Polyarylimidazolidines with phenolic hydroxyl end groups

Details Polyarylimidazolidines with phenolic hydroxyl end groups Polyarylimidazolidines with phenolic hydroxyl end groups

1991-08-05

1993-08-24

Higel, Floyd D.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

525195, 525218, 525304, 5253283, 525420, 525215, 528 67, 528 73, 528 85, 528211, 528367, 528390, 528423, 528 65, 5483175, 5483181, C08G 1800, C08G 1870, C08G 1877, C08G 1840

Patent

active

052390390

ABSTRACT:
Polyarylimidazolidines with a degree of polymerization of about one to twenty and having phenolic hydroxyl end groups and a novel three-step process for their preparation are described. In the first step of the process, an excess of hydrogen cyanide is reactive with an aryl diisocyanate. The excess hydrogen cyanide promotes polymerization and avoids the reaction of the imino hydrogen on the heterocyclic range with the diisocyanate to form cross linkage and associated gel formation. In the second step, a stoichiometric amount of diisocyanate is added to react with the excess hydrogen cyanide and one hydroxyl of a phenolic dihydroxyl end capping group. In the final third step, the dihydroxyl end capping group is added and the remaining diisocyanate reacts with one of the two phenolic hydroxyls on the end capping group.

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patent: 4330453 (1982-05-01), Patton
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