Laser markable molding compound, method of use and device theref

Details Laser markable molding compound, method of use and device theref Laser markable molding compound, method of use and device theref

1986-01-27

1987-03-31

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

Microcapsule, process, composition, or product

29574, 295767, 264 22, 264132, 26427217, 42721331, 42721336, 427221, 430945, B05D 306, B01J 1302, H01L 21265, B23K 2600

Patent

active

046542906

ABSTRACT:
An improved laser markable material useful for encapsulation of electronic devices is obtained by adding TiO.sub.2 or TiO.sub.2 +CrO.sub.3 to common plastic encapsulants formed from a mixture of a resin+filler+carbon black+mold release agent. When irradiated by a laser, the originally grey material turns bright gold, providing a high contrast durable mark. The material has excellent marking contrast as well as better stability with time and temperature as compared to prior art laser markable encapsulants. Desirable concentrations, in weight percent of the compound, are 1-5% TiO.sub.2 and 0-3% CrO.sub.3, with 1-3% TiO.sub.2 and 0.5-2% CrO.sub.3 being preferred. Carbon black is optional but a concentration in the range 0.1-3% by weight is desirable with 0.5-1% preferred. Improved encapsulation and marking methods and improved devices using this material are described.

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