Polyester coil coating formulation
AssigneeDow Global Technologies LLC
InventorsGary E. Spilman, Scott J. Bis, Paul J. Popa
Life of this patent
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Abstract
In a curable coil coating composition comprising a mixture of: (a) a curable polyester that is a liquid at room temperature, (b) a cross-linking agent; and (c) a solvent; the improvement comprising preparing the polyester from a composition comprising a mixture of 1,3- and 1,4-cyclohexane dimethanol wherein the molar ratio of the 1, 3 isomer to the 1, 4 isomer is from about 60:40 to about 5:95. Cured coil coatings prepared from these compositions exhibit an excellent combination of flexibility and hardness.
Claims20
A curable coil coating composition comprising a mixture of:
- (a) a curable polyester that is a liquid at room temperature,
- (b) a cross-linking agent;
- and
- (c) a solvent;
- wherein the polyester comprises, in polymerized form, a mixture of 1,3- and 1,4-cyclohexane dimethanol wherein the molar ratio of the 1, 3 isomer to the 1, 4 isomer is from about 60:40 to about 5:95.
A process for preparing an improved polyester coil coating composition, wherein a polyester is prepared by a process wherein a polyhydroxy monomer comprising a diol is reacted with a monomer comprising a polyfunctional acid, the process comprising employing as the diol a composition comprising a mixture of 1,3- and 1,4-cyclohexane dimethanol wherein the ratio of the 1, 3 isomer to the 1, 4 isomer is from about 60:40 to about 5:95.
Dependencies are inferred from the claim text.