# US 8,835,587 B2 · Catalyst system, process for olefin polymerization, and polymer compositions produced therefrom

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- Number: US 8,835,587 B2
- Document ID: US8835587B2
- Status: Granted
- Kind: B2
- Application number: 14/049,558
- Filed: 2013-10-09
- Published: 2014-02-06
- Granted: 2014-09-16
- Earliest claimed: 2009-08-14
- Assignees: ExxonMobil Chemical Patents Inc.
- Applicants: ExxonMobil Chemical Patents Inc.
- Inventors: Donna J. Crowthers; Peijun Jiang; Rainer Kolb
- Web page: https://patentgrep.com/patent/US8835587B2

## CPC

- C08F 210/06: Propene
- B01J 31/0239: {Quaternary ammonium compounds}
- B01J 31/146: {of boron}
- B01J 31/1616: {Coordination complexes, e.g. organometallic complexes, immobilised on an inorganic support, e.g. ship-in-a-bottle type catalysts (catalysts comprising molecular sieves B01J29/00)}
- B01J 31/2295: {Cyclic compounds, e.g. cyclopentadienyls}
- C08F 10/06: Propene
- C08F 210/02: Ethene
- C08F 210/16: Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- B01J 31/0201: {Oxygen-containing compounds}
- B01J 31/0235: {Nitrogen containing compounds}
- B01J 31/0254: {on mineral substrates}
- B01J 31/0255: {Phosphorus containing compounds}
- B01J 31/1608: {the ligands containing silicon}
- B01J 2231/122: Cationic (co)polymerisation, e.g. single-site or Ziegler-Natta type
- B01J 2531/0269: Complexes comprising ligands derived from the natural chiral pool or otherwise having a characteristic structure or geometry
- B01J 2531/0297: Non-coordinating anions
- B01J 2531/40: Complexes comprising metals of Group IV (IVA or IVB) as the central metal
- B01J 2531/48: Zirconium
- B01J 2531/49: Hafnium
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 4/65916: {supported on a carrier, e.g. silica, MgCl2, polymer}
- C08F 4/65927: {two cyclopentadienyl rings being mutually bridged}
- C08F 110/06: Propene
- Y10S 526/943: Polymerization with metallocene catalysts
- Y10T 442/60: Nonwoven fabric [i.e., nonwoven strand or fiber material]
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are catalyst systems, processes for polymerizing one or more olefins, polymers resulting therefrom, and articles prepared from such polymers. The processes comprise contacting under polymerization conditions one or more olefin monomers, preferably propylene, with a catalyst system comprising a transition metal compound and an activator of the formula (1) or (2) as described herein. The polymer compositions described herein exhibit advantageously narrow composition distributions and high melting points in comparison to conventional polymers having the same comonomer content. The polymers described herein exhibit improved properties, e.g., pellet stability, impact properties, heat seal properties, and structural integrity in film and fabricated parts applications.

## Claims

### Claim 1

A copolymer composition comprising units derived from propylene and ethylene, where the copolymer comprises from about 0.1 to about 20 wt % units derived from ethylene, and:
i. the density of the copolymer composition is less than about 0.970 g/cc,
ii. the heat of fusion of the copolymer composition is less than about 75 J/g,
iii. the melting point of the composition satisfies the relation Tm>−6.2*e+125, where e is the ethylene content of the composition in wt % and Tm is the melting point in degrees Celsius,
iv. the copolymer is prepared using one or more metallocene catalysts, and
v. the copolymer composition has a T75−T25 value of less than 20, where T25 is the temperature in degrees Celsius at which 25% of the eluted polymer is obtained and T75 is the temperature in degrees Celsius at which 75% of the eluted polymer is obtained via temperature rising elution fractionation (TREF).

### Claim 2 (depends on 1)

The copolymer composition of claim 1, wherein the copolymer comprises from about 2 to about 20 wt % units derived from ethylene.

### Claim 3 (depends on 2)

The copolymer composition of claim 2, wherein the composition comprises from about 3 to about 16 wt % units derived from ethylene.

### Claim 4 (depends on 3)

The copolymer composition of claim 3, wherein the composition comprises from about 5 to about 14 wt % units derived from ethylene.

### Claim 5 (depends on 1)

The copolymer composition of claim 1, wherein the density of the composition is less than about 0.940 g/cc.

### Claim 6 (depends on 5)

The copolymer composition of claim 5, wherein the density of the composition is from about 0.860 to about 0.900 g/cc.

### Claim 7 (depends on 1)

The copolymer composition of claim 1, wherein the molecular weight of the copolymer is from about 20,000 to about 400,000 g/mol.

### Claim 8 (depends on 1)

The copolymer composition of claim 1, wherein the molecular weight distribution of the copolymer is from about 2.0 to about 2.4.

### Claim 9 (depends on 1)

The copolymer composition of claim 1, wherein the soluble fraction, Fa, of the copolymer satisfies the following relation:
Fa<7*e+35,
where e is the ethylene content of the composition in wt %,
where the soluble fraction, Fa, is measured at −15° C. in a solution of orthodichlorbenzene.

### Claim 10 (depends on 1)

The copolymer composition of claim 1, wherein the soluble fraction, Fa, of the copolymer satisfies the following relation:
Fa<7*e+38,
where e is the ethylene content of the composition in wt %,
where the soluble fraction, Fa, is measured at −15° C. in a solution of orthodichlorbenzene.

### Claim 11 (depends on 1)

The copolymer composition of claim 1, wherein the soluble fraction, Fa, of the copolymer satisfies the following relation:
Fa<7*e+40,
where e is the ethylene content of the composition in wt %,
where the soluble fraction, Fa, is measured at −15° C. in a solution of orthodichlorbenzene.

### Claim 12 (depends on 1)

An article comprising the copolymer composition of claim 1.

### Claim 13 (depends on 12)

The article of claim 12, where the article is a film, fiber, nonwoven fabric, or molded article.

### Claim 14 (depends on 1)

A polymer pellet comprising the copolymer composition of claim 1.