Process of printing by impact and for marking areas where...

Details Process of printing by impact and for marking areas where... Process of printing by impact and for marking areas where...

C - Chemistry, Metallurgy

09

K

42/10

C09K 3/00 (2006.01) B41M 5/124 (2006.01)

Patent

CA 1166446

ABSTRACT A printing or reproducing or pressure-detect- ing process comprising producing on a substrate a sur- face 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 poly- merized, changes sharply and instantly to blue in those precise areas where struck by a typewriter letter-face.

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