherein said container exhibits a CO 2 permeation that is improved by at least about 15% compared with a container having just polyester resin.

Assignees

• Scantlebury Geoffrey R
• Liu Zhenguo
• Huang Xiaoyan
• Invista North America Sarl

Inventors

• Scantlebury Geoffrey R
• Liu Zhenguo
• Huang Xiaoyan

Classifications

• B29C2949/0715

  the preform having one end closed · CPC title

• B29C49/071

  Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties · CPC title

• B29C49/0005

  characterised by the material · CPC title

• B29K2105/0026

  Flame proofing or flame retarding agents · CPC title

• B29B2911/14033

  Operations & Transport · mapped topic