# US 10,767,041 B2 · Polymer compositions and substrates for high temperature transparent conductive film applications

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- Number: US 10,767,041 B2
- Document ID: US10767041B2
- Status: Granted
- Kind: B2
- Application number: 15/285,767
- Filed: 2016-10-05
- Published: 2017-07-06
- Granted: 2020-09-08
- Earliest claimed: 2015-11-24
- Assignees: Eastman Chemical Company
- Applicants: Eastman Chemical Company
- Inventors: Wayne Ken Shih
- Web page: https://patentgrep.com/patent/US10767041B2

## CPC

- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- B29C 48/001: {Combinations of extrusion moulding with other shaping operations}
- B29C 48/022: {characterised by the choice of material}
- B29C 55/02: of plates or sheets
- C08J 5/18: Manufacture of films or sheets
- B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material
- B29L 2007/00: Flat articles, e.g. films or sheets (B29L2024/00 takes precedence)
- 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 2203/20: use in electrical or conductive gadgets
- C08L 2203/204: use in solar cells
- 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: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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)
- 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)
- 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

## Abstract

Described are polymer compositions that include a blend of copolyester polymers based on monomers that include on terephthalic acid (TPA), isophthalic acid (IPA) and 1,4-cyclohexanedimethanol (CHDM), wherein the blend includes a first copolyester that is semi-crystalline and a second copolyester that is amorphous; and films made from the polymer compositions useful for transparent high temperature conductive film applications.

## Claims

### Claim 1

A polymer composition comprising a blend of a first PCTA copolyester and a second PCTA copolyester,
said first PCTA copolyester comprising:
(a) diacid residues comprising from about 90 to about 99 mole percent of terephthalic acid (TPA) residues and from about 1 to about 10 mole percent isophthalic acid (IPA) residues; and
(b) diol residues comprising at least 85 mole percent of 1,4-cyclohexanedimethanol (CHDM) residues, wherein the first PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
said second PCTA copolyester comprising:
(a) diacid residues comprising from 70 to 80 mole percent of TPA residues and from 20 to 30 mole percent IPA residues; and
(b) diol residues of 100 mole percent of CHDM residues, wherein the second PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
wherein the first PCTA copolyester is semi-crystalline;
wherein the second PCTA copolyester is amorphous; and
wherein the blend comprises diacid residues comprising from about 5 to about 20 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues.

### Claim 2 (depends on 1)

The polymer composition according to claim 1, wherein the first PCTA copolyester comprises diacid residues comprising from 3 to 7 mole percent IPA residues.

### Claim 3 (depends on 1)

The polymer composition according to claim 1, wherein the first PCTA copolyester and second PCTA copolyester each comprise diol residues comprising 100 mole percent CHDM residues.

### Claim 4 (depends on 1)

The polymer composition according to claim 1, wherein the first PCTA copolyester has a degree of crystallinity of about 40% or greater.

### Claim 5 (depends on 1)

The polymer composition according to claim 1, wherein the second PCTA copolyester is capable of being crystallized by heating or stretching.

### Claim 6 (depends on 1)

The polymer composition according to claim 1, wherein the blend comprises diacid residues comprising from about 7 to about 12 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues.

### Claim 7 (depends on 1)

The polymer composition according to claim 1, wherein the blend comprises the first PCTA polyester in an amount from about 70 to about 80 wt % and the second PCTA polyester in an amount from about 20 to about 30 wt %.

### Claim 8 (depends on 1)

The polymer composition according to claim 1, wherein the blend comprises less than 2 wt % of any additional additives.

### Claim 9 (depends on 1)

The polymer composition according to claim 1, wherein the blend has a Tg of at least 85° C., and a Tm of at least 255° C.

### Claim 10

A polyester film comprising a melt formed polyester blend, wherein said polyester blend comprises a first PCTA copolyester and a second PCTA copolyester,
said first PCTA copolyester comprising:
(a) diacid residues comprising from about 90 to about 99 mole percent of terephthalic acid (TPA) residues and from about 1 to about 10 mole percent isophthalic acid (IPA) residues; and
(b) diol residues of 100 mole percent of 1,4-cyclohexanedimethanol (CHDM) residues, wherein the first PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
said second PCTA copolyester comprising:
(a) diacid residues comprising from 70 to 80 mole percent of TPA residues and from 20 to 30 mole percent IPA residues; and
(b) diol residues of 100 mole percent of CHDM residues, wherein the second PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
wherein the first PCTA copolyester is semi-crystalline;
wherein the second PCTA copolyester is amorphous;
wherein said blend comprises diacid residues comprising from about 5 to about 20 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues; and
wherein the film has a thickness in the range from about 25 to about 250 microns.

### Claim 11 (depends on 10)

The polyester film according to claim 10, wherein the film has an IV greater than 0.7 dL/g.

### Claim 12 (depends on 10)

The polyester film according to claim 10, wherein said polyester film is biaxially oriented and has a haze of less than 1%.

### Claim 13 (depends on 12)

The polyester film according to claim 12, wherein the polyester film is capable of being annealed at a temperature of 150° C. for 90 minutes and maintaining a haze of less than 1%.

### Claim 14 (depends on 10)

The polyester film according to claim 10, further comprising an ITO coating and having a sheet resistance of less than about 100Ω/□.

### Claim 15

A method of making a biaxially oriented polyester film, said method comprising blending a first PCTA copolyester and a second PCTA copolyester; forming a melt processable polymer composition from the blend; melt forming the melt processable polymer composition to form a sheet; and biaxially stretching the sheet to form a film, wherein said polyester blend comprises a first PCTA copolyester and a second PCTA copolyester,
said first PCTA copolyester comprising:
(a) diacid residues comprising from about 90 to about 99 mole percent of terephthalic acid (TPA) residues and from about 1 to about 10 mole percent isophthalic acid (IPA) residues; and
(b) diol residues comprising at least 85 mole percent of 1,4-cyclohexanedimethanol (CHDM) residues, wherein the first PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
said second PCTA copolyester comprising:
(a) diacid residues comprising from 70 to 80 mole percent of TPA residues and from 20 to 30 mole percent IPA residues; and
(b) diol residues of 100 mole percent of CHDM residues, wherein the second PCTA copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues;
wherein the first PCTA copolyester is semi-crystalline;
wherein the second PCTA copolyester is amorphous;
wherein said blend comprises diacid residues comprising from about 5 to about 20 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues.

### Claim 16 (depends on 15)

The method according to claim 15, wherein the blend comprises diacid residues comprising from about 7 to about 12 net mole percent of IPA residues, wherein the blend comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues.

### Claim 17 (depends on 15)

The method according to claim 15, wherein the melt forming step comprises extruding the blend at a temperature at or below 580° F. (304° C.) using an extruder, and wherein the motor load on the extruder is lower for the blend compared to extruding only the first PCTA polymer under similar conditions.

### Claim 18 (depends on 15)

The method according to claim 15, wherein the polyester film has a haze of less than 1%.

### Claim 19 (depends on 18)

The method according to claim 18, wherein the polyester film is capable of being annealed at a temperature of 150° C. for 90 minutes and maintaining a haze of less than 1%.