US Patent No. 10,362,971

FINGERPRINT POWDER


Patent No. 10,362,971
Issue Date July 30, 2019
Title Fingerprint Powder
Inventorship Paul Chambre, Fort Myers, FL (US)
Assignee AIR SCIENCE USA LLC, Fort Myers, FL (US)

Claim of US Patent No. 10,362,971

1. A powdered polycyanoacrylate polymer produced by a process comprising:(a) charging a reaction vessel with a mist comprising water;
(b) dripping methyl or ethyl 2-cyanoacrylate into the water mist in the reaction vessel, thereby producing an exothermic reaction, thereby conducting uniform polymerization of said methyl or ethyl 2-cyanoacrate, and temporarily halting or decreasing a rate of addition of methyl or ethyl 2-cyanoacrylate if the temperature in the reaction vessel becomes too high for uniform polymerization;
(c) once polymerization of the methyl or ethyl 2-cyanoacrylate is complete, allowing the reaction mass to cool;
(d) removing polycyanoacrylate polymer formed in step (b) and cooled in step (c) from the reaction vessel;
(e) drying the polycyanoacrylate polymer to provide a dry solid polycyanoacrylate polymer; and
(f) pulverizing the dry solid into a powder, wherein more than 95% of the particle mass in said powder comprises particles having a particle diameter in the range of from 1 to 200 microns, or wherein the particles in said powder have one or more of the following particle size characteristics (i), (ii), and (iii): (i) at least 50 weight-% of the powder particles have a feret length of from 20 to 80 nanometers; (ii) at least 50 weight-% of the powder particles have a feret width of from 10 to 40 nanometers; (iii) at least 50 weight-% of the powder particles have a rectangularity ranging from 60 to 75.