Bayer Corporation

Bayer Polymers LLC

Jack C Chan

Karl W Haider

Uli W Franz

E Haakan Jonsson

Ronald P Taylor

Mark A Peters

Sivaram Krishnan

Robert Allen Pyles

Arthur W Mason

James N Rieck

Charles S Gracik

Steven C Manning

Pia I Santelices

William G Curtis

A hydrophobic polyurethane elastomer is disclosed comprising an isocyanate terminated prepolymer having an isocyanate content ranging from 4 to 12 wt. % NCO comprising the reaction product of: i) an OH terminated homopolymer of butadiene having molecular weight ranging from 1000 to 4000 and an OH functionality of from 1.9 to 2.1; ii) an aliphatic or cycloaliphatic diisocyanate; and a diol chain extender having a molecular weight ranging from 62 to 400.

Hydrophobic light stable polyurethane elastomer with improved mechanical properties

A process for making a photochromic optical lens is disclosed. In a first embodiment of the process a multi-plied laminate, containing a ply of photochromic thermoplastic polyurethane (herein &ldquo;TPU&rdquo;) and a ply containing thermoplastic polycarbonate, is first placed in the cavity of a suitable mold. The ply that contains polycarbonate resin is placed facing the cavity. Thermoplastic polycarbonate resin is then injected into the cavity. In a second embodiment, referred to as an over-mold method, polycarbonate is first injection molded into a molding cavity to form a substrate. Photochromic TPU is, in a subsequent step, injected into the cavity to form a superstrate overlay. In both embodiments, the articles thus molded are suitable for the preparation of optical lenses.

Process for preparing a photochromic lens

A soft, transparent and processable thermoplastic polyurethane resin suitable in optical application is disclosed. The resin is the product of reacting a diisocyanate, a chain extender, and a mixture of polyether polyols. The mixture of polyether polyols comprise (A) a C,polyether polyol and (B) a C,-C,polyether polyol where the weight ratio A/B is in the range of about 85/15 to 15/85.

Soft, transparent and processable thermoplastic polyurethane

A hydrophobic polyurethane elastomer is disclosed comprising an isocyanate terminated prepolymer comprising: i) from 30 to 90 percent by weight of an OH terminated homopolymer of butadiene having molecular weight ranging from 1000 to 4000 and an OH functionality of from 1.9 to 2.1; ii) from 10 to 70 percent by weight of an isocyanate and an asymmetric diol chain extender having a molecular weight ranging from 75 to 200.

Hydrophobic polyurethane elastomer

A process for making a thermoplastic polyurethane material comprising the steps of casting an NCO-terminated prepolymer with 1,4-butanediol to form a casting composition; extruding the casting composition to form at least one strand of a polyurethane elastomer; pelletizing the at least one strand of said polyurethane elastomer to form at least one pellet; and processing the at least one pellet to form a thermoplastic article.

Composition and process for preparation of thermoplastic polyurethanes

A di-hydroxy-functionalized linear non-crosslinked polyolefin is disclosed having no pendant chain-branched groups which is prepared by reacting 1,4-diacetoxy-2-butene with 1,5-cyclooctadiene in the presence of a catalyst comprising a ruthenium metal carbene complex, characterized in that the functionality number of said polyolefin as determined by NMR is 2.0 and the viscosity of said polyolefin ranges from about 800 to 16000 mPa.s @25.degree. C. at a number average molecular weight ranging from 2,600 to 6,500 g/mole. A prepolymer comprising the reaction of a polyisocyanate with the polyolefin is also disclosed.

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Coraopolis, PA, United States of America

Jack C Chan