The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2002
Filed:
Sep. 19, 2000
Yoshikazu Mizobuchi, Mundelein, IL (US);
Jamice C. Adams, Richton Park, IL (US);
Marconi Data Systems Inc., Wood Dale, IL (US);
Abstract
The present invention provides a laser markable coating composition comprising a colorant and a polymeric material whose opacity changes substantially irreversibly when exposed to heat. The composition may further include a carrier, an adhesion promoter, an energy transfer agent, an opaque polymeric material, and one or more binder resins. The present invention further provides a heat responsive colorant particle comprising a colorant and a polymeric material whose opacity changes substantially irreversibly when exposed to heat. A laser beam can be used to provide the heat. An example of a suitable polymeric material that irreversibly changes in opacity is a styrene/acrylic microsphere. An example of a suitable colorant is carbon black pigment. An example of an energy transfer agent is fumed silica. An example of an adhesion promoter is an oxidized polyethylene. An example of a suitable carrier is water. The coating composition offers advantages such as the ability to mark substrates at high line speeds and without creating dust or residues. The surface of the marked substrate is smooth.