Benton Paul Webb

US Patent:

40961087, Jun 20, 1978

Filed:

May 17, 1976

Appl. No.:

5/687132

Inventors:

Benton Paul Webb - Richwood TX
Donald Louis Nelson - Lake Jackson TX

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08K 334

US Classification:

260 38

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 --. sub. y R. sub. 3 wherein each A is an independently selected aromatic radical having the formula ##STR1## WHEREIN EACH R. sub. 1 represents an independently selected radical from the group consisting of hydrogen, --CH. sub. 2 --OCH. sub. 2 --. sub. y R. sub. 3 ; each R. sub. 2 represents an independently selected radical selected from the group consisting of R. sub. 1, halogen or an alkyl group of 1 to 10 carbon atoms; R. sub. 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. sub. 1 to C. sub.