Patent ID: 9335212
Filing Date: 2016-05-10
CPC Classification: C08L,G01J,G01N

Claim Text:
1. A method of evaluating dispersion degrees of a plurality of aromatic epoxy resins in a resin mixture obtained by mixing the aromatic epoxy resins, the method comprising the steps of: taking a plurality of measurement samples from a plurality of sites of the resin mixture, spectroscopically analyzing the measurement samples to obtain spectra using a spectroscopic analyzer, selecting a plurality of common functional group peaks in the spectra of the measurement samples, standardizing absorbances of the selected peaks to obtain absorbance ratios, based on an absorbance of a standard peak, in each of the spectra obtained by the spectroscopic analyzer, calculating standard deviations of the absorbance ratios of the selected peaks between the measurement samples, and comparing a maximum value of the standard deviations with a predetermined threshold value to evaluate the dispersion degrees of the aromatic epoxy resins; wherein the resin mixture contains at least two of a polyfunctional glycidylamine-type epoxy resin represented by a following structural formula (1), a p-aminophenol-type liquid epoxy resin represented by a following structural formula (2), and a bisphenol A-type liquid epoxy resin or a bisphenol A-type solid epoxy resin represented by a following structural formula (3): wherein n is a number of repeating units in the structural formula (3).