Central system fluid composition
US4031020A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 29, 1975 |
| Grant date | Jun 21, 1977 |
| Priority date | — |
| Expiry date | May 29, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A central system fluid composition composed of 5-30% by weight of a viscosity index improver, up to 10% by weight of another additive, and the balance being a hydrocarbon-type base oil, which is characterized in that the hydrocarbon-type base oil is composed of 50-100% by weight, based on its total weight, of at least one chief base oil component selected from the group consisting of PA1 A. polybutenes with an average molecular weight of 100 - 500, PA1 B. homo- or copolymers with an average molecular weight of 100 to 500 of at least one .alpha.-olefin containing 2-12 carbons, excepting butenes, and PA1 C. hydrogenation products boiling at 250.degree.-380.degree. C of high aromatic components which are obtained by cracking petroleum oils, And 0-50% by weight, based on its total weight, of a mineral oil; and that the viscosity index improver is composed of at least one component selected from the group consisting of PA1 1. polymethacrylates with an average molecular weight of 50,000-200,000, which are obtained by polymerizing at least one ester of a saturated, monohydric aliphatic alcohol of 1-18 carbons with methacrylic acid, and PA1 2. polymers with an average molecular weight of 1…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.