Polyester polyols based on 2-methyl pentane diol-1,5, 2-ethyl butane diol-1,4, 2-methyl glutaric acid and/or 2-ethyl succinic acid, liquid at room temperature, and the resultant dicarbonic-acid derivatives, process for their preparation and their use in the preparation of synthetics by the polyisocyanate polyaddition process

摘要

The invention describes liquid polyester polyols having an average functionality of from 2 to 3, a hydroxyl number of 25 to 400, an acid number of less than 10 and a viscosity at 25 ° C of 200 to 10⁵m.Pa.s at 25 ° C, the units having at least one of the structures -O-CH₂-CH (CH₃) -CH₂-CH₂-CH₂-O- -O-CH₂-CH (C₂H₅) -CH₂-CH₂-O-, -O-CH (CH₃) -CH₂-CH₂-CO- or -OC-CH (C₂H₅) -CH₂-CO- bonded form.; The polyester polyols can be 2-Ethylbutandiol-1,4, 2-methylglutaric acid and / or 2-ethylsuccinic acid or derivatives thereof are prepared by polycondensation or transesterification of 2-methyl pentanediol-1,5, optionally with the concomitant use of other organic acids and polyhydric Polycarbon aliphatic alcohols.; The polyester polyols according to the invention are suitable for the production of compact or cellular polyurethane or polyurethane material Polyharn plastics, preferably polyurethane elastomers, after the poly isocyanate polyaddition process.