Polyolefin compositions exhibiting heat resistivity, low hexane-extractives and controlled modulus
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0788981
(1997-01-27)
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발명자
/ 주소 |
- deGroot Jacquelyn A.
- Hazlitt Lonnie G.
- Jain Pradeep
- Karande Seema V.
- Mergenhagen Laura K.
- Moldovan Dan G.
- Stewart Kenneth B.
- Whiteman Nicole F.
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
51 인용 특허 :
276 |
초록
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The subject invention provides a polymer mixture having high heat resistivity, low hexane extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homo
The subject invention provides a polymer mixture having high heat resistivity, low hexane extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homogeneously branched polymer, heterogeneously branched linear polymer or a non-short chain branched linear polymer. When fabricated into film, the mixture is characterized by a heat seal initiation temperature which is substantially lower than its Vicat softening point as well as a high ultimate hot tack strength. When fabricated as a molded article, the mixture is characterized by high microwave warp distortion while maintaining a lower modulus. The polymer mixture is particularly well-suited for use in multilayer film structures as a sealant layer for such applications as cook-in packages, hot-fill packages, and barrier shrink films. In molding applications, the mixture is well-suited as freezer-to-microwave food storage containers and lids which maintain good flexibility at low temperature to allow easy openability of such containers.
대표청구항
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[ We claim:] [1.] A polymer mixture suitable for fabricating packaging films and coatings comprising(A) from 15 to 60 weight percent, based on the total weight of the mixture, of at least one first ethylene polymer which is a substantially linear ethylene-alpha olefin polymer having a density in the
[ We claim:] [1.] A polymer mixture suitable for fabricating packaging films and coatings comprising(A) from 15 to 60 weight percent, based on the total weight of the mixture, of at least one first ethylene polymer which is a substantially linear ethylene-alpha olefin polymer having a density in the range of 0.850 to 0.920 g/cc, wherein the substantially linear ethylene polymer is further characterized as havingi. a melt flow ratio, I.sub.10 /I.sub.2 .gtoreq.5.63,ii. a molecular weight distribution, M.sub.w /M.sub.n, as determined by gel permeation chromatography and defined by the equation: (M.sub.w /M.sub.n).ltoreq.(I.sub.10 /I.sub.2)-4.63,iii. a gas extrusion rheology such that the critical shear rate at onset of surface melt fracture for the substantially linear ethylene polymer is at least 50 percent greater than the critical shear rate at the onset of surface melt fracture for a linear ethylene polymer, wherein the substantially linear ethylene polymer and the linear ethylene polymer comprise the same comonomer or comonomers, the linear ethylene polymer has an I.sub.2, M.sub.w /M.sub.n and density within ten percent of the substantially linear ethylene polymer and wherein the respective critical shear rates of the substantially linear ethylene polymer and the linear ethylene polymer are measured at the same melt temperature using a gas extrusion rheometer, andiv. a single differential scanning calorimetry, DSC, melting peak between -30.degree. and 150.degree. C.; and(B) from 40 to 85 weight percent, based on the total weight of the mixture, of at least one second ethylene polymer which is a homogeneously branched, heterogeneously branched linear, or non-short chain branched linear ethylene polymer having a density between 0.890 and 0.942 g/cc;wherein the polymer mixture is characterized as having a density of from 0.890 to 0.930 g/cc, and a differential between the densities of the first ethylene polymer and the second ethylene polymer of at least 0.015 g/cc with the proviso that where the density of the first ethylene polymer is less than 0.887 g/cc, the density of the second ethylene polymer is greater than 0.920 g/cc, a Vicat softening point of at least 75.degree. C., a compositional hexane extractive of less than 10 percent based on the total weight of the mixture; and rein(a) a 0.038 mm thick coextruded sealant layer fabricated from the polymer mixture has a heat seal initiation temperature equal to or less than 100.degree. C. and an ultimate hot tack strength of at least 2.56 N/cm, and(b) the Vicat softening point of the polymer mixture is more than 6.degree. C. higher than the heat seal initiation temperature of the coextruded sealant layer.
이 특허에 인용된 특허 (276)
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