# US 12,110,200 B2 · Biaxially oriented polyester film roll

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- Number: US 12,110,200 B2
- Document ID: US12110200B2
- Status: Granted
- Kind: B2
- Application number: 17/285,777
- Filed: 2019-10-25
- Published: 2021-11-04
- Granted: 2024-10-08
- Earliest claimed: 2018-10-30
- Assignees: Toyobo Co., Ltd.
- Applicants: Toyobo Co., Ltd.
- Inventors: Nobuyuki Manabe; Masayuki Haruta
- Web page: https://patentgrep.com/patent/US12110200B2

## CPC

- B65H 18/28: Wound package of webs
- C08J 5/18: Manufacture of films or sheets
- B29C 48/0018: {combined with shaping by orienting, stretching or shrinking, e.g. film blowing (B29C48/0017 takes precedence)}
- B29C 48/08: flexible, e.g. films
- B29C 48/28: Storing of extruded material, e.g. by winding up or stacking
- B29K 2067/003: {PET, i.e. poylethylene terephthalate}
- B65H 2701/1752: Polymer film
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08K 3/36: Silica
- B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- 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)
- 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)
- 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
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Provided is a polyester film roll which has less wrinkles and film surface defects, exhibits no deviation of winding, and is suitable for secondary processing such as coating and vapor deposition. The polyester film roll is obtained by winding a biaxially oriented polyester film around a core, and is characterized by satisfying requirements (1)-(3) below: (1) the average winding hardness of the surface of the polyester film roll is in the range of 500-700; (2) the variation rate of the winding hardness of the surface of the polyester film roll in the film width direction is 1-5%; and (3) the variation rate of the average winding hardness from the surface of the polyester film roll to the core is 3-10%.

## Claims

### Claim 1

A polyester film roll obtained by winding a biaxially oriented polyester film around a core, wherein
the biaxially oriented polyester film consists of polyethylene terephthalate and particles formed of silica,
the content of the silica in the biaxially oriented polyester film is 100 ppm by weight or more and 20,000 ppm by weight or less,
the weight average particle size of the silica measured by a Coulter counter is 0.05 μm to 3.0 μm,
the biaxially oriented polyester film has a thickness of 5 μm or more and 40 μm or less,
an average winding hardness on a surface of the polyester film roll is in a range of 500 or more and 700 or less,
a variation rate of a winding hardness on a surface of the polyester film roll in a film transverse direction is 1% or more and 5% or less,
a variation rate of an average winding hardness from a surface of the polyester film roll to the core is 3% or more and 10% or less,
static friction coefficient on each of a winding outer surface and a winding inner surface of the biaxially oriented polyester film is 0.2 or more and 0.60 or less, and
arithmetic mean height on a winding inner surface of the biaxially oriented polyester film is 0.010 μm or more and 0.050 μm or less.

### Claim 2 (depends on 1)

The polyester film roll according to claim 1, wherein a thickness unevenness rate of the biaxially oriented polyester film in a transverse direction is 10% or less.

### Claim 3 (depends on 2)

The polyester film roll according to claim 2, wherein dynamic friction coefficients on a winding outer surface and a winding inner surface of the biaxially oriented polyester film are both 0.2 or more and 0.60 or less.

### Claim 4 (depends on 3)

The polyester film roll according to claim 3, wherein a winding length of the biaxially oriented polyester film is 2000 m or more and 65000 m or less.

### Claim 5 (depends on 4)

The polyester film roll according to claim 4, wherein a width of the polyester film roll is 400 mm or more and 3000 mm or less.

### Claim 6 (depends on 5)

The polyester film roll according to claim 5, wherein the biaxially oriented polyester film is for a vapor-deposited film base material.

### Claim 7 (depends on 1)

The polyester film roll according to claim 1, wherein a winding length of the biaxially oriented polyester film is 2000 m or more and 65000 m or less.

### Claim 8 (depends on 1)

The polyester film roll according to claim 1, wherein a width of the polyester film roll is 400 mm or more and 3000 mm or less.

### Claim 9 (depends on 1)

The polyester film roll according to claim 1, wherein the biaxially oriented polyester film is for a vapor-deposited film base material.