Process of printing by impact and for marking areas where impact

Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board

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400127, 427 36, 427 541, 427146, 427369, 4273855, 427391, 428127, B05D 306

Patent

active

043282598

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.

REFERENCES:
patent: 3501302 (1970-03-01), Foltz
patent: 3999946 (1976-12-01), Patel et al.
patent: 4054684 (1977-10-01), Ceintrey et al.
patent: 4215208 (1980-07-01), Yee et al.

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