Quinone diimine as a rubber additive
AssigneeFlexsys America L.P.
InventorFrederick Ignatz-Hoover
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Abstract
The invention relates to the high temperature mixing of elastomeric material in the presence of a quinone diimine antidegradant and carbon black, prior to vulcanization. By mixing the antidegradant quinone diimine with the elastomer prior to vulcanization, enhanced handling and processing qualities are realized in the vulcanized rubber.
Claims16
A process for enhancing the handling and processing properties of vulcanized rubber wherein the process comprises addition of one or more quinone diimine antidegradants to an unvulcanized rubber composition and mixing to a temperature at or above 140° C. prior to a vulcanization step.
A process for enhancing vulcanized rubber properties wherein the process comprises:
- a) adding one or more elastomeric materials to a mixer;
- b) adding at least one quinone diimine antidegradant to the elastomeric material(s);
- c) mixing the combination of steps (a) and (b)for a period of about zero to about two minutes at an initial temperature of about 60° C. to about 100° C.;
- d) adding carbon black, zinc oxide and stearic acid to the mixture of step (c) and continue mixing for about two to about eight minutes or until the temperature reaches about 140° C. to about 180° C.;
- e) discharging the mixture of step (d) from the mixer;
- f) adding curatives, accelerators, processing aids, modifiers, tackifiers and conventional rubber processing aids;
- wherein the composition of step (f) is subsequently vulcanized thereby producing a vulcanized rubber composition having enhanced handling and processing properties.
Dependencies are inferred from the claim text.