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2 045 579

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IPC

(21) (22)

Application

93026763/12, 1993-05-26

(22)

Actual filing date

1993-05-26

(45)

Published

1995-10-10

(72)

Inventor

Romanova E.V.Stavtsev G.A.Shimenovich B.S.Kopylov V.M.Polozenko G.N.Shishkin V.A.

(73)

Holder

Nauchno-Proizvodstvennoe Ob"Edinenie Nauchno-Issledovatel'Skij Institut Kozhevenno-Obuvnoj Promyshlennosti"

METHOD OF PREPARING TANNING AGENT FOR LIGHT LEATHER Russian patent published in 1995 - IPC

Abstract RU 2045579 C1

FIELD: production of tanning agent. SUBSTANCE: vat residue of production of diphenylolpropane is sulfurized. Then polycondensation of thus prepared product and formaldehyde is carried out. The process takes place within 3-4 h. Quantities of mentioned above ingredients are as follows: vat residue of production of diphenylolpropane 32-44 mass sodium sulfite 8-10 mass formaldehyde 6-8 mass and water. EFFECT: improves efficiency of the method. 2 tbl

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RU 2 045 579 C1

Authors

Romanova E.V.

Stavtsev G.A.

Shimenovich B.S.

Kopylov V.M.

Polozenko G.N.

Shishkin V.A.

Dates

1995-10-10—Published

1993-05-26—Filed