Analytical element
First Claim
1. An analytical element for use in qualitatively and quantitatively analyzing the presence of a component in an aqueous fluid comprising:
- (a) a light-transmissive support;
(b) a reagent layer comprising at least one layer positioned on one side of said support, said reagent layer comprising;
(1) at least one reagent reactive with said component to be analyzed;
(2) a hydrophilic colloid; and
(3) a substantially water-dispersible copolymer obtained by the copolymerization of at least one copolymerizable monomer, said at least one copolymerizable monomer being water-soluble and having a non-ionizable group in the side chain thereof, and being represented by formula (I);
##STR6## wherein R1 and R2 may be the same or different, and each represent a hydrogen atom or a methyl group;
R3 is a hydrogen atom or a mono-valent organic residue;
X is an oxygen atom or a di-valent organic group represented by the formula ##STR7## where R4 is a hydrogen atom, an alkyl group or a group represented by the formula;
--CHCH2 O)m R3, where m is an integer of 2 to 100;
and n is an integer of 2 to 100, with at least one copolymerizable hydrophobic monomer; and
(c) a porous spreading layer comprising at least one layer positioned on said reagent layer on the side opposite to that of said support.
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Accused Products
Abstract
An analytical element for use in analysis of a component in an aqueous fluid, comprising
(a) a light-transmissive support;
(b) a reagent layer; and
(c) a porous spreading layer,
being characterized in that the reagent layer contains a substantially water-dispersible copolymer obtained by copolymerization of at least one copolymerizable monomer, which is water soluble and has a nonionizable group in the side chain, with at least one copolymerizable hydrophobic monomer.
The analytical element of this invention is good with less formation of fogging, higher in color forming density and indicating higher sensitivity.
39 Citations
13 Claims
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1. An analytical element for use in qualitatively and quantitatively analyzing the presence of a component in an aqueous fluid comprising:
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(a) a light-transmissive support; (b) a reagent layer comprising at least one layer positioned on one side of said support, said reagent layer comprising; (1) at least one reagent reactive with said component to be analyzed; (2) a hydrophilic colloid; and (3) a substantially water-dispersible copolymer obtained by the copolymerization of at least one copolymerizable monomer, said at least one copolymerizable monomer being water-soluble and having a non-ionizable group in the side chain thereof, and being represented by formula (I);
##STR6## wherein R1 and R2 may be the same or different, and each represent a hydrogen atom or a methyl group;
R3 is a hydrogen atom or a mono-valent organic residue;
X is an oxygen atom or a di-valent organic group represented by the formula ##STR7## where R4 is a hydrogen atom, an alkyl group or a group represented by the formula;
--CHCH2 O)m R3, where m is an integer of 2 to 100;and n is an integer of 2 to 100, with at least one copolymerizable hydrophobic monomer; and (c) a porous spreading layer comprising at least one layer positioned on said reagent layer on the side opposite to that of said support. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification