US 7,579,420 B2
	Hyperbranched maleic anhydride-diene polymers
Stephen Ernest Jacobson, Hockessin, Del. (US); and Patricia Metzger Cotts, Wilmington, Del. (US)
Assigned to E. I. du Pont de Nemours and Company, Wilmington, Del. (US)
Filed on Apr. 04, 2006, as Appl. No. 11/397,667.
Prior Publication US 2007/0232770 A1, Oct. 04, 2007
Int. Cl. C08F 222/06 (2006.01); C08F 236/06 (2006.01)

U.S. Cl. 526—272  [526/224; 526/338; 526/339; 526/340.3]

12 Claims

1. A hyperbranched polymer comprising polymer units derived from (a) maleic anhydride and (b) at least one terminally-unsaturated, acyclic aliphatic diene having at least 7 carbon atoms; wherein said polymer has at least one pendent olefinic group for each 10 polymer units, wherein the polymer has a Mark-Houwink coefficient α is in the range of 0 <α<0.5 and the polymer has a coefficient B in the range of ⅓<B <0.5, the maleic anhydride and the diene are in the polymer backbone and wherein the diene is selected from the group consisting of 1,7-octadiene, 1,9-decadiene, 1,11-dodecadiene, 1,13-tetradecadiene and mixtures of two or more thereof.