Radiation imagery chemistry: process – composition – or product th – Microcapsule – process – composition – or product
Patent
1986-11-04
1988-06-28
Shah, Mukund J.
Radiation imagery chemistry: process, composition, or product th
Microcapsule, process, composition, or product
264 22, 264132, 26427217, 427 531, 42721331, 42721336, 427221, 430945, 524430, 524495, 524496, 524497, B05D 306, B01J 1302, H01L 21265, B23K 2600
Patent
active
047538635
ABSTRACT:
An improved laser markable material useful for encapsulation of electroic 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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Handy Robert M.
Motorola Inc.
Shah Mukund J.
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