Biaxially oriented polyester film for molded part

• US 8,354,171 B2
• Filed: 04/17/2007
• Issued: 01/15/2013
• Est. Priority Date: 04/19/2006
• Status: Active Grant

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Manabe, Isao, Matsui, Ryosuke, Kimura, Masahiro
• Primary Examiner(s): Chen, Vivian
• Application Number:
  US12/297,332
• Publication Number:
  US 20090311493A1
• Time in Patent Office: 2,100 Days
• Field of Search: None
• US Class Current: 428/458
• CPC Class Codes: B29C 2948/92561 Time, e.g. start, termination, duration or interruption
• CPC Class Codes: B29C 2948/926 Flow or feed rate
• CPC Class Codes: B29C 2948/92647 Thickness
• CPC Class Codes: B29C 2948/92704 Temperature
• CPC Class Codes: B29C 45/14827 using a transfer foil detachable from the insert
• CPC Class Codes: B29C 48/0018 combined with shaping by orienting, stretching or shrinking, e.g. film blowing B29C48/0017 takes precedence
• CPC Class Codes: B29C 48/022 characterised by the choice of material
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/305 having a wide opening, e.g. for forming sheets
• CPC Class Codes: B29C 48/37 Gear pumps
• CPC Class Codes: B29C 48/91 Heating, e.g. for cross linking
• CPC Class Codes: B29C 48/914 cooling drums
• CPC Class Codes: B29C 48/9165 Electrostatic pinning
• CPC Class Codes: B29C 55/023 using multilayered plates or sheets
• CPC Class Codes: B29C 55/143 firstly parallel to the direction of feed and then transversely thereto
• CPC Class Codes: B29K 2067/003 PET, i.e. poylethylene terephthalate
• CPC Class Codes: B29K 2067/006 PBT, i.e. polybutylene terephthalate
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: C23C 14/0015 characterized by the colour of the layer
• CPC Class Codes: C23C 14/20 : on organic substrates
• CPC Class Codes: Y10T 156/1002 : with permanent bending or reshaping or surface deformation of self sustaining lamina
• CPC Class Codes: Y10T 156/11 : Methods of delaminating, per se; i.e. , separating at bonding face
• CPC Class Codes: Y10T 428/24802 : Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/31678 : Of metal
• CPC Class Codes: Y10T 428/31681 : Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/3179 : Next to cellulosic

Abstract

A biaxially oriented polyester film is provided, in particular, a biaxially oriented polyester film for molded part capable of being used suitably as a metallic molded part processed after metal deposition on a film surface and a surface protection film in forming a decorative sheet. Provided is a biaxially oriented polyester film for molded part, which is a polyester film that at least two layers of A layer composed of polyester A and B layer composed of polyester B are laminated, wherein

• • interlayer adhesion between A layer and B layer is 5 (N/15 mm) or more, and
  • stress at 100% elongation (F100 value, unit: MPa) at 200° C. and 150° C. in the longitudinal direction and transverse direction of a film is 1 to 50.

Claims

1. A biaxially oriented polyester film for a molded part comprising a polyester film that has at least layer A and layer B, wherein layer A comprises polyester A, layer B comprises polyester B, and layer A and layer B are laminated together,

interlayer adhesion between layer A and layer B is 5 N/15 mm or more,

stress at 100% elongation (F100 value) at 200°

C. and 150°

C. in longitudinal and transverse directions of the film is 1 to 50 MPa, and

tensile elongation at break at 200°

C. and 150°

C. in the longitudinal direction and transverse direction of the film is 150 to 400%.

2. The biaxially oriented polyester film according to claim 1, comprising layer A, layer B and a layer C.

3. The biaxially oriented polyester film according to claim 1, wherein interlayer adhesion between layer A and layer B after being stretched at 200°

C. by 1.2 times in the longitudinal direction and transverse direction of the film is 3 N/15 mm or more.

4. The biaxially oriented polyester film according to claim 1, wherein glycol residue components constituting polyester B comprise:

glycol residue component Ba;

ethylene glycol residue of 60 to 90 mole %,

glycol residue component Bb1;

1,4-butanediol residue of 9 to 40 mole %, and

glycol residue component Bb2;

other glycol component different from Ba and Bb1 of 1 to 20 mole %.

5. The biaxially oriented polyester film according to claim 4, wherein glycol residue component Bb2 contains 1,4-cyclohexanedimethanol residue component.

6. The biaxially oriented polyester film according to claim 1, wherein glycol residue components constituting polyester A comprise:

glycol residue component Aa;

ethylene glycol residue of 60 to 90 mole %, and

glycol residue component Ab;

other glycol component different from glycol residue component Aa of 10 to 40 mole %.

7. The biaxially oriented polyester film according to claim 1, wherein glycol residue components constituting polyester A comprise:

glycol residue component Aa;

ethylene glycol residue of 60 to 90 mole %,

glycol residue component Ab1;

1,4-butanediol residue of 9 to 40 mole %, and

glycol residue component Ab2;

other glycol component different froth Aa and Ab1 of 1 to 20 mole %.

8. The biaxially oriented polyester film according to claim 7, wherein glycol residue component Ab2 contains 1,4-cyclohexanedimethanol residue component.

9. The biaxially oriented polyester film according to claim 1, having a haze of 0.01 to 02%/μ

m.

10. The biaxially oriented polyester film according to claim 1, wherein heat-shrinkable stress at 200°

C. in the longitudinal direction and transverse direction is 0 to 0.16 MPa.

11. A film for a metallic molded part, comprising a metal compound deposited on at least one surface of the biaxially oriented polyester film according to claim 1.

12. The biaxially oriented polyester film according to claim 1, laminated on a surface of a formable decorative sheet.

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

14. A method of forming a molded part comprising preforming the formable laminate according to claim 13;

trimming said perform laminate; and

injecting a resin into said trimmed laminate to obtain a Molded article, and the peeling the biaxially oriented polyester film from said molded article to obtain the molded part.

15. A molded part obtained by peeling the biaxially oriented polyester film from a molded article after obtaining the molded article by forming the formable laminate according to claim 13, wherein an absolute value of difference in surface gloss from a formable decorative sheet before forming is less than 10.