Compositions – Nonreactive analytical – testing – or indicating compositions
Patent
1977-10-14
1979-09-04
Padgett, Benjamin R.
Compositions
Nonreactive analytical, testing, or indicating compositions
23230R, 526303, 526320, 526329, 5263297, 525376, G01N 2108, C08J 900, C08F 830
Patent
active
041668049
ABSTRACT:
Polymeric color pH indicators are prepared which are insoluble in the measured aqueous medium and show a certain range of color change. These polymeric indicators are the product of copolymerization of a hydrophilic comonomer, selected from esters, amides and N-substituted amides of acrylic and methacrylic acid, with 0.1- 30 wt.% of a comonomer. The comonomer forms the pH-indicating color center by a subsequent coupling with a suitable diazonium salt or a passive component. Vinylic monomers comprising an aromatic system in the molecule are suitable as the functional comonomers. The indicators are prepared by radical copolymerization of the comonomers either in a suspension or in a solution, followed by the subsequent coupling with a diazonium compound, or diazotizing and coupling with a passive component, to obtain the pH-indicating sites of polymer. The product is in the form of small spherical macroporous particles suitable for pH indication in flow-through column processes, in small volumes, or on a microscope stage, or in the form of a solution applicable as a paint and indicating the pH of vessels, reactors, etc. coated therewith, or useful for application to inert carriers.
REFERENCES:
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patent: 3544484 (1970-12-01), Roth
patent: 3904373 (1975-09-01), Harper
patent: 3925267 (1975-12-01), Coupek et al.
patent: 4029598 (1977-06-01), Neisius et al.
Bleha Miroslav
Kalal Jaroslav
Plichta Zdenek
Votavova Eva
Ceskoslovenska akademie ved
Gron T. S.
Padgett Benjamin R.
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