Ink composition for sensing carbon dioxide gas, carbon dioxide indicator using the same, package provided with the carbon dioxide indicator, and method for sensing pinhole using the same

Abstract

An ink composition for sensing carbon dioxide gas contains a pH indicator formed using a combination of two or more types of pH indicator components, binder, and solvent and allows easy visual observation of color changes of an indicating portion caused by the concentration of carbon dioxide gas. When the ink composition is applied to a carbon dioxide indicator and package, a pinhole and poor seal of a carbon-dioxide-ambient package are easily found.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 10 / 170,654, filed Jun. 14, 2002, now pending, which is a continuation-in-part application of and claiming the benefit of priority under 35 USC §120 to U.S. patent application Ser. No. 10 / 151,885, filed May 22, 2002, now abandoned, the entire contents of which are incorporated herein by reference. U.S. patent application Ser. No. 10 / 151,885 was a continuing 1110 application, filed under 35 U.S.C. §111(a), of international application PCT / JP00 / 08692, filed Dec. 8, 2000, for which foreign priority benefit was based on Japanese patent application 11-355915, filed Dec. 15, 1999.[0002]This application is based upon and claims the benefit of priority under 35 USC §119 and / or 365 from the prior Japanese patent applications No. 11-355915, filed Dec. 15, 1999; No. 2001-180243, filed Jun. 14, 2001; and No. 2001-180244, filed Jun. 14, 2001, the entire contents of which are incorpo...

AI Technical Summary

Benefits of technology

[0010]The present invention has been made in consideration of the above situation, and has as its first object to provide an ink composition for sensing carbon dioxide gas, which is used to form a carbon dioxide indicating portion capable of easily checking changes in a carbon dioxide atmosphere caused by a pinhole or poor seal of a carbon-dioxide-ambient package.

Problems solved by technology

However, if a pinhole forms or poor seal occurs owing to a defect of the packaging material itself, to a charging failure of the contents, or to a shock during the course of transportation such as distribution, the ambient in the exchange gas packaging would changes, and this may cause the contents to become rotten or change in quality.

As described above, even when gas exchange packaging is performed using a packaging material having superior gas barrier properties, no means can find pinholes and poor seal.

Therefore, it is impossible to check whether the contents are reliably stored in the gas exchange packaging ambient.

However, this carbon dioxide indicator cannot be stable for long time periods.

Unfortunately, the formation of the indicator portion of this monitor is too time-consuming to use the monitor for a packaged product.

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