Claims
- 1. A rubber compounding additive suitable for incorporation into a vulcanizable rubber composition containing a vulcanizable rubber polymer which comprises a major amount of rubber reinforcing finely-divided siliceous pigment and a minor amount of an organic coupling agent the functional groups of which consist essentially of at least one sulfur functional group capable of bonding to a vulcanizable rubber polymer and at least two amino or imino nitrogen functional groups capable of bonding to the siliceous pigment, the ratio of nitrogen functional group to sulfur functional group being at least 2:1, said amount of coupling agent being sufficient to improve the abrasion resistance of a vulcanizate into which it is incorporated.
- 2. The addition of claim 1 wherein there is from about 5 to 60 parts of siliceous pigment per part of coupling agent.
- 3. The additive of claim 1 wherein there is from about 10 to 40 parts of siliceous pigment per part of coupling agent.
- 4. The additive of claim 1 wherein the nitrogen functional group is a primary, secondary or tertiary amino groups and mixtures of such groups.
- 5. The additive of claim 4 wherein the coupling agent contains at least 5 nitrogen functional groups per molecule.
- 6. The additive of claim 1 wherein the coupling agent is a mercaptoalkylated poly(alkyleneimine).
- 7. The additive of claim 1 wherein the coupling agent is a mercaptoalkylated polyethyleneimine.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division application of our copending application U.S. Ser. No. 405,725, filed Oct. 11, 1973, now U.S. Pat. No. 3,884,285, for ABRASION-RESISTANT RUBBER COMPOSITIONS, which copending application is a continuation-in-part application of our application U.S. Ser. No. 187,838, filed Oct. 8, 1971 for Abrasion-Resistant Rubber Compositions, now abandoned.
US Referenced Citations (11)
Divisions (1)
|
Number |
Date |
Country |
Parent |
405725 |
Oct 1973 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
187838 |
Oct 1971 |
|