US 6,582,787 B1Granted

Container for photoresist liquid

AssigneeAicello Chemical Co., Ltd.

InventorsKeiji Kawai, Yoshiaki Ito

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Abstract

A blow molded container for high purity liquid chemicals having (1) an inner layer formed of a high purity resin comprising at least one member including olefinic polymers of ethylene, propylene, butene-1, 4-methyl-pentene-1, hexene-1 or octene-1 and copolymers of ethylene and olefins other than ethylene; (2) an intermediate layer of a solvent-barrier resin including polyamides, polyvinyl alcohols, poly(ethylene-co-vinyl alcohols), polyesters and polyphenylene oxides; and (3) an external layer formed of a light-shielding substance-containing resin composition. The lowest absorbance of the total layers of the container is greater than 2.0 measured at a wavelength of not more than 400 nm. The total layers also have an absorbance that does not exceed 1.62 measured at a wavelength of 600 nm. The container is especially good for holding photoresist liquids.

Claims5

Dependent claims

A blow molded container for photoresist liquid, the container having light-shielding properties in the ultraviolet light region while permitting some transmission of light rays in the visible light region, comprising an inner layer, an intermediate layer, and an external layer, wherein

(1) the inner layer is a resin comprising at least one olefinic polymer selected from polymers of ethylene, propylene, butene-1, 4-methyl-pentene-1, hexene-1 or octene-1 and copolymers of ethylene and olefins other than ethylene;
(2) the intermediate layer is a solvent-barrier resin comprising at least one member selected from the group consisting of polyamides, polyvinyl alcohol, copolymers of ethylene and vinyl alcohol, polyesters and polyphenylene oxides;
(3) the external layer is a resin composition containing a light-shielding substance;
(4) the lowest absorbance of the container is more than 2.0 determined at a wavelength of not more than 400 nm by spectrophotometer;
and
(5) the absorbance of the container is not more than 1.62 determined at a wavelength of 600 nm by spectrophotometer.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/412,501Filed 5 Oct 1999
Granted: 24 Jun 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification29 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B29C 49/04
Combined blow-moulding and manufacture of the preform or the parison: extrusion blow-moulding
B29C 49/22
Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor: using multilayered preforms or parisons
B32B 1/00
Layered products having a non-planar shape