Ethylene-based modifier, ethylene-based resin composition, film, method for producing ethylene-based resin composition, and method for producing film
Provided is an ethylene-based modifier with which a film having good slipperiness and relatively less fish eyes can be formed. The ethylene-based modifier has a strain-hardening exponent of 0.27 or more and 0.53 or less as determined by the LAOS method.
1. An ethylene-based resin composition having an average relaxation time of 50 sec or longer and 160 sec or shorter, wherein the ethylene-based resin composition comprises:
an ethylene-based modifier and a component (B) below,
wherein the ethylene-based modifier contains a component (A) below and the component (B), and contains 50 mass % or more and 90 mass % or less of the component (A) and 10 mass % or more and 50 mass % or less of the component (B) with respect to 100 mass % of a total mass of the component (A) and the component (B), and
a content of the component (A) with respect to 100 mass % of a total mass of the ethylene-based resin composition is 15 mass % or more and 45 mass % or less:
Component (A): ethylene-α-olefin copolymer,
density: 915 kg/m 3 or more and 950 kg/m 3 or less,
ratio (Mw/Mn) of weight-average molecular weight to number-average molecular weight: 7.3 or more,
Component (B): ethylene-α-olefin copolymer,
density: 890 kg/m 3 or more and 930 kg/m 3 or less,
MFR: 0.5 g/10 min or more and 5.0 g/10 min or less,
MFRR: 10 or more and 30 or less.
2. A method for producing an ethylene-based resin composition having an average relaxation time of 50 sec or longer and 160 sec or shorter, the method comprising:
a step 1 below and a step 2 below:
<Step 1>
a step of melt-kneading 50 mass % or more and 90 mass % or less of a component (A) below and 10 mass % or more and 50 mass % or less of a component (B) below with respect to 100 mass % of a total mass of the component (A) and the component (B) to provide an ethylene-based modifier,
<Step 2>
a step of melt-kneading the ethylene-based modifier obtained in the step 1 and the component (B) to provide an ethylene-based resin composition, wherein the ethylene-based resin composition contains 15 mass % or more and 45 mass % or less of the component (A) with respect to 100 mass % of a total mass of the ethylene-based resin composition:
Component (A): ethylene-α-olefin copolymer,
density: 915 kg/m 3 or more and 950 kg/m 3 or less,
ratio (Mw/Mn) of weight-average molecular weight to number-average molecular weight: 7.3 or more,
Component (B): ethylene-α-olefin copolymer,
density: 890 kg/m 3 or more and 930 kg/m 3 or less,
MFR: 0.5 g/10 min or more and 5.0 g/10 min or less,
MFRR: 10 or more and 30 or less.
3. An ethylene-based resin composition produced by the method according to claim 2 .
4. A method for producing a film having an ethylene-based resin layer containing an ethylene-based resin composition having an average relaxation time of 50 sec or longer and 160 sec or shorter, the method comprising:
a step 1 below, a step 2 below, and a step 3 below:
<Step 1>
a step of melt-kneading 50 mass % or more and 90 mass % or less of a component (A) below and 10 mass % or more and 50 mass % or less of a component (B) below with respect to 100 mass % of a total mass of the component (A) and the component (B) to provide an ethylene-based modifier,
<Step 2>
a step of melt-kneading the ethylene-based modifier obtained in the step 1 and the component (B) to provide an ethylene-based resin composition, wherein the ethylene-based resin composition contains 15 mass % or more and 45 mass % or less of the component (A) with respect to 100 mass % of a total mass of the ethylene-based resin composition,
<Step 3>
a step of forming a film having an ethylene-based resin layer by a cast film process using the ethylene-based resin composition obtained in the step 2,
Component (A): ethylene-α-olefin copolymer,
density: 915 kg/m 3 or more and 950 kg/m 3 or less,
ratio (Mw/Mn) of weight-average molecular weight to number-average molecular weight: 7.3 or more,
Component (B): ethylene-α-olefin copolymer,
density: 890 kg/m 3 or more and 930 kg/m 3 or less,
MFR: 0.5 g/10 min or more and 5.0 g/10 min or less,
MFRR: 10 or more and 30 or less.
5. A film produced by the method according to claim 4 .
6. A film comprising:
an ethylene-based resin layer containing the ethylene-based resin composition according to claim 1 .
7. A method for producing the ethylene-based resin composition according to claim 1 , the method comprising:
a step 1 below and a step 2 below:
<Step 1>
a step of melt-kneading 50 mass % or more and 90 mass % or less of a component (A) below and 10 mass % or more and 50 mass % or less of a component (B) below with respect to 100 mass % of a total mass of the component (A) and the component (B) to provide an ethylene-based modifier,
<Step 2>
a step of melt-kneading the ethylene-based modifier obtained in the step 1 and the component (B) to provide an ethylene-based resin composition, wherein the ethylene-based resin composition contains 15 mass % or more and 45 mass % or less of the component (A) with respect to 100 mass % of a total mass of the ethylene-based resin composition:
Component (A): ethylene-α-olefin copolymer,
density: 915 kg/m 3 or more and 950 kg/m 3 or less,
ratio (Mw/Mn) of weight-average molecular weight to number-average molecular weight: 7.3 or more,
Component (B): ethylene-α-olefin copolymer,
density: 890 kg/m 3 or more and 930 kg/m 3 or less,
MFR: 0.5 g/10 min or more and 5.0 g/10 min or less,
MFRR: 10 or more and 30 or less.
8. An ethylene-based resin composition produced by the method according to claim 7 .
9. A method for producing the film according to claim 6 having an ethylene-based resin layer, the method comprising:
a step 1 below, a step 2 below, and a step 3 below:
<Step 1>
a step of melt-kneading 50 mass % or more and 90 mass % or less of a component (A) below and 10 mass % or more and 50 mass % or less of a component (B) below with respect to 100 mass % of a total mass of the component (A) and the component (B) to provide an ethylene-based modifier,
<Step 2>
a step of melt-kneading the ethylene-based modifier obtained in the step 1 and the component (B) to provide an ethylene-based resin composition, wherein the ethylene-based resin composition contains 15 mass % or more and 45 mass % or less of the component (A) with respect to 100 mass % of a total mass of the ethylene-based resin composition,
<Step 3>
a step of forming a film having an ethylene-based resin layer by a cast film process using the ethylene-based resin composition obtained in the step 2,
Component (A): ethylene-α-olefin copolymer,
density: 915 kg/m 3 or more and 950 kg/m 3 or less,
ratio (Mw/Mn) of weight-average molecular weight to number-average molecular weight: 7.3 or more,
Component (B): ethylene-α-olefin copolymer,
density: 890 kg/m 3 or more and 930 kg/m 3 or less,
MFR: 0.5 g/10 min or more and 5.0 g/10 min or less,
MFRR: 10 or more and 30 or less.
10. A film produced by the method according to claim 9 .