Process for preventing the gelation of concentrated aqueous phot

Details Process for preventing the gelation of concentrated aqueous phot Process for preventing the gelation of concentrated aqueous phot

1984-03-19

1985-11-12

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

8103, 8137, 25230116, 25230121, 26024582, 26024586, C09B 4720, C11D 339, D06L 312, C08J 522

Patent

active

045525625

ABSTRACT:
The invention relates to a process for preventing the gelation of concentrated aqueous photoactivator solutions containing sulfonated zinc or aluminium phthalocyanines. The process comprises passing a crude solution containing these compounds, when preparing the solutions, through a semipermeable asymmetrical membrane having a pore diameter of 1 to 500 .ANG.. This membrane consists of a basic structure of cellulose acetate, polyacrylonitrile or a copolymer of acrylonitrile and other ethylenically unsaturated monomers. This basic structure is modified in specific manner with ionic groups. The concentrated photoactivator solutions so obtained have excellent storage stability, do not gel, and contain exceedingly small amounts of inorganic and organic impurities.

REFERENCES:
patent: 3927967 (1975-12-01), Speakman
patent: 4033718 (1977-07-01), Holcombe et al.
patent: 4166718 (1979-09-01), Reinert et al.
patent: 4247401 (1981-01-01), Bloch et al.
patent: 4390342 (1983-06-01), Bruttel et al.
patent: 4394125 (1983-07-01), Holzle et al.
patent: 4405329 (1983-09-01), Abel et al.
patent: 4456452 (1984-06-01), Holzle et al.
patent: 4466900 (1984-08-01), Horlacher et al.
Chemical Abstract, vol. 95, (1981), 117056.

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