Used as an intermediate of sodium succinate dioctanoate (rapid osmotic agent T). The product can also be used as plasticizer, but can be copolymerized with vinyl chloride, vinyl acetate, styrene and acrylic ester, the copolymer has excellent impact resistance, cracking resistance, electrical and optical properties, can be used as film, paint, adhesive, rubber, pigment fixative, oil additives, paper treatment agent, etc. Vinyl acetate copolymer is used as elastic rubber material and can be used as coating. The film made of vinyl chloride copolymer has good softener at low temperature.