Patent ID: 9459241
Filing Date: 2016-10-04
CPC Classification: C07D,G01N,Y10T

Claim Text:
1. An ink composition comprising: a solvent; an oxygen sensitive dye capable of fluorescing in a manner proportional to oxygen content; and a polymer matrix for the dye, wherein the dye is immobilized in the polymer matrix, wherein the polymer matrix comprises units having pendant sulphonic acid groups or salts or esters of such groups, and wherein, the polymer matrix comprises: (a) a copolymer of an acrylic monomer or oligomer and an ethylenically unsaturated compound containing one or more sulphonic groups; or (b) a reaction product of a polymer containing pendant reactive groups with a sulphonic-group-containing compound of formula (VII) or (VIII): in which: R X R X Z represents a group of formula (II)