Technical Paper Archive

This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.

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Gelation and Viscosity Control in Isocyanate Reactions

1958spring kane

Event: 73rd Technical Meeting (INCOMPLETE)
Location: Akron, OH
Date: May 05, 1958
Author: Kane, R.P., Kogon, I.C., Bradley, H.W.
Paper Number:

Price: $20.00

  • The frequent occurrence of abnormal reactions leading to gelation or high viscosities in prepolymers prepared from diisocyanates and polyols has prompted an investigation of the side reactions which take place, and methods for their control. It has been observed in this laboratory and elsewhere (l)
    that undesirable gelation reactions can be tempered or avoided entirely by judicious employment of acidic additives, e.g., acid chlorides. One important source of acidity is the hydrolyzable chlorine in the diisocyanate itself. It is known that abnormal reactions are sometimes prevented merely through use of a different lot of the same diisocyanate and for this reason the source of difficulties often has been ascribed to the diisocyanate. The purpose of this paper is to elucidate the interrelationship of the hydrolyzable chlorine content of the diisocyanate with the purity of the polyol. The observed phenomena are illustrated in model compound studies as well as in typical commercial formulations. Methods for avoiding undesirable side reactions are presented.

    Papers from 73rd Technical Meeting (INCOMPLETE)

    Items from 73rd Technical Meeting (INCOMPLETE)