[미국특허]
Polyethylene film having improved mechanical and barrier properties and method of making same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-010/00
C08F-010/02
C08F-008/00
C08L-023/00
C08L-023/04
B32B-027/00
B32B-027/08
출원번호
UP-0427019
(2006-06-28)
등록번호
US-7632907
(2009-12-24)
발명자
/ 주소
Sukhadia, Ashish M.
Martin, Joel L.
Yang, Qing
Jayaratne, Kumudini C.
Lanier, J. Todd
출원인 / 주소
Chevron Phillips Chemical Company LP
대리인 / 주소
Conley Rose, P.C.
인용정보
피인용 횟수 :
22인용 특허 :
16
초록▼
A polyethylene film comprising a polymer composition having the characteristics of a total energy dart drop, measured in accordance with ASTM D4272, of greater than a bout 0.45 ft.lbf, a dart drop impact strength, measured in accordance with ASTM D1709 Method A, of greater than about 135 g, and a mo
A polyethylene film comprising a polymer composition having the characteristics of a total energy dart drop, measured in accordance with ASTM D4272, of greater than a bout 0.45 ft.lbf, a dart drop impact strength, measured in accordance with ASTM D1709 Method A, of greater than about 135 g, and a moisture vapor transmission rate, measured in accordance with ASTM F1249 at 100° F. and 90% relative. humidity, of less than about 0.85 g-mil/100 square inch/24 hr, wherein said ASTM tests are performed on a test specimen having a 0.8 mil thickness.
대표청구항▼
What is claimed is: 1. A polyethylene film comprising a polymer composition, the film having the following characteristics: a total energy dart drop, measured in accordance with ASTM D4272, of greater than about 0.45 ft.lbf; a dart drop impact strength, measured in accordance with ASTM D1709 Method
What is claimed is: 1. A polyethylene film comprising a polymer composition, the film having the following characteristics: a total energy dart drop, measured in accordance with ASTM D4272, of greater than about 0.45 ft.lbf; a dart drop impact strength, measured in accordance with ASTM D1709 Method A, of greater than about 135 g; and a moisture vapor transmission rate, measured in accordance with ASTM F1249 at 100° F. and 90% relative humidity, of less than about 0.85 g-mil/100 square inch/24 hr, wherein said ASTM tests are performed on a test specimen having a 0.8 mil thickness, wherein the polymer composition has a density of equal to or greater than 0.940 g/cc, and wherein the polymer composition has a Carreau-Yasuda equation "a" parameter value of greater than 0.3 when the dynamic complex viscosity versus frequency scan data obtained at 190° C. are fitted to the Carreau-Yasuda equation with an n value of 0.1818. 2. The film of claim 1 wherein the polymer composition comprises a copolymer of ethylene and an alpha olefin comonomer. 3. The film of claim 2 wherein the alpha olefin comonomer comprises 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene or combinations thereof. 4. The film of claim 1 further comprising a Spencer impact of greater than about 0.35 J as determined in accordance with ASTM D3420. 5. The film of claim 1 further comprising an oxygen transmission rate of equal to or less than about 400 cm3-mil/100 sq. in./day as determined in accordance with ASTM D3985. 6. The film of claim 1 further comprising a 1% transverse direction secant modulus of greater than about 170,000 psi as determined in accordance with ASTM D882. 7. The film of claim 1 further comprising a 1% machine direction secant modulus of greater than about 130,000 psi as determined in accordance with ASTM D882. 8. The film of claim 1 wherein the polymeric composition has a weight average molecular weight of from about 180,000 g/mol to about 350,000 g/mol. 9. The film of claim 1 wherein the polymeric composition is multimodal. 10. The film of claim 1 wherein the polymeric composition is bimodal. 11. The film of claim 1 further comprising an Elmendorf tear strength in the transverse direction of equal to or greater than about 85 g as determined in accordance with ASTM D1922. 12. The film of claim 1 wherein the polymeric composition has an "eta zero" value of less than about 4×105 Pa.s when the dynamic complex viscosity versus frequency scan data are fitted to the Carreau-Yasuda equation with an n=0.1818 value. 13. The film of claim 1 wherein the polymeric composition has a "tau eta" value of less than about 5 s when the dynamic complex viscosity versus frequency scan data are fitted to the Carreau-Yasuda equation with an n=0.1818 value. 14. The film of claim 1 further comprising a dart drop impact of greater than about 200 g as determined in accordance with ASTM D1709, Method A. 15. A polyethylene film comprising a polymer composition, the film having the following characteristics: a total energy dart drop, measured in accordance with ASTM D4272, of greater than about 0.45 ft.lbf; a dart drop impact strength, measured in accordance with ASTM D1709 Method A, of greater than about 135 g; and an oxygen transmission rate, measured in accordance with ASTM D3985 at 73° F. and 0% relative humidity, of less than about 400 cm3-mil/100 square inch/24 hr, wherein said ASTM tests are performed on a test specimen having a 0.8 mil thickness, wherein the polymer composition has a density of equal to or greater than 0.940 g/cc, and wherein the polymer composition has a Carreau-Yasuda equation "a" parmeter value of greater than 0.3 when the dynamic complex viscosity versus frequency scan data obtained at 190° C. are fitted to the Carreau-Yasuda equation with an n value of 0.1818. 16. A polyethylene film comprising a polymer composition, the film having the following characteristics: a total energy dart drop, measured in accordance with ASTM D4272, of greater than about 0.45 ft.lbf; a dart drop impact strength, measured in accordance with ASTM D1709 Method A, of greater than about 135 g; and a 1% machine direction secant modulus, measured in accordance with ASTM D882 at 10.2 mm/min, of equal to or greater than about 130,000 psi, wherein said ASTM tests are performed on a test specimen having a 0.8 mil thickness, and wherein the polymer composition has a Carreau-Yasuda equation "a" parameter value of greater than 0.3 when the dynamic complex viscosity versus frequency scan data obtained at 190° C. are fitted to the Carreau-Yasuda equation with an n value of 0.1818. 17. A polyethylene film comprising a polymer composition, the film having the following characteristics: a total energy dart drop, measured in accordance with ASTM D4272, of greater than about 0.45 ft.lbf a dart drop impact strength, measured in accordance with ASTM D1709 Method A, of greater than about 135 g; and a 1% transverse direction secant modulus, measured in accordance with ASTM D882 at 10.2 mm/min, of equal to or greater than about 170,000 psi, wherein said ASTM tests are performed on a test specimen having a 0.8 mil thickness, and wherein the polymer composition has a Carreau-Yasuda equation "a" parameter value of greater than 0.3 when the dynamic complex viscosity versus frequency scan data obtained at 190° C. are fitted to the Carreau-Yasuda equation with an n value of 0.1818. 18. A polyethylene film comprising a polymer composition having: (a) an "a" value of greater than about 0.45; (b) an "eta zero" value of less than about 4×105Pa.s; (c) a "tau eta" value of less than about 5s; and (d) a density of equal to or greater than 0.940 g/cc when the dynamic complex viscosity versus frequency data obtained at 190° C. is fitted to the Carreau-Yasuda equation with an n value of 0.1818, wherein the polyethylene film displays a moisture vapor transmission rate equal to or less than about 0.85 g-mil/ 100 sq. in/day determined in accordance with ASTM F 1249 and a total energy dart drop impact of equal to or greater than about 1.0 ft.lbf as determined in accordance with ASTM D4272 when performed on a test specimen having a 0.8 mil thickness. 19. The polyethylene film of claim 1 wherein the polymer composition comprises a higher molecular weight ethylene/1-olefin copolymer component and a lower molecular weight ethylene/1-olefin copolymer component. 20. A polyethylene film comprising a polymer composition having: (a) an "a" value of greater than about 0.45; (b) an "eta zero " value of less than about 4×105Pa.s; (c) a "tau eta " value of less than about 5 s; and (d) a density of equal to or greater than 0.940 g/cc when the dynamic complex viscosity versus frequency data obtained at 190° C. is fitted to the Carreau-Yasuda equation with an n value of 0.1818, wherein the polyethylene film displays: (i) a moisture vapor transmission rate equal to or less than about 0.85 g-mil/100 sq. in/day determined in accordance with ASTM F 1249; (ii) an oxygen transmission rate equal to or less than about 400 cm3-mil/100 sq. in/day determined in accordance with D 3985; and (iii) a total energy dart drop impact of equal to or greater than about 0.45 ft.lbf as determined in accordance with ASTM D4272, when performed on a test specimen having a 0.8 mil thickness.
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