Process for the preparation of polyester polyols, based on...

Details Process for the preparation of polyester polyols, based on... Process for the preparation of polyester polyols, based on...

C - Chemistry, Metallurgy

08

G

400/102, 403/14,

C08G 18/42 (2006.01) C08G 63/16 (2006.01)

Patent

CA 1274041

PROCESS FOR THE PREPARATION OF POLYESTER POLYOLS 9 BASED ON 2-METHYL-1,4-BUTANEDIOL, WHICH ARE LIQUID AT ROOM TEMPERATURE, AND THEIR USE FOR THE PREPARATION OF PLASTIC MATERIALS Abstract of Disclosure This invention relates to polyester polyols which are liquid at 25°C and contain units having the structure -OCH2- CH(CH3)-CH2CH20- which are bound together and have an average functionality of from about 2 to 3, a hydroxyl number of from about 25 to 300, an acid number of less than about 2, and a viscosity of from about 200 to 105 mPas at 25°C. The polyols are prepared through polycondensation in the molten state, in the presence of or absence of esterification catalysts, of an aliphatic di- and/or polycarboxylic acid and/or di- and/or polycarboxylic acid anhydride and 2-methyl-1,4-butanediol or mixtures comprised of 2 methyl-1,4-butanediol and at least one linear or branched, alipahtic di- through tetravalent alcohol, which optionally contains ether bridges and has a 2-methyl-1,4- butanediol content of at least 20 weight percent based on the weight of the alcohol mixture. The polyester polyols are suited for the preparation of noncellular or cellular polyurethane plastics or poly- urethane-polyurea plastics and preferably polyurethane elasto- mers, using the polyisocyanate addition polymerization process.

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