Laser beam absorbing resin composition, coloring material theref

Details Laser beam absorbing resin composition, coloring material theref Laser beam absorbing resin composition, coloring material theref

1994-04-22

1995-06-06

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523137, 523216, 523443, 524430, 524431, 524443, 524444, 524450, 428403, 428404, G21F 110, C08L 6300, C08K 322, C08K 334

Patent

active

054223830

ABSTRACT:
A laser beam absorbing resin composition is disclosed which includes 100 parts by weight of a resin, and 1-100 parts by weight of composite particles having an average particle diameter of 0.1-50 .mu.m and each including a particulate, laser beam absorbing inorganic substance, and a colorant physically bonded directly to the inorganic substance and capable of discoloring upon being heated at a temperature of 250.degree. C. or more, the weight ratio of the colorant to the inorganic substance being in the range of 1:99 to 50:50. By irradiating a shaped, hardened body of the above composition with a laser beam, the colorant is thermally decomposed, so that the color of the irradiated surface is changed and becomes discriminative from that of non-irradiated surface.

REFERENCES:
patent: 5053440 (1991-10-01), Schveler et al.

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