# US 2010/0167016 A1 · Polyester film for molded part

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- Number: US 2010/0167016 A1
- Document ID: US20100167016A1
- Status: Published application
- Kind: A1
- Application number: 12/278,815
- Filed: 2007-02-15
- Published: 2010-07-01
- Earliest claimed: 2006-02-15
- Assignees: Toray Industries, Inc.
- Inventors: Isao Manabe; Ryosuke Matsui; Masahiro Kimura
- Web page: https://patentgrep.com/patent/US20100167016A1

## CPC

- C08J 5/18: Manufacture of films or sheets
- B29C 45/1418: {the inserts being deformed or preformed, e.g. by the injection pressure}
- B29C 55/143: {firstly parallel to the direction of feed and then transversely thereto}
- B32B 27/08: of synthetic resin
- B32B 27/36: comprising polyesters
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- B29C 55/12: biaxial
- B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material
- B29K 2067/006: {PBT, i.e. polybutylene terephthalate}
- B29K 2105/0088: {Blends of polymers}
- B29L 2031/30: Vehicles, e.g. ships or aircraft, or body parts thereof {(vanes or blades B29L2031/08, air bags B29L2022/027)}
- B29L 2031/3437: {Cellular phones}
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/205: Metallic coating
- B32B 2307/306: Resistant to heat
- B32B 2307/412: Transparent
- B32B 2307/518: bi-axially
- B32B 2307/712: Weather resistant
- B32B 2307/72: Density
- B32B 2307/734: Dimensional stability
- B32B 2419/00: Buildings or parts thereof
- B32B 2451/00: Decorative or ornamental articles
- B32B 2457/00: Electrical equipment
- B32B 2605/00: Vehicles
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08L 2205/02: containing two or more polymers of the same C08L -group
- Y10T 428/24479: including variation in thickness
- Y10T 428/24521: with component conforming to contour of nonplanar surface
- Y10T 428/31681: Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
- 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)
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A polyester film for molded part having low strain stress in processing, thermoforming in a target shape is easy and appearance is excellent even when a metallic thin membrane is provided. A polyester film for molded part includes a film having a polyester resin composition mixed with a resin (A) of polyethylene terephthalate and a resin (B) of polyester selected from the group consisting of a polybutylene terephthalate resin and a polytrimethylene terephthalate resin where a resin (A) is 10 to 90% by mass and a resin (B) is 90 to 10% by mass based on the total of resin (A) and resin (B), wherein the resin (B) of polyester comprises a resin (B1) of polybutylene terephthalate and a resin (B2) of polytrimethylene terephthalate being mixed such that a resin (B1) is 10 to 90% by mass and a resin (B2) is 90 to 10% by mass based on the total of resin (B1) and resin (B2), and a ratio (D/H) of a half bandwidth D (° C.) of a recrystallization peak in falling temperature by differential scanning calorimeter (DSC) to the peak height H (mW) is 3 to 150° C./mW.

## Claims

### Claim 1

A polyester film for molded parts comprising a film comprising a polyester resin composition mixed with a resin (A) of a polyethylene terephthalate and a resin (B) of a polyester selected from the group consisting of a polybutylene terephthalate resin and a polytrimethylene terephthalate resin where resin (A) is 10 to 90% by mass and resin (B) is 90 to 10% by mass based on the total of resin (A) and resin (B), wherein said resin (B) comprises a resin (B1) of a polybutylene terephthalate and a resin (B2) of a polytrimethylene terephthalate mixed such that resin (B1) is 10 to 90% by mass and resin (B2) is 90 to 10% by mass based on the total of resin (B1) and resin (B2), and
a ratio (D/H) of a half bandwidth D (° C.) of a recrystallization peak in falling temperature by differential scanning calorimeter (DSC) to the peak height H (mW) is 3 to 150° C./mW.

### Claim 2 (depends on 1)

The polyester film of claim 1, wherein a recrystallization peak temperature (Tmc) in falling temperature by differential scanning calorimeter (DSC) is 140 to 205° C.

### Claim 3 (depends on 1)

The polyester film of claim 1, which is a biaxially oriented film.

### Claim 4 (depends on 1)

The polyester film of claim 1, wherein said polyester resin composition is mixed such that the resin (A) is 60 to 90% by mass and the resin (B) is 40 to 10% by mass based on the total of resin (A) and resin (B).

### Claim 5 (depends on 1)

The polyester film of claim 1, wherein a melting peak in raising temperature by differential scanning calorimeter (DSC) is a single peak.

### Claim 6 (depends on 1)

A film for metallic molded parts comprising: a metal compound deposited on at least one side of the biaxially oriented polyester film of claim 1.

### Claim 7 (depends on 1)

The biaxially oriented polyester film of claim 1, which is laminated on a surface of a formable decorative sheet.

### Claim 8 (depends on 1)

A formable laminate comprising the biaxially oriented polyester film of claim 1 laminated on a surface of a formable decorative sheet.

### Claim 9 (depends on 3, 8)

A method of forming a formable decorative sheet, comprising performing the formable laminate of claim 8, conducting trimming of the formable laminate, injecting a resin into the formable laminate, and peeling the biaxially oriented polyester film of claim 3.

### Claim 10 (depends on 3, 8)

A molded part obtained by peeling the biaxially oriented polyester film of claim 3 after molding the formable laminate of claim 8, wherein an absolute value of difference in surface gloss between the part and the formable decorative sheet before molding is less than 10.