| abstract |
A blend of rubber comprising 100 parts of a rubber, from 5 to 150 parts of a carbazole/phenol/formaldehyde resin, from 1 to 5 parts of a vulcanizing agent for the rubber and from 5 to 15 parts per hundred parts of the resin of a formaldehyde donor, is made up. This is done in any usual manner. The blend is then heated, preferably under pressure, to vulcanize the rubber and cross-link the resin. A preferred method of making the resin is described. The invention also comprises reinforced rubbers made according to the process. |