1) Butene 2) Butylene 3) Polybutylene 1) Polybutylene 
Polybutene and polyisobutylene are liquid oligomers widely used as plasticizers for high-molecular weight polymers, such as polyethylene. They are not to be confused with the high molecular weight polymer polybutene-1. ==Properties== The liquid is clear and colourless, and is sold in many different grades. The grades are determined mainly by molec...