Radiant energy – Luminophor irradiation – Methods
Patent
1995-04-17
1996-11-12
Willis, Davis L.
Radiant energy
Luminophor irradiation
Methods
2504611, G01N 2164
Patent
active
055742882
ABSTRACT:
A method of measuring intensity of radiant energy fluoresced by a fluorescer in a radiation-cured coating. The method comprising the steps of: a) providing a coating comprising: i) a radiation-curable monomer or oligomer; and ii) a fluorescer having an excitation energy at a wavelength .lambda..sub.2, the fluorescer fluorescing radiant energy of a wavelength .lambda..sub.3 ; b) curing the coating by exposure to radiant energy, thereby changing the intensity of radiant energy that would be fluoresced by the fluorescer if exposed to wavelength .lambda..sub.2 ; c) illuminating the radiation-cured coating with excitation energy of a wavelength .lambda..sub.2, wherein at least 50% of the excitation energy is absorbed by the upper 75 .mu.m of the radiation-cured coating; and d) measuring the intensity of the radiant energy fluoresced by the fluorescer at wavelength .lambda..sub.3. The above method can be used to measure the amount of residual radiation-curable monomer or oligomer present in a radiation-cured coating. This method of measuring residual monomer is especially useful where the intensity of the radiant energy fluoresced by the fluorescer at wavelength .lambda..sub.3 changes with the concentration of unreacted radiation-curable monomer or oligomer in the radiation-cured coating.
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Harklau Lanny L.
Simpson J. Thomas
Hanig Richard
Minnesota Mining and Manufacturing Company
Willis Davis L.
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