# US 11,999,813 B2 · Propylene butene copolymer

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- Number: US 11,999,813 B2
- Document ID: US11999813B2
- Status: Granted
- Kind: B2
- Application number: 17/292,066
- Filed: 2019-11-14
- Published: 2021-12-23
- Granted: 2024-06-04
- Earliest claimed: 2018-11-15
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Jingbo Wang; Markus Gahleitner; Klaus Bernreitner; Pauli Leskinen; Matthias Hoff
- Web page: https://patentgrep.com/patent/US11999813B2

## CPC

- C08F 297/083: {the monomers being ethylene or propylene}
- C08J 5/18: Manufacture of films or sheets
- C08F 4/65908: {in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+}
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 210/06: Propene
- C08F 210/08: Butenes
- C08F 2420/00: Metallocene catalysts
- C08F 2420/07: Heteroatom-substituted Cp, i.e. Cp or analog where at least one of the substituent of the Cp or analog ring is or contains a heteroatom
- C08J 2323/14: Copolymers of propene (C08J2323/16 takes precedence)
- C08J 2353/00: Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J 2423/14: Copolymers of propene (C08J2423/16 takes precedence)
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 23/20: having four to nine carbon atoms
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2308/00: Chemical blending or stepwise polymerisation process with the same catalyst
- C08L 2314/06: Metallocene or single site catalysts
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The invention provides a multimodal propylene butene random copolymer having a melt flow rate (MFR2) of 1.0 to 20.0 g/10 min and a butene content of 5.0 to 20.0 wt %, wherein said copolymer is prepared using a single site catalyst and wherein said copolymer comprises: (i) 30 to 70 wt % of a propylene butene copolymer (A) having an MFR2 of 0.5 to 20.0 g/10 min and a butene content of 2.0 to 10.0 wt %; and (ii) 70 to 30 wt % of a propylene butene copolymer (B) having an MFR2 of 0.5 to 20.0 g/10 min and a butene content of 4.0 to 20.0 wt %; wherein copolymers (A) and (B) are different.

## Claims

### Claim 1

A multimodal propylene butene random copolymer having a melt flow rate (MFR2) of 1.0 to 20.0 g/10 min when determined under 2.16 kg load at 230° C. and a butene content of 5.0 to 20.0 wt %, wherein said copolymer is prepared using a single site catalyst and wherein said copolymer comprises:
(i) 30 to 70 wt % of a propylene butene copolymer (A) having an MFR2 of 0.5 to 20.0 g/10 min when determined under 2.16 kg load at 230° C. and a butene content of 2.0 to 10.0 wt %; and
(ii) 70 to 30 wt % of a propylene butene copolymer (B) having an MFR2 of 0.5 to 20.0 g/10 min when determined under 2.16 kg load at 230° C. and a butene content of 4.0 to 20.0 wt %;
wherein copolymers (A) and (B) are different, wherein said multimodal copolymer is substantially free of ethylene.

### Claim 2 (depends on 1)

The multimodal propylene butene random copolymer as claimed in claim 1, wherein said single site catalyst is a metallocene catalyst.

### Claim 3 (depends on 1)

The multimodal propylene butene random copolymer as claimed in claim 1, wherein the butene content of said multimodal copolymer is in the range 6.0 to 16.0 wt %.

### Claim 4 (depends on 1)

The multimodal propylene butene random copolymer as claimed in claim 1, wherein a xylene soluble fraction is less than 10.0 wt % when determined at 25° C.

### Claim 5 (depends on 1)

The multimodal propylene butene random copolymer as claimed in claim 1, wherein said multimodal copolymer has a flexural modulus of at least 750 MPa.

### Claim 6 (depends on 1)

The multimodal propylene butene random copolymer as claimed in claim 1, wherein said multimodal copolymer has a molecular weight distribution (Mw/Mn) of less than 4.5.

### Claim 7 (depends on 1)

The multimodal propylene butene random copolymer as claimed in claim 1, wherein the MFR2 of the multimodal copolymer is in the range 4.0 to 12.0 g/10 min when determined under 2.16 kg load at 230° C.

### Claim 8 (depends on 1)

An article comprising the multimodal propylene butene copolymer as defined in claim 1.

### Claim 9 (depends on 8)

The article as claimed in claim 8, wherein said article is a film.

### Claim 10 (depends on 9)

The article of claim 9, wherein the film is a monolayer film.

### Claim 11 (depends on 1)

A process for the preparation of the multimodal propylene butene random copolymer as defined in claim 1, said process comprising:
(i) polymerising propylene and butene in a first polymerisation stage in the presence of a single site catalyst to prepare a first propylene butene copolymer having a MFR2 from 0.5 to 20.0 g/10 min when determined under 2.16 kg load at 230° C. and a butene content of 2.0 to 10.0 wt %;
(ii) polymerising propylene and butene in a second polymerisation stage in the presence of said catalyst and said first propylene butene copolymer to prepare said multimodal propylene butene copolymer.

### Claim 12 (depends on 11)

The process as claimed in claim 11, wherein the first polymerisation stage is carried out in a loop reactor and the second polymerisation stage is carried out in a gas phase reactor.