Method for preparing and compositions of epoxy resin esters precondensed with phenoplastic or aminoplastic resins

Abstract

Abstract WATER-DILUTABLE, HEAT-CURABLE COATING COMPOSITIONS PREPARED BY: (I) FORMING PARTIAL ESTERS OF COMPOUNDS CONTAINING EPOXY GROUPS OR HYDROXYL GROUPS BY HYDROLYTIC DISSOCIATION OF THE EPOXY GROUPS WITH ADDUCTS OF MALEIC ACID WITH FATTY ACIDS OR MALEIC ANHYDRIDE WITH FATTY ACIDS, THE FATTY ACIDS CONSISTING OF DRYING OIL ACIDS, SEMI-DRYING OIL ACIDS AND MIXTURES OF THE OIL ACIDS WITH ROSIN ACIDS, THE FATTY ACIDS CONTAINING UNSATURATED MONOCARBOXYLIC ACIDS, THE MOLAR PROPORTION OF MONOCARBOXYLIC ACID TO MALEIC ACID OR MALEIC ANHYDRIDE BEING BETWEEN ABOUT 0.9:1 AND 1.1:1, THE COMPOUNDS CONTAINING EPOXY GROUPS CONSISTING OF EPOXY RESINS HAVING MOLECULAR WEIGHTS OF ABOUT 380 TO 3500; (II) PRECONDESNSING BY HEATING TO 160*C. ABOUT 99 TO 50 PERCENT BY WEIGHT OF THE PARTIAL ESTERS WITH ABOUT 1 TO 50 PERCENT BY WEIGHT OF HEAT-CURABLE, WATERDILUTABLE LOW MOLECULAR WEIGHT CONDENSATION PRODUCTS OF PHENOPLAST RESINS, AMINOPLAST RESINS OR MIXTURES THEREOF; (III) NEUTRALIZING THE PRECONDENSED PRDUCT WITH A BASIC MATERIAL; AND (IV) DILUTING THE NEUTRALIZED PRODUCT WITH WATER; IN A PARTICULAR EMBODIMENT THE STEPS OF THE PROCESS ARE VARIED WHEREIN THE EPOXY RESINS ARE FIRST PRECONDENSED WITH THE PHENOPLAST OR AMINOPLAST RESINS AND THEN THE EPOXY GROUPS OF THE EPOXY RESINS ARE REACTED WITH THE ADDUCTS OF MALEIC ACID AND MALEIC ANHYDRIDE.

Inventors

• 👤 Rolf Guldenpfennig

Bibliographic Details