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:
May. 18, 2010
Filed:
Jul. 14, 2005
Yoshihiro Morishita, Tsukuba, JP;
Noboru Higashida, Kashima-gun, JP;
Hidetaka Oonuma, Kashima-gun, JP;
Kenichi Hamada, Tsukuba, JP;
Kazushige Ishiura, Chuo-ku, JP;
Yoshihiro Morishita, Tsukuba, JP;
Noboru Higashida, Kashima-gun, JP;
Hidetaka Oonuma, Kashima-gun, JP;
Kenichi Hamada, Tsukuba, JP;
Kazushige Ishiura, Chuo-ku, JP;
Kuraray Co., Ltd., Kurashiki-shi, JP;
Abstract
A lubricating oil additive containing at least one acrylic block copolymer having a weight-average molecular weight of 10,000 to 1,000,000 and a molecular weight distribution [ratio of weight-average molecular weight (Mw) to number-average molecular weight (Mn), i.e., Mw/Mn ratio] of 1.5 or below; and lubricating oil compositions containing the additive. The lubricating oil additive exhibits a thickening effect higher than those of conventional acrylic lubricating oil additives and can improve the viscosity index of lubricating oil even when added in a small amount. Further, the additive can also improve the low-temperature characteristics, flow characteristics, and shear stability. The lubricating oil compositions enable energy saving and can lengthen the lifetime of lubricating oil and reduce the load on the global environment.