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1 824 879

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A1

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IPC

(21) (22)

Application

4893340/05, 1990-12-21

(22)

Actual filing date

1990-12-21

(45)

Published

1996-05-20

(72)

Inventor

Mysin N.I.Dergunov Ju.I.Bazin N.A.Poljakov E.V.Sharafanov V.T.

PROCESS FOR PREPARING IMIDE-CONTAINING PREPOLYMER Russian patent published in 1996 - IPC

Abstract SU 1824879 A1

FIELD: imide-containing prepolymers having free isocyanate groups are intended for preparing plyurethanes and thermoinsulation foamed plastics based thereon. SUBSTANCE: process for preparing imide-containing prepolymer having free isocyanate groups comprises thermal polycondensation of tetracarboxylic acid dianhydride and mixture of stillage residue resulting from distillation of toluenediisocyanate containing 45-55 wt. % toluene diisocyanate and polyphenylene polymethylene polyisocyanate in 1:(1-9) ratio in the melt in the presence of catalyst. EFFECT: more efficient preparation process.

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SU 1 824 879 A1

Authors

Mysin N.I.

Dergunov Ju.I.

Bazin N.A.

Poljakov E.V.

Sharafanov V.T.

Dates

1996-05-20—Published

1990-12-21—Filed

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