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US 12,371,554 B2Granted
Ethylene/alpha-olefin copolymer with excellent electrical insulation
AssigneeLG Chem, Ltd.
InventorsJin Sam Gong, Eun Jung Lee, Young Woo Lee, Jung Ho Jun, Dae Woong Lee, Jin Kuk Lee
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Abstract
An ethylene/alpha-olefin copolymer and method for preparing the same is disclosed herein. In some embodiments, an ethylene/alpha-olefin copolymer satisfying the following conditions, (a) a density of 0.85 to 0.89 g/cc, (b) a molecular weight distribution of 1.5 to 2.3, (c) a melting temperature of 85° C. or less, and (d) a free volume proportional constant (C2) of 600 or less. The ethylene/alpha-olefin copolymer has high volume resistance and light transmittance.
Claims9
An ethylene/alpha-olefin copolymer satisfying the following conditions (a) to (d):
- (a) a density of 0.85 to 0.89 g/cc;
- (b) a molecular weight distribution of 1.5 to 2.3;
- (c) a melting temperature of 85° C. or less;
- and
- (d) a free volume proportional constant (C2) of 600 or less, wherein C2 is derived from the following Equations 1 and 2:
- log
-
- η
- 0
- (
- T
- )
- η
- 0
- (
- T
- r
- )
- =
- log
-
- (
- a
- T
- )
- [
- Equation
-
- 1
- ]
- in Formula 1,
- η0(T) is a viscosity (Pa·s) of a copolymer measured at an arbitrary temperature of T(K) using Advanced Rheometric Expansion System (ARES-G2),
- η0(Tr) is a viscosity (Pa·s) of a copolymer measured at a reference temperature of Tr(K) using the ARES-G2, and
- aT is a shift factor of the arbitrary temperature of T (K) with respect to the reference temperature of Tr(K), and obtained from Equation 1 above,
- log
-
- (
- a
- T
- )
- =
- -
- C
- 1
- (
- T
- -
- T
- r
- )
- C
- 2
- +
- (
- T
- -
- T
- r
- )
- [
- Equation
-
- 2
- ]
- in Formula 2,
- C1 is a free volume inverse proportional constant,
- C2 is the free volume proportional constant,
- wherein C1 and C2 are intrinsic constants of the ethylene/alpha-olefin copolymer, and obtained from Equation 2 above.
65 more elements
Dependencies are inferred from the claim text.