Patent ID: 9644064
Date: 2017-05-09
CPC Classifications: C08F,C08L

Claim:
1. A method of producing an olefin block copolymer, comprising: subjecting ethylene or propylene and an α-olefin to copolymerization at a temperature of 70 to 150° C. in the presence of a catalyst composition comprising a metallocene catalyst having a Group IV transition metal and a Lewis base functional group, and a cocatalyst having a Lewis acid element and an organic functional group, wherein the metallocene catalyst comprises a metallocene compound of Chemical Formula 1: in Chemical Formula 1, R1 to R17 are the same with or different from each other, and are independently hydrogen, a halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C6-C20 aryl group, a C7-C20 alkylaryl group, or a C7-C20 arylalkyl group, respectively, L is a straight or branched chain C1-C10 alkylene group, D is —O—, —S— or —N(R)—, wherein R is hydrogen, a halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, or a C6-C20 aryl group, A is hydrogen, a halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C6-C20 aryl group, a C7-C20 alkylaryl group, a C7-C20 arylalkyl group, a C2-C20 alkoxy alkyl group, a C2-C20 heterocyclic alkyl group, or a C5-C20 heteroaryl group, and when the D is —N(R)—, R can be linked with A to form a heterocycle comprising nitrogen, for example, a five to eight membered heterocycle such as piperidinyl or pyrrolidinyl moiety, M is a Group IV transition metal, X1 and X2 are the same with or different from each other, and are independently a halogen, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C6-C20 aryl group, a nitro group, an amido group, a C1-C20 alkylsilyl group, a C1-C20 alkoxy group, or a C0-C20 sulfonate group, respectively; wherein at the copolymerization temperature, there occur alternatively between the metallocene catalyst and the cocatalyst a first state in which the Lewis base functional group and the Lewis acid element form an acid-base bond and a second state in which the metallocene catalyst and the cocatalyst has no interaction therebetween; wherein the Group IV transition metal of the metallocene catalyst and the organic functional group of the cocatalyst do interaction with each other in the first state; wherein the olefin block copolymer comprises a plurality of blocks or segments, each comprising an ethylene or propylene repeating unit and an α-olefin repeating unit at different mole fractions, and the olefin block copolymer comprises polymer chains comprising 20 to 100 short-chain branches (SCBs) per 1,000 carbon atoms; and wherein a point where a first derivative of the number Y of the SCBs per 1,000 carbon atoms of each polymer chain with respect to the molecular weight X of the polymer chain is 0 exists between the minimum values of the molecular weight X and the maximum peak molecular weight Mp of the block copolymer.