Thermosettable resins and frictional materials made therefrom

Abstract

Abstract Superior frictional materials are formed by heating under pressure in the presence of a filler, e.g., asbestos, and a source of formaldehyde, e.g., hexamethylenetetramine, the polymers formed by reacting (1) a mixture of compounds selected from the group having the formula R.sub.1 --A--CH.sub.2 --OCH.sub.2 --.sub.y A--.sub.x CH.sub.2 --OCH.sub.2 -- y R 3 wherein each A is an independently selected aromatic radical having the formula ##STR1## WHEREIN EACH R 1 represents an independently selected radical from the group consisting of hydrogen, --CH 2 --OCH 2 -- y R 3 ; each R 2 represents an independently selected radical selected from the group consisting of R 1 , halogen or an alkyl group of 1 to 10 carbon atoms; R 3 represents a radical selected from the group consisting of hydrogen, methoxy, ethoxy, propoxy or --A--H; x represents an integer from 0 to 60; y represents an integer from 0 to 4; z represents an integer from 0 to 2; and B represents oxygen or sulfur; provided that if x is 0 and A is diphenyloxide, then y must be 1 or greater; which mixture may contain up to 50% by weight unreacted aromatic HAH; with (2) at least one monomeric reactant selected from the group ##STR2## WHEREIN R represents hydrogen, alkyl or aryl of 1 to 20 carbon atoms and ##STR3## M REPRESENTS AN INTEGER FROM 1 TO 3; O REPRESENTS AN INTEGER FROM 1 TO 5; P REPRESENTS AN INTEGER FROM 0 TO 3; B represents oxygen, sulfur or C 1 to C 3 alkylidene and q represents an integer from 0 to 1; and finally with (3) formaldehyde in the presence of an acid catalyst at a temperature of from between about 90° C to about 190° C for from several minutes to several hours.

Inventors

• 👤 Benton Paul Webb
• 👤 Donald Louis Nelson

Bibliographic Details