# US 2021/0332199 A1 · Polyester film having laminated structure and method for manufacturing the same

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- Number: US 2021/0332199 A1
- Document ID: US20210332199A1
- Status: Published application
- Kind: A1
- Application number: 17/197,041
- Filed: 2021-03-10
- Published: 2021-10-28
- Earliest claimed: 2020-04-28
- Assignees: Nan Ya Plastics Corporation
- Applicants: Nan Ya Plastics Corporation
- Inventors: TE-CHAO LIAO; Wen-Cheng Yang; CHUN-CHENG YANG; Chia-Yen Hsiao; CHING-YAO YUAN
- Web page: https://patentgrep.com/patent/US20210332199A1

## CPC

- C08J 5/18: Manufacture of films or sheets
- B29B 17/0042: {for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic}
- B29C 48/08: flexible, e.g. films
- B29C 48/17: the components having different colours
- B29C 48/21: the layers being joined at their surfaces
- B29D 7/01: Films or sheets
- B32B 7/02: Physical, chemical or physicochemical properties
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/36: comprising polyesters
- C08J 11/04: of polymers
- C08J 11/06: without chemical reactions
- C08J 11/10: by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation (depolymerisation to the original monomer C07)
- C08J 11/18: by treatment with organic material
- C08J 11/24: containing hydroxyl groups
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- B29B 17/0412: {to large particles, e.g. beads, granules, flakes, slices}
- B29B 2017/042: {Mixing disintegrated particles or powders with other materials, e.g. with virgin materials}
- B29B 2017/0476: {Cutting or tearing members, e.g. spiked or toothed cylinders or intermeshing rollers}
- B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material
- B29K 2067/003: {PET, i.e. poylethylene terephthalate}
- B29K 2105/0032: {Pigments, colouring agents or opacifiyng agents}
- B29K 2995/002: Coloured
- B29L 2007/008: {Wide strips, e.g. films, webs}
- B29L 2009/00: Layered products
- B29L 2031/7158: {Bottles}
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2250/244: All polymers belonging to those covered by group B32B27/36
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2264/102: Oxide or hydroxide
- B32B 2264/1022: Titania
- B32B 2264/104: Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
- B32B 2264/108: Carbon, e.g. graphite particles
- B32B 2272/00: Resin or rubber layer comprising scrap, waste or recycling material
- B32B 2307/202: Conductive
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08J 2467/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08J2467/06 takes precedence)
- 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
- Y02P 20/143: the feedstock being recycled material, e.g. plastics
- Y02W 30/52: Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
- Y02W 30/62: Plastics recycling; Rubber recycling
- 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)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

A polyester film having a laminated structure and a method for manufacturing the same are provided. The polyester film has at least two polyester film layers. Each of the polyester film layers includes a physically recycled polyester resin and a chemically recycled polyester resin. The physically recycled polyester resin is formed by a plurality of physically recycled polyester chips. The chemically recycled polyester resin is formed by a plurality of chemically recycled polyester chips, and is mixed with the physically recycled polyester resin. The plurality of chemically recycled polyester chips further includes chemically recycled electrostatic pinning polyester chips. The chemically recycled electrostatic pinning polyester chips contain electrostatic pinning additives, and the electrostatic pinning additives are metal salts. The at least two polyester film layers are a white polyester film layer and a black polyester film layer, respectively.

## Claims

### Claim 1

A method for manufacturing a polyester film, wherein the polyester film thus obtained has a laminated structure, and at least two polyester film layers stacked upon each other are provided in the polyester film having the laminated structure; wherein the method is characterized in that each of the polyester film layers is produced through recycling and reusing a recycled polyester material, and the method for manufacturing each of the polyester film layers comprises:
physically reproducing a part of the recycled polyester material and granulating the same to obtain a plurality of physically recycled polyester chips;
chemically reproducing another part of the recycled polyester material and granulating the same to obtain a plurality of chemically recycled polyester chips, wherein the plurality of chemically recycled polyester chips further includes chemically recycled electrostatic pinning polyester chips, and wherein the chemically recycled electrostatic pinning polyester chips contain at least one kind of electrostatic pinning additives, and the electrostatic pinning additives are metal salts; and
mixing and melting the plurality of physically recycled polyester chips and the plurality of chemically recycled polyester chips to form the polyester film layer;
wherein, based on 100 parts by weight of a total content of the polyester chips, a content of the chemically recycled electrostatic pinning polyester chips of the plurality of chemically recycled polyester chips is between 5 and 35 parts by weight;
wherein the at least two polyester film layers are a white polyester film layer and a black polyester film layer, respectively, and wherein the white polyester film layer further includes a white additive, and the black polyester film layer further includes a black additive.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the polyester film having the laminated structure is formed by coextruding the at least two polyester film layers.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the polyester film having the laminated structure is formed by having one of the polyester film layers coated onto another one of the polyester film layers.

### Claim 4 (depends on 1)

The method according to claim 1, wherein in the white polyester film layer, the white additive is at least one selected from a material group consisting of titanium dioxide (TiO2) particles, barium sulfate (BaSO4) particles, and calcium carbonate (CaCO3) particles; wherein a particle size of the white additive is between 0.1 and 20 micrometers, and a content of the white additive in the white polyester film layer is between 0.05% and 35% by weight.

### Claim 5 (depends on 1)

The method according to claim 1, wherein in the black polyester film layer, the black additive is at least one selected from a material group consisting of carbon black powder, graphite powder, nano carbon black, carbon nanotubes, and graphene; wherein a particle size of the black additive is between 0.01 and 10 micrometers, and a content of the black additive in the black polyester film layer is between 1% and 40% by weight.

### Claim 6 (depends on 1)

The method according to claim 1, wherein in each of the polyester film layers, the plurality of physically recycled polyester chips form a physically recycled polyester resin, and the plurality of chemically recycled polyester chips form a chemically recycled polyester resin that is mixed with the physically recycled polyester resin; wherein, based on 100 parts by weight of the total content of the polyester chips, a content of the plurality of physically recycled polyester chips is between 50 and 95 parts by weight, a content of the plurality of chemically recycled polyester chips is between 1 and 40 parts by weight, and a total content of the plurality of physically recycled polyester chips and the plurality of chemically recycled polyester chips is between 55 and 100 parts by weight.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the step of chemically reproducing another part of the recycled polyester material further includes: depolymerizing the recycled polyester material to obtain a raw material mixture, and then repolymerizing and granulating the raw material mixture to obtain the plurality of chemically recycled polyester chips.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the step of repolymerizing the raw material mixture further includes: adding the electrostatic pinning additives to a part of the raw material mixture, and then repolymerizing the raw material mixture that is added with the electrostatic pinning additives and granulating the same, thereby obtaining the chemically recycled electrostatic pinning polyester chips.

### Claim 9 (depends on 8)

The method according to claim 8, wherein in each of the polyester film layers, a content of the electrostatic pinning additives in the chemically recycled electrostatic pinning polyester chips is between 0.01% and 0.3% by weight, so that a content of the electrostatic pinning additives in the polyester film layer is between 0.005% and 0.1% by weight.

### Claim 10 (depends on 7)

The method according to claim 7, wherein the step of repolymerizing the raw material mixture further includes: adding a slipping agent to a part of the raw material mixture, and then repolymerizing the raw material mixture that is added with the slipping agent and granulating the same to obtain chemically recycled slipping polyester chips; wherein the slipping agent is at least one selected from a material group consisting of silicon dioxide particles, calcium carbonate particles, barium sulfate particles, polystyrene particles, silica gel particles, and acrylic particles; wherein, based on 100 parts by weight of the total content of the polyester chips, a content of the chemically recycled slipping polyester chips is between 5 and 10 parts by weight.

### Claim 11 (depends on 10)

The method according to claim 10, wherein in each of the polyester film layers, a particle size of the slipping agent is less than 2 micrometers;
wherein a content of the slipping agent in the chemically recycled slipping polyester chips is between 0.1% and 20% by weight, so that a content of the slipping agent in the polyester film layer is between 0.01% and 2% by weight.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the plurality of physically recycled polyester chips and the plurality of chemically recycled polyester chips are both obtained through recycling, reusing, and granulation of the recycled polyester material; wherein the recycled polyester material is recycled PET (r-PET) bottle chips.

### Claim 13 (depends on 12)

The method according to claim 12, wherein a polyester component of the recycled PET bottle chips includes isophthalic acid (IPA) serving as a dibasic acid unit, so that the polyester film that is finally formed also contains the isophthalic acid; wherein, expressed in mole percent based on a total weight of the polyester film, a content of the isophthalic acid in the polyester film is between 0.5 mol % and 5 mol %.

### Claim 14 (depends on 12)

The method according to claim 12, wherein a polyester component of the recycled PET bottle chips includes biomass-derived ethylene glycol serving as a diol unit, so that the polyester film that is finally formed also contains the biomass-derived ethylene glycol; wherein, expressed in percent by weight based on the total weight of the polyester film, a content of the biomass-derived ethylene glycol in the polyester film is between 1% and 25% by weight; wherein a content of carbon derived from the biomass as measured by carbon-14 dating is not greater than 5% based on a total carbon content of the polyester film.

### Claim 15

A polyester film having a laminated structure, comprising:
at least two polyester film layers stacked upon each other, wherein each of the polyester film layers is produced through recycling and reusing a recycled polyester material and includes:
a physically recycled polyester resin formed by a plurality of physically recycled polyester chips; and
a chemically recycled polyester resin formed by a plurality of chemically recycled polyester chips and mixed with the physically recycled polyester resin, wherein the plurality of chemically recycled polyester chips further includes chemically recycled electrostatic pinning polyester chips, and wherein the chemically recycled electrostatic pinning polyester chips contain at least one kind of electrostatic pinning additives, and the electrostatic pinning additives are metal salts;
wherein, expressed in percent by weight based on a total weight of the polyester film layer, a content of the electrostatic pinning additives in the polyester film layer is between 0.005% and 0.1% by weight;
wherein the at least two polyester film layers are a white polyester film layer and a black polyester film layer, respectively, and wherein the white polyester film layer further includes a white additive, and the black polyester film layer further includes a black additive.

### Claim 16 (depends on 15)

The polyester film according to claim 15, wherein in the white polyester film layer, the white additive is at least one selected from a material group consisting of titanium dioxide (TiO2) particles, barium sulfate (BaSO4) particles, and calcium carbonate (CaCO3) particles; wherein a particle size of the white additive is between 0.1 and 20 micrometers, and a content of the white additive in the white polyester film layer is between 0.05% and 35% by weight.

### Claim 17 (depends on 15)

The polyester film according to claim 15, wherein in the black polyester film layer, the black additive is at least one selected from a material group consisting of carbon black powder, graphite powder, nano carbon black, carbon nanotubes, and graphene; wherein a particle size of the black additive is between 0.01 and 10 micrometers, and a content of the black additive in the black polyester film layer is between 1% and 40% by weight.

### Claim 18 (depends on 15)

The polyester film according to claim 15, wherein a quantity of film layers for the polyester film layers of the polyester film having the laminated structure is two, and the polyester film layers are stacked upon each other in a sequence of white and then black or black and then white; wherein, alternatively, a quantity of film layers for the polyester film layers of the polyester film having the laminated structure is three, and the polyester film layers are stacked upon each other in a sequence of white, black and then white, or black, white and then black.