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Method of signalling temperature and/or benefit agent release using bar composition comprising thermochromic pigment or dye

  • US 7,829,515 B2
  • Filed: 04/18/2007
  • Issued: 11/09/2010
  • Est. Priority Date: 04/18/2007
  • Status: Active Grant
First Claim
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1. Method of signaling that a defined temperature is obtained and that a benefit agent is released which method comprises(1) preparing a solid bar composition comprising:

  • (a) 5 to 85% by wt. of a surfactant selected from the group consisting of anionic surfactant, nonionic surfactant, amphoteric surfactant, cationic surfactant and mixtures thereof;

    (b) 1 to 50% by wt. bar structurant;

    (c) 0 to 30% by wt. free fatty acid;

    (d) 0.1 to 10% by wt. thermochromatic pigment or dye; and

    (e) 1 to 25% benefit agent;

    wherein the process of preparing said bar comprises combining separate chip compositions comprising;

    (i) 5 to 40% by wt. pigment-containing chip composition comprising;

    (a) 40 to 99.9% by wt. chips comprising polyalkylene glycol soluble structurant material;

    (b) 1 to 40% by wt. chip comprising benefit agent;

    (c) 0.1 to 25% by wt. chip comprising thermochromatic pigment or dye; and

    (d) 0 to 10% by wt. chip comprising compositions water; and

    (ii) 95 to 60% by wt. chip composition comprising surfactant and which comprise substantially no thermochromatic pigment or a pigment of a different color from that in pigment-containing chip;

    wherein (i) and (ii) are combined to form said final solid bar composition in which the pigment is found in the final bar in concentrated regions ranging from 50 μ

    m to 1 cm in its largest direction defined by the chips of (i) and which regions further define the delivery of said benefit agent in chips of (i); and

    (2) indicating a visual cue that said temperature is obtained and the benefit agent is released.

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