Method of storing antioxidant mixture
AssigneeSumitomo Chemical Company, Limited
InventorsMasaki ITO, Katsumi SAKAKIBARA
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Abstract
Provided is a method of storing an antioxidant mixture for producing a more thermally stable polymer. A method of storing an antioxidant mixture, comprising storing an antioxidant mixture containing an antioxidant and an aluminum compound under a condition at a gauge pressure of 0.21 MPa or higher.
Claims12
A method of storing an antioxidant mixture, comprising storing an antioxidant mixture containing an antioxidant and an aluminum compound under a condition at a gauge pressure of 0.21 MPa or higher.
A composition comprising an olefin-based polymer and an antioxidant, wherein when a torque value of the composition is measured under <kneading evaluation conditions> below, a time required for the torque value to decrease by 15% from the torque value at 5 minutes after the start of kneading is 20 minutes or more, and wherein
- an amount of the antioxidant containing an ester group detected when a tetrahydrofuran extract of the composition before kneading evaluation is analyzed by high-performance liquid chromatography is 100 wtppm or less based on a total weight of the olefin-based polymer,
- the <kneading evaluation conditions>:
- apparatus:
- a tabletop co-directional biaxial kneader with a conical screw having a screw length of 1725 mm;
- temperature:
- 200° C.;
- screw rotation speed:
- 100 rpm;
- and
- under an atmosphere.
Dependencies are inferred from the claim text.