# US 10,370,152 B2 · Coating composition comprising a high Mn polyester and a low Mn polyester

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- Number: US 10,370,152 B2
- Document ID: US10370152B2
- Status: Granted
- Kind: B2
- Application number: 15/524,794
- Filed: 2015-11-05
- Published: 2017-11-09
- Granted: 2019-08-06
- Earliest claimed: 2014-11-05
- Assignees: PPG Coatings (Suzhou) Co., Ltd.
- Applicants: PPG Packaging Coatings (Suzhou) Co., Ltd.
- Inventors: Feng Han; Cunyi Fan; Shimin Wang
- Web page: https://patentgrep.com/patent/US10370152B2

## CPC

- 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 65/42: Applications of coated or impregnated materials
- C09D 167/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence)
- 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)

## Abstract

A coating composition including (a) a first polyester material having a number-average molecular weight (Mn) of 500 to 5,500 Daltons, and (b) a second polyester material having a number-average molecular weight (Mn) of 6,000 to 100,00 Daltons. The first polyester material may have a glass transition temperature (Tg) of from 40° C. to 120° C. The coating composition is useful for, among other things, coating food and/or beverage containers, such as an undercoat layer of a two layer coating system that includes an undercoat layer and an overcoat layer.

## Claims

### Claim 1

A coating composition comprising;
(a) a first polyester material having a number-average molecular weight (Mn) of 500 to 5,500 Daltons, and a glass transition temperature (Tg) of from 40° C. to 120° C.; and
(b) a second polyester material having a number-average molecular weight (Mn) of 6,000 to 100,000 Daltons.

### Claim 2 (depends on 1)

The coating composition according to claim 1, wherein the second polyester material comprises terephthalic acid and 1,2-propanediol.

### Claim 3 (depends on 1)

The coating composition according to claim 1, wherein the second polyester material has a glass transition temperature (Tg) of at least 80° C.

### Claim 4 (depends on 1)

The coating composition according to claim 1, wherein the coating composition comprises the first polyester material in amounts from 1 wt % to 50 wt % based on the total solid weight of the coating composition.

### Claim 5 (depends on 1)

The coating composition according to claim 1, wherein the coating composition comprises the second polyester material in amounts from 10 wt % to 50 wt % based on the total solid weight of the coating composition.

### Claim 6 (depends on 1)

The coating composition according to claim 1, wherein the coating composition further comprises a crosslinking agent.

### Claim 7

A coating composition comprising;
(a) a first polyester material having a number-average molecular weight (Mn) of 500 to 5,500 Daltons; and
(b) a second polyester material having a number-average molecular weight (Mn) of at least 6,100 Daltons and a glass transition temperature (Tg) of at least about 80° C.,
wherein the second polyester material (b) comprises the reaction product of
(i) 1,2-propanediol,
(ii) terephthalic acid, and
(iii) a molecular weight increasing agent.

### Claim 8 (depends on 7)

The coating composition according to claim 7, wherein the molecular weight increasing agent comprises a polyacid, a polyol, or a combination thereof.

### Claim 9 (depends on 8)

The coating composition according to claim 8, wherein the polyacid comprises maleic anhydride, itaconic acid, or a combination thereof.

### Claim 10 (depends on 8)

The coating composition according to claim 8, wherein the polyol comprises trimethylolpropane.

### Claim 11 (depends on 1)

A food and/or beverage container coated on at least a portion thereof with the coating composition according to claim 1.

### Claim 12

A two layer coating system for a food and/or beverage container comprising an undercoat layer and an overcoat layer, wherein the undercoat layer comprises;
(a) a first polyester material having a number-average molecular weight (Mn) of 500 to 5,500 Daltons, and a glass transition temperature (Tg) of from 40° C. to 120° C.; and
(b) a second polyester material having a number-average molecular weight (Mn) of 6,000 to 100,000 Daltons.

### Claim 13 (depends on 12)

The two layer coating system according to claim 12, wherein the overcoat layer comprises a polyvinyl chloride (PVC) resin.

### Claim 14 (depends on 12)

The two layer coating system according to claim 12, wherein the overcoat layer comprises a functionalised polyvinyl chloride resin.

### Claim 15 (depends on 12)

A food and/or beverage container coated on at least a portion thereof with the two-layer coating system according to claim 12.

### Claim 16 (depends on 7)

The coating composition of claim 7, wherein the glass transition temperature (Tg) of the second polyester material is from about 80° C. to 150° C.