High purity polymeric water-soluble colorants and their...

Details High purity polymeric water-soluble colorants and their... High purity polymeric water-soluble colorants and their...

C - Chemistry, Metallurgy

08

F

402/1, 402/5, 18

C08F 6/04 (2006.01) A23L 1/275 (2006.01) C09B 67/54 (2006.01) C09B 69/10 (2006.01)

Patent

CA 1107888

Abstract of the Disclosure Polymeric water-soluble colorants, characterized by containing not more than 1% of nonwater impurities having molecular weights below about 1000 are disclosod as is their achievement by a purification process comprising ultrafiltration of a crude aqueous solution of said colorants followed by spray-drying of the retentate resulting from said ultrafiltration.

287477

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