Branched polyethylenes by hydrosilation grafting to improve processability of polyethylene

Patent metadata

Field	Value
Publication number	US-9527933-B2
Application number	US-201314031348-A
Country	US
Kind code	B2
Filing date	Sep 19, 2013
Priority date	Sep 24, 2012
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

This invention relates to blends of polyalphaolefins (PAOs) and polyhydrosilane-modified polyolefins, methods to prepare the blends and methods to prepare polyhydrosilane-modified polyolefins.

First claim

What is claimed is:

1. A process to prepare a modified polyolefin comprising the steps of:
(i) contacting a non-metallocene catalyst, a hydrosilylation modifier, and one or more vinyl terminated polyolefins selected from a vinyl terminated polyalphaolefin and a vinyl terminated macromonomer;
wherein when the vinyl terminated polyolefin is a vinyl terminated macromonomer, the hydrosilylation modifier is represented by one of more of the formulae:

 and
wherein when the vinyl terminated polyolefin is a vinyl terminated polyalphaolefin, the hydrosilylation modifier is represented by the formula:

wherein R 1 is hydrogen, Z′, or a C 1 to a C 20 substituted or unsubstituted hydrocarbyl group; and wherein Z′ is a group represented by the formula:

each R 2 , R 3 , R 4 , and R 5 , independently, is a H, or a C 1 to a C 20 substituted or unsubstituted hydrocarbyl group, where R 2 and R 3 and/or R 4 and R 5 may form a cyclic structure with Si;
each L, L 1 , L 2 , and L 3 , independently, is a bond or a linking group;
m is 1 to 1000;
n is 1 to 1000;
o is 0 to 1000;
each of X 1 and X 2 , independently, is hydrogen or a C 1 to a C 20 substituted or unsubstituted hydrocarbyl group;
wherein the vinyl terminated polyolefin is a substituted or unsubstituted hydrocarbyl group having from 20 to about 10,000 carbon atoms and at least 5% allyl chain ends; and

(ii) obtaining a modified polyolefin;
(iii) adding a polymer; and
(iv) obtaining a blend comprising the modified polyolefin;
wherein the amount of modified polyolefin is from about 0.5 wt % to about 10 wt %, based on the total weight of the blend.

2. The process of claim 1 , wherein the polymer from step (iii) is added during step (i).

3. The process of claim 1 , wherein the vinyl terminated macromonomer has the following properties:
a Mn of at least 200 g/mol, measured by 1 H NMR, comprising of one or more C 4 to C 40 higher olefin derived units, where the higher olefin polymer comprises substantially no propylene derived units; and wherein the higher olefin polymer has at least 5% allyl chain ends.

4. The process of claim 1 , wherein each L 1 , L 2 , and L 3 , independently, is O, S, NR A , PR B , SiR C 2 , or a C 1 to a C 20 substituted or unsubstituted hydrocarbyl group;
wherein each R A , R B , and R C , independently, is hydrogen, or a C 1 to a C 20 substituted or unsubstituted hydrocarbyl group.

5. The process of claim 1 , wherein each L 1 , L 2 , and L 3 , independently, is O.

6. The process of claim 1 , wherein the process is carried out in the melt phase.

7. The process of claim 1 , wherein the non-metallocene catalyst is one or more of: chloroplatinic acid, platinum complexes, rhodium complexes, peroxides, Ziegler Natta catalysts, and iridium, cobalt, ruthenium, osmium, nickel, and palladium complexes.

8. The process of claim 1 , wherein the vinyl terminated polyalphaolefin of step (i) is ethylene-based.

9. The process of claim 8 , wherein the vinyl terminated ethylene-based polyalphaolefin is made using a metallocene catalyst system comprising an ionizing activator and a metallocene compound represented by the following structure:

10. The process of claim 9 , wherein the ionizing activator is dimethylaniliniumtetrakis(perfluoronaphthyl)borate.

11. The process of claim 1 , wherein the vinyl terminated polyalphaolefin of step (i) is vinyl terminated polyethylene.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Kulkarni Rahul R
• Shirodkar Pradeep P
• Cheng Jianya
• Crowther Donna J

Classifications

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• C08F4/80 Primary

  selected from iron group metals or platinum group metals · CPC title

• C08F8/42

  Introducing metal atoms or metal-containing groups · CPC title

• C08F10/02 Primary

  Ethene · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title