# US 2020/0399463 A1 · Polyester packaging material

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- Number: US 2020/0399463 A1
- Document ID: US20200399463A1
- Status: Published application
- Kind: A1
- Application number: 16/957,275
- Filed: 2018-12-27
- Published: 2020-12-24
- Earliest claimed: 2017-12-29
- Assignees: Penn Color, Inc.
- Applicants: Penn Color, Inc.
- Inventors: Kelan Wieloch; Venumadhava S. Eleswarapu; Scott Stamback; James C. Walsh; Fred Biemuller
- Web page: https://patentgrep.com/patent/US20200399463A1

## CPC

- C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- B65D 65/20: with provision for excluding light of a particular wavelength
- B65D 81/30: by excluding light or other outside radiation (wrappers B65D65/16)
- C08J 5/18: Manufacture of films or sheets
- C08L 67/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence)
- B32B 27/36: comprising polyesters
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2439/70: Food packaging
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08J 2367/04: Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2367/06 takes precedence)
- C08J 2423/20: having four to nine carbon atoms
- C08K 3/22: of metals
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08K 3/34: Silicon-containing compounds
- C08K 2003/2241: {Titanium dioxide}
- C08K 2003/2265: {of iron}
- C08K 2003/3036: {of zinc}
- C08K 2003/3045: {Sulfates}
- C08L 2203/16: used for films
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

White goniochromatic packaging article. The package wall containing a composition useful for blocking light in the spectrum ranges from about 200 nm to about 1200 nm. The composition has polyester, polymethylpentene, and a light scattering pigment. The composition optionally includes at least one other colorant. Each of the polymethylpentene and the light scattering pigment comprise about 0.1 to about 0.5 weight percent of the wall. The polyester and polymethylpentene are immiscible and when subjected to orientation stresses the composition produces a goniochromatic packaging article.

## Claims

### Claim at position 1

1-20. (canceled)

### Claim 21

A packaging article comprising a wall, wherein the wall comprises:
a polyester;
about 0.2 to about 4.0 weight percent polymethylpentene (PMP); and
about 0.1 to about 5.0 weight percent light scattering pigment,
wherein the ratio of PMP to light scattering pigment in the layer is from about 5:1 to about 1:5, and wherein the wall is goniochromatic.

### Claim 22 (depends on 21)

The packaging article of claim 21, wherein the wall has a gonioappearance of less than 10 units, measured as DECMC with a 45° incident light source between 15° near-specular reflection and 110° far specular reflection.

### Claim 23 (depends on 21)

The packaging article of claim 21, wherein the polyester is selected from polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polylactic acid (PLA), poly trimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polyethlene furanoate (PEF), polycyclohexylene dimethylene terephthalate (PCT), sulfonated polyesters, polycaprolactone (PCL), polyhydroxyalkanoate (PHA), and copolymers and combinations thereof.

### Claim 24 (depends on 21)

The packaging article of claim 21, wherein the polyester is PET.

### Claim 25 (depends on 21)

The packaging article of claim 21, wherein the light scattering pigment is selected from titanium dioxide (TiO2), metal oxide particles, barium sulfate (BaSO4), and zinc sulfide (ZnS).

### Claim 26 (depends on 25)

The packaging article of claim 25, wherein the light scattering pigment is titanium dioxide (TiO2).

### Claim 27 (depends on 21)

The packaging article of claim 21, wherein the wall has a light barrier, for light with wavelengths ranging from about 400 nm to about 700 nm, of greater than about 90%.

### Claim 28 (depends on 21)

The packaging article of claim 21, wherein the wall has an L* value according to CIELAB color space of greater than about 75.

### Claim 29 (depends on 21)

The packaging article of claim 21, wherein the wall is a mono-layer container wall.

### Claim 30 (depends on 21)

The packaging article of claim 21, wherein the wall is an outer wall of the packaging article.

### Claim 31 (depends on 21)

The packaging article of claim 21, wherein the layer further comprises a second pigment or colorant.

### Claim 32 (depends on 31)

The packaging article of claim 31, wherein the second pigment or colorant comprises a dye, a thermochromic pigment, a fluorescent pigment, a pearlescent pigment, a metallic pigment, or a combination thereof.

### Claim 33 (depends on 21)

The packaging article of claim 21, wherein the polyester comprises polyethylene terephthalate (PET), the wall has an L*-value, according to the CIELAB color scale, of greater than 75, and the wall has a light barrier, for light with wavelengths ranging from 400 nm to 700 nm, of greater than 90 percent.

### Claim 34 (depends on 21)

The packaging article of claim 21, wherein the polyester is polyethylene terephthalate (PET), the PMP in the layer is present in an amount of about 0.2 to about 3.0 weight percent, the light scattering pigment in the layer is titanium dioxide present in an amount of about 0.2 to about 4.0 weight percent, and the ratio of PMP to titanium dioxide in the layer is about 3:1 to about 1:3.

### Claim 35 (depends on 34)

The packaging article of claim 34, wherein the wall has an L*-value, according to the CIELAB color space, of greater than 80, and the wall has a light barrier, for light with wavelengths ranging from 400 nm to 700 nm, of greater than 98%.

### Claim 36 (depends on 21)

The packaging article of claim 21, further comprising a bottom connected to the wall, wherein the bottom and the wall at least partially define an interior space.

### Claim 37

A method of producing a wall of a packaging article, the method comprising:
obtaining a composition comprising a mixture of a polyester, polymethylpentene (PMP), and a light scattering pigment, wherein the PMP comprises about 0.2 to about 4.0 weight percent of the mixture, the light scattering pigment comprises about 0.1 to about 5.0 weight percent of the mixture, and the ratio of PMP to light scattering pigment in the mixture is about 5:1 to about 1:5; and
subjecting the composition to an orientation stress to produce the wall of the packaging article, wherein the wall is goniochromatic.

### Claim 38 (depends on 37)

The method of claim 37, wherein the density of the composition prior to being subjected to the orientation stress is equal to or lower than the density of the polyester.

### Claim 39 (depends on 37)

The method of claim 37, wherein the density of the wall after being subjected to the orientation stress is equal to or lower than the density of the polyester.

### Claim 40 (depends on 37)

The method of claim 37, wherein the orientation stress is selected from: blow molding, uniaxial or biaxial sheet orientation, thermoforming, and fiber spinning.