Biodegradable polyurethane urea acyl semicarbazides for the manu

Details Biodegradable polyurethane urea acyl semicarbazides for the manu Biodegradable polyurethane urea acyl semicarbazides for the manu

1982-03-26

1984-03-20

Welsh, Maurice J.

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 76, C08G 1810, C08G 1838

Patent

active

044382499

ABSTRACT:
Polyurethane urea acyl semicarbazides for preparing biodegradable alloimplants having the general formula: (--NH--R.sub.1 --CONHNHCONH--R.sub.2 --NHCO--O--R.sub.3 --CONH--R.sub.2 --NH--CO--).sub.n where n=5-24; R.sub.1 is selected from the group consisting of ##STR1## R.sub.2 is selected from the group consisting of --(CH.sub.2).sub.6 --, --C.sub.6 H.sub.4 -- CH.sub.2 -- C.sub.6 H.sub.4.sup.- ; R.sub.3 is selected from the group consisting of --(CH.sub.2).sub.4 --O--.sub.14, --(CH.sub.2).sub.4 --O--.sub.21.

REFERENCES:
Tanada et al., Chem. Abstr. 74, 113122n, 1971.
Naka et al., Chem. Abstr. 77, 165805u, 1977.
Negishi et al., Chem. Abstr. 71, 22833s, 1969.

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