Graft copolymer useful in electrodeposition
AssigneeE. I. Du Pont de Nemours and Company
InventorIsidor Hazan
Life of this patent
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Abstract
A polyamine/epoxy ether graft copolymer having an acrylic polamine backbone with secondary amine and hydroxy functionality, part of which is terminal primary hydroxy groups, onto which is grafted an epoxy ether. The ether is an epoxy resin preferably reacted with nonylphenol resulting in a monoepoxide ether with one or less epoxy group per epoxy ether molecule. The ether is reacted with part of the secondary amine on the acrylic backbone. This system can be formulated to a nearly-neutral pH cathodic dispersion with good cure response at 150.degree.-175.degree. C. using conventional aminoplast crosslinkers.
Claims13
As a new composition of matter, a graft copolymer comprising a mono-epoxide portion grafted onto an acrylic-amine backbone portion, which portions consist essentially of, by weight based on the graft copolymer, about:
- (a) 25-60% of an acrylic-amine backbone copolymer contributing:
- 14.7-35% of secondary amine acrylate or methacrylate, giving 0.08 to 0.2 equivalent of tertiary amine per 100 grams of graft copolymer,
- 7-17% of hydroxy-functional acrylate or methacrylate,
- 3-7.3% ethyl acrylate or methyl methacrylate, and
- 0.3-0.7% mercaptoethanol, giving primary terminal hydroxy functionality,
- graft polymerized with (b) and (c):
- (b) 33-60% of an epoxy copolymer of a condensation polymer of equimolar proportions of epichlorohydrin and bisphenol-A and reacted with an entity selected from the group consisting of alkyl phenols, alkyl alcohols and alkyl hydroxy ethers, with 1-20 carbon atoms in the alkyl groups, hydroxyamines, fatty amines and mercaptans, in a mole ratio of epoxy resin to said entity in the range of 1/1.1-1.9, and
- (c) 7-15% of a glycidyl ester of a tertiary carboxylic acid containing 9 to 11 carbon atoms.
Dependencies are inferred from the claim text.