Laser marking method, laser marking composition and articles hav

Details Laser marking method, laser marking composition and articles hav Laser marking method, laser marking composition and articles hav

1994-07-27

1997-03-04

Lund, Valerie

Recorders

Record receivers and/or driving means therefor

Laminated, impregnated, or coated bases

428532, B41J 2005, C09D 1100

Patent

active

056084293

ABSTRACT:
This invention relates to a laser marking method which comprises coating a laser marking composition containing as essential components a color former, a color developer and an inorganic compound having the absorption peak on the infrared absorption spectrum in the region of 900-1,000 cm.sup.-1 on a substrate to form a color developing layer, and irradiating laser light to the color developing layer; the laser marking composition; and articles having a color developing layer made of the laser marking composition. The method of this invention is capable of forming a mark with vivid color development even when the color developing layer is a thin film of less than 5 .mu.m in thickness or when marking is carried out at high speed.

REFERENCES:
patent: 4510512 (1985-04-01), Okamoto et al.
patent: 4788128 (1988-11-01), Barlow
patent: 5035983 (1991-07-01), Kiyonari et al.
patent: 5413629 (1995-05-01), Yasui et al.
Patent Abstracts of Japan, unexamined applications, M. Section, vol. 17, No. 368, Jul. 12, 1993, JP 05-58031.
Patent Abstracts of Japan, unexamined applications, C section, vol. 17, No. 309, Jun. 14, 1993, JP 05-25317.

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