Process for the preparation of a high-molecular-weight polycarbo

Details Process for the preparation of a high-molecular-weight polycarbo Process for the preparation of a high-molecular-weight polycarbo

1996-06-04

1998-05-12

Hampton-Hightower, P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528126, 528170, 528322, 528332, 528353, 525419, 525420, C08G 7310, C08G 1802

Patent

active

057506361

ABSTRACT:
This invention provides a process wherein a stable solution of polycarbodiimide with a number-average molecular-weight of 5,000 to 60,000 can be very easily prepared by using an organic diisocyanate (e.g., 2,4-tolylene diisocyanate or 2,6-tolylene diisocyanate) as starting material, a cyclic phosphine oxide as catalyst and a chlorinated aromatic compound as solvent and by controlling certain reaction conditions within the reaction temperature range of 110.degree. to 150.degree. C.

REFERENCES:
Tod W. Campbell, et al "High Polymers Containing the Carbodiimide Repeat Unit" J. Org. Chem., 28, pp. 2069-2075, 1963; the month of publication is not available.
Donald J. Lyman, et al, "Polycarbodiimides and Their Derivatives", Die Maktomol. Chem. 67, pp. 1-9, 1963. The month of publication is not available.

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