BLOCK COPOLYMERS PREPARED BY CONTROLLED RADICAL POLYMERIZATION AND THEIR USE AS FLOW MODIFIERS

摘要

Provided are block copolymers containing at least two blocks are provided and comprise: (a) a first block containing residues of at least one first ethylenically unsaturated radically polymerizable monomer that is free of hydroxy functionality, e.g., 2-ethylhexyl methacrylate, and, optionally, a minor amount of at least one hydroxy functional ethylenically unsaturated radically polymerizable monomer, e.g., hydroxypropyl methacrylate; and (b) a second block containing residues of at least one second ethylenically unsaturated radically polymerizable monomer that is free of hydroxy functionality, e.g., iso-butyl methacrylate, and, optionally, a minor amount of at least one hydroxy functional ethylenically unsaturated radically polymerizable monomer. The calculated Tg of the second monomer of the block copolymer is at least 20 DEG C greater than the calculated Tg of the first monomer. Also provided are thermosetting coating compositions that contain the block copolymers as flow additives.