Abstract: In some variations, this disclosure provides compositions for reducing fluid permeability through a polymer membrane, the composition comprising a polymer (e.g., bromobutyl rubber) and mineral particles (e.g., kaolin particles) including fine particles with particle sizes between about 0.05 ?m and about 1 ?m and coarse particles with particle sizes between about 3 ?m and about 20 ?m. Applications for these improved-barrier polymers include tire innerliners, paint and paper coatings, films, adhesives, liners, paints, and hoses, for example. Methods of making and use these polymers are also disclosed.

Abstract: In some variations, this disclosure provides compositions for reducing fluid permeability through a polymer membrane, the composition comprising a polymer (e.g., bromobutyl rubber) and mineral particles (e.g., kaolin particles) including fine particles with particle sizes between about 0.05 ?m and about 1 ?m and coarse particles with particle sizes between about 3 ?m and about 20 ?m. Applications for these improved-barrier polymers include tire innerliners, paint and paper coatings, films, adhesives, liners, paints, and hoses, for example. Methods of making and use these polymers are also disclosed.

Abstract: Vulcanizable elastomeric compounds having enhanced viscoelastic properties include 100 parts by weight of at least one diene-based elastomer, and from about 30 to about 160 phr of filler. The filler may contain zinc sulfate (with an average particle size of about 0.5-1.0 microns), barium sulfate (with an average particle size of about 1.0-2.0 microns) and/or titanium dioxide (with an average particle size of about 0.05-1.0 microns).