Concentrates containing specific functionalized diblock copolymers serve as effective additives for improving the cold flow behavior of fuels and oils, the copolymers being derived from a terminally-unsaturated intermediate polymer obtained via a metallocene process involving hydrogen.

The present invention relates to a method for preparing a polyolefin-polystyrene-based multiblock copolymer having a uniform structure and showing excellent physical properties through continuous type coordination polymerization and batch type anionic polymerization.

The present invention relates to a method for preparing a polyolefin-polystyrene-based multiblock copolymer having a uniform structure and showing excellent physical properties through continuous type coordination polymerization and batch type anionic polymerization.

Triblock polymers of formula A-B-C, in which the symbol A represents a polystyrene block, and the symbol B represents a statistical copolymer block with a glass transition temperature of less than-10 C., are provided. The statistical copolymer comprises units of a 1,3-diene and more than 50 mol % of ethylene units. The symbol C represents a polyethylene block with a melting temperature of greater than 90 C. The triblock polymers exhibit good elastic recovery.

Triblock polymers of formula A-B-C, in which the symbol A represents a polystyrene block, and the symbol B represents a statistical copolymer block with a glass transition temperature of less than-10 C., are provided. The statistical copolymer comprises units of a 1,3-diene and more than 50 mol % of ethylene units. The symbol C represents a polyethylene block with a melting temperature of greater than 90 C. The triblock polymers exhibit good elastic recovery.