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US 2025/0136822 A1Published application
Metal packaging powder coating compositions, coated metal substrates, and methods
AssigneeSwimc LLC
InventorsRichard D. JOSLIN, Charles I. SKILLMAN, Joseph DESOUSA
Life of this patent
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Abstract
Powder coating compositions, particularly metal packaging powder coating compositions, coated metal substrates, and methods; wherein the powder coating compositions include powder polymer particles comprising a polymer having a number average molecular weight of at least 2000 Daltons, wherein the powder polymer particles have a particle size distribution having a D50 of less than 25 microns; and, in certain embodiments, one or more charge control agents in contact with the powder polymer particles.
Claims35
1-30. (canceled)
A powder coating composition comprising:
- powder polymer particles having a particle size distribution with a D50 of less than 20 microns and comprising a polyester polymer including cyclic groups and having a number average molecular weight of at least 2,000 Daltons;
- one or more of a crosslinker, a cure catalyst, or a lubricant;
- wherein the powder coating composition:
- (i) is a thermoset food or beverage can coating composition,
- (ii) contains, if any, less than 0.5 wt-% of vinyl chloride materials and other halogenated vinyl materials, and
- (iii) is substantially free of each of bisphenol A and structural units derived therefrom, bisphenol F and structural units derived therefrom, and bisphenol S and structural units derived therefrom.
3 more elements
A powder coating composition comprising:
- at least 50 wt-% of powder polymer particles formed via spray drying and comprising a polyester polymer including cyclic groups and having a number average molecular weight of at least 2,000 Daltons, wherein the powder coating composition comprises at least 50 wt-% of the powder polymer particles;
- a phenolic crosslinker;
- wherein the powder coating composition:
- (i) is an interior thermoset food or beverage can coating composition,
- (ii) has an overall particle size distribution with a D90 of less than 20 microns,
- (iii) contains, if any, less than 0.5 wt-% of vinyl chloride materials and other halogenated vinyl materials, and
- (iv) is substantially free of all bisphenol compounds and structural units derived therefrom, with the exception of TMBPF and structural units derived therefrom which may optionally be present.
4 more elements
Dependencies are inferred from the claim text.