Improvements in the manufacture and production of readily soluble tanning extracts or agents

摘要

144,677. Hassler, F. Dec. 19, 1913, [Convention date]. Extracts, making and treating. - Tanning extracts or materials are rendered readily soluble even in cold water, by the addition of sulphonic acids of the hydrocarbons contained in coal tar fractions of high boiling point or of heat condensation products thereof either, in the free state or in the form of a salt. Specifications 24982/12 and 18259/13 are referred to. The Specification as open to inspection under Sect. 91 (3) (a) comprises the use of sulphonic acids of at least tri-cyclic hydrocarbons, or of heat condensation products of non-hydroxylated aromatic sulphonic acids either in the free state or in the form of salts. In an example, 100 parts by weight of quebracho extract of about 25‹ BÚ. are mixed with 15 parts of a sodium salt of a sulphonic acid of anthracene, phenanthrene, carbazol, or mixtures or raw products thereof, or heat condensation products prepared therefrom or from sulphonic acids of lower aromatic hydrocarbons such as naphthalene or toluene sulphonic acids. Other tanning extracts such as mangrove may be similarly treated. This subject-matter does not appear in the Specification as accepted.