Phillips Petroleum Company

Mark D Hanes

William H Beever

David L Hartsock

Lee A Carvell

A process for reducing the haze of extrusions of clear polymeric blends containing styrene-butadiene copolymer and a polymer immiscible therewith. An assembly of extrusion layers in which a layer of clear polymeric blends containing styrene/butadiene copolymer and a polymer immiscible therewith is overlayered with layers of clear material that provides a smooth extruded surface.

Process for minimizing haze of extruded clear blends containing styrene/butadiene polymer and product thereof

Optical clarity is improved in blends of two transparent immiscible polymers by addition of a third polymer which is selectively miscible with one of the two original immiscible polymers. The ratio of amounts of the third polymer and the one original polymer with which it is miscible is adjusted to achieve a resultant refractive index close to the refractive index of the other of the two original immiscible polymers. Alternatively, if particular amounts of the third polymer and the original polymer with which it is miscible are desired, then the other of the two immiscible polymers is chosen to be one having a refractive index close to the resultant refractive index of the two miscible polymers. One particular blend system in which optical clarity is improved by use of the methods of this invention is a blend comprising: (a) a resinous monovinyl aromatic-conjugated diene copolymer; (b) a styrene-maleic anhydride copolymer; and (c) poly(alpha-methylstyrene).

Polymer blend clarity

A polymer blend composition comprising (A) a monovinylarene/conjugated diene block copolymer, and (B) a styrenic polymer of styrene/methyl methacrylate is provided. A process for preparing the composition and articles prepared from the composition are also provided.

Blends of a styrenic polymer and monovinylaren/conjugated diene block

A composition comprising (A) a monovinylarene/conjugated diene block copolymer, (B) an amorphous poly(ethylene terephthalate), and (C) a crystalline poly(ethylene terephthalate). A process for preparing the composition and articles manufactured from the composition are also provided.

Blends of poly (ethylene terephthalate) and monovinylarene/conjugated

A composition comprising a poly(ethylene terephthalate), a monovinylarene/conjugated diene block copolymer, and an organic peroxide is provided. A process for preparing the composition and articles prepared from the composition are also provided

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Bartlesville, OK, United States of America

Mark D Hanes