METHOD FOR PRODUCING INTERNAL SEALING LAYER OF PNEUMATIC TYRE Russian patent published in 2016 - IPC B29D30/00 

FIELD: chemistry.

SUBSTANCE: result is achieved by producing a continuous flat sheet of elastometic material for an internal sealing layer of a pneumatic type, wherein provided is a continuous sheet having an average thickness of 10 to 500 mcm and comprising a dynamically vulcanised mix of process resin and functionalised poly(isobutylene/alkyl styrene copolymer), as well as the plasticiser alkyl- or aryl sulphonamide in an amount of 10 wt % by weight of the continuous flat sheet. That is followed by heating a surface of the continuous flat sheet in the presence of a fluid oxygen medium for at least 30 seconds at temperature within the range of 60°C to 250°C, whereas tensioning of a continuous section of the elastometic material makes less than 5.0 g/cm·mcm. Thereafter, a reaction product formed by heating is recovered. The continuous sheet is then cooled down to form a thermally treated continuous flat sheet, wherein the plasticiser content is less than in the above continuous flat sheet.

EFFECT: reducing air permeability of the material.

7 cl, 3 dwg, 4 tbl