Coating compositions of an acrylic polymer and a fluorinated polyisocyanate
AssigneeE. I. Du Pont de Nemours and Company
InventorsDouglas R. Anton, Michael J. Darmon, William F. Graham, Richard R. Thomas
Life of this patent
Estimating the term…
Abstract
A coating composition containing about 45-80% by weight of a binder and 20-55% by weight of an organic liquid; wherein the binder contains (A) about 40-90% by weight, based on the weight of the binder, of an acrylic polymer containing polymerized hydroxyl containing monomers of the following group of hydroxy alkyl acrylate or methacrylates having 1-4 carbon atoms in the alkyl group, and polymerized alkyl acrylates and methacrylates having 1-18 carbon atoms in the alkyl groups, or styrene or any mixtures of the above and (B) about 10-60% by weight, based on the weight of the binder, of a fluorinated organic polyisocyanate crosslinking agent.
Claims7
A coating composition containing about 45-80% by weight of a binder and 20-55% by weight of an organic liquid;
- wherein the binder comprises
- (A) about 40-90% by weight, based on the weight of the binder, of an acrylic polymer consisting essentially of about 20-50% by weight, based on the weight of the acrylic polymer, of polymerized hydroxyl containing monomers selected from the group consisting of hydroxy alkyl acrylate and hydroxy alkyl methacrylates having 1-4 carbon atoms in the alkyl groups, 50-80% by weight, based on the weight of the acrylic polymer, of polymerized monomers selected from the group consisting of alkyl acrylates and alkyl methacrylates having 1-18 carbon atoms in the alkyl groups, styrene or any mixtures of the above and acrylic polymer having a weight average molecular weight of about 2,000-20,000 determined by gel permeation chromatography,
- (B) about 10-60% by weight, based on the weight of the binder, of a fluorinated organic polyisocyanate crosslinking agent consisting essentially of an adduct of a fluorinated monofunctional alcohol and an organic polyisocyanate where the fluorinated monofunctional alcohol is represented by the formula ##STR6## where R.sub.f is a fluoroalkyl containing group having at least 4 carbon atoms, X is a divalent radical, R.sup.3 is H or an alkyl group having 1-4 carbon atoms, n is 1 and m is 1-30, and where about 0.1-33 mole percent of active isocyanate groups are reacted with the fluorinated monofunctional alcohol.
Dependencies are inferred from the claim text.