# US 2019/0168259 A1 · Improvement of edge build and edge blister performance of coil coatings

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- Number: US 2019/0168259 A1
- Document ID: US20190168259A1
- Status: Published application
- Kind: A1
- Application number: 16/324,344
- Filed: 2017-08-10
- Published: 2019-06-06
- Earliest claimed: 2016-08-10
- Assignees: Swimc LLC
- Applicants: Swimc LLC
- Inventors: Zhilian ZHOU; Charles I. Skillman; Richard H. Evans; Nhan T. Huynh
- Web page: https://patentgrep.com/patent/US20190168259A1

## CPC

- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- B05D 3/102: {Pretreatment of metallic substrates (C23C takes precedence)}
- B05D 3/108: {Curing}
- B65D 25/14: Linings or internal coatings (of containers made by folding or erecting blanks made of paper B65D5/56 {; linings for domestic water storage heaters F24H1/183})
- B65D 85/72: for edible or potable liquids, semiliquids, or plastic or pasty materials
- C09D 5/02: Emulsion paints {including aerosols}
- C09D 123/00: Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D 133/04: Homopolymers or copolymers of esters {(C09D143/04 takes precedence)}
- C09D 167/00: Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers
- B05D 1/26: performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
- B05D 2202/15: Stainless steel
- B05D 2202/25: based on Al
- B05D 2252/02: of indefinite length
- B05D 2401/21: Mixture of organic solvent and water
- B05D 2502/00: Acrylic polymers
- B05D 2504/00: Epoxy polymers
- B05D 2507/00: Polyolefins
- B05D 2508/00: Polyesters
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A liquid polymeric coating composition that upon application to a substrate, such as a coil substrate, preferably does not exhibit the edge build and edge blistering that commonly occurs with conventional liquid polymeric coating compositions. In some embodiments, the liquid polymeric coating composition is modified by tailoring the surface tension, the openness of the coating composition as indicated by the modulus of elasticity, or a combination thereof to reduce edge build and edge blistering.

## Claims

### Claim 1

A method comprising:
(a) providing a coil substrate,
(b) applying a liquid polymeric coating composition to a surface of the coil substrate, wherein the liquid polymeric coating composition comprises at least 15% by weight solids, and exhibits one or both of (i) a surface tension of at least 31.7 dyne/cm according to the Surface Tension Test, or (ii) an inflection point for a modulus of elasticity of at least 160° C. according to the Dynamic Mechanical Analysis Test Procedure, and
(c) curing the liquid polymeric coating composition to form a coating on the surface of the coil substrate.

### Claim 2 (depends on 1)

A method according to claim 1, wherein, in the absence of any cutting along the lateral edges after application of the coating composition, the coating has an average thickness at the lateral edges of the coil substrate varying no more than 50% from the average thickness of the coating away from the edges in a cross-substrate direction.

### Claim 3 (depends on 1)

A method according to claim 1, wherein the liquid polymeric coating composition comprises (i) an epoxy polymer, an acrylic polymer, and an optional crosslinker, (ii) a polyester polymer and an optional crosslinker, (iii) a polyolefin polymer and an optional crosslinker, or (iv) a latex polymer and an optional crosslinker.

### Claim at position 4

4-6. (canceled)

### Claim 7 (depends on 3)

A method according to claim 3, wherein the liquid polymeric coating composition comprises an aqueous liquid carrier including one or more water miscible organic solvents.

### Claim 8

(canceled)

### Claim 9 (depends on 7)

A method according to claim 7, wherein the crosslinker is present and comprises one or more phenoplasts, aminoplasts, blocked or unblocked isocyanates, or a mixture thereof.

### Claim 10 (depends on 1)

A method according to claim 1, wherein the coil substrate comprises an aluminum coil or a steel coil.

### Claim 11

(canceled)

### Claim 12 (depends on 1)

A method according to claim 1, wherein the coil substrate is pretreated with a chromium-based compound or a non-chromium-based compound before applying the liquid polymeric coating composition.

### Claim 13 (depends on 1)

A method according to claim 1, wherein the coating is an interior food-contact coating suitable for use on an interior of a riveted food or beverage can end.

### Claim 14 (depends on 13)

A method according to claim 13, wherein the interior food-contact coating on the food or beverage can end passes less than 10 milliamps of current when tested in accordance with the Porosity Test for initial porosity.

### Claim 15 (depends on 1)

A method according to claim 1, wherein applying the liquid polymeric coating composition to the surface of the coil substrate comprises applying the liquid polymeric coating composition on a continuously moving surface traveling at a line speed of about 50 meters per minute to about 400 meters per minute.

### Claim at position 14

16-19. (canceled)

### Claim 20

A food or beverage container, or a portion thereof, comprising a metal substrate, wherein at least a portion of the metal substrate is coated with a coating prepared from a liquid polymeric coating composition comprising: a polymeric resin, an optional crosslinker, an optional catalyst, and an optional wax wherein the liquid polymeric coating composition possesses one or more of (i) a surface tension of at least 31.7 dyne/cm according to the Surface Tension Test, or (ii) an inflection point for a modulus of elasticity of at least 160° C. according to the Dynamic Mechanical Analysis Test Procedure.

### Claim 21 (depends on 20)

A food or beverage container according to claim 20, wherein the polymeric resin comprises (i) an epoxy polymer, an acrylate polymer, and an optional crosslinker, (ii) polyester resin, an acrylate resin, and an optional crosslinker, (iii) a polyolefin polymer and an optional crosslinker, or (iii) a latex polymer and an optional crosslinker.

### Claim at position 17

22-24. (canceled)

### Claim 25 (depends on 20)

A food or beverage container according to claim 20, wherein the coating is an interior food-contact coating of a riveted food or beverage can end.

### Claim 26 (depends on 20)

A food or beverage container according to claim 20, wherein the liquid polymeric coating composition comprises an aqueous carrier liquid that includes one or more water miscible organic solvents.

### Claim 27 (depends on 20)

A food or beverage container according to claim 20, wherein the liquid polymeric coating composition comprises at least 15 wt % solids.

### Claim at position 21

28-29. (canceled)

### Claim 30

A composition suitable for forming an interior food-contact coating of a food or beverage container comprising a liquid polymeric coating composition, wherein the liquid polymeric coating composition comprises at least 15% by weight solids, and possesses one or both of (i) a surface tension of at least 31.7 dyne/cm according to the Surface Tension Test, or (ii) an inflection point for modulus of elasticity of at least 160° C. according to the Dynamic Mechanical Analysis Test Procedure.

### Claim 31 (depends on 30)

A composition according to claim 30, wherein the liquid polymeric coating composition has a viscosity of about 10 cp to about 300 cp, in a shear rate range of 10 to 20,000 (s−1).

### Claim 32 (depends on 30)

A composition according to claim 30, wherein the liquid polymeric coating composition comprises (i) an epoxy polymer, an acrylate polymer, and an optional crosslinker, (ii) a polyester polymer and an optional crosslinker, (iii) a polyolefin polymer and an optional crosslinker, or (iv) an acrylic polymer and an optional crosslinker.

### Claim 33 (depends on 30)

A composition according to claim 30, wherein the liquid polymeric coating composition comprises an aqueous carrier that includes one or more water miscible organic solvents.

### Claim 34 (depends on 30)

A composition according to claim 30, wherein the crosslinker is present and comprises one or more phenoplasts, aminoplasts, blocked or unblocked isocyanates, or a mixture thereof.

### Claim 35

(canceled)