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2 039 763

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C1

(51)

IPC

(21) (22)

Application

92009669/05, 1992-12-04

(22)

Actual filing date

1992-12-04

(45)

Published

1995-07-20

(72)

Inventor

Prosekova L.I.Kumskov V.N.Lykova G.P.Timofeeva N.M.Lavrichenko V.V.

(73)

Holder

Aktsionernaja Firma

PROCESS FOR PREPARING NOVOLAC PHENOL FORMALDEHYDE RESINS Russian patent published in 1995 - IPC

Abstract RU 2039763 C1

FIELD: electronics and electrical engineering. SUBSTANCE: the phenol component and formaldehyde are heated to boiling in the presence of an acid catalyst and condensation is carried out, the supernatant water is then removed. Distillation begins at 200-240 C 1.0 to 1.5 hours later 3 to 10 wt parts of water per 100 wt parts of the phenol component are added to obtain resins having a vary low content of residual phenol and residual formaldehyde. EFFECT: greater efficiency of the process and reduced energy consumption. 1 tbl

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RU 2 039 763 C1

Authors

Prosekova L.I.

Kumskov V.N.

Lykova G.P.

Timofeeva N.M.

Lavrichenko V.V.

Dates

1995-07-20—Published

1992-12-04—Filed

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