The Dow Chemical Company

Michael L Gould

Richard A Hickner

Marvin L Dettloff

James A Rabon, Jr

David A Grilli

A coating composition applied to a substrate, the composition containing a solids content of at least about 65 percent by weight and including a polyanhydride having more than one non-cyclic moiety, a co-reactant resin such as a glycidyl (meth)acrylate-containing polymer, and a latent catalyst, wherein the equivalent ratio of epoxy to anhydride groups is from about 0.8:1 to 1.3:1.

Substrate coated with composition of non-cyclic polyanhydride and

A coating composition applied to a substrate wherein the composition contains a solids content of at least about 65 percent by weight and includes a polyanhydride having more than one non-cyclic anhydride moiety, a glycidyl groups-containing oligomer, a catalyst and a surfactant or flow-control agent.

A coating composition with a solids content of at least about 65% by weight comprises a polyanhydride having more than one non-cyclic anhydride moiety, a co-reactant resin such as a glycidyl (meth)acrylate-containing polymer and a latent catalyst wherein the equivalent ratio of epoxy to anhydride is from about 0.8:1 to 1.3:1.

Coating composition of non-cyclic polyanhydride and co-reactant resin

A coating composition with a solids content of at least about 65% by weight comprises a polyanhydride having more than one non-cyclic anhydride moiety, a glycidyl groups-containing oligomer, a catalyst and a surfactant or flow-control agent.

Coating composition of non-cyclic polyanhydride and glycidyl oligomer

A polyanhydride having a molecular weight of no more than about 2000 is useful in a coating composition with a coreactant resin such as an epoxy resin and comprises: (a) a polyvalent organic moiety; (b) a plurality of ester linkages bonded to the polyvalent organic moiety; (c) divalent organic moieties bonded to the ester linkages; and (d) non-cyclic anhydride moleties bonded to the divalent organic moleties.

Polyanhydride containing non-cyclic anhydride moieties

Compositions of coreactant resins, such as an epoxy resin, and polyanhydrides that contain non-cyclic anhydride moieties are cured to provide coatings that have good exterior durability. Preferred high molecular weight polyanhydrides contain a central polymer moiety that has no more than about 25 weight percent repeating units derived from unsaturated aliphatic hydrocarbon monomers. In other preferred polyanhydrides, the anhydride moleties are linked to a central moiety by an ester moiety.

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Michael L Gould