Chelating agents for improved color fidelity
AssigneeThe Procter & Gamble Company
InventorsJohn Robert Rusche, Ellen Schmidt Baker, Axel Masschelein
Life of this patent
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Abstract
Rinsing dyed or white fabrics in a chelator-containing rinse bath restores color and brightness. Rinse added compositions comprising chelators such as diethylenetriaminepentaacetate or ethylenediamine disuccinate are used to restore the appearance of colored and white fabrics whose drab appearance has been caused by interactions with metal ions, especially copper and nickel. Compositions comprising the chelators in combination with fabric care auxiliaries such as fabric softeners, cellulase enzymes and chlorine scavengers are provided.
Claims2
A composition of matter consisting essentially of:
- (a) a biodegradable, ester linked fabric softener selected front the group consisting essentially of compounds having the formula (I) and (II), below:
- ##STR23## wherein Q is --O--C(O)-- or --C(O)--O-- or --O--C(O)--O-- or --NR.sup.4 --C(O)-- or --C(O)--NR.sup.4 --;
- or mixtures thereof;
- R.sup.1 is (CH.sub.2).sub.n -Q-T.sup.2 or T.sup.3 ;
- R.sup.2 is (CH.sub.2).sub.m -Q-T.sup.4 or T.sup.5 or R.sup.3 ;
- R.sup.3 is C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl or H;
- R.sup.4 is H or C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 hydroxyalkyl;
- T.sup.1, T.sup.2, T.sup.3, T.sup.4, T.sup.5 are the same or different C.sub.11 -C.sub.22 alkyl or alkenyl group;
- n and m are integers from 1 to 4;
- and
- X.sup.- is a softener-compatible anion;
- (b) a biodegradable ethylenediamine disuccinate chelating agent;
- (c) water soluble zinc salt;
- and
- (d) a liquid carrier;
- said composition being formulated at a pH of about 3.5 or below.
Dependencies are inferred from the claim text.