# US 11,306,198 B2 · Polypropylene composition and molded article

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- Number: US 11,306,198 B2
- Document ID: US11306198B2
- Status: Granted
- Kind: B2
- Application number: 16/981,092
- Filed: 2019-03-15
- Published: 2020-12-31
- Granted: 2022-04-19
- Earliest claimed: 2018-03-16
- Assignees: Basell Poliolefine Italia S.r.l.
- Applicants: Basell Poliolefine Italia S.R.L.
- Inventors: Takeshi Tsukahara; Nobuyuki Tsurumi; Shitoshi Kanno; Kunio Yamamoto; Takeshi Nakajima
- Web page: https://patentgrep.com/patent/US11306198B2

## CPC

- C08F 210/06: Propene
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A polypropylene composition made from or containing (i) component (1) made from or containing a propylene/ethylene copolymer containing 2 to 4% by weight of an ethylene-derived unit, based upon the total weight of the propylene/ethylene copolymer; and (ii) component (2) made from or containing an ethylene/propylene copolymer containing 65 to 87% by weight of an ethylene-derived unit, based upon the total weight of the ethylene/propylene copolymer; wherein the polypropylene composition has 1) a weight ratio of component (1) to component (2) in the range of 65:35 to 77:23, 2) an intrinsic viscosity of xylene solubles (XSIV) in the range of 0.8 to 1.4 dl/g, 3) a MFR (at 230° C. under a load of 2.16 kg) in the range of 15 to 40 g/10 min., and 4) the absence of a crystal nucleating agent.

## Claims

### Claim 1

A polypropylene composition comprising:
(i) component (1) comprising a propylene/ethylene copolymer containing 2 to 4% by weight of an ethylene-derived unit, based upon the total weight of the propylene/ethylene copolymer; and
(ii) component (2) comprising an ethylene/propylene copolymer containing 65 to 87% by weight of an ethylene-derived unit, based upon the total weight of the ethylene/propylene copolymer;
wherein the polypropylene composition has:
1) a weight ratio of component (1) to component (2) in the range of 65:35 to 77:23,
2) an intrinsic viscosity of xylene solubles (XSIV) in the range of 0.8 to 1.4 dl/g,
3) a MFR (at 230° C. under a load of 2.16 kg) in the range of 15 to 40 g/10 min.,
4) the absence of a crystal nucleating agent, and
5) a flexural modulus from 500 to 790 MPa.

### Claim 2 (depends on 1)

The polypropylene composition according to claim 1, wherein components (1) and (2) are copolymers obtained by polymerizing propylene and ethylene using a catalyst comprising:
(a) a solid catalyst comprising magnesium, titanium, a halogen, and an electron donor compound selected from succinate-based compounds, and
(b) an organoaluminum compound, and
(c) optionally an external electron donor compound.

### Claim 3 (depends on 1)

An injection-molded article comprising the polypropylene composition according to claim 1.