C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/255, 402/291
C08G 59/00 (2006.01) C08G 18/58 (2006.01) C08G 59/06 (2006.01) C08G 59/22 (2006.01) C09D 163/00 (2006.01)
Patent
CA 1236637
ABSTRACT OF THE DISCLOSURE This invention is directed to an advanced epoxy resin and to a coating composition comprising (I) the advanced epoxy resin, (II) a curing quantity of at least one curing agent for component (II), and (III) at least one solvent in a sufficient quantity such that the coating composition including components (I), (II) and (III) and any other desirable components has a suitable application viscosity. This invention is characterized in that the advanced epoxy resin is prepared by reacting in the presence of a suitable catalyst (A) a composition comprising (1) at least one aliphatic diepoxide and, optionally, (2) at least one aromatic diepoxide, with (B) at least one compound having two aromatic hydroxyl groups per molecule, wherein components (A-1) and (A-2) are employed in quantities such that from 10 to 100 percent of the epoxide equivalents contained in component (A) are contributed by component (A-1), from 0 to 90 percent of such epoxide equivalents axe contributed by component (A-2) and wherein components (A) and (B) are employed in quantities such that the resultant advanced epoxy resin has an average epoxide equivalent weight of from 350 to 30,000. The cured advanced epoxy resins of this invention have increased elongation values when cured with a curing quantity of a suitable curing agent as compared to similarly cured advanced resins prepared by reacting together only component (A-2) with component (B). The advanced epoxy resin of this invention requires less solvent to reach a desired viscosity value as compared to the quantity of solvent to reach a like viscosity value for a resin compound from component (A-2) and component (B). The advanced epoxy resins of this invention are useful as automotive primer surfacers, automotive stone chip resistant coatings and coil coatings where somewhat reduced physical and/or chemical properties can be accepted for an improvement in flexibility or a reduction in the amount of volatile solvent required to achieve a suitable application viscosity.
430193
Grays Gwendolyn M.
Hickner Richard A.
Owens Kevin A.
Smart & Biggar
The Dow Chemical Company
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