US 2026/0201207 A1 · COATING COMPOSITIONS, ARTICLES, AND METHODS OF COATING

Abstract

The present disclosure relates to food or beverage container coating compositions, articles having a coating formed from such compositions, and methods of coating using the compositions to achieve performance in multiple properties at the same time when using select blocked polyisocyanate crosslinkers combined with select hydroxyl-functional polyester polymers. The selected combinations of the blocked polyisocyanate and hydroxyl-functional polyester polymers provide the robust ability to use a wider variety of hydroxyl-functional polyester polymers in terms of peak molecular weight and glass transition temperature to achieve acceptable and/or enhanced performance in terms of plate aging, flow lines, and acid retort performance, while the freedom to use a broader range of concentrations of isocyanate is maintained.

Claims37

Dependent claims

A food or beverage container coating composition suitable for coating, at least a portion of, an inner side of a food container, the food or beverage container coating composition comprising:

a hydroxyl-functional polyester polymer, wherein the hydroxyl-functional polyester polymer has a glass transition temperature (Tg) of 20° C. or higher, as determined by differential scanning calorimetry (DSC);
and
at least one blocked polyisocyanate crosslinker, wherein
(i) the blocked polyisocyanate crosslinker has, on average, at least two primary isocyanate groups per molecule;
and/or
(ii) the blocked polyisocyanate crosslinker has, on average, more than 50 mole percent of the isocyanate groups present on the at least one blocked polyisocyanate crosslinker being primary isocyanate groups;
and/or
(iii) the blocked polyisocyanate crosslinker is a reaction product of ingredients including a diisocyanate having two primary isocyanate groups.

5 more elements

Dependencies are inferred from the claim text.

Coating compositions, articles, and methods of coating

Life of this patent

Coating compositions, articles, and methods of coating

Life of this patent

Abstract

Claims37