Water free light silica and silicate fillers for cross-linking elastomers
AssigneeDeutsche Gold- und Silber-Scheldeanstalt Vormals Roessler
InventorsPaul Golombeck, Friedrich Hertl
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Abstract
Silica and silicates having a water content of less than 0.5% by weight and specific surface areas of 25 to 300 (.+-. 25) m.sup.2 /g. by the BET procedure are employed as light fillers for the vulcanization of natural rubber and synthetic elastomers with or without counter pressure.
Claims15
A process comprising vulcanizing without the use of pressure a composition consisting essentially of (1) a vulcanizable elastomer, (2) a vulcanizing agent, and (3) a light filler selected from the group consisting of silica and silicates having a water content of not over 0.5% by weight and having a BET specific surface area of 25 to 300 m.sup.2 /g, said silica or silicate having been prepared by wet precipitation followed by drying until practically water free.
Dependencies are inferred from the claim text.