Polymeric colour indicators and a method of their preparation

Details Polymeric colour indicators and a method of their preparation Polymeric colour indicators and a method of their preparation

G - Physics

01

N

402/331, 402/364

G01N 21/80 (2006.01) C08F 8/00 (2006.01) C08F 8/30 (2006.01) G01N 31/22 (2006.01)

Patent

CA 1112797

ABSTRACT OF THE DISCLOSURE: A polymeric colour pH-indicator which is insoluble in the aqueous medium to be controlled and has a certain range of colour change. It comprises the polymerization product of a comonomer selected from the group consisting of esters, amides and N-substituted amides of acrylic and methacrylic acids, with 0.1 to 30 wt.% of a monomer derived from acrylic or methacrylic acid, followed by a coupling reaction with a diazonium salt or a passive coupling component operative to form the colour pH-indicating center.

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