Invention Grant
- Patent Title: Concentrated direct dye solution
- Patent Title (中): 浓缩直接染料溶液
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Application No.: US897130Application Date: 1978-04-17
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Publication No.: US4227879APublication Date: 1980-10-14
- Inventor: Allan M. Huffman
- Applicant: Allan M. Huffman
- Applicant Address: NC Charlotte
- Assignee: American Color & Chemical Corporation
- Current Assignee: American Color & Chemical Corporation
- Current Assignee Address: NC Charlotte
- Main IPC: C09B67/26
- IPC: C09B67/26 ; C09B27/00 ; D06P1/02
Abstract:
Concentrated solutions of a direct dye having, in the free acid form the formula: ##STR1## are described. The solutions contain 10-30% (by weight) of the dye, 5-20% of one or more specifically defined bases; 0-5% of alkali metal cations; and 45-85% water and have a lower viscosity and solvent to dye ratio than solutions of the dye of similar strength prepared according to prior art methods. The solutions are prepared by isolating the diazonium salt of p- (p-aminophenyl)azo benzenesulfonic acid then coupling the diazo into J-Acid.
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