Bleach composition containing weakly to non-colored porphine photo-activator
AssigneeLever Brothers Company
InventorStuart W. Beavan
Life of this patent
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Abstract
Bleach compositions comprising a weakly coloring to non-coloring porphine photo-activator and process for bleaching substrates or liquids using said porphine photo-activator are disclosed. The porphine photo-activator used and as defined herein is selected such that the lowest energy allowed electronic transition of the photo-activator molecule gives rise to an absorption band (Q band) with maximum intensity at a wavelength greater than 700 nm.
Claims11
A bleach composition comprising a weakly colouring to non-colouring porphine photo-activator having the general formula:
- ##STR8## wherein X is (.dbd.N--);
- wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is individually an optionally substituted ortho-arylene system forming together with a pyrrole ring in the porphine core a condensed nucleus;
- wherein M is 2(H) atoms bound diagonally opposite nitrogen atoms, or Zn (II), Ca (II), Mg (II), Al (III) or Sn (IV);
- wherein Z is any necessary counter ion for the solubilizing groups;
- wherein n is the number of solubilizing groups;
- wherein substituted into any R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be A, a solubilizing group selected from the group consisting of (a) cationic groups, where Z is an anion and n is from 0 to about 10;
- (b) polyethoxylate nonionic groups --(CH.sub.2 CH.sub.2 O).sub.g H, where Z is zero, n is from 0 to about 10, and G=ng=the number of condensed ethylene oxide molecules per porphine molecule is from 0 to about 70 and (c) anionic groups where Z is a cation and n is from 0 to about 10;
- such that the lowest energy allowed electronic transition of the photo-activator molecule gives rise to an absorption band (Q band) with a maximum intensity;
- at a wavelength greater than 700 nm.
A process for bleaching substrates or liquids comprising contacting said substrates or liquids with a weakly colouring to non-colouring porphine photoactivator of the general formula:
- ##STR9## wherein X is (.dbd.N--);
- wherein each of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is individually an optionally substituted orthoarylene system forming together with a pyrrole ring in the porphine core a condensed nucleus;
- wherein M is 2(H) atoms bound diagonally opposite nitrogen atoms, or Zn (II), Ca (II), Mg (II), Al (III) or Sn (IV);
- wherein Z is any necessary counter ion for the solubilizing groups;
- wherein n is the number of solubilizing groups;
- wherein substituted into any R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be A, a solubilizing group selected from the group consisting of (a) cationic groups, where Z is an anion and n is from 0 to about 10;
- (b) polyethoxylate nonionic groups --(CH.sub.2 CH.sub.2 O)gH, where Z is zero, n is from 0 to about 10, and G=ng=the number of condensed ethylene oxide molecules per porphine molecule is from 0 to about 70 and (c) anionic groups where Z is a cation and n is from 0 to about 10;
- such that the lowest energy allowed electronic transition of the photo-activator molecule gives rise to an absorption band (Q band) with a maximum intensity, at a wavelength greater than 700 nm, is used, said bleaching being carried out in the presence of sunlight, natural or artificial light having radiation wavelength greater than 600 nm.
Dependencies are inferred from the claim text.