Citric acid ethyl ester is used as a plasticizer for polyvinylchloride and similar plastics.
Dibutyl sebacate is a dibutyl ester of sebacic acid. Its main use is as a plasticizer in production of plastics such as cellulose acetate butyrate, cellulose acetate propionate, ethyl cellulose, polyvinyl butyral, polyvinyl chloride, polystyrene, and many synthetic rubbers and other plastics.
Polybutene and polyisobutylene are liquid oligomers widely used as plasticizers for high-molecular weight polymers, such as polyethylene.
n-Butyl benzyl phthalate is an ester of phthalic acid, benzyl alcohol and n-butanol. It is mostly used as a plasticizer for PVC.