Coating composition

  • US 6,133,342 A
  • Filed: 01/21/1999
  • Issued: 10/17/2000
  • Est. Priority Date: 01/21/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A heat responsive colorant particle comprising a colorant, an opaque polymeric material whose opacity changes substantially irreversibly and renders the colorant more visible when exposed to heat, and an adhesion promoter that promotes adhesion between said colorant and said opaque polymeric material.

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