Composition comprising an aromatic polycarbonate and a siloxy-oxyalkylene block copolymer
AssigneeGeneral Electric Company
InventorsSteven W. Scott, Howard A. Vaughn, Jr.
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Abstract
A composition comprising (a) an aromatic polycarbonate and (b) a minor amount of a oxyalkylene siloxane block copolymer, and, optionally, an organic phosphite or phosphonite and/or epoxy compound provide lower viscosity in the melt without producing brittle molded parts.
Claims12
A plasticized, stabilized, polycarbonate molding composition having a combination of improved melt viscosity and high impact strength comprising in admixture (a) an aromatic carbonate homopolymer of bisphenol-A and (b) at least about 0.3 parts of a siloxy-oxyalkylene block copolymer wherein each copolymer contains a siloxane polymer and at least one oxyalkylene polymer in combination, the siloxane polymer being composed of at least one trifunctional silicon atom, bonded to three oxygen atoms and a single monovalent hydrocarbon radical, and joined to at least three difunctional silicon atoms through oxysilicon bonds, each of said difunctional silicon atoms having two monovalent hydrocarbon radicals bonded thereto and the oxyalkylene polymer being composed of at least five oxyalkylene groups bonded to each other by oxycarbon bonds and bonded at one end to the siloxane polymer through a carbon-oxy-silicon bond and bonded at the other end to a monoether radical.
Dependencies are inferred from the claim text.