Solvent dewaxing waxy bright stock using a combination polydialkyl fumarate-vinyl acetate copolymer and polyalkyl (meth-) acrylate polymer dewaxing aid
US4460453A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1982 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Sep 29, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G73/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
It has been discovered that (a) poly di alkyl fumarate/vinyl acetate copolymers in combination with (B) poly alkyl (meth-) acrylate polymers are effective dewaxing aids for the solvent dewaxing of bright stocks. The poly di alkyl fumarate/vinyl acetate copolymer component of the combination dewaxing aid used in the process of the present invention has a number average molecular weight of about 1000 to 100,000 and possesses alkyl side chain moieties of from C.sub.16 -C.sub.24.sup.+ in length (excluding branching) with a pendent side chain length of predominantly (>50%) C.sub.20. The polyalkyl (meth-) acrylate is the polymeric ester of aliphatic alcohols having groups 10 to 20 carbons in length, excluding branching (pendent side chain length predominantly (>50%) C.sub.14 and lower) and acrylic or (meth-) acrylic acid (preferably methacrylic acid) and possesses a number average molecular weight of at least 5,000. The solvent dewaxing processes benefitted by the use of the present combination are those using standard normally liquid solvents such as C.sub.3 -C.sub.6 ketones, aromatic hydrocarbons, halogenated hydrocarbons and mixtures thereof. The waxy hydrocarbon oil dewaxed is a brig…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.