Patent ID: 6060520
Filing Date: 2000-05-09
Classification: C03C,H01J,Y10S

Abstract:
An aqueous emulsion based on acrylic polymers for coating of cathode ray tube, comprising at least one acrylic polymer having a filming temperature between about 20 and 40.degree. C. which at least one acrylic polymer after drying produces film which, is submitted to heating to remove the polymeric film, the thermogravimetric analysis of which being carried out on 20 mg of product in the form of a disk having a diameter of about 4 mm and a 1.5 mm thickness, in inert ambient, for the following cycle of heating which simulates that utilized in a cathode ray tube process:11.degree. C./minute from 25 to 375.degree. C.,5.degree. C./minute from 375 to 440.degree. C.,isotherm at 440.degree. C. for 45 minutes,respectively of, having the weight loss .DELTA.P/P % was the following:from 25 to 245.degree. C. lower than 15% by weightfrom 245 to 375.degree. C. from 30 to 70% by weightfrom 375 to 440.degree. C. from 97 to 99% by weight, andafter the isotherm at 440.degree. C. the remaining residue is lower than about 0.3% by weight, a curve gradient in an onset point ranging from 0.03 to 0.08 mg/.degree. K, and at 360.degree. C. from 0.12 to 0.30 mg/.degree. K; the onset temperature being at most 300.degree. C.