Azo containing polyurethanes for drug delivery to the large inte

Details Azo containing polyurethanes for drug delivery to the large inte Azo containing polyurethanes for drug delivery to the large inte

1991-12-24

1993-07-06

Foelak, Morton

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...

528 85, 5147723, C08G 1830

Patent

active

052255140

ABSTRACT:
A polyurethane (I) of 1000 to 100,000 in average molecular weight, comprising plural segments, which are each structural units of A-B, A-C and A-D of the formulae: ##STR1## the proportion of the said segments of A-B, A-C and A-D, i.e. x:y:z is in the molar ratio 0.01 to 0.8:0 to 0.80:0 to 0.99, provided that the sum of x, y and z is 1.0; each segment being produced by combining with repeat units of A, B, C and D of the formulae: ##STR2## wherein R.sup.1 is a skeleton of a diisocyanate and the three R.sup.1 's in each of segments A-B, A-C and A-D can be the same or different; aza is a group of the formula: ##STR3## wherein Y.sup.1 and Y.sup.2 which can be the same or different, are oxygen, imino(--NH--) or a group of the formula:

REFERENCES:
patent: 3909497 (1975-09-01), Hendry et al.
patent: 4235988 (1990-11-01), Fildes et al.
patent: 4663308 (1987-05-01), Saffran
Abstract for Meeting of the Society of Polymer Science, Japan.

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