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Hand held photochromic marking implement

  • US 8,128,300 B2
  • Filed: 06/16/2010
  • Issued: 03/06/2012
  • Est. Priority Date: 12/20/2005
  • Status: Expired due to Fees
First Claim
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1. A method of forming a solid hand held direct marking crayon implement comprising:

  • forming a flowable solid phase carrier material comprising (a) at least about 20% by weight, based on the weight of the carrier material, of at least one low polarity wax, (b) a dye solubility agent and (c) a photochromic colorant comprising at least one of 1′

    3′

    -Dihydro-1′

    ,3′

    ,3′

    -trimethyl-6-nitrospiro[2H-1-benzopyran-2,2′

    -(2H)-indole], 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′

    -[3H]naphtha[2,1-b][1,4]oxazine, and mixtures thereof;

    cooling and shaping said solid phase flowable carrier material; and

    forming a solid hand-held direct marking implement which is soft enough to write a colored carrier material directly onto a selected media, at ambient temperature, said marking implement comprising a handle portion for gripping said marking implement and a marking portion comprising said solid phase carrier material.

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