Patent ID: 6395806
Filing Date: 2002-05-28
Classification: C08G

Abstract:
A process for producing hardeners for epoxy resins, the process comprising:(i) reacting (a) one or more &agr;,&bgr;-unsaturated carboxylic acid esters of the general formula (I), R2R3C&boxH;C(R4)COOR1â€ƒâ€ƒ(I) with (b) one or more hydroxy compounds having one or more hydroxyl groups, wherein R1 represents a hydrocarbon radical having up to 15 carbon atoms, wherein R2, R3, and R4 each independently represents a substituent selected from the group consisting of hydrogen, hydrocarbon radicals having up to 20 carbon atoms, and â€”(CH2)nâ€”COOR1, wherein R1 is as defined above and n represents a number of from 0 to 10, and wherein (a) and (b) are present in quantities such that the equivalent ratio of the hydroxyl groups in (b) to the ester groupsâ€”COOR1 in (a) is from 1.5:1 to 10:1, to form an intermediate product Z1 having a number of ester groups; (ii) reacting the intermediate product Z1 with (c) one or more aminopolyalkylene oxide compounds having at least one aminonitrogen atom with one or more reactive hydrogen atoms, wherein the intermediate product Z1 and the one or more aminopolyalkylene oxide compounds are present in quantities such that the equivalent ratio of reactive hydrogen atoms in (c) to the ester groups in the intermediate product Z1 is from 10:1 to 1:10, to form an intermediate product Z2; (iii) reacting the intermediate product Z2 with (d) one or more polyepoxides having a number of oxirane rings, wherein the intermediate product Z2 and the one or more polyepoxides are present in quantities such that the equivalent ratio of the oxirane rings to the reactive hydrogen atoms in (c) is from 100:1 to 1.5:1, to form an intermediate product Z3 having a number of oxirane rings; and (iv) reacting the intermediate product Z3 with (e) one or more amines selected from the group consisting of primary amines and secondary amines having at least one aminonitrogen atom with one or more reactive hydrogen atoms, wherein the intermediate product Z3 and the one or more amines are present in quantities such that the equivalent ratio of the oxirane rings in the intermediate product Z3 to the reactive hydrogen atoms in (e) is from 1:1.5 to 1:20.