Patent ID: 11965086
Assignee: LCY CHEMICAL CORP.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 13:
14. A method for manufacturing styrene-isoprene-styrene triblock copolymer, the styrene-isoprene-styrene triblock copolymer comprising a first polystyrene block, a polyisoprene block and a second polystyrene block, the method comprising the following steps:
performing a first polymerization reaction by adding styrene and initiator to form the first polystyrene block;
performing a second polymerization reaction by adding isoprene to form the polyisoprene block at a terminal of the first polystyrene block; and
performing a third polymerization reaction by adding styrene to form the second polystyrene block at an end of the polyisoprene block,
wherein a total amount of the styrene added is 35-50 parts by weight, a total amount of the isoprene added is 65-50 parts by weight,
wherein a weight average molecular weight (Mw) of the styrene-isoprene-styrene triblock copolymer is 50,000-75,000, and
wherein the styrene-isoprene-styrene triblock copolymer comprises 8-20 mol % of branched vinyl groups, wherein a melt flow index (MFI)(190° C./2.16 kg) of the composition is above 35 (g/10 min), a styrene isoprene diblock copolymer in the composition is less than 1 wt % and a toluene solution viscosity (TSV) (25%) of the composition is less than 100 cps.