Indicator for detection of thermal history
First Claim
Patent Images
1. An indicator for detection of thermal history which comprises:
- (a) at least one azo dye selected from the group consisting of ##STR18## wherein each R1 is a hydrogen or an undissociative substituent selected from the group consisting of halogen atoms, lower alkyl groups, lower alkoxy groups, alkoxy alkyl groups, aromatic groups, nitro group and acylamino group, and Y is a group of the formula ##STR19## wherein R2 has the same definition as R1 ;
(b) at least one epoxy compound selected from the group consisting of polyethylene oxides;
polypropylene oxides;
polybutylene oxides;
polyepichlorohydrins;
styrene oxide;
glycidyl phenyl ether;
diepoxy or triepoxy compounds obtained by the reaction between a polyhydric alcohol and epichlorohydrin;
epoxy compounds of the type of a glycidyl ester of an acid; and
epoxy resins of the glycidyl ester type, bisphenol A type, bisphenol F type, phenolic novolak type and polyalcohol ether type; and
(c) a separating membrane having a melting or softening point of 50°
to 300°
C., composed of a heat-melting or heat-softening material which does not react with said epoxy compound (b), and having a thickness of 0.5 to 200μ
;
said element (a) and said element (b) are adjacent through said separating member (c) thereby providing an indicator for detection of thermal history.
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Abstract
An indicator comprising azo dye(s), epoxy compound(s) and a separating membrane can be utilized for detection of the completion of thermal sterilization treatment in the medical field and also for thermal inspection in such various fields as testing, instrumentation and the like. The indicator can be used also for detection of the completion of alkylene oxide gas sterilization treatment by ethylene oxide gas or the like.
31 Citations
22 Claims
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1. An indicator for detection of thermal history which comprises:
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(a) at least one azo dye selected from the group consisting of ##STR18## wherein each R1 is a hydrogen or an undissociative substituent selected from the group consisting of halogen atoms, lower alkyl groups, lower alkoxy groups, alkoxy alkyl groups, aromatic groups, nitro group and acylamino group, and Y is a group of the formula ##STR19## wherein R2 has the same definition as R1 ;
(b) at least one epoxy compound selected from the group consisting of polyethylene oxides;
polypropylene oxides;
polybutylene oxides;
polyepichlorohydrins;
styrene oxide;
glycidyl phenyl ether;
diepoxy or triepoxy compounds obtained by the reaction between a polyhydric alcohol and epichlorohydrin;
epoxy compounds of the type of a glycidyl ester of an acid; and
epoxy resins of the glycidyl ester type, bisphenol A type, bisphenol F type, phenolic novolak type and polyalcohol ether type; and(c) a separating membrane having a melting or softening point of 50°
to 300°
C., composed of a heat-melting or heat-softening material which does not react with said epoxy compound (b), and having a thickness of 0.5 to 200μ
;said element (a) and said element (b) are adjacent through said separating member (c) thereby providing an indicator for detection of thermal history. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification