| 摘要 |
A process for the preparation of a polymer from (1) a polycarboxylic acid comprising at least 75% dimerized fat acid, (2) urea or thiourea, and (3) an organic diamine containing from 4 to about 36 carbon atoms, the mole ratios of (1) and (2) being in the range of about 9:1 to 2.5:7.5 and the mole ratio of (1) plus (2) to (3) being about 1:1 comprises heating the reactants at a temperature of at least 120 DEG C. The term "fat acid" is defined as being a natural or synthetic, saturated, ethylenically unsaturated or acetylenically unsaturated monobasic aliphatic acid having a hydrocarbon chain of 8 to 24 carbon atoms, many such acids being specified. Exemplified diamines are 1:2- and 1:3-diaminobutane, bis-aminoalkyl ethers and tetramethylene, pentamethylene, hexamethylene, nonamethylene, decamethylene, cyclohexene, m-xylylene, p-xylylene and phenylene diamine. Dicarboxylic acids which may be present in the reaction mixtures are adipic, azeleic, sebacic, terephthalic and isophthalic acids. Reference has been made by the Comptroller to Specification 773,964. |
