Liquid crystalline polymer composition for films
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08G-063/02
C09K-019/38
C09K-019/02
C08G-063/60
B29D-007/01
C08G-064/00
출원번호
US-0032271
(2013-09-20)
등록번호
US-8853344
(2014-10-07)
발명자
/ 주소
Kim, Young Shin
Zhao, Xinyu
출원인 / 주소
Ticona LLC
대리인 / 주소
Dority & Manning, P.A.
인용정보
피인용 횟수 :
0인용 특허 :
92
초록▼
A film formed from a polymer composition containing one or more thermotropic liquid crystalline polymers is provided. The specific nature of the polymer or blend of polymers is selectively controlled so that the resulting polymer composition possesses both a low viscosity and high melt strength. The
A film formed from a polymer composition containing one or more thermotropic liquid crystalline polymers is provided. The specific nature of the polymer or blend of polymers is selectively controlled so that the resulting polymer composition possesses both a low viscosity and high melt strength. The present inventor has discovered that this unique combination of thermal properties results in a composition that is both highly melt processible and stretchable, which allows the resulting film to be oriented to a degree greater than previously thought possible.
대표청구항▼
1. A film comprising a polymer composition that includes a thermotropic liquid crystalline polymer, wherein the polymer composition has a melt viscosity of from about 35 to about 500 Pa-s, as determined in accordance with ISO Test No. 11443 at 15° C. higher than the melting temperature of the compos
1. A film comprising a polymer composition that includes a thermotropic liquid crystalline polymer, wherein the polymer composition has a melt viscosity of from about 35 to about 500 Pa-s, as determined in accordance with ISO Test No. 11443 at 15° C. higher than the melting temperature of the composition and at a shear rate of 400 seconds−1, and wherein the composition exhibits a maximum engineering stress of from about 340 kPa to about 600 kPa, as determined at the melting temperature of the composition with an extensional viscosity fixture and a rotational rheometer, and further wherein the melting temperature of the composition is from about 300° C. to about 400° C. 2. The film of claim 1, wherein the polymer composition has a melt viscosity of from about 35 to about 250 Pa-s, as determined in accordance with ISO Test No. 11443 at 15° C. higher than the melting temperature of the composition and at a shear rate of 400 seconds−1. 3. The film of claim 1, wherein the polymer composition has a complex viscosity of about 5,000 Pa-s or less at angular frequencies ranging from 0.1 to 500 radians per second, as determined by a parallel plate rheometer at 15° C. above the melting temperature and at a constant strain amplitude of 1%. 4. The film of claim 1, wherein the polymer composition exhibits a maximum engineering stress at a percent strain of from about 0.3% to about 1.5%, as determined at the melting temperature of the composition with an extensional viscosity fixture and a rotational rheometer. 5. The film of claim 1, wherein the polymer composition exhibits an elongational viscosity of from about 350 kPa-s to about 1500 kPa-s, as determined at the melting temperature of the composition with an extensional viscosity fixture and a rotational rheometer. 6. The film of claim 1, wherein the polymer composition exhibits a storage modulus of from about 1 to about 250 Pa as determined at the melting temperature of the composition and at an angular frequency of 0.1 rad/s. 7. The film of claim 1, wherein the thermotropic liquid crystalline polymer contains aromatic ester repeating units, the aromatic ester repeating units including aromatic dicarboxylic acid repeating units, aromatic hydroxycarboxylic acid repeating units, and aromatic diol repeating units. 8. The film of claim 7, wherein the aromatic hydroxycarboxylic acid repeating units are derived from 4-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, or a combination thereof, the aromatic dicarboxylic acid repeating units are derived from terephthalic acid, isophthalic acid, or a combination thereof, and the aromatic diol repeating units are derived from hydroquinone, 4,4′-biphenol, or a combination thereof. 9. The film of claim 1, wherein a first liquid crystalline polymer constitutes from about 10 wt. % to about 90 wt. % of the polymer content of the composition and the second liquid crystalline polymer constitutes from about 10 wt. % to about 90 wt. % of the polymer content of the composition. 10. The film of claim 9, wherein the first liquid crystalline polymer has a melt viscosity of from about 1 to about 60 Pa-s and the second liquid crystalline polymer has a melt viscosity of from about 100 to about 1000 Pa-s, as determined in accordance with ISO Test No. 11443 at 15° C. higher than the melting temperature of the composition and at a shear rate of 400 seconds−1. 11. The film of claim 9, wherein the first liquid crystalline polymer has a maximum engineering stress of from about 0.1 to about 50 kPa and the second liquid crystalline polymer has a maximum engineering stress of from about 150 to about 370 kPa, as determined at the melting temperature of the composition with an extensional viscosity fixture and a rotational rheometer. 12. The film of claim 9, wherein the first liquid crystalline polymer is produced by melt polymerization and the second liquid crystalline polymer is produced by solid-state polymerization. 13. The film of claim 9, wherein the first liquid crystalline polymer and the second liquid crystalline polymer are formed from repeating units derived from 4-hydroxybenzoic acid in an amount from about 10 mol. % to about 80 mol. %, repeating units derived from terephthalic acid and/or isophthalic acid in an amount from about 5 mol. % to about 40 mol. %, and repeating units derived from 4,4′-biphenol and/or hydroquinone in an amount from about 1 mol. % to about 30 mol. %. 14. The film of claim 1, wherein the film has an oxygen transmission rate of about 0.3 g/m2-24 hr or less, as determined in accordance with ASTM D3985-05 at a temperature of 23° C. and a relative humidity of 0%. 15. The film of claim 1, wherein the film has a moisture vapor transmission rate of about 0.2 g/m2-24 hr or less, as determined in accordance with ASTM F1249-06 at a temperature of 100° F. and 90% relative humidity. 16. A method for forming a film, the method comprising: melt processing a polymer composition that includes a thermotropic liquid crystalline polymer, wherein the polymer composition has a melt viscosity of from about 35 to about 500 Pa-s, as determined in accordance with ISO Test No. 11443 at 15° C. higher than the melting temperature of the composition and at a shear rate of 400 seconds−1, and wherein the composition exhibits a maximum engineering stress of from about 340 kPa to about 600 kPa, as determined at the melting temperature of the composition with an extensional viscosity fixture and a rotational rheometer, and further wherein the melting temperature of the composition is from about 300° C. to about 400° C.;supplying the melt processed composition to a die;blowing the melt processed composition into a bubble within the die, which is then collapsed to form the film. 17. The method of claim 16, wherein a first liquid crystalline polymer constitutes from about 10 wt. % to about 90 wt. % of the polymer content of the composition and the second liquid crystalline polymer constitutes from about 10 wt. % to about 90 wt. % of the polymer content of the composition. 18. The method of claim 16, wherein the die contains a mandrel that is positioned within the interior of an outer die body so that a space is defined therebetween, the polymer composition being blown through the space to form the bubble. 19. The method of claim 17, wherein outer body is generally concentric with the mandrel. 20. The method of claim 17, wherein the mandrel is rotatable about a central longitudinal axis. 21. The method of claim 17, wherein the outer die body is rotatable about a central longitudinal axis. 22. The method of claim 17, wherein the mandrel and the outer die body are rotatable about a central longitudinal axis in opposite directions.
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이 특허에 인용된 특허 (92)
Shepherd, James P.; Linstid, III, H. Clay; Provino, Vincent J., Anisotropic melt-forming polymers having a high degree of stretchability.
Harvey Andrew C. (Waltham MA) Lusignea Richard W. (Brighton MA) Rubin Leslie S. (Newton MA), Coextrusion of liquid crystal polymers and thermoplastic polymers.
Rubin Leslie S. ; Blizard Kent G. ; Haghighat Ross R. ; Lusignea Richard W., Extruded thermoplastic, liquid crystalline polymers and blends thereof having a planar morphology.
Hosoda, Tomoya; Okamoto, Satoshi; Fujiki, Toru; Ohtomo, Shinji, Liquid-crystalline polymer composition, method for producing the same, and molded article using the same.
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Lee Cherylyn (Fanwood NJ) Charbonneau Larry F. (Mendham NJ), Melt processable poly(ester amide) capable of forming an anisotropic melt containing an aromatic moiety capable of formi.
Harvey Andrew C. (Waltham MA) Lusignea Richard W. (Brighton MA) Racich James L. (Framingham MA), Multiaxially oriented thermotropic polymer films and method of preparation.
Calundann Gordon W. (North Plainfield NJ), Polyester of 6-hydroxy-2-naphthoic acid and para-hydroxy benzoic acid capable of readily undergoing melt processing.
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