# US 10,870,738 B2 · Polyester sheet

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- Number: US 10,870,738 B2
- Document ID: US10870738B2
- Status: Granted
- Kind: B2
- Application number: 16/466,279
- Filed: 2017-12-13
- Published: 2020-03-05
- Granted: 2020-12-22
- Earliest claimed: 2016-12-27
- Assignees: Mitsui Chemicals, Inc.
- Applicants: Mitsui Chemicals, Inc.
- Inventors: Masakazu Tanaka; Toyoaki Sasaki; Yasuhito Tsugane; Kenkichi Yoshida; Kenjiro Takamine; Masahiko Okamoto; Takanori Tada
- Web page: https://patentgrep.com/patent/US10870738B2

## CPC

- C08J 5/18: Manufacture of films or sheets
- B29C 55/12: biaxial
- C08F 10/14: Monomers containing five or more carbon atoms
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- B29C 55/143: {firstly parallel to the direction of feed and then transversely thereto}
- B29C 55/16: simultaneously
- C08F 210/14: Monomers containing five or more carbon atoms
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08J 2423/20: having four to nine carbon atoms
- C08J 2453/02: of vinyl aromatic monomers and conjugated dienes
- C08J 2455/00: Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2423/00 - C08J2453/00
- C08L 2203/20: use in electrical or conductive gadgets
- C08L 2203/204: use in solar cells
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/08: containing additives to improve the compatibility between two polymers
- F21V 7/24: characterised by the material
- G02B 5/08: Mirrors {(vehicle mirrors involving special optical features B60R1/08)}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/133605: {including specially adapted reflectors}
- H10F 77/48: Back surface reflectors [BSR]
- Y02E 10/52: PV systems with concentrators
- 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)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A polyester sheet including a polyester (A), a 4-methyl-1-pentene polymer (B) having a specific heat of fusion and a meso diad fraction (m) of 98.5 to 100%, and a compatibilizing agent (C), wherein content proportions of the (A), (B), and (C) are 60 to 98.9 parts by mass for (A), 1 to 25 parts by mass for (B), and 0.1 to 15 parts by mass for (C), when a total content of (A), (B), and (C) is set as 100 parts by mass, and wherein (B) satisfies the requirements (a) to (d) described herein.

## Claims

### Claim 1

A polyester sheet comprising a polyester (A), a 4-methyl-1-pentene polymer (B), and a compatibilizing agent (C), wherein content proportions of the (A), (B), and (C) are 60 to 98.9 parts by mass for (A), 1 to 25 parts by mass for (B), and 0.1 to 15 parts by mass for (C), when a total content of (A), (B), and (C) is set as 100 parts by mass, and wherein the (B) satisfies the following requirements (a) to (d):
(a) an amount of a constitutional unit derived from 4-methyl-1-pentene is 100 to 90% by mol and a total amount of constitutional units derived from at least one α-olefin selected from ethylene and α-olefins having 3 to 20 carbon atoms (except for 4-methyl-1-pentene) is 0 to 10% by mol;
(b) a heat of fusion ΔHm (units: J/g) and a melting point Tm (units: ° C.) measured by differential scanning calorimetry (DSC) satisfy the following requirements (1) and (2):
ΔHm≥0.5×Tm−76 (1)
Melting point Tm: 200 to 260° C.; (2)
(c) a melt flow rate (MFR) measured under conditions of 260° C. and a 5 kg load in conformity to ASTM D1238 is 0.1 to 500 g/10 min; and
(d) a meso diad fraction (m) measured by 13C-NMR is 98.5 to 100%.

### Claim 2 (depends on 1)

The polyester sheet according to claim 1, wherein the (B) satisfies at least one of the following requirements (e) and (f):
(e) a Vicat softening temperature measured at a rate of temperature increase of 50° C./hr at a test load of 10 N in a silicone oil in conformity to ASTM D1525 is 145 to 220° C.; and
(f) an amount of a decane-soluble portion at 23° C. is 5% by weight or less.

### Claim 3 (depends on 1)

The polyester sheet according to claim 1, wherein the 4-methyl-1-pentene polymer (B) has a melting point Tm of 230 to 245° C.

### Claim 4 (depends on 1)

The polyester sheet according to claim 1, wherein the polyester (A) is polyethylene terephthalate.

### Claim 5 (depends on 1)

The polyester sheet according to claim 1, wherein the polyester sheet is obtained through a stretching process.

### Claim 6 (depends on 1)

The polyester sheet according to claim 1, wherein the (C) is a polar group-modified styrene elastomer.

### Claim 7 (depends on 6)

The polyester sheet according to claim 6, wherein the polar group-modified styrene elastomer is a polar group-modified styrene-ethylene/butylene-styrene copolymer.

### Claim 8 (depends on 6)

The polyester sheet according to claim 6, wherein the polar group-modified styrene elastomer has a styrene content falling within the range of 5 to 20% by mass.

### Claim 9 (depends on 1)

The polyester sheet according to claim 1, wherein the polyester sheet is a biaxially stretched sheet.

### Claim 10 (depends on 1)

The polyester sheet according to claim 1, wherein the polyester sheet is a reflective sheet of a liquid crystal display, an illuminated sign, or a solar cell.