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dyeing from water baths. Under the name of “caprosols” they appeared much earlier than
similar foreign dyes.
1.1.6. Derivatives of Aroilenbenzimidazoles Dyes for Polyamides Dyeing in
Mass
Analysis of literature data allows to select one group of dyes synthesis of which is
specially intended for mass dyeing of synthetic fibres. There is a variety of dyes -
aroilenbenzimidazoles, products of condensation of ortho - (peri-) di - and tetracarboxylic
acids with monoamines or ortho- and peri - diamines [104, 105] which belong to this group.
As it is known the most valuable are high - temperature dyes of bis-alkyl-imides type of
perylene - tetra-carboxylic acid [106], dyeing PA fibres into red, for example: pigment red I,
formed at interaction between dianhydride perylene - 3, 4, 9, 10 - tetracarboxylic acid and m
- xylidine, of the following structure:
possessing high light fastness. However, it hardly dissolves in polymer melt and requires
thorough dispersion.
Interesting works on the synthesis of dyes-derivatives of aroilenbenzimidazoles were
done first by the firm “Francolor” and them continued by different researchers [107]. The use
of o - phenylene diamine; perinaphthi - lendiamine; 5, 6 -diaminoacetonaphthene; 9, 10 -
diaminophenanthrene and 1, 2, 4, 5, - tetraaminobenzole are described as amino component,
and the use of the following acids: phthalic, perylene - 3, 4, 9, 10 - tetracarboxylic, piro-
mellate, antrachinone - 1, 2 and 2, 3 - dicarboxylic, benzo - 1, 2 - antrachinone - peri -
dicarboxylic and also 1, 3 - dicarboxylic aliphatic acids - as the second component. Both
components may contain substituents (excepting sulpho group). Universal dye of brown
colour may be the example:
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