Patent ID: 6641620
Filing Date: 2003-11-04
Classification: C09B,D06P,Y10S

Abstract:
A dye mixture comprising(A) (1) a pyrroline type dye of the formula (I) â€ƒwherein R1 is H; and D is a group of the formula (a) wherein R2 is C4H9 and R3 is 1-methyl-n-hexyl, or (2) a mixture thereof with up to 10% by weight of a pyrroline-type dye of the formula (I) wherein R1 is H and each of R2 and R3 is C4H9; and (B) one, two or three anthraquinone type dyes selected from the group of (B1) and (B2), each of the formula (II) â€ƒwherein RB is (CH2)nORB1; n is 1, 2 or 3; and ZB is O; in which dye (B1), RB1 is methyl or ethyl, and in which dye (B2), RB1 is methoxyethyl, ethoxyethyl, methoxymethyl, or ethoxymethyl, and wherein the weight ratio of component (A):component (B) is 10:90 to 30:70.