Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2006-04-04
2006-04-04
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S242000, C525S244000, C525S314000, C525S315000, C525S323000, C526S348000, C508S591000
Reexamination Certificate
active
07022766
ABSTRACT:
The present invention provides an olefin block copolymer for a viscosity index improver capable of preparing a lubricating oil composition having excellent low temperature properties and excellent balance between viscosity and shear stability, a viscosity index improver and a lubricating oil composition comprising the viscosity index improver.The olefin block copolymer has a Mw/Mn of not more than 1.5, and comprises:(i) a polymer block comprising ethylene and an α-olefin of 3 to 20 carbon atoms, having a molar ratio (ethylene/α-olefin) of ethylene units to α-olefin units of from 20/80 to 65/35, a Mw of 50,000 to 2,000,000, and having a slope of an intramolecular composition distribution of absolute value of 0.1 to 0, and(ii) a polymer block comprising ethylene and an α-olefin of 3 to 20 carbon atoms, having a molar ratio (ethylene/α-olefin) of ethylene units to α-olefin units of from 70/30 to 85/15, a Mw of 10,000 to 400,000, and having a slope of an intramolecular composition distribution of absolute value of 0.1 to 0.
REFERENCES:
patent: 3697429 (1972-10-01), Engel et al.
patent: 4621114 (1986-11-01), Watanabe
patent: 4804794 (1989-02-01), Ver Strate et al.
patent: 4959436 (1990-09-01), Cozewith et al.
patent: 5115030 (1992-05-01), Tanaka et al.
patent: 5208265 (1993-05-01), de Grave et al.
patent: 0 129 414 (1984-12-01), None
patent: 0 299 608 (1989-01-01), None
patent: 1 197 500 (2002-04-01), None
patent: 6-96624 (1994-11-01), None
patent: 2002-507225 (2002-03-01), None
patent: WO 95/27745 (1995-10-01), None
patent: WO 98/02471 (1998-01-01), None
patent: WO 98/58978 (1998-12-01), None
Fujita Terunori
Ikenaga Shigenobu
Kaneshige Ryousuke
Kojoh Shin-ichi
Matsugi Tomoaki
Asinovsky Olga
Birch & Stewart Kolasch & Birch, LLP
Mitsui Chemicals Inc.
Seidleck James J.
LandOfFree
Olefin block copolymer, viscosity index improver for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Olefin block copolymer, viscosity index improver for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Olefin block copolymer, viscosity index improver for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3576161