Process of printing by impact and for marking areas where impact or pressure is applied
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United States of America Patent
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May 4, 1982
Grant Date -
N/A
app pub date -
Oct 27, 1980
filing date -
Oct 27, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A printing or reproducing or pressure-detecting process comprising producing on a substrate a surface consisting essentially of a colored acetylenic composition of partially polymerized monomer which has at least two triple bonds which are conjugated, and having certain substituents in the molecule; preferably 5,7-dodecadiyn-1,12-bis(p-bromophenyl urethane) monomer. When subjected to impact or pressure, these surfaces change color sharply; e.g. an orange surface comprising the above bromophenyl urethane monomer, partially polymerized, changes sharply and instantly to blue in those precise areas where struck by a typewriter letter-face.
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