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Coating compositions prepared from hydroxyl functional graft copolymers
| Details |
Inventors: Das, Suryya K.; Dowbenko, Rostyslaw; Porter, Samuel;
Assignee: PPG Industries, Inc. (Pittsburgh, PA)
Primary Examiner: Jacobs; Lewis T.
Assistant Examiner: Sellers, II; Robert E. L.
Attorney, Agent or Firm: Pingitore; Linda
A coating composition which exhibits excellent sag resistance without the necessity for externally added rheology control agent is prepared from a curing agent and an ungelled hydroxyl functional graft copolymer. The graft copolymer is prepared by the vinyl addition polymerization, in an inert organic solvent, of a vinyl monomer component containing at least a portion of a carboxyl functional vinyl monomer in the presence of a glycidyl ester containing acrylic polymer. The grafting occurs by the condensation reaction between the carboxyl groups of the vinyl monomer component and the epoxy groups of the glycidyl ester containing acrylic polymer. |
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DETAILED DESCRIPTION OF THE INVENTION The ungelled, hydroxyl functional graft copolymer of the present invention is prepared by the free radical initiated vinyl addition polymerization of a vinyl monomer component.
The polymerization is conducted in the presence of a polymer containing epoxy groups.
Either the polymer containing epoxy groups or the vinyl monomer component can contain hydroxyl functionality, so long as at least one of them does.
Preferably both the vinyl monomer component and the polymer containing epoxy groups are hydroxyl functional.
It should be understood that by the term "ungelled" is meant that the graft copolymer is soluble in a suitable solvent with essentially no insoluble fraction.
Examples of suitable solvents include tetrahydrofuran, acetone, xylene and other similar common organic solvents.
A gelled material is a three dimensional crosslinked matrix which cannot be dissolved in common organic solvents and whose molecular weight by gel permeation chromatography cannot be determined.
In addition, it is believed that the presence of gelled material interferes with the rheology of a polymeric product resulting in poor atomization during spray application and poor flow in coating applications.
Moreover, by "hydroxyl functional" is meant predominantly that hydroxyl functionality which comes from the hydroxyl functional vinyl monomers of the vinyl monomer component.
There is also some minor proportion which is generated from the reaction of epoxy groups with carboxyl groups.
The vinyl monomer component comprises at least a portion of a carboxyl functional vinyl monomer.
Moreover, it is preferred that the vinyl monomer component is free of epoxy group containing vinyl monomers.
Examples of suitable carboxyl functional vinyl monomers include acrylic acid, methacrylic acid and monoesters of unsaturated dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid, for example, mono(hydroxyethyl) and mono(hydroxypropyl) esters of maleic acid.
The balance of the vinyl monomer component can include a variety of other vinyl monomers which contain polymerizable vinyl unsaturation
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