# US 11,441,095 B2 · Use of polymeric additives for paraffin-containing fluids

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- Number: US 11,441,095 B2
- Document ID: US11441095B2
- Status: Granted
- Kind: B2
- Application number: 15/747,061
- Filed: 2016-07-22
- Published: 2018-12-27
- Granted: 2022-09-13
- Earliest claimed: 2015-07-23
- Assignees: Sasol Chemicals GmbH
- Applicants: Sasol Performance Chemicals GmbH
- Inventors: Oliver Herzog; Sabine Scherf; Michael Ruffmann; Wolfgang Breuer
- Web page: https://patentgrep.com/patent/US11441095B2

## CPC

- C10M 145/16: polycarboxylic
- C08F 212/08: Styrene
- C08F 222/14: Esters having no free carboxylic acid groups {, e.g. dialkyl maleates or fumarates}
- C10M 2209/086: polycarboxylic, e.g. maleic acid
- C10N 2030/02: Pour-point; Viscosity index
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

The present invention is concerned with the use of polymeric additives for paraffin-containing fluids as pour point depressants and low temperature flow improvers, wherein the polymers comprise styrene and maleic acid dialkyl ester building blocks.

## Claims

### Claim 1

A method for reducing the pour point of a paraffin-containing fluid, comprising adding to a paraffin-containing fluid a polymer comprising the following building blocks:
wherein
and —R2 are, independent from each other, a C12- to C36- alkyl group;
the alkyl groups being a mixture of branched and linear, the ratio of the linear alkyl groups to the branched alkyl groups is in the range from 95:5 to 5:95 (weight % : weight %),
at least 90% of the number of the building blocks are a) and b), relative to the total number of all building blocks incorporated in the polymer; and
the building blocks a) and b) are, relative to each other, present in the polymer in a ratio of from 80:20 to 20:80 (number:number);
wherein the paraffin-containing fluid is a crude oil, a petroleum oil, a shale oil, a tar sands oil, or mixtures thereof; and
wherein 20 to 2000 ppm (weight:weight) of the polymers are used in the paraffin-containing fluid.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the polymer consists of more than 98% of the building blocks a) and b).

### Claim 3 (depends on 1)

The method according to claim 1, wherein the branched alkyl groups are 2-alkyl-1-alkyl groups.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the branched to linear ratio of the alkyl chains is from 10:90 to 90:10 (weight % : weight %).

### Claim 5 (depends on 1)

The method according to claim 1, wherein the ratio of the number of building blocks a) and b) is from 75:25 to 50:50.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the polymers have an acid value of less than 2 mg KOH/g, measured according to DIN EN 14104.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the polymers comprise in total 50 to 150 building blocks a) and b) per polymer chain.

### Claim 8 (depends on 1)

The method according to claim 1, wherein 100 ppm to 2000 ppm (weight:weight) of the polymers are used in the paraffin-containing fluid.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the polymer is used as being part of a liquid composition, comprising
(A) 1 to 50 wt. % of the polymers, dissolved in
(B) 99 to 50 wt. % of an aromatic solvent,
each relative to the total weight of (A) and (B).