Polyolefin Adhesive Compositions and Methods of Preparing the Same

Patent metadata

Field	Value
Publication number	US-2016115306-A1
Application number	US-201614991720-A
Country	US
Kind code	A1
Filing date	Jan 8, 2016
Priority date	Jun 17, 2011
Publication date	Apr 28, 2016
Grant date	—

Abstract

A blended multimodal polymer product is disclosed that comprises a first polymer, wherein the first polymer is a homopolymer of propylene or a propylene copolymer having an ethylene or a C 4 to C 10 olefin comonomer; and a second polymer, wherein the second polymer is a propylene homopolymer and a propylene copolymer having an ethylene or a C 4 to C 10 olefin comonomer, and wherein the first polymer and second polymer have a difference in heat of fusion of about 25 J/g or more. Methods for making such a polymer product using at least two reactors in parallel and for separating a propylene-based polymer from a solvent using a liquid-phase separator are also disclosed.

First claim

1 .- 25 . (canceled)

26 . A method of making a multimodal polymer product comprising:
producing a first polymer in a first reactor, wherein the first polymer is a propylene homopolymer or a propylene copolymer having an ethylene or a C 4 to C 10 olefin comonomer, and wherein the crystallization temperature of the first polymer is less than about 40° C.; producing a second polymer in a second reactor in parallel with the first reactor, wherein the second polymer is a propylene homopolymer or a propylene copolymer having an ethylene or a C 4 to C 10 olefin comonomer, and wherein the first polymer and second polymer have a difference in heat of fusion of about 25 J/g or more, and wherein the crystallization temperature of the second polymer is greater than about 50° C.; combining the first polymer and the second polymer to form a multimodal polymer blend; and pelletizing the multimodal polymer blend to form a plurality of pellets comprising the multimodal polymer blend.

27 . The method of claim 26 , wherein the difference in heat of fusion between the first polymer, and second polymer is about 30 J/g or more.

28 . The method of claim 27 , wherein the first polymer has a heat of fusion of about 60 J/g or more, and the second polymer has a heat of fusion of about 30 J/g or less.

29 . The method of claim 28 , wherein the first polymer has a heat of fusion of about 65 J/g to about 85 J/g, and the second polymer has a heat of fusion of about 10 J/g to about 20 J/g.

30 . The method of claim 27 , wherein the first polymer has a heat of fusion of about 80 J/g or more, and the second polymer has a heat of fusion of about 50 J/g or less.

31 . The method of claim 27 , wherein the first polymer has a heat of fusion of about 50 J/g or more, and the second polymer has a heat of fusion of about 15 J/g or less.

32 . The method of claim 26 , further comprising:
providing a vessel having an inlet and an outlet;
after combining the first polymer and the second polymer to form the multimodal polymer blend and prior to pelletizing the multimodal polymer blend, introducing a first polymer composition comprising the multimodal polymer blend and a solvent into the inlet of the vessel;
subjecting first polymer composition to a vacuum in the vessel such that at least a portion of the solvent is removed from the first polymer composition and the temperature of the first polymer composition is reduced, thereby forming a second polymer composition comprising the multimodal polymer blend and having a lower solvent content and a lower temperature than the first polymer composition; and
discharging the second polymer composition from the outlet of the vessel.

33 . The method of claim 26 , further comprising:
providing a liquid-phase separator having an inlet, a solvent outlet, and a product outlet; introducing the multimodal polymer blend and a solvent into the liquid-phase separator through the inlet; operating the liquid-phase separator under conditions suitable to produce a polymer lean liquid phase and a polymer rich liquid phase; removing a portion of the solvent from the liquid-phase separator via the solvent outlet; and discharging the polymer rich phase from the liquid-phase separator via the product outlet.

34 . The method of claim 26 , further comprising:
introducing a first unsupported catalyst into the first reactor; and introducing a second unsupported catalyst into the second reactor, wherein the first unsupported catalyst is different than the second unsupported catalyst.

35 . The method of claim 26 , further comprising:
introducing a first unsupported catalyst into the first reactor; and introducing a second unsupported catalyst into the second reactor, wherein the first unsupported catalyst is the same as the second unsupported catalyst.

36 . The method of claim 34 , wherein the first unsupported catalyst is selected from the group consisting of:
dimethylsilyl bis(2-methyl-5-phenylindenyl)zirconium dichloride; dimethylsilyl bis(2-methyl-5-phenylindenyl)zirconium dimethyl; dimethylsilyl bis(2-methyl-5-phenylindenyl)hafnium dimethyl; dimethylsilyl bis(2-methyl-5-phenylindenyl)hafnium dichloride; dimethylsilylbis(indenyl)hafnium dimethyl; dimethylsilylbis(indenyl)hafnium dichloride; dimethylsilylbis(indenyl)zirconium dichloride; and dimethylsilylbis(indenyl)zirconium dichloride.

37 . The method of claim 35 , wherein the second unsupported catalyst is selected from the group consisting of:
dimethylsilyl bis(2-methyl-5-phenylindenyl)zirconium dichloride; dimethylsilyl bis(2-methyl-5-phenylindenyl)zirconium dimethyl; dimethylsilyl bis(2-methyl-5-phenylindenyl)hafnium dimethyl; dimethylsilyl bis(2-methyl-5-phenylindenyl)hafnium dichloride; dimethylsilylbis(indenyl)hafnium dimethyl; dimethylsilylbis(indenyl)hafnium dichloride; dimethylsilylbis(indenyl)zirconium dichloride; dimethylsilylbis(indenyl)zirconium dichloride; 1,1′-bis(4-triethylsilylphenyl)methylene-(cyclopentadienyl)(2,7-di-tertiary-butyl-9-fluorenyl)hafnium dimethyl; 1,1′-bis(4-triethylsilylphenyl)methylene-(cyclopentadienyl)(2,7-di-tertiary-butyl-9-fluorenyl)hafnium dichloride; 1,1′-bis(4-triethylsilylphenyl)methylene-(cyclopentadienyl)(2,7-di-tertiary-butyl-9-fluorenyl)zirconium dichloride; and 1,1′-bis(4-triethylsilylphenyl)methylene-(cyclopentadienyl)(2,7-di-tertiary-butyl-9-fluorenyl)zirconium dimethyl.

38 . The method of claim 26 , wherein the first polymer is a copolymer of propylene and ethylene.

39 . The method of claim 38 , wherein the second polymer is a copolymer of propylene and ethylene.

40 . The method of claim 26 , wherein the first polymer has a melt viscosity of about 2000 cP or less.

41 . The method of claim 40 , wherein the first polymer has a melt viscosity of about 1000 cP or less.

42 . The method of claim 26 , wherein the second polymer has a melt viscosity of about 2000 cP or less.

43 . The method of claim 40 , wherein the second polymer has a melt viscosity of about 2000 cP to 20,000 cP.

44 . The method of claim 26 , wherein the first polymer is about 10 wt % to about 90 wt % of the multimodal polymer blend.

45 . The method of claim 44 , wherein the second polymer is about 10 wt % to about 90 wt % of the multimodal polymer blend.

Assignees

• Exxonmobil Chem Patents Inc

Inventors

• Ravishankar Periagaram S
• Wang Yu Feng
• Stephens Luke P
• Barsan Florin
• Berti Douglas A

Classifications

• C09J123/10 Primary

  Homopolymers or copolymers of propene · CPC title

• C08L23/10 Primary

  Homopolymers or copolymers of propene · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L23/12

  Polypropene · CPC title

• C09J123/12

  Polypropene · CPC title