Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1991-12-31
1993-07-06
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
525415, 606228, C08G 6308, C08L 6704
Patent
active
052255212
ABSTRACT:
Star-shaped poly (hydroxyacid) chains and the process for preparing them are disclosed. The star shaped polymers have the residue of a central polyfunctional compound having at least 5 hydroxyl or amino groups and 5 to 100 carbon atoms with polymeric arms attached to the functional groups. The polymeric arms are formed from lactide, glycolide or caprolactone. In a preferred aspect the inner segment of the arms are an amorphous copolymer of D-lactide and L-lactide and the outer segment of the arms are a semicrystalline polymer of one of L-lactide or D-lactide.
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Dodson Shelley A.
E. I. Du Pont de Nemours and Company
Kight III John
Stevenson Robert B.
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