Thermoplastic polyester composition and film made therefrom

• US 6,124,031 A
• Filed: 09/22/1993
• Issued: 09/26/2000
• Est. Priority Date: 01/24/1992
• Status: Expired due to Fees

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Ueda, Toshiaki, Yoshida, Minoru, Suzuki, Masaru, Sasaki, Toshihiro, Aoyama, Masatoshi
• Primary Examiner(s): Seidleck, James J.
• Assistant Examiner(s): RAJGURU, UMAKANT K
• Application Number:
  US08/119,075
• Time in Patent Office: 2,561 Days
• Field of Search: 524/430, 524/425, 524/492, 524/493, 524/447, 524/417, 428/141, 428/327, 428/328, 428/329, 428/330, 428/331, 428/480
• US Class Current: 428/329
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08K 2003/2227 of aluminium
• CPC Class Codes: C08K 2201/014 Additives containing two or more different additives of the same subgroup in C08K
• CPC Class Codes: C08K 3/01 characterized by their specific function
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/257 Iron oxide or aluminum oxide
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

Disclosed are a thermoplastic polyester composition comprising a thermoplastic polyester (A) prepared from an acid component mainly comprising an aromatic dicarboxylic acid and a glycol component mainly comprising an aliphatic glycol and θ-type aluminum oxide particles (B); a thermoplastic polyester composition comprising the thermoplastic polyester (A) and a mixture (C) of two or more kinds of aluminum oxide particles different from each other in crystal structure; and films made from these compositions. Particularly, the films formed from the compositions can have excellent slipping property, abrasion resistance, and scratch resistance in repeated high-speed running.

Claims

1. A thermoplastic polyester lamination structure comprising 1) at least one layer of a thermoplastic polyester (A) prepared from i) an acid component mainly comprising an aromatic dicarboxylic acid and a glycol component mainly comprising an aliphatic glycol and ii) θ

-type aluminum oxide particles (B) and

     2) at least one layer of another thermoplastic polyester laminated to said layer of a thermoplastic polyester (A).

4. The thermoplastic polyester lamination structure according to any of claims 1, 14, 15 or 17, wherein the primary particle diameter of said aluminum oxide particles (B) is not less than 3 nm and not more than 200 nm.

5. The thermoplastic polyester lamination structure according to any of claims 1, 14, 15 or 17, wherein said aluminum oxide particles (B) are synthesized by calcining an aluminum hydroxide prepared from a raw material of an aluminum alkoxide by hydrolysis.

6. The thermoplastic polyester lamination structure according to any of claims 1, 14, 15 or 17, wherein inert particles having a primary particle diameter of more than the primary particle diameter of said aluminum oxide particles (B) are used together.

7. The thermoplastic polyester lamination structure according to claim 6, wherein said inert particles are inorganic particles.

8. The thermoplastic polyester lamination structure according to claim 7, wherein said inert particles are selected from the group consisting of calcium carbonate, silica, titanium oxide, kaoline and calcium phosphate particles.

9. The thermoplastic polyester lamination structure according to claim 6, wherein said inert particles are organic particles.

10. The thermoplastic lamination stucture according to claim 9, wherein said inert particles are selected from crosslinked polymeric particles or internal particles precipitated in a polyester reaction system.

11. The lamination structure according to claims 1, 2, 14, 15, 16 or 17, wherein the rate of secondary particles having a diameter of not more than 0.05 μ

m determined in a direction parallel to a film surface among agglomerated secondary aluminum oxide particles is not less than 20% and not more than 60% in number distribution of particle diameter.

12. The lamination structure according to claims 1, 2, 14, 15, 16 or 17, wherein the number of protrusions having a height of not less than 10 nm and not more than 60 nm on a film surface of the layer is not less than 500,000/mm² and not more than 5,000,000/mm².

13. The lamination structure according to any of claims 1, 2, 14, 15, 16 or 17, wherein said lamination structure is a base film for a magnetic recording medium.

2. A thermoplastic polyester lamination structure comprising 1) at least one layer of a thermoplastic polyester (A) prepared from i) an acid component mainly comprising an aromatic dicarboxylic acid, a glycol component mainly comprising an aliphatic glycol and ii) a mixture (C) of two or more kinds of aluminum oxide particles different from each other in crystal structure and 2) at least one layer of another thermoplastic polyester laminated to said layer of a thermoplastic polyester (A).

3. The thermoplastic polyester lamination structure according to claims 2 or 19, wherein at least one kind of particles in said mixture are aluminum oxide particles selected from the group consisting of θ

-type, η

-type, κ

-type and 102 -type aluminum oxide particles.

14. A thermoplastic polyester laminate structure comprising 1) at least one layer of a thermoplastic polyester (A) prepared from i) an acid component mainly comprising an aromatic dicarboxylic acid and a glycol component mainly comprising an aliphatic glycol and ii) θ

-type aluminum oxide particles (B), wherein thickness "t" of said layer of a thermoplastic polyester (A) and primary particle diameter "D" of the aluminum oxide particles (B) satisfy the formula 0.1D≦

t≦

100D, and

     2) at least one layer of another thermoplastic polyester laminated to said layer of thermoplastic polyester (A).

15. A thermoplastic polyester laminate structure comprising at least two layers, said two layers each comprising a thermoplastic polyester (A) prepared from i) an acid component mainly comprising an aromatic dicarboxylic acid and a glycol component mainly comprising an aliphatic glycol and ii) θ

-type aluminum oxide particles (B).

16. A thermoplastic polyester laminate structure comprising at least two layers, said two layers each comprising a thermoplastic polyester (A) prepared from i) an acid component mainly comprising an aromatic dicarboxylic acid and a glycol component mainly comprising an aliphatic glycol and ii) a mixture (C) of two or more kinds of aluminum oxide particles different from each other in crystal structure.

17. A thermoplastic polyester lamination structure comprising at least one layer of a thermoplastic polyester (A) prepared from i) an acid component mainly comprising an aromatic dicarboxylic acid and a glycol component mainly comprising an aliphatic glycol and ii) θ

-type aluminum oxide particles (B), said particles having an acicular or platy shape.