abstract |
OLEFIN COPOLYMERS CONSISTING OF RESIDUES OF AT LEAST THREE DIFFERENT ALPHA-OLEFINS CONTAINING FROM 3 TO 25 CARBON ATOMS HAVE UTILITY AS VISCOSITY INDEX IMPROVERS. THE COPOLYMERS HAVE A MOLECULAR WEIGHT BETWEEN ABOUT 50,000 AND ABOUT 3,000,000 AND AN X-RAY CRYSTALLINITY BETWEEN ABOUT 10 AND ABOUT 50%. |