Abstract: This disclosure provides methods for grinding biochar composition for use as a filler in elastomeric compositions. Such methods include providing a biochar composition comprising particulate, and grinding the biochar composition with a grinding fluid until the biochar is characterized as having an average particulate size less than substantially 1 micrometer. Optionally, such methods may include passivating the biochar composition during or after grinding by covering a sufficient portion of the surface pores sized 10 nanometer and smaller of the particulate forming the ground biochar composition. Curable elastomeric compositions including biochar and cured elastomeric products are also provided.

Abstract: Particular embodiments of the invention concerns methods of forming a retreaded tire with improved tread edge area bonding, and re-treaded tires formed thereby. One embodiment of such methods includes forming an unbonded retreaded tire by arranging a pre-cured tread annularly around an annular tire carcass with a bonding layer arranged there between. The pre-cured tread includes a pair of opposing tread edges laterally-spaced to define a width of the pre-cured tread. The method also includes bonding the tread of the unbonded tire to the tire carcass to form a bonded retreaded tire by sufficiently pressurizing and heating the curing chamber to cure the bonding layer of the unbonded tire, which includes at least partially bonding a pair of laterally-spaced tread edge areas of the pre-cured tread to the tire carcass prior to an intermediate portion of the pre-cured tread located between the pair of laterally-spaced tread edge areas.