The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 1983
Filed:
Sep. 29, 1982
Cedric L Briens, Richmond, CA;
Bruce M Sankey, Sarnia, CA;
Exxon Research and Engineering Co., Florham Park, NJ (US);
Abstract
This invention relates to processes for solvent dewaxing waxy hydrocarbon oil distillates employing a dewaxing aid which dewaxing aid is a mixture of (a) poly(meth-)acrylate polymers and (b) polydialkylfumarate/vinyl acetate copolymers. The dewaxing aid mixture is selected from the group of mixtures consisting of a mixture of (a) poly(meth-)acrylate polymer which is an ester of a C.sub.10 to C.sub.22 aliphatic alcohol with acrylic or methacrylic acid and has a number average molecular weight greater than about 5,000 and (b) polydialkylfumarate/vinyl acetate copolymer wherein the pendent alkyl side chain group contains from 16-30 carbon atoms but is primarily i.e. >50% C.sub.22 (preferably behenyl), and the component (B) has a number average molecular weight of about 1,000 to 100,000, preferably about 5,000 to 50,000. The combination (a) plus (b) may be employed in a weight ratio within the range of from about 100/1 to 1/100, preferably about 8/1 to 1/4, more preferably about 8/1 to 1/1 most preferably about 3/1 a/b, and at an aid dose level ranging from about 0.01 to 1 wt. %, preferably between about 0.02 to 0.2 wt. % active ingredient. The solvent dewaxing of bright stocks can also be benefitted by using as a dewaxing aid a combination consisting of component B recited above and a component A which is a polymethacrylate copolymer having an average pendent carbon side chain length of predominantly i.e. >50% C.sub.16 and higher.