Rubber mixtures
The invention relates to rubber mixtures, wherein these comprise at least one rubber, excluding silicone rubber, and at least one silatrane of general formula (I) G-Si(—O—CX 1 X 2 —CX 1 X 3 —) 3 N (I) The rubber mixture is produced by mixing at least one rubber and a silatrane of formula (I). The silatrane of formula (I) may be used as a secondary accelerator in rubber mixtures.
1. A process for producing a rubber article, the process comprising subjecting at least one rubber composition, excluding silicone rubber, comprising a synthetic rubber, a natural rubber, or both to vulcanization in the presence of at least one accelerator comprising at least one silatrane of formula (I):
G-Si(—O—CX 1 X 2 —CX 1 X 3 —) 3 N (I);
at least one of a silica, a carbon black, or mixtures thereof;
at least one treated distillate aromatic extract oil; and
at least one fatty acid,
wherein:
G is a monovalent, unbranched or branched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic (C 2 -C 8 )-hydrocarbon chain; and
X 1 , X 2 and X 3 each independently of one another represent hydrogen (—H), or a straight-chain unsubstituted or branched unsubstituted (C 1 -C 10 )-alkyl-.
2. The process according to claim 1 , wherein the silatrane of formula (I) is:
CH 3 —CH 2 —CH 2 —Si(—O—CH 2 —CH 2 —) 3 N.
3. The process according to claim 1 , wherein the at least one silatrane of formula (I) is present in an amount of 0.1 to 8 parts by weight, based on 100 parts by weight of the at least one rubber.
4. The process according to claim 1 , wherein the at least one rubber composition further comprises reaction accelerator, antioxidant, heat stabilizer, light stabilizer, antiozonant, processing aid, plasticizer, resin, tackifier, blowing agent, dye, pigment, wax, extender, organic acid, retarder, metal oxide, activator, or one or more combinations thereof.
5. The process according to claim 1 , wherein the at least one rubber composition is free of guanidine derivatives.
6. The process according to claim 5 , wherein the guanidine derivative is, diphenylguanidine.
7. The process according to claim 1 , wherein vulcanization is conducted at a temperature of 100° C. to 200° C.
8. The process according to claim 1 , wherein vulcanization is conducted at a temperature of 120° C. to 180° C.
9. The process according to claim 8 , wherein vulcanization is conducted at a pressure of 10 to 200 bar.
10. The process according to claim 1 , wherein the rubber article is selected from the group consisting of a pneumatic tire, a tire tread, a rubber-containing tire component, a cable sheathing, a hose, a drive belt, a conveyor belt, a roller covering, a shoe sole, a sealing ring and a damping element.