Liquid crystal polyester resin composition

• US 5,997,765 A
• Filed: 02/19/1997
• Issued: 12/07/1999
• Est. Priority Date: 02/19/1996
• Status: Expired due to Term

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Yamaguchi, Takanari, Furuta, Motonobu
• Primary Examiner(s): WU, SHEAN CHIU
• Application Number:
  US08/802,258
• Time in Patent Office: 1,021 Days
• Field of Search: 252/299.01, 252/299.67, 428/1.1, 428/411.1, 428/480, 428/483, 525/66, 525/133, 525/40, 524/500, 524/539, 524/604, 524/605, 206/96, 206/709
• US Class Current: 252/299.01
• CPC Class Codes: B65D 65/02 Wrappers or flexible covers
• CPC Class Codes: B65D 65/38 Packaging materials of special type or form
• CPC Class Codes: C08J 2367/00 Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
• CPC Class Codes: C08J 2367/04 Polyesters derived from hydroxy carboxylic acids, e.g. lactones C08J2367/06 takes precedence
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08L 2666/08 Homopolymers or copolymers according to C08L7/00 - C08L21/00; Derivatives thereof
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers

Abstract

A liquid crystal polyester resin composition comprising a liquid crystal polyester (A) in a continuous phase and a rubber having a functional group reactive with the liquid crystal polyester (B) in a dispersed phase. A liquid crystal polyester resin composition of the present invention is excellent in heat resistance, molding processability and mechanical properties, particularly in impact resistance and tensile property, capable of improving anisotropy of a molded article. Furthermore, film formation processability can be improved at a low cost, and a film produced for the composition has excellent gas barrier property, drawing property and flexibility.

Claims

1. A liquid crystal polyester resin composition comprising 65.0 to 99.9 weight % of a liquid crystal polyester (A) in a continuous phase and 35.0 to 0.1 weight % of a rubber (B) having a functional group reactive with the liquid crystal polyester in a dispersed phase,

wherein said liquid crystal polyester (A) is a member selected from the group of combinations of repeat units (I)-(VI) consisting of:

##STR15##

2. The liquid crystal polyester resin composition according to claim 1 comprising 70 to 98 weight % of the liquid crystal polyester (A) and 30 to 2 weight % of the rubber (B).

3. The liquid crystal polyester resin composition according to claim 1, wherein the functional group reactive with the liquid crystal polyester in the rubber (B) is an epoxy group, an oxazolyl group or an amino group.

4. A liquid crystal polyester resin composition according to claim 1, wherein the functional group reactive with the liquid crystal polyester in the rubber (B) is an epoxy group.

5. A liquid crystal polyester resin composition according to claim 4, wherein the rubber (B) comprises (meth)acrylate-ethylene-unsaturated carboxylic acid glycidyl ester and/or unsaturated glycidyl ether copolymer rubber.

6. A liquid crystal polyester resin composition according to claim 5, wherein (meth)acrylate comprises at least one selected from the group consisting of methyl acrylate, methyl methacrylate, n-butyl acrylate, n-butyl methacryalte, tert-butyl acrylate, tert-butyl methacrylate and 2-ethyl hexyl acrylate, 2-ethyl hexyl methacrylate.

7. A liquid crystal polyester resin composition according to claim 5, wherein the rubber (B) is a copolymer comprising more than 40 but less than 97 weight % of (meth)acrylate unit, more than 3 but less than 50 weight % of an ethylene unit, and 0.1 to 30 weight % of an unsaturated carboxylic acid glycidyl ester and/or unsaturated glycidyl ether unit.

8. A liquid crystal polyester resin composition according to claim 4, wherein the Mooney viscosity of the rubber (B) is in the range of 3 to 70.

9. A liquid crystal polyester resin composition according to claim 5, wherein the Mooney viscosity of the rubber (B) is in the range of 3 to 30.

10. A liquid crystal polyester resin composition according to claim 4, wherein the rubber (B) is obtained by epoxydating a copolymer or a hydrogenated copolymer comprising sequences of a vinyl aromatic hydrocarbon compound (a) and sequences of a conjugated diene compound.

11. A liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester (A) comprises at least 30 mole % of a repeating unit represented by the below mentioned formula:

12. A liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester (A) is obtained by the reaction of aromatic dicarboxylic acid, aromatic diol and aromatic hydroxycarboxylic acid.

13. A liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester (A) is obtained by the reaction of a combination of different kinds of aromatic hydroxycarboxylic acids.

14. A liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester (A) comprises the below-mentioned repeating unit combination:

15. A liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester (A) comprises the below-mentioned repeating unit combination:

16. A liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester (A) comprises the below-mentioned repeating unit combination:

17. A liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester (A) comprises the below-mentioned repeating unit combination:

18. A film obtained comprising the liquid crystal polyester resin composition according to claim 1.

19. A film obtained by single-axis drawing or two-axis drawing of the liquid crystal polyester resin composition according to claim 1 melt-extruded from a T die.

20. A film obtained by inflation molding of the liquid crystal polyester resin composition according to claim 1.

21. A laminated film comprising a film which comprises the liquid crystal polyester resin composition according to claim 1 and a film which comprises a thermoplastic resin excluding the liquid crystal polymer and the liquid crystal polyester resin composition, having at least two layers.

22. A laminated film according to claim 21, wherein the thermoplastic resin comprises at least one selected from the group consisting of polyethylene, polypropylene, polystyrene, polycarbonate, polyethylene terephthalate, polybuthylene terephthalate, polyacetal, polyamide polyphenylene ether, polyether sulfone, ehylene-α

-olefin copolymer, polyvinyl chloride, polyvinylidene chloride, polyacetal, polyphenylene sulfide, ethylene-vinyl acetate copolymer and a fluorine resin.

23. A laminated film according to claim 22, produced by coextrusion of a liquid crystal polyester resin composition and a thermoplastic resin excluding the liquid crystal polyester and the liquid crystal polyester resin composition with a coextrusion die having two or more layers.

24. A wrapping material for pouching comprising the liquid crystal polyester resin composition according to claim 1.

25. A wrapping material for electronic parts comprising the liquid crystal polyester resin composition according to claim 1.

26. A wrapping material for electronic parts comprising a cover tape and emboss carrier tape obtainable from the liquid crystal polyester resin composition according to claim 1.

27. A liquid crystal polyester resin composition container obtained with the liquid crystal polyester resin composition according to claim 1 with the ratio of the depth of the container and the aperture of the container of 1/10 or more in a round container, and with the ratio of the depth of the container and the longest diagonal at the aperture of the container of 1/10 or more.

28. A liquid crystal polyester resin composition container and lid each of which comprises a sheet or a film comprising the liquid crystal polyester resin composition according to claim 1 adhered to and closely sealed together to accomodate contents therein.

29. A retort container which is the liquid crystal polyester resin composition container according to claim 27.

30. A hollow molded container comprising the liquid crystal polyester resin composition according to claim 1.

31. A blow molded container comprising a layer of the liquid crystal polyester resin composition according to claim 1 and a layer of a thermoplastic resin composition excluding the liquid crystal polyester.

32. A fuel container which is the blow molded container according to claim 31.

33. A fuel container according to claim 32, wherein the thermoplastic resin is a high density polyethylene having a density of 0.940 to 0.980 and a limiting viscosity of 2 to 7 dl/g.

34. A retort container which is the liquid crystal polyester resin composition container according to claim 28.