# US 4,396,518 A · Demulsifier composition for automatic transmission fluids

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- Number: US 4,396,518 A
- Document ID: US4396518A
- Status: Granted
- Kind: A
- Application number: 06/314,744
- Filed: 1981-10-26
- Granted: 1983-08-02
- Earliest claimed: 1981-10-26
- Assignees: Exxon Research & Engineering Co.
- Inventors: Jack Ryer; Harold E. Deen
- Web page: https://patentgrep.com/patent/US4396518A

## CPC

- C10M 145/18: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M 145/20: Condensation polymers of aldehydes or ketones
- C10M 145/34: of two or more specified different types
- C10M 145/36: etherified
- C10M 145/38: esterified
- C10M 2209/10: Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M 2209/101: Condensation polymers of aldehydes or ketones and phenols, e.g. Also polyoxyalkylene ether derivatives thereof
- C10M 2209/104: of alkylene oxides containing two carbon atoms only
- C10M 2209/105: of alkylene oxides containing three carbon atoms only
- C10M 2209/107: of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
- C10M 2209/108: etherified
- C10M 2209/109: esterified
- C10M 2209/11: Complex polyesters
- C10M 2209/111: having dicarboxylic acid centres
- C10M 2209/112: having dihydric acid centres
- C10N 2040/08: Hydraulic fluids, e.g. brake-fluids
- 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)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

There is disclosed an automatic transmission fluid containing an improved demulsifier additive being a combination of an acylated alkoxylated isopentylphenolic resin and a propoxylated-ethoxylated amylphenolic resin, the additive being effective at concentrations of 30 to 50 ppm.

## Claims

### Claim 1

An automatic transmission fluid comprising a formulated automatic transmission fluid containing a demulsifier additive, said additive providing effective demulsification at concentrations of 30 to 50 parts per million, the demulsifier consisting essentially of two components:
(a) 50 to 75 weight percent of a solution in aromatic hydrocarbon solvent of an oil soluble isopentylphenol-formaldehyde resin having a degree of polymerization of 5-10, the resin being alkoxylated with 1 to 5 moles of ethylene oxide or propylene oxide and acylated by reaction with acetic acid or propionic acid, the solution having a concentration of 35 to 50 weight percent of said resin; and
(b) 50 to 25 weight percent of a 40 to 50 weight percent solution in aromatic hydrocarbon solvent of an oil soluble amylphenolformaldehyde resin having a degree of polymerization of 5-10 which has been alkoxylated with a propylene oxide-ethylene oxide mixture, the mixture containing 60-70 weight percent of propylene oxide, the weight ratio of resin to said mixture being 1 to 2.5.

### Claim 2 (depends on 1)

The composition of claim 1 where the two component additive consists of 75 weight percent of said (a) component and 25 weight percent of said (b) component.

### Claim 3 (depends on 2)

The composition of claim 2 where the aromatic solvent for said (a) component and (b) component is toluene or xylene.

### Claim 4 (depends on 3)

The composition of claim 3 where the concentration of said (a) component in said solvent is about 39 weight percent and the concentration in said solvent of said (b) component is about 45 weight percent.