Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1999-01-21
2000-10-17
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524495, 524496, 524515, 524577, 524579, C09D 1100
Patent
active
061333425
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.
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"Laser-sensitive Pigmente im Kunststoff", Austropak, pp. 10-12 (1997).
Translation of AF ("Laser-sensitive Pigments im Kunststoff", Austropak, pp. 10-12 (1997).
Adams Jamice C.
Mizobuchi Yoshikazu
Lipman Bernard
Marconi Data Systems Inc.
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