Patent ID: 6218087
Filing Date: 2001-04-17
Classification: G03F

Abstract:
A photoresist stripping liquid composition of which the CIE 1976 L*a*b* color difference (.DELTA.E*.sub.ab) which is specified in JIS (=Japanese Industrial Standard) Z 8730 and expressed by the following equation 1 is 30-180 (as referenced to pure water):.DELTA.E*.sub.ab =[(.DELTA.L*).sup.2 +(.DELTA.a*).sup.2 +(.DELTA.b*).sup.2 ].sup.1/2 (equation 1)where .DELTA.L*, .DELTA.a* and .DELTA.b* are all specified in JIS Z 8729, .DELTA.L* representing the difference between the psychometric lightness values (L*) of two non-luminous object colors in the CIE 1976 L*a*b*, .DELTA.a* representing the difference between the values of one psychometric chroma coordinate (a*) of said two non-luminous object colors, and .DELTA.b* representing the difference between the values of the other psychometric chroma coordinate (b*) of said two non-luminous object colors, provided that L*, a* and b* are determined by the following equations 2 and 3, where each of X/X.sub.n, Y/Y.sub.n and Z/Z.sub.n is greater than 0.008856:L*=116(Y/Y.sub.n).sup.1/3 -16 (equation 2)(where Y is a tristimulus value in the CIE 1931 standard colorimetric system, and Y.sub.n is the Y value of a perfect reflecting diffuser under standard light);a*=500[(X/X.sub.n).sup.1/3 -(Y/Y.sub.n).sup.1/3 ]b*=200[(Y/Y.sub.n).sup.1/3 -(Z/Z.sub.n).sup.1/3 ] (equation 3)(where X, Y and Z are tristimulus values in the CIE 1931 standard colorimetric system, and X.sub.n, Y.sub.n and Z.sub.n are the tristimulus values of a perfect reflecting diffuser in the CIE 1931 standard colorimetric system).