Polyester compositions, water-dispersible polyester-aminoplast condensation resins made therefrom, and methods for producing them

Claim 1

A COMPOSITION COMPRISING AN AQUEOUS DISPERSION OF A SALT OF A CONDENSATION PRODUCT OF (1) ABOUT 40 TO 60 PARTS BY WEIGHT OF A XYLENE-SOLUBLE BUTYLATED POLYMETHYLOL MELAMINE WITH (2) ABOUT 40 TO 60 PARTS BY WEIGHT OF A POLYESTER DEFINED HEREINAFTER, SAID DISPERSION BEING OBTAINED BY HEATING A MIXTURE OF (1) AND (2) ABOVE IN THE PROPORTIONS STATED, TO EFFECT REACTION THEREBETWEEN, IN AN ORGANIC SOLVENT AT A TOTAL CONCENTRATION OF (1) AND (2) IN THE RANGE OF 50 TO 90% BY WEIGHT AND SUBSEQUENTLY NEUTRALIZING THE REACTION MASS WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AQUEOUS AMMONIA AND WATER-SOLUBLE, VOLATILE AMINES, SAID POLYESTER CONTAINING HYDROXYL GROUPS AND FREE CARBOXYL GROUPS AND HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 800 TO 1500 AND AN ACID NUMBER BETWEEN ABOUT 90 AND ABOUT 100, THE POLYESTER BEING A CONDENSATION PRODUCT OF AN AROMATIC MEMBER SELECTED FROM THE GROUP CONSISTING OF O-PHTHALIC ACID AND ITS ANHYDRIDE WITH A CONDENSATION PRODUCT SELECTED FROM THE GROUP CONSISTING OF (A) POLYESTERS HAVING AN ACID VALUE OF NOT OVER 10 AND OBTAINED FROM THE CONDENSATION OF A MIXTURE OF AT LEAST ONE DIBASIC ALIPHATIC ACID HAVING 5 TO 10 CARBON ATOMS WITH AT LEAST ONE ALIPHATIC 2-CARBON TO 10-CARBON ATOM POLYOL, SAID POLYOL CONSISTING OF POLYOL MOLECULES HAVING 2 TO 6 HYDROXYL GROUPS AND CONTAINING AT LEAST 50 MOLE PERCENT OF TRIMETHYLOLETHANE, THE PROPORTIONS IN THE MIXTURE BEING IN THE RANGE OF 1.2 TO 1.8 MOLES OF POLYOL TO EACH MOLE OF ACID, AND (B) POLYESTERS AS OBTAINED IN (A) BUT MODIFIED BY CONDENSATION WITH A FATTY ACID HAVING 8 TO 30 CARBON ATOMS, SAID MODIFIED POLYESTERS HAVING AN ACID VALUE OF NOT OVER 10; THE PROPORTION OF THE AROMATIC MEMBER TO THE TOTAL POLYOL BEING IN THE RANGE OF 2 TO 3.5 MOLES OF THE FORMER FOR EACH 3 MOLES OF THE LATTER.