Complex of methacrylate copolymer and alkylbenzene in lubrication oil - as viscosity index improver, dispersant and antioxidant

摘要

A complex (I) contains (1) a polymethacrylate of mol. wt. 5 x 104-106, and (2) a liquid alkylbenzene of mol. wt. 100-5000. The ratio by wt. of (1):(2) is 1:1-2:3 2:1. The polymethacrylate is obtd. by copolymerising (a) 1-10 wt.% of RR'N-A-O-CO-C(CH3)=CH2, where R and R1 are 1-2C alkyl and A is 1-5C alkanediyl, (b) 15-30% of R2OOC-C(CH3)=CH2, where R2 is 1-6C alkyl, (c) 40-60% of R3OOC-C(CH3)=CH2, where R3 is 10-14C alkyl, and (d) 15-30% of R4OOC-C(CH3)=CH2, where R4 is 16-20C alkyl, in the presence of the alkylbenzene. (I) is (VI) improver for lubricating oils, esp. automatic transmission fluids and crankcase oils. (I) combines good (VI) improving properties with dispersant and antioxidant properties.