Abstract: A polymer blend comprising:(A) an acrylic resin;(B) a block copolymer consisting essentially of a polymer block of a polymerized aromatic vinyl compound and/or a polymer block of a polymerized methacrylate monoester and a polyolefin polymer block; and(C) a polymer miscible with the acrylic resin (A) and immiscible with the block copolymer (B),wherein the absolute value (.vertline..eta..sub.AC -.eta..sub.B .vertline.) of the difference between the refractive index (.eta..sub.AC) of the blend of the acrylic resin (A) and the polymer (C) and the refractive index (.eta..sub.B) of the block copolymer (B) is 0.01 or less. This polymer block has excellent transparency, softness and other properties.

Abstract: Polymer blends comprising a copolymer (A) which comprises 50 to 98% by weight of units from methyl methacrylate, 2 to 50% by weight of units from an acrylate and/or methacrylate having a halogen-substituted aromatic ring, and 0 to 25% by weight of units from other copolymerizable .alpha.,.beta.-substituted monomer, and an aromatic polycarbonate (B).

Abstract: Provided are polyvinyl ester macromonomers (A) having excellent polymerizability and highly controlled composition, structure and distribution of polymerization degree.Also provided are polyvinyl alcohol macromonomers (B) obtained by solvolysis of the above polyvinyl ester macromonomers (A) and having excellent polymerizability and highly controlled composition, structure and distribution of polymerization degree.Further provided are polymers (C) obtained by polymerization of the above polyvinyl ester macromonomers (A) and containing units from polyvinyl ester macromonomers having highly controlled composition, structure and distribution of polymerization degree. These polymers (C) are useful as compatibility improving agents, surface improving agents and like agents.