Polyether ester composition, polyurethane resin composition, and optical material using the same
AssigneeDIC Corporation
InventorsTomoyuki Imada, Kouji Shiraishi
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Abstract
A polyurethane resin composition for optical applications can contain, as essential components, a polyisocyanate and a polyester-ether polyol obtained by polycondensation of a glycol component containing an alkylene oxide adduct of a bisphenol and an aromatic carboxylic acid component and particularly preferably having a glass transition temperature of 50° C. or lower. An optical material using the composition is also provided for.
Claims14
A polyurethane resin composition obtained by allowing a polyisocyanate to react with a polyester-ether polyol obtained by polycondensation of a glycol component containing an alkylene oxide adduct of a bisphenol and an aromatic carboxylic acid component, wherein the polyester-ether polyol has a refractive index of 1.55 to 1.65 at 25° C. and a glass transition temperature of 50° C. or lower as measured by differential scanning calorimetry (DSC), and wherein the polyurethane resin composition provides, upon curing, a product having a refractive index of 1.55 or more at 25° C.
An optical material comprising a polyurethane resin composition obtained by allowing a polyisocyanate to react with a polyester-ether polyol obtained by polycondensation of a glycol component containing an alkylene oxide adduct of a bisphenol and an aromatic carboxylic acid component, wherein the polyester-ether polyol has a refractive index of 1.55 to 1.65 at 25° C. and a glass transition temperature of 50° C. or lower as measured by differential scanning calorimetry (DSC).
A polyurethane resin composition obtained by allowing a polyisocyanate to react with a polyester-ether polyol polycondensation of a glycol component containing an alkylene oxide adduct of a bisphenol and an aromatic carboxylic acid component, wherein the polyester-ether polyol has a refractive index of 1.55 to 1.65 at 25° C. and a glass transition temperature of 50° C. or lower as measured by differential scanning calorimetry (DSC), and wherein the ratio of hydroxyl equivalents of the polyester-ether polyol to isocyanate equivalents of the polyisocyanate is in the range of 0.90:1 to 1.10:1.
Dependencies are inferred from the claim text.