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US 10,900,001 B2Granted
Occult particles for use in granular laundry care compositions
AssigneeMilliken & Company
InventorsGregory E. Fernandes, Raj Vachhani
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Abstract
This invention relates to non-bleeding, non-staining occult particles for use in granular or powdered laundry care compositions such as laundry detergents, laundry aids, and fabric care compositions. The occult particles are comprised of a clay carrier and a coloring agent and are characterized as being substantially indiscernible when contained in the laundry care composition.
Claims11
An occult particle comprising:
- a) a majority by weight of at least one clay carrier material, and
- b) at least one color premix material, wherein the color premix material is comprised of:
- (i) At least one polymeric colorant cut with a solvent or mixture of solvents or solvent system such that the cut polymeric colorant contains less than 25 wt % of a tertiary aromatic amine,
- (ii) At least one diluent having R>1, wherein the at least one diluent is selected from glycerol, propylene carbonate, ethylene glycol and mixtures thereof, and
- wherein the at least one carrier material and the at least one color premix material form a carrier-color premix composite;
- and
- wherein the carrier-color premix composite is substantially indiscernible in a non-colored granular or powdered laundry care composition.
4 more elements
A process for producing occult particles comprising the following steps:
- (a) Add at least one solvent to at least one pure, uncut coloring agent;
- (b) Mix the at least one solvent with the pure coloring agent to provide a cut color that contains <25 wt % of a tertiary aromatic amine solvent;
- (c) Add at least one diluent for which R>1 to the cut color, wherein the at least one diluent is selected from glycerol, propylene carbonate, ethylene glycol, and mixtures thereof;
- (d) Mix the at least one diluent and the cut color;
- (e) Add the mixture from step “d” to at least one carrier material;
- (f) Mix the mixture from “d” and the at least one carrier material to form a carrier-cut color composite;
- and
- (g) Perform a particle size-based separation step and a re-grinding step to achieve optimal size distribution for occult effect and bleed stability.
5 more elements
Dependencies are inferred from the claim text.