Rubber composition for an inner liner for pneumatic vehicle tyres

Abstract

The invention relates to a rubber composition comprising a rubber component that comprises at least one halobutyl rubber selected from the group consisting of bromobutyl rubber and chlorobutyl rubber; and a filler component that comprises at least one filler F1 which has a 14C content in the range of 0.20 to 0.45 Bq/g of carbon; a carbon content in the range of 60 wt. % to 85 wt. % relative to the ash-free and water-free filler; an STSA surface area in the range of 10 m2/g of filler to 50 m2/g of filler; and acidic hydroxyl groups on its surface; and wherein the proportion of halobutyl rubber in the rubber composition is 70 to 100 phr. The invention further relates to a vulcanisable and a vulcanised rubber composition based on the aforementioned rubber composition, a kit of parts for preparing the vulcanisable rubber composition, and methods for preparing the rubber composition and the vulcanisable rubber composition. Furthermore, the invention relates to a method for further processing the vulcanisable rubber composition, wherein webs are formed which are suitable, when cut to size, for use as inner liners in a method for manufacturing a pneumatic tyre. The invention also relates to the use of the aforementioned hydrothermally carbonised lignin for the preparation of rubber compositions for inner liners.

Dependencies are inferred from the claim text.