Microencapsulated photochromic material, process for its preparation and a water-base ink composition prepared therefrom
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United States of America Patent
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May 21, 1991
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N/A
app pub date -
Jul 27, 1989
filing date -
Dec 2, 1987
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Expired
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Abstract
This invention relates to a microencapsulated photochromic material and a process for its preparation. More particularly, it relates to a microencapsulated photochromic material having a good durability and a process for its preparation. The present invention further relates to a water-base ink composition comprising said microencapsulated photochromic material.
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