Container for holding high purity isopropyl alcohol
AssigneeTokuyama Corporation
InventorsSeiji Tamura, Hiroyuki Mishima
Life of this patent
Estimating the term…
Abstract
The present invention relates to a container for holding high purity isopropyl alcohol (IPA) used in the electronic industry, which extremely dislike the inclusion of metal impurities. The container made of metal for holding high purity IPA, wherein at least the inside surface layer of the container is composed of nickel.
Claims11
A container made of metal for holding high purity isopropyl alcohol having a purity of not smaller than 99.99% by weight with a water concentration of 50 ppm by weight or below,
- wherein said container has a nickel layer of 0.5 to 50 μm thick having a nickel purity of at least 99% by weight and containing less than 1000 ppm by weight in total of iron, chromium and copper, plated on an inside wall substrate, and on said nickel plated layer, a coating layer of nickel oxide having a thickness of 50 to 400 Å is formed, as an inner-most surface layer, covering over said nickel layer.
A method for holding high purity isopropyl alcohol by packing it in a metal container having a nickel metal layer formed on inner side wall substrate thereof,
- wherein said isopropyl alcohol has a purity at least 99.99% by weight with a water concentration of 50 ppm by weight or below, and said nickel metal layer has a thickness of 0.5 to 50 μm and has a nickel purity of at least 99% by weight with an iron, chromium and copper content of less than 1000 ppm by weight in total, and wherein on said nickel layer, a coating layer of nickel oxide having a thickness of 50 to 400 Å is formed, as an inner-most surface layer, covering over the nickel metal layer.
A container made of metal containing high purity isopropyl alcohol having a purity of not smaller than 99.99% by weight with a water concentration of 50 ppm by weight or below,
- wherein said container has a nickel layer of 0.5 to 50 μm thick having a nickel purity of at least 99% by weight and containing less than 1000 ppm by weight in total of iron, chromium and copper, plated on an inside wall substrate, and on said nickel plated layer, a coating layer of nickel oxide having a thickness of 50 to 400 Å is formed, as an inner-most surface layer, covering of said nickel layer.
Dependencies are inferred from the claim text.