US 2020/0399454 A1 · PROPYLENE-BASED BLOCK COPOLYMER, PRODUCTION METHOD THEREFOR, AND SOLID TITANIUM CATALYST INGREDIENT FOR OLEFIN POLYMERIZATION

Abstract

The purpose of the present invention is to provide a propylene-based block copolymer, the deposition thereof on the inner wall of the polymerization vessel having been sufficiently inhibited. The propylene-based block copolymer of the present invention has a flowability evaluation value of 40% or less, the value being calculated with the following equation wherein X (sec) is the number of seconds over which 100 g of the copolymer having ordinary temperature falls from a stainless-steel funnel having an inner diameter of 11.9 mm and Y (sec) is the number of seconds over which 100 g of the copolymer which has been held at 80° C. for 24 hours under a load of 10 kg falls from the funnel having an inner diameter of 11.9 mm. Flowability evaluation value (%)={(Y/X)−1}×100.

Claims8

Dependent claims

A propylene block copolymer having an evaluated flowability value of 40% or less,

the evaluated flowability value being calculated by the following formula:
Evaluated flowability value (%)={(Y/X)−1}×100
where X (sec) is the number of seconds required for 100 g of the copolymer at normal temperature to fall through a stainless steel funnel having an inner diameter of 11.9 mm, and
Y (sec) is the number of seconds required for 100 g of the copolymer after being held at 80° C. for 24 hours under a load of 10 kg to fall through the funnel having an inner diameter of 11.9 mm.

1 more element

A method for producing a propylene block copolymer, the method comprising:

a first polymerization step of preparing a crystalline propylene (co)polymer by polymerizing propylene and an optional α-olefin in the presence of a solid titanium catalyst component (i) produced by bringing
a solid compound (S) containing a magnesium compound (II-0) and having a first pore distribution index of 2 or more and a second pore distribution index of more than 0.5,
the first pore distribution index being represented by formula I:
First pore distribution index=x/y (I)
where x is a cumulative pore volume of pores with a size of 0.001 to 0.1 μm, and y is a cumulative pore volume of pores with a size of 0.1 to 1.0 μm, the cumulative pore volumes being measured with a mercury porosimeter,
the second pore distribution index being represented by formula I′:
Second pore distribution index=xα/xβ (I′)
where xα is a cumulative pore volume of pores with a size of 0.01 to 0.1 μm, and xβ is a cumulative pore volume of pores with a size of 0.001 to 1.0 μm, the cumulative pore volumes being measured with a mercury porosimeter,
a titanium compound represented by formula IV:
Ti(OR)gX4-g (IV)
where R is a hydrocarbon group, X is a halogen atom, and g is an integer satisfying 0≤g≤4, and
an electron donor
into contact with each other;
and
a second polymerization step of polymerizing the crystalline propylene (co)polymer prepared in the first polymerization step and a raw material of a polymer selected from the group consisting of rubber components, amorphous or low-crystallinity ethylene.propylene copolymers (EPR), and amorphous ethylene.α-olefin copolymers.

12 more elements

Dependencies are inferred from the claim text.

Propylene-based block copolymer, production method therefor, and solid titanium catalyst ingredient for olefin polymerization

Life of this patent

Propylene-based block copolymer, production method therefor, and solid titanium catalyst ingredient for olefin polymerization

Life of this patent

Abstract

Claims8