Polyurethane foam compositions modified with partially alkylated polymethylolmelamines

Claim 1

A HEAT-RESISTANT CELLULAR RESINOUS ARTICLE WHICH COMPRISES THE PRODUCT PREPARED BY REACTING (A) A PARTIALLY ALKYLATED POLYMETHYLOLMELAMINE COMPOSITION, THE MELAMINE MOLECULES OF WHICH CONTAIN, ON THE AVERAGE, FROM ABOUT 4.5 TO 6 METHYLOL GROUPS OF WHICH, ON THE AVERAGE FROM ABOUT 3 TO 4.5 ARE ETHERIFIED WITH A LOWER ALKANOL, THERE BEING PRESENT IN SAID COMPOSITION, ON THE AVERAGE, AT LEAST 1.2 MORE FREE METHYLOL GROUPS THAN THERE ARE ETHERIFIED METHYLOL GROUPS PER MELAMINE MOLECULE, (B) A POLYFUNCTIONAL POLYOL WHICH HAS A MOLECULAR WEIGHT OF AT LEAST ABOUT 200 AND WHICH IS ALSO A LIQUID AT REACTION TEMPERATURE, SELECTED FROM THE GROUP CONSISTING OF (1) LINEAR POLYMERIZED POLYESTERS HAVING ACID NUMBERS NOT APPRECIABLY IN EXCESS OF ABOUT 60 AND HYDROXYL NUMBERS OF FROM ABOUT 50 TO 700, (2) POLYALKYLENE ETHER GLYCOLS AND (3) N,N,N'',N''-TETRAKIS (2 - HYDROXYPROPYL)-EHTYLENE DIAMINE, AND (C) AN ORGANIC POLYISOCYANATE, THE WEIGHT RATIO OF (A) TO (B) BEING FROM ABOUT 80:20 TO 20:80, RESPECTIVELY, AND THE AMOUNT OF (C) PRESENT BEING FROM ABOUT 30 TO 50 PARTS BY WEIGHT, BASED ON THE TOTAL WEIGHT OF (A), (B) AND (C), IN THE PRESENCE OF (D) FROM ABOUT 0.1-5%, BY WEIGHT, BASED ON THE TOTAL WEIGHT OF (A), (B) AND (C), A FOAMING CATALYST, AND ALLOWING THE REACTION TO PROCEED TO SPONTANEOUS EXOTHERM TEMPERATURE.