# US 2022/0274751 A1 · Packaging film

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2022/0274751 A1
- Document ID: US20220274751A1
- Status: Published application
- Kind: A1
- Application number: 17/632,982
- Filed: 2020-08-05
- Published: 2022-09-01
- Earliest claimed: 2019-08-06
- Assignees: Novamont S.p.A.
- Applicants: Novamont S.P.A.
- Inventors: Catia BASTIOLI; Sebastià GESTI' GARCIA
- Web page: https://patentgrep.com/patent/US20220274751A1

## CPC

- B32B 23/08: of synthetic resin
- B65D 65/42: Applications of coated or impregnated materials
- B32B 27/08: of synthetic resin
- B32B 27/16: specially treated, e.g. irradiated
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/22: using plasticisers
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/36: comprising polyesters
- B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)}
- B65D 65/466: {Bio- or photodegradable packaging materials}
- C08J 5/18: Manufacture of films or sheets
- C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)}
- C08J 7/048: Forming gas barrier coatings
- C08L 67/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence)
- C09D 103/02: Starch; Degradation products thereof, e.g. dextrin
- B32B 2250/02: 2 layers
- B32B 2250/24: All layers being polymeric
- B32B 2250/244: All polymers belonging to those covered by group B32B27/36
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/20: Inorganic coating
- B32B 2255/205: Metallic coating
- B32B 2255/26: Polymeric coating
- B32B 2255/28: Multiple coating on one surface
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/40: having particular optical properties
- B32B 2307/414: Translucent
- B32B 2307/538: Roughness
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/7163: Biodegradable
- B32B 2307/7244: Oxygen barrier
- B32B 2307/7246: Water vapor barrier
- B32B 2307/7265: Non-permeable
- 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 2403/02: Starch; Degradation products thereof, e.g. dextrin
- C08J 2425/14: with unsaturated esters
- C08J 2429/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2467/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08J2467/06 takes precedence)
- C08L 2201/06: Biodegradable
- C08L 2203/16: used for films
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2310/00: Masterbatches
- C08L 2312/00: Crosslinking
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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

The present invention relates to a film comprising at least one biodegradable layer (i) having an elastic modulus of more than 450 MPa, consisting of a mixture of polyhydroxyalkanoate constituting the continuous phase and aliphatic and/or aliphatic-aromatic polyester constituting the discontinuous phase, and at least one coating layer (ii) preferably capable of having barrier effects against gases and liquids. The surface of said layer (i) will have a root mean square roughness Sq of more than 10 nm and less than 45 nm, measured by atomic force microscopy (AFM). The film is particularly suitable for use in food packaging.

## Claims

### Claim 1

A barrier film comprising at least one biodegradable layer (i) having an elastic modulus higher than 450 MPa, consisting of a mixture comprising a polyhydroxyalkanoate constituting the continuous phase and an aliphatic and/or aliphatic-aromatic polyester constituting the discontinuous phase, the said mixture further comprising from 0.01 to 5% wt. of a crosslinking agent and/or a chain extending agent having two or multiple functional groups, and at least one coating layer (ii), where the surface of layer (i) is characterised by a root mean square roughness Sq of more than 10 nm and less than 45 nm, measured by atomic force microscopy (AFM).

### Claim 2 (depends on 1)

The barrier film according to claim 1, in which the said mixture comprises from 0.01 to 0.45% wt. of a crosslinking agent and/or a chain extending agent having two or multiple functional groups.

### Claim 3 (depends on 1)

The barrier film according to claim 1 in which the said crosslinking agent and/or chain extending agent is selected from compounds having two or multiple functional groups including isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxy, anhydride or divinyl ether groups and mixtures of these.

### Claim 4 (depends on 1)

The barrier film according to claim 1 in which layer (i) has elongation at break (εb) values of 150% or above and below 400% measured according to ASTM D882 (23° C., 50% relative humidity at Vo 50 mm/min).

### Claim 5 (depends on 1)

The barrier film according to claim 1, in which said polyhydroxyalkanoate layer (i) is selected from the group consisting of: lactic acid, polyhydroxybutyrate, polyhydroxybutyrate-valerate, polyhydroxybutyrate-propanoate, polyhydroxybutyrate-hexanoate, polyhydroxybutyrate-decanoate, polyhydroxybutyrate-dodecanoate, polyhydroxybutyrate-hexadecanoate, polyhydroxybutyrate-octadecanoate, poly-3-hydroxybutyrate-4-hydroxybutyrate polyesters and mixtures thereof.

### Claim 6 (depends on 5)

The barrier film according to claim 5, in which said polyhydroxyalkanoate comprises at least 70% by weight of one or more polyesters of lactic acid.

### Claim 7 (depends on 1)

The barrier film according to claim 1, in which said aliphatic and/or aliphatic-aromatic polyester layer (i) is selected from the group consisting of poly(1,4-butylene succinate), poly(1,4-butylene succinate-co-adipate), poly(1,4-butylene succinato-co-1,4-butylene azelate), poly(1,4 butylene adipate-co-1,4-butylene terephthalate), poly(1,4-butylene succinate-co-1,4-butylene terephthalate), poly(1,4-butylene azelate-co-1,4-butylene terephthalate), poly(1,4-butylene brassylate-co-1,4-butylene terephthalate), poly(1,4-butylene sebacate-co-1,4-butylene terephthalate), poly(1,4-butylene adipate-co-1,4-butylene sebacate-co-1,4-butylene terephthalate), poly(1,4-butylene azelate-co-1,4-butylene sebacate-co-1,4-butylene terephthalate), poly(1,4-butylene adipate-co-1,4-butylene azelate-co-1,4-butylene terephthalate), poly(1,4-butylene succinate-co-1,4-butylene sebacate-co-1,4-butylene terephthalate), poly(1,4-butylene adipate-co-1,4-butylene succinate-co-1,4-butylene terephthalate), poly(1,4-butylene azelate-co-1,4-butylene succinate-co-1,4-butylene terephthalate).

### Claim 8 (depends on 1)

The barrier film according to claim 1, in which said crosslinking agent and/or a chain extending agent having two or multiple functional groups bears peroxide groups and is contained in the film layer (i) in amounts from 0.01 to 0.1% by weight of the total mixture constituting layer (i).

### Claim 9 (depends on 1)

The barrier film according to claim 1, in which said crosslinking agent and/or a chain extending agent having two or multiple functional groups bears epoxy groups and is contained in the film layer (i) in amounts from 0.05 to 0.3% by weight of the total mixture constituting layer (i).

### Claim 10 (depends on 1)

The barrier film according to claim 1, in which said coating layer (ii) is capable of having barrier effects against gases and liquids.

### Claim 11 (depends on 1)

The barrier film according to claim 1, in which said coating layer (ii) comprises a first layer of organic material, which may be natural and/or synthetic, in contact with said layer (i) and a second layer of metal material covering the first.

### Claim 12 (depends on 1)

The barrier film according to claim 1, further including a polymer layer (iii) (multilayer film).

### Claim 13 (depends on 12)

The barrier film according to claim 12, in which said layer (iii) comprises one or more polymers selected from: polyhydroxyalkanoate, aliphatic/aromatic polyester of the diacid-diol type which is the same as or different from those comprised in layer (i), aliphatic polyester, preferably selected from those comprised in layer (i) and having a melting point of 110° C. or below, and mixtures thereof.

### Claim 14 (depends on 1)

Food packaging comprising the barrier film according to claim 1.

### Claim 15

Packaging having a barrier effect comprising a biodegradable film with a modulus of more than 450 MPa, consisting of a mixture comprising a polyhydroxyalkanoate as the continuous phase and at least one aliphatic and/or aliphatic-aromatic polyester as the discontinuous phase.

### Claim 16 (depends on 1)

Packaging comprising a barrier film according to claim 1.

### Claim 17 (depends on 2)

The barrier film according to claim 2 in which the said crosslinking agent and/or chain extending agent is selected from compounds having two or multiple functional groups including isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxy, anhydride or divinyl ether groups and mixtures of these.

### Claim 18 (depends on 2)

The barrier film according to claim 2 in which layer (i) has elongation at break (εb) values of 150% or above and below 400% measured according to ASTM D882 (23° C., 50% relative humidity at Vo 50 mm/min).

### Claim 19 (depends on 3)

The barrier film according to claim 3 in which layer (i) has elongation at break (εb) values of 150% or above and below 400% measured according to ASTM D882 (23° C., 50% relative humidity at Vo 50 mm/min).

### Claim 20 (depends on 2)

The barrier film according to claim 2, in which said polyhydroxyalkanoate layer (i) is selected from the group consisting of: lactic acid, polyhydroxybutyrate, polyhydroxybutyrate-valerate, polyhydroxybutyrate-propanoate, polyhydroxybutyrate-hexanoate, polyhydroxybutyrate-decanoate, polyhydroxybutyrate-dodecanoate, polyhydroxybutyrate-hexadecanoate, polyhydroxybutyrate-octadecanoate, poly-3-hydroxybutyrate-4-hydroxybutyrate polyesters and mixtures thereof.