# US 2013/0280461 A1 · Ethylene copolymer with improved hygienic property and process for preparing the same

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- Number: US 2013/0280461 A1
- Document ID: US20130280461A1
- Status: Published application
- Kind: A1
- Application number: 13/922,527
- Filed: 2013-06-20
- Published: 2013-10-24
- Earliest claimed: 2010-09-20
- Assignees: SK Innovation Co., Ltd.
- Applicants: SK Innovation Co., Ltd.
- Inventors: Seung Bum KWON; Se Won OH; Hyeong Taek HAM; Choon Sik SHIM; Sung Seok CHAE; Dae Ho SHIN
- Web page: https://patentgrep.com/patent/US20130280461A1

## CPC

- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F 10/00: Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F 4/65908: {in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+}
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 210/10: Isobutene
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is an ethylene copolymer having improved hygienic property. More particularly, the ethylene copolymer satisfies a correlation between a density thereof and an extract content. The ethylene copolymer having improved hygienic property can be applied in injection molding, rotation molding, or blow molding.

## Claims

### Claim 1

An ethylene copolymer obtained by polymerization of ethylene and a(C3-C18) α-olefin co-monomer, the ethylene copolymer being injection-moldable, wherein the ethylene copolymer has a density of 0.91 to 0.94 g/cm3 and a melt index (MI) of 3 to 50 g/10 min, and satisfies Formulas 1 and 2 below:
S≧(8×1056)×e−144.1D [Formula 1]
S≦(3×1025)×e−61.8D [Formula 2]
in Formulas 1 and 2, S represents an extract content of the ethylene copolymer at 35° C. after 10 minutes as measured by temperature rising elution fractionation analysis using 1,2,4-trichlorobenzene as a solvent, and D represents a density of the ethylene copolymer.

### Claim 2 (depends on 1)

The ethylene copolymer of claim 1, wherein the ethylene copolymer satisfies Formula 1 as defined in claim 1 and Formula 3 below:
S≦(7×1032)×e−81.1D [Formula 3]
in Formula 3, S represents an extract content of the ethylene copolymer and D represents a density of the ethylene copolymer.

### Claim 3 (depends on 1)

The ethylene copolymer of claim 1, wherein the extract content (S) of the ethylene copolymer is 1.8 wt % or lower.

### Claim 4 (depends on 1)

The ethylene copolymer of claim 1, wherein the extract content (S) of the ethylene copolymer is 0.1 to 1.8 wt %.

### Claim 5 (depends on 1)

The ethylene copolymer of claim 1, wherein the (C3˜C18) α-olefin comonomer is selected from propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, and a mixture thereof.

### Claim 6 (depends on 5)

The ethylene copolymer of claim 5, wherein the (C3˜C18) α-olefin comonomer is contained in a content of 1 to 40 wt %.

### Claim 7 (depends on 1)

The ethylene copolymer of claim 1, wherein the polymerization uses a catalyst composition including a transition metal catalyst represented by Chemical Formula 1 below:
in Chemical Formula 1, M represents a group IV transition metal in a periodic table;
Cp is a cyclopentadienyl ring or a fused ring including a cyclopentadienyl ring, which may be η5-bonded to the central metal M, and the cyclopentadienyl ring or the fused ring including a cyclopentadienyl ring may be further substituted with one or more selected from (C1-C20)alkyl, (C6-C30)aryl, (C2-C20)alkenyl, and (C6-C30)ar(C1-C20)alkyl;
R1 through R4 independently represent a hydrogen atom, a halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C10)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, or nitro, or the R1 through R4 are linked to an adjacent substituent via (C3-C12)alkylene or (C3-C12)alkenylene with or without a fused ring to form an alicyclic ring and a monocyclic or polycyclic aromatic ring;
Ar1 represents (C6-C30)aryl or (C3-C30)heteroaryl containing one or more selected from N, O, and S;
X1 and X2 independently represent a halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)ar(C1-C20)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, or
R11 through R15 independently represent a hydrogen atom, a halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C10)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, or nitro, or the R11 through R15 are linked to an adjacent substituent via (C3-C12)alkylene or (C3-C12)alkenylene with or without a fused ring to form an alicyclic ring and a monocyclic or polycyclic aromatic ring; and
the alkyl, aryl, cycloalkyl, aralkyl, alkoxy, alkylsiloxy, arylsiloxy, alkylamino, arylamino, alkylthio, and arylthio of R1 through R4, R11 through R15, and X1 and X2; a ring formed by linking R1 through R4 or R11 through R15 to an adjacent substituent via alkylene or alkenylene; and the aryl or heteroaryl of Ar1 may be further substituted with one or more selected from a halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C10)alkyl, (C1-C20)alkoxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, nitro, and hydroxy.

### Claim 8 (depends on 1)

An injection product manufactured by using the ethylene copolymer of claim 1.

### Claim 9 (depends on 8)

The injection product of claim 8, wherein the injection product is a food container.

### Claim 10 (depends on 8)

The injection product of claim 8, wherein the injection product is a refrigerating container.

### Claim 11 (depends on 8)

The injection product of claim 8, wherein the injection product is a pipe, a hollow molded product, a rotation molded product, a sheet product, or a compound product.