Elastic blocks and process for producing the same
AssigneeHayakawa Rubber Company Limited
InventorsHirofumi Kakimoto, Masanori Igaki
Life of this patent
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Abstract
An elastic block, which is adapted to be paved on an underlying base for absorbing impacts, includes a laminate composed of a powdery rubber-containing layer and a vulcanized rubber layer underlying the powdery rubber-containing layer, the powdery rubber-containing layer being a compression molded layer composed of a mixture comprising elastic chips having the particle size of 0.5 to 10 mm and a resin binder, the vulcanized rubber layer being a vulcanized molding of an unvulcanized rubber layer, wherein the elastic chips are fixedly bonded to one another with the resin binder and the powdery rubber-containing layer is adhered to the vulcanized rubber layer when the mixture layer and the unvulcanized rubber layer are subjected to pressurization and vulcanization.
Claims20
An elastic block adapted to be paved on an underlying base for absorbing impacts, said elastic block consisting essentially of a laminate composed of a monolithic powdery rubber-containing layer and a vulcanized rubber layer underlying the powdery rubber-containing layer;
- said powdery rubber-containing layer being a compression molded layer composed of a mixture comprising elastic chips having a particle size of 0.5 to 10 mm and a resin binder at least 5 parts by weight relative to 100 parts by weight of the elastic chips, and said vulcanized rubber layer, having a thickness of 5-60% of that of the elastic block, being a vulcanized molding of an unvulcanized rubber layer;
- wherein the elastic chips are fixedly bonded to one another with the resin binder and the powdery rubber-containing layer is adhered to the vulcanized rubber layer when the mixture layer and the unvulcanized rubber layer are subjected to pressurization and vulcanization;
- and
- wherein upward warping is suppressed to less than 2 mm after immersion of a lower surface portion of the elastic block in water at 40° C. for one month.
An elastic block adapted to be paved on an underlying base for absorbing impacts, said elastic block consisting essentially of a laminate composed of a monolithic powdery rubber-containing layer and a vulcanized rubber layer underlying the powdery rubber-containing layer;
- said powdery rubber-containing layer being a compression molded layer composed of a mixture comprising elastic chips having a particle size of 0.5 to 10 mm and a resin binder at least 5 parts by weight relative to 100 parts by weight of the elastic chips, and said vulcanized rubber layer, having a thickness of 5-60% of that of the elastic block, being a vulcanized molding of an unvulcanized rubber layer;
- wherein the elastic chips are fixedly bonded to one another with the resin binder and the powdery rubber-containing layer is adhered to the vulcanized rubber layer when the mixture layer and the unvulcanized rubber layer are subjected to pressurization and vulcanization;
- and
- wherein step formation is suppressed to less than 2 mm after immersion of a lower surface portion of the elastic block in water at 40° C. for one month and paving on outdoor concrete floors.
Dependencies are inferred from the claim text.