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:
Jul. 12, 1988
Filed:
Nov. 07, 1986
Jacques Jarrin, Boulogne, FR;
Magali Robine, Rueil Malmaison, FR;
Guy Parc, Rueil Malmaison, FR;
Francois Dawans, Bougival, FR;
Institut Francais du Petrol, Rueil-Malmaison, FR;
Abstract
Compositions of copolymers are disclosed containing 10 to 35% by weight of units derived from at least one vinylaromatic monomer, 5 to 15% by weight of units derived from at least one linear or branched alkyl methacrylate with 1 to 4 carbon atoms, 20 to 50% by weight of units derived from at least one linear alkyl methacrylate with 8 to 14 carbon atoms and 15 to 50% by weight of units derived from at least one linear alkyl methacrylate with 16 to 22 carbon atoms. The copolymer compositions have a weight average molecular weight of 100,000 to 400,000 and a polydispersity index in general of less than 5. They are prepared by any free-radical copolymerization method using for example azo or peroxide initiators. These compositions have the advantage of providing a better compromise between the characteristics required of a viscosity additive for lubricating oils.