Producing blocks of block copolymer in a separator downstream of a reactor

A method for making block copolymers, comprising:

• polymerizing a feedstock comprising a monomer and a comonomer in the presence of a catalyst in a reactor at a temperature and pressure sufficient to produce a first effluent comprising a first polyolefin block, an unreacted monomer, and an unreacted comonomer;
• removing the first effluent from the reactor;
• blending the first effluent with a coordinative chain transfer polymerization agent to produce a mixture;
• introducing the mixture comprising the first effluent and the coordinative chain transfer polymerization agent to a first separator;
• operating the first separator at a pressure that is about 1 psig to about 5 psig less than the pressure of the reactor or at a temperature that is about 5° C. to about 80° C. more than the temperature of the reactor to remove volatile monomer, comonomer and solvent from the separator;
• polymerizing the mixture comprising the first effluent and the coordinative chain transfer polymerization agent in the first separator to cause the unreacted monomer and the unreacted comonomer to polymerize onto one end of the first polyolefin block as a second polyolefin block, thereby forming a block copolymer, wherein the first polyolefin block has a first comonomer content and the second polyolefin block has a second comonomer content that is different than the first comonomer content;
• removing the second effluent from the first separator;
• blending the second effluent with a second coordinative chain transfer polymerization agent to produce a second mixture;
• introducing the second mixture comprising the second effluent and the second coordinative chain transfer polymerization agent to a second separator;
• operating the second separator at a pressure that is about 1 psig to about 5 psig less than the pressure of the reactor or at a temperature that is about 5° C. to about 80° C. more than the temperature of the reactor to remove volatile monomer, comonomer and solvent from the second separator;
• and
• polymerizing the second mixture in the second separator to cause the unreacted monomer and the unreacted comonomer to polymerize onto one end of the second polyolefin block as a third polyolefin block of the block copolymer, wherein the third polyolefin block has a third comonomer content that is different than the second comonomer content.