Abstract: A polyol composition, a composition for polyurethane preparation comprising the polyol composition, and a battery module according to the present invention comprise a compound represented by chemical formula 1 (see the description of the invention). In addition, the polyol composition according to the present invention comprises a first unit derived from at least one type of 1,4:3,6-dianhydrohexitol and a second unit derived from an alkylene oxide, and has a degree of unsaturation of 0.02 meq/g or less according to the following measurement method (see the description of the invention).

Abstract: The present invention relates to a method and apparatus for growing sapphire single crystals, and more particularly to a method and apparatus for growing sapphire single crystals in which a high quality, long single crystal can be obtained within a short period of time upon the use of a long rectangular crucible and a long seed crystal extending in a c-axial direction. Use of the method and apparatus for growing sapphire single crystals according to the present invention can uniformly maintain the horizontal temperature at the inside of the crucible despite the use of a rectangular crucible, thereby obtaining a high-quality single crystal as well decreasing the possibility of a failure in the growth of the single crystal.

Abstract: A double metal cyanide catalyst of the present invention having a controlled reactivity for preparing a polyol, which contains an ether ligand having a molecular weight of less than 200 and a glycol ligand having a molecular weight of less than 200 can be used in the preparation of a polyol having a unsaturation degree suitable for direct use for producing a polyurethane having suitable properties.

Abstract: The present invention relates to a method and apparatus for growing sapphire single crystals, and more particularly to a method and apparatus for growing sapphire single crystals in which a high quality, long single crystal can be obtained within a short period of time upon the use of a long rectangular crucible and a long seed crystal extending in a c-axial direction. Use of the method and apparatus for growing sapphire single crystals according to the present invention can uniformly maintain the horizontal temperature at the inside of the crucible despite the use of a rectangular crucible, thereby obtaining a high-quality single crystal as well decreasing the possibility of a failure in the growth of the single crystal.

Abstract: A double metal cyanide catalyst of the present invention having a controlled reactivity for preparing a polyol, which contains an ether ligand having a molecular weight of less than 200 and a glycol ligand having a molecular weight of less than 200 can be used in the preparation of a polyol having a unsaturation degree suitable for direct use for producing a polyurethane having suitable properties.