# US 2017/0253701 A1 · Comb-Star Viscosity Modifier and Its Compositions

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- Number: US 2017/0253701 A1
- Document ID: US20170253701A1
- Status: Published application
- Kind: A1
- Application number: 14/898,908
- Filed: 2014-06-30
- Published: 2017-09-07
- Earliest claimed: 2013-07-31
- Assignees: ExxonMobile Chemical Patents Inc.
- Applicants: Exxonmobil Chemical Patents Inc.
- Inventors: Andy H. Tsou; Donna J. Crowther; Man Kit Ng; Tabassumul Haque; Hong Cheng; Patrick Brant; Martin N. Webster; Yong Yang; Liehpao O. Farng; Rahul R. Kulkarni
- Web page: https://patentgrep.com/patent/US20170253701A1

## CPC

- C08G 77/442: containing vinyl polymer sequences
- C08F 283/12: on to polysiloxanes
- C08F 290/06: Polymers provided for in subclass C08G
- C08L 83/10: Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00)
- C08G 77/28: sulfur-containing groups
- C08G 77/392: containing sulfur
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Described herein is a comb-star poly(siloxane-polyolefin) comprising the reaction product of at least vinyl-terminated macromer and functional-poly(dialkylsiloxanes) comprising 2 or more functional groups, wherein the comb-star poly(siloxane-polyolefin) has the following features: a g′(vis avg) of less than 0.80; a comb number of 2 or 3 or 4 to 30 or 40 or 50 or 100 or more; and a number average molecular weight (Mn) within the range of from 25,000 g/mole to 500,000 g/mole.

## Claims

### Claim 1

A comb-star poly(siloxane-polyolefin) comprising the reaction product of at least vinyl-terminated macromer and functional-poly(dialkylsiloxanes) comprising compounds of the following formula:
wherein n and m are integers from 2 to 200; each of R1, R2 and R3 are independently selected from C1 to C20 alkyls; and X is a functional group capable of facilitating the formation of a bond between the vinyl group of the vinyl-terminated macromer and a silicon atom; and
wherein the comb-star poly(siloxane-polyolefin) has the following features:
a g′(vis avg) of less than 0.80;
a comb number of 2 or more; and
a number average molecular weight (Mn) within the range of from 25,000 g/mole to 500,000 g/mole.

### Claim 2

A comb-star poly(siloxane-polyolefin), wherein the poly(siloxane-polyolefin) is a mixture of polymers having the general structure:
wherein “PO” is the vinyl-terminated macromer portion of the reaction product; each R1, R2 and R3 is independently selected from C1 to C20 alkyls; and n and m are integers from 2 to 200.

### Claim 3 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein n is within the range from 2 to 10.

### Claim 4 (depends on 3)

The comb-star poly(siloxane-polyolefin) of claim 3, wherein X is hydride or a mercaptan selected from the group consisting of methyl, ethyl, propyl and butyl mercaptans.

### Claim 5 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein the residual functional groups on the silicon atoms, preferably silanes, is less than 1 mole %, preferably less than 0.5 mole %, most preferably less than 0.1 mole % relative to the original functional-poly(dialkylsiloxanes).

### Claim 6 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein the number average molecular weight (Mn) of the functional-poly(dialkylsiloxane) is within the range from 500 g/mole to 50,000 g/mole.

### Claim 7 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein the comb-star poly(siloxane-polyolefin) has a g′(z avg) of less than 0.70.

### Claim 8 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein the comb-star poly(siloxane-polyolefin) has a weight average molecular weight (Mw) to number average molecular weight (Mn) ratio (Mw/Mn) within the range from 2.0 to 6.0.

### Claim 9 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein the comb-star poly(siloxane-polyolefin) is additionally the reaction product of a C2 to C20 alkene.

### Claim 10 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein the glass transition temperature (Tg) of the vinyl-terminated macromer is preferably less than 0° C.

### Claim 11 (depends on 1)

The comb-star poly(siloxane-polyolefin) of claim 1, wherein the comb-star poly(siloxane-polyolefin) is a mixture of polymers having the general structure:
wherein “PO” is the vinyl-terminated macromer portion of the reaction product; each R1, R2 and R3 is independently selected from C1 to C20 alkyls; and n and m are integers from 2 to 200.

### Claim 12 (depends on 11)

The comb-star poly(siloxane-polyolefin) of claim 11, wherein the ratio of m/n is greater than 1; or preferably, wherein m/n is within a range of from 2 to 12.

### Claim 13 (depends on 1)

A viscosity modified base stock comprising the poly(siloxane-polyolefin) of claim 1 and a lubricant base stock of Group I, Group II, Group III, Group IV, and Group V.

### Claim 14 (depends on 13)

The viscosity modified base stock of claim 13, wherein the poly(siloxane-polyolefin) is present in the base stock at a level within the range of from 0.05 wt % to 5 wt % of the combination of base stock and poly(siloxane-polyolefin).

### Claim 15 (depends on 14)

The viscosity modified base stock of claim 14, wherein as the temperature of the modified base stock increases, the hydrodynamic radius of the poly(siloxane-polyolefin) increases; wherein the radius increases by at least 2 nm for every 80° C. or more increase in temperature.

### Claim 16 (depends on 2)

The comb-star poly(siloxane-polyolefin) of claim 2, wherein the number average molecular weight (Mn) of the functional-poly(dialkylsiloxane) is within the range from 500 g/mole to 50,000 g/mole.

### Claim 17 (depends on 2)

The comb-star poly(siloxane-polyolefin) of claim 2, wherein the comb-star poly(siloxane-polyolefin) has a g′(z avg) of less than 0.70.

### Claim 18 (depends on 2)

The comb-star poly(siloxane-polyolefin) of claim 2, wherein the comb-star poly(siloxane-polyolefin) has a weight average molecular weight (Mw) to number average molecular weight (Mn) ratio (Mw/Mn) within the range from 2.0 to 6.0.

### Claim 19 (depends on 2)

The comb-star poly(siloxane-polyolefin) of claim 2, wherein the comb-star poly(siloxane-polyolefin) is additionally the reaction product of a C2 to C20 alkene.

### Claim 20 (depends on 2)

The comb-star poly(siloxane-polyolefin) of claim 2, wherein the glass transition temperature (Tg) of the vinyl-terminated macromer is preferably less than 0° C.

### Claim 21 (depends on 2)

The comb-star poly(siloxane-polyolefin) of claim 2, wherein n is within the range from 2 to 10.