# US 4,391,720 A · Bis(hydroxylkyl)disiloxanes and lubricant compositions thereof

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- Number: US 4,391,720 A
- Document ID: US4391720A
- Status: Granted
- Kind: A
- Application number: 06/408,502
- Filed: 1982-08-16
- Granted: 1983-07-05
- Earliest claimed: 1981-02-05
- Assignees: RCA Corporation
- Inventors: Chih C. Wang; Ronald F. Bates
- Web page: https://patentgrep.com/patent/US4391720A

## CPC

- C07F 7/14: Preparation thereof from {optionally substituted} halogenated silanes and hydrocarbons {hydrosilylation reactions}
- C10M 105/76: containing silicon
- C10M 107/50: containing silicon
- C10M 111/04: at least one of them being a macromolecular organic compound
- C10M 139/04: having a silicon-to-carbon bond, e.g. silanes
- C10M 169/04: Mixtures of base-materials and additives
- G11B 3/682: {comprising protective coatings, e.g. anti static, anti-friction}
- C10M 2227/025: used as base material
- C10M 2227/04: having a silicon-to-carbon bond, e.g. organo-silanes
- C10M 2227/045: used as base material
- C10M 2229/025: used as base material
- C10M 2229/0405: used as base material
- C10M 2229/041: containing aliphatic substituents
- C10M 2229/0415: used as base material
- C10M 2229/0425: used as base material
- C10M 2229/0435: used as base material
- C10M 2229/0445: used as base material
- C10M 2229/0455: used as base material
- C10M 2229/0465: used as base material
- C10M 2229/0475: used as base material
- C10M 2229/0485: used as base material
- C10M 2229/0505: used as base material
- C10M 2229/0515: used as base material
- C10M 2229/0525: used as base material
- C10M 2229/0535: used as base material
- C10M 2229/0545: used as base material
- C10N 2020/01: {Physico-chemical properties}
- C10N 2040/00: Specified use or application for which the lubricating composition is intended
- C10N 2040/30: Refrigerators lubricants {or compressors lubricants}
- C10N 2040/32: Wires, ropes or cables lubricants
- C10N 2040/34: Lubricating-sealants
- C10N 2040/36: Release agents {or mold release agents}
- C10N 2040/38: {Conveyors or chain belts}
- C10N 2040/40: {Generators or electric motors in oil or gas winning field}
- C10N 2040/42: {Flashing oils or marking oils}
- C10N 2040/44: {Super vacuum or supercritical use}
- C10N 2040/50: {Medical uses}
- C10N 2050/04: Aerosols
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- 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)
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

Bis(hydroxyalkyl)disiloxane lubricants of the formula ##STR1## wherein R.sub.1 and R.sub.3 are methyl or ethyl and R.sub.2 and R.sub.4 are linear alkyl groups of up to 20 carbon atoms. These compounds are useful as additives to methyl alkyl siloxane lubricants for conductive high density information discs. Discs lubricated with the lubricant mixture exhibit improved stability to environments of high temperature and high relative humidity.

## Claims

### Claim 1

A composition comprising a solution of a methyl alkyl siloxane lubricant of the formula ##STR8## wherein R.sub.5 and R.sub.6 are alkyl groups of 4 to 20 carbon atoms, x is an integer of 2-4, y is an integer of 0-2 and wherein the sum of x and y is 4 or less, containing from about 5 percent to about 70 percent by weight of the lubricant of a compound of the formula ##STR9## wherein R.sub.1 and R.sub.3 are methyl or ethyl and R.sub.2 and R.sub.4 are linear alkyl groups of up to 20 carbon atoms.

### Claim 2 (depends on 1)

A composition according to claim 1 wherein the lubricant contains from about 10 percent to about 20 percent by weight of the bis(hydroxyalkyl)disiloxane of claim 1.

### Claim 3 (depends on 1)

A composition according to claim 1 wherein R.sub.1 and R.sub.3 are methyl.

### Claim 4 (depends on 1)

A composition according to claim 1 wherein R.sub.2 and R.sub.4 are C.sub.8 -C.sub.12.

### Claim 5 (depends on 1)

A composition according to claim 1 wherein R.sub.1 and R.sub.3 are methyl and R.sub.2 and R.sub.4 are C.sub.10 H.sub.21.

### Claim 6 (depends on 2)

A composition according to claim 2 wherein R.sub.1 and R.sub.3 are methyl and R.sub.2 and R.sub.4 are C.sub.10 H.sub.21.