Coating composition comprising an anhydride-containing polymer and a structured epoxy-containing polymer
AssigneeE. I. Du Pont de Nemours and Company
InventorsLee R. Harper, Gayann S. McDonnell
Life of this patent
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Abstract
A coating composition, useful for finishing automobiles and trucks, in which the film forming binder contains, as reactive binder components, a mixture of a first polymer having at least two reactive anhydride groups and a second polymer or oligomer having at least two reactive epoxy groups, characterized by the second polymer being structured so that the epoxy groups are skewed to have a majority thereof at one end of the polymer.
Claims17
A coating composition comprising a binder in 20-80% by weight of an organic liquid carrier and about 0.1-5% by weight, based on the weight of the binder, of a curing catalyst, wherein the binder comprises the following:
- (a) 25-90% by weight, based on the weight of the binder, of an anhydride functional polymer having at least two reactive anhydride groups and having a weight average molecular weight of about 2,000-50,000;
- and
- (b) 5-50% by weight, based on the weight of the binder, of an epoxy functional polymer having at least two reactive epoxy groups, wherein the epoxy functional polymer is structured as a product of group transfer polymerization, so that the epoxy groups are skewed to have a majority of the epoxy groups at one end of the polymer, which end was first formed during said group transfer polymerization.
Dependencies are inferred from the claim text.