# US 8,569,412 B2 · Heterophasic polypropylene copolymer composition

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,569,412 B2
- Document ID: US8569412B2
- Status: Granted
- Kind: B2
- Application number: 13/261,048
- Filed: 2010-06-15
- Published: 2012-07-26
- Granted: 2013-10-29
- Earliest claimed: 2009-06-22
- Assignees: Borealis AG
- Applicants: Werner Posch; Michael Tranninger; Pauli Leskinen; Bo Malm; Sybille Simon; Norbert Reichelt
- Inventors: Werner Posch; Michael Tranninger; Pauli Leskinen; Bo Malm; Sybille Simon; Norbert Reichelt
- Web page: https://patentgrep.com/patent/US8569412B2

## CPC

- C08L 23/10: Homopolymers or copolymers of propene
- C08F 210/06: Propene
- C08F 297/08: polymerising mono-olefins
- B29C 45/0001: {characterised by the choice of material}
- C08F 110/06: Propene
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2207/02: Heterophasic composition
- C08L 2314/02: Ziegler natta catalyst
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

Heterophasic polypropylene composition comprising (A) 45 to 70 wt % of a propylene homo- or copolymer matrix with an MFR2 in accordance with ISO 1133 (230° C., 2.16 kg load) of ≧80 g/10 min and (B) 25 to 40 wt % of an elastomeric propylene-ethylene copolymer, having an intrinsic viscosity IV (ISO 1628, with decalin as solvent) of ≧3.3 dl/g and an ethylene content of 20 to 50 wt %, (C) 0-15 wt % of an elastomeric ethylene/alpha-olefin random copolymer (D) 3-25 parts per weight of inorganic filler, the heterophasic polypropylene compositions having a total MFR2 (230° C./2.16 kg) in accordance with ISO 1133 of ≧5 g/10 min, a Charpy notched impact strength according to ISO 179/1eA at +23° C. of ≧15.0 kJ/m2, preferably ≧25.0 kJ/m2, a minimum value for the Charpy notched impact strength according to ISO 179/1eA at −200 C of ≧7.0 kJ/m2, preferably ≧10.0 kJ/m2 and a tensile modulus according to ISO 527-3 of ≧1200 MPa; their preparation and use for producing injection molded articles being free of flow marks.

## Claims

### Claim 1

Process for the preparation of heterophasic polypropylene compositions, comprising the steps of:
producing a polypropylene polymer matrix (A) in the presence of a catalyst system comprising a Ziegler-Natta procatalyst in combination with an external donor and a cocatalyst in at least one slurry reactor
transferring the slurry reactor product into a first gas phase reactor (GPR),
(i) a Ziegler-Natta procatalyst which contains a trans-esterification product of a lower alcohol and a phthalic ester as internal donor and
(ii) an organometallic cocatalyst and
(iii) an external donor represented by formula (III)
Si(OCH2CH3)3(NR1R2)
wherein R1 and R2 can be the same or different a represent a hydrocarbon group having 1 to 12 carbon atoms
or formula (IV)
R3nR4mSi(OR6)z
wherein R3 and R4 are identical or different hydrocarbon residues, R5 is methyl or ethyl, z is 2 or 3; m is 0 or 1; n is 0 or 1; with the proviso that n+m+z=4,
said procatalyst being modified by polymerizing it with a vinyl compound of the formula CH2═CH—CHR6R7
wherein R6 and R7 together form a 5- or 6-membered saturated, unsaturated or aromatic ring or independently represent an alkyl group comprising 1 to 4 carbon atoms,
in the presence of the cocatalysts and the external donor,
wherein the slurry reactor product is further polymerized in the presence of the catalyst system in said first GPR
transferring the first GPR product into a 2nd GPR producing an ethylene/propylene-copolymer (B) in the polymer matrix (A) in the presence of the catalyst system in said 2nd GPR
transferring the 2nd GPR product into a 3rd GPR and further producing an ethylene/propylene-copolymer (B) in the polymer matrix (A) in the presence of the catalyst system in said 3rd GPR, said ethylene/propylene copolymers having the same composition ratios and
recovering the polymer product for further processing,
yielding a polypropylene polymer matrix (A) containing said ethylene/propylene copolymers (B) having the same composition ratios, respectively having same ethylene content and intrinsic viscosities, so that an unimodal rubber composition is obtained
adding (C) 0-15 wt % of an elastomeric ethylene/alpha-olefin random copolymer and (D) 3-25 parts per weight of inorganic filler.

### Claim 2 (depends on 1)

Process according to claim 1, wherein the catalyst system used comprises
(i) a Ziegler-Natta procatalyst which contains a trans-esterification product of a lower alcohol and a phthalic ester as internal donor and
(ii) an organometallic cocatalyst and
(iii) an external donor represented by formula (III)
Si(OCH2CH3)3(NR1R2)
wherein R1 and R2 can be the same or different a represent a hydrocarbon group having 1 to 12 carbon atoms
or formula (IV)
R3nR4mSi(OR5)z
wherein R3 and R4 are identical or different hydrocarbon residues, R5 is methyl or ethyl, z is 2 or 3; m is 0 or 1; n is 0 or 1; with the proviso that n+m+z=4,
said procatalyst being modified by polymerizing it with a vinyl compound of the formula CH2═CH—CHR6R7
wherein R6 and R7 together form a 5- or 6-membered saturated, unsaturated or aromatic ring or independently represent an alkyl group comprising 1 to 4 carbon atoms,
in the presence of the cocatalysts and the external donor.

### Claim 3 (depends on 2)

Process according to claim 2, wherein the vinyl compound used for modifying the procatalyst is vinyl cyclohexane.

### Claim 4 (depends on 2)

Process according to claim 2, wherein said z is 2.