Block copolymers and process for their preparation

A process for producing a block copolymer having formula A-B (I) or A-B-A (II), wherein A is a crystallizable isotactic polypropylene block segment (Block A segment) having a degree of polymerization ranging from 5 to 200,000 and a molecular weight distribution Mw/Mn<2.5, and B is an amorphous olefinic elastomeric block segment (Block B segment), which comprises the cross-coupling of carbanions using a coupling agent, wherein a first carbanion is obtained by a reaction between a terminal unsaturated bond of an isotactic polypropylene and an organic metal compound, and a second carbanion is obtained by living anion polymerization of an olefinic unsaturated monomer, using an initiator, or by polymerizing an olefinic unsaturated monomer by a sequential living anion polymerization using a carbanion obtained by a reaction between a terminal unsaturated bond of an isotactic polypropylene and an organic metal compound as the initiation point of the polymerization.

A process comprising forming an article comprising a block copolymer having formula A-B (I) or A-B-A (II), wherein A is a crystallizable isotactic polypropylene block segment (Block A segment) having a degree of polymerization ranging from 5 to 200,000 and a molecular weight distribution Mw/Mn<2.5, and B is an amorphous olefinic elastomeric block segment (Block B segment) having a molecular weight ranging from 100 to 500,000 g/mol, and a molecular weight distribution (Mw/Mn)≦2.0.

A process comprising preparing a polymer composition comprising a block copolymer having formula A-B (I) or A-B-A (II), wherein A is a crystallizable isotactic polypropylene block segment (Block A segment) having a degree of polymerization ranging from 5 to 200,000 and a molecular weight distribution Mw/Mn<2.5, and B is an amorphous olefinic elastomeric block segment (Block B segment) having a molecular weight ranging from 100 to 500,000 g/mol, and a molecular weight distribution (Mw/Mn)≦2.0.

A molded article comprising a block copolymer having formula A-B (I) or A-B-A (II), wherein A is a crystallizable isotactic polypropylene block segment (Block A segment) having a degree of polymerization ranging from 5 to 200,000 and a molecular weight distribution Mw/Mn<2.5, and B is an amorphous olefinic elastomeric block segment (Block B segment) having a molecular weight ranging from 100 to 500,000 g/mol, and a molecular weight distribution (Mw/Mn)≦2.0.

Films, fibers, sheets or foamed articles comprising a block copolymer having formula A-B (I) or A-B-A (II), wherein A is a crystallizable isotactic polypropylene block segment (Block A segment) having a degree of polymerization ranging from 5 to 200,000 and a molecular weight distribution Mw/Mn<2.5, and B is an amorphous olefinic elastomeric block segment (Block B segment) having a molecular weight ranging from 100 to 500,000 g/mol, and a molecular weight distribution (Mw/Mn)≦2.0.