Process for the preparation of polyhydantoins which can be proce

Details Process for the preparation of polyhydantoins which can be proce Process for the preparation of polyhydantoins which can be proce

1990-02-12

1991-04-09

Kight, III, John

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

Synthetic resins

From carboxylic acid or derivative thereof

528 73, 528 53, 548313, C08G 2200

Patent

active

050066412

ABSTRACT:
Polyhydantoins of the type mentioned may be prepared by reacting initially in a first step, bis-glycine esters with between 1 and 2 moles of diisocyanate per mole of bis-glycine ester in a liquid reaction medium, and after forming the polyurea from this bis-glycine ester and the diisocyanate, by further reacting in a second step with an amount of a monoglycine ester equivalent to the residual amount of isocyanate end groups, and finally by carrying out the cyclocondensation to give the polyhydantoin by removing hydroxyl compounds.

REFERENCES:
patent: 3903053 (1975-09-01), Iwata et al.

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