Abstract: Novel poly-(carbonate-urethane)-triols which are liquid at room temperature, have a molecular weight of less than 5000, and are of the formula: ##STR1## wherein A is an alkylene or cycloalkylene group, R is an alkylene group having up to 4 carbon atoms, Z is an alkyl group having up to 4 carbon atoms, n is a number representing the degree of polymerization, and m is 0 or 1.These poly-(carbonate-urethane)-triols are prepared by a transesterification reaction between an alkyl or aryl carbonate, at least one aliphatic or cycloaliphatic diol, and a primary or secondary dialkanolamine, the dialkanolamine being present in such an amount that there is statistically one molecule of the dialkanolamine per polymer chain.The poly-(carbonate-urethane)-triols are useful for the production of aminoplast resins which can be used, for example, as stoving lacquers.

Abstract: Aliphatic or cycloaliphatic polycarbonate-triols having a molecular weight of not more than 3,000, which contain hydrophobic segments and are liquid at room temperature are obtained by transesterifying an aryl carbonate with a primary aliphatic triol and a mixture of two diols, HOAOH and HOBOH, at least one of the radicals A or B being a hydrophobic radical, the proportion of the primary aliphatic triol is such that there is statistically one molecule of the said triol per polymer chain in the product, and the ratio of the diols being such that the polycarbonate-triol obtained is equivalent to a mixture of a% by weight of a polycarbonate derived from the triol and the diol HOAOH alone, and of b% by weight of a polycarbonate derived from the triol and the diol HOBOH alone, the percentages a and b corresponding to the following two conditions:30%.ltoreq.a%.ltoreq.70%a%+b%=100%.Modified aminoplast resins can be obtained by reacting such polycarbonate-triols with etherified melamine-formaldehyde condensates.

Abstract: Novel poly-(carbonate-urethane)-triols which are liquid at room temperature, have a molecular weight of less than 5000, and are of the formula: ##STR1## wherein A is an alkylene or cycloalkylene group, R is an alkylene group having up to 4 carbon atoms, Z is an alkyl group having up to 4 carbon atoms, n is a number representing the degree of polymerization, and m is 0 or 1. These poly-(carbonate-urethane)-triols are prepared by a transesterification reaction between an alkyl or aryl carbonate, at least one aliphatic or cycloaliphatic diol, and a primary or secondary dialkanolamine, the dialkanolamine being present in such an amount that there is statistically one molecule of the dialkanolamine per polymer chain.The poly-(carbonate-urethane)-triols are useful for the production of aminoplast resins which can be used, for example, as stoving lacquers.