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US 5,395,891 AGranted
Rubber mixtures containing polybutadiene gel
AssigneeBayer Aktiengesellschaft
InventorsWerner Obrecht, Peter Wendling, Robert H. Schuster, Andreas Bischoff
Life of this patent
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Abstract
Mixtures of A) polybutadiene gel and B) other rubbers containing C.dbd.C double bonds, the quantity of polybutadiene gel A), based on the sum of A)+B), being 1 to 70% by weight, show as vulcanizates a favorable combination of the properties hysteresis loss and abrasion resistance.
Claims6
A vulcanizate exhibiting improved hysteresis loss and abrasion resistance properties suitable for production of vehicle tires, the vulcanizate being prepared by crosslinking with a suitable crosslinking system a mixture of:
- A) polybutadiene gel which can contain small amounts of soluble components up to about 20% by weight produced by emulsion polymerization in the presence of organic peroxides and optionally cross-linking multifunctional compounds, wherein the crosslinking to form the gel occurs during or after polymerization, the polybutadiene gel having a swelling index in toluene of 1 to 90 and a particle size of 30 to 500 nm;
- with
- B) another rubber selected from the group consisting of EPDM, butyl rubber, nitrile rubber, hydrogenated nitrile rubber, natural rubber, polyisoprene, polybutadiene, and styrene/butadiene copolymers, or vulcanizates thereof, said rubber having a Mooney viscosity of 25 to 150;
- and wherein the total quantity of polybutadiene gel, based on the sum of A) and B) in the vulcanizate, is 1 to 70% by weight.
1 more element
Dependencies are inferred from the claim text.