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2 091 493

(13)

C1

(51)

IPC

(21) (22)

Application

95122428/12, 1995-12-28

(22)

Actual filing date

1995-12-28

(45)

Published

1997-09-27

(72)

Inventor

Chursin V.I.L'Vova A.N.

(73)

Holder

Tsentral'Nyj Nauchno-Issledovatel'Skij Institut Kozhevenno-Obuvnoj Promyshlennosti

METHOD OF SYNTHESIS OF SYNTHETIC TANNING AGENT Russian patent published in 1997 - IPC

Abstract RU 2091493 C1

FIELD: leather industry. SUBSTANCE: aromatic sulfoacid is condensed with formaldehyde in the presence of sodium hydroxide and acetone at heating. Components were taken at the following ratio, wt.-%: aromatic sulfoacid 4.8-34.0; formaldehyde 15-25; sodium hydroxide 0.2-1.0, and acetone 40-80. EFFECT: improved method of synthesis. 1 tbl

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RU 2 091 493 C1

Authors

Chursin V.I.

L'Vova A.N.

Dates

1997-09-27—Published

1995-12-28—Filed

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