Copolymer, production process thereof, lubricating oil...

Details Copolymer, production process thereof, lubricating oil... Copolymer, production process thereof, lubricating oil...

2011-03-29

2011-03-29

Choi, Ling-Siu (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S160000, C526S124300, C526S348000, C526S348200, C526S348300, C526S348600

Reexamination Certificate

active

07915358

ABSTRACT:
Copolymers when used as lubricating oil viscosity modifiers enable lubricating oils to show excellent low-temperature properties. Processes for producing the copolymers are disclosed. Lubricating oil viscosity modifiers and lubricating oil compositions contain the copolymers.A copolymer includes structural units derived from ethylene and structural units derived from a C3-20 α-olefin and satisfies the following requirements (1) to (8): (1) the melting point (Tm) according to DSC is in the range of 0 to 60° C.; (2) the melting point (Tm) and the density D (g/cm3) satisfy the equation: Tm≧1073×D−893; (3) Mw/Mn according to GPC is from 1.6 to 5.0; (4) the half-value width (ΔThalf) of a melting peak measured by DSC is not more than 90° C.; (5) the half-value width (ΔThalf) and the melting point (Tm) satisfy the equation: ΔThalf≦−0.71×Tm+101.4; (6) the heat of fusion (ΔH) as measured by DSC is not more than 60 J/g; (7) the crystallization temperature (Tc) measured by DSC is not more than 70° C.; (8) the heat of fusion (ΔH), the crystallization temperature (Tc), each measured by DSC and the crystallization temperature measured by a CRYSTAF method (Tcrystaf) satisfy the equation: Tc−Tcrystaf≧0.028×ΔH+25.3.

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