Patent ID: 7695346

Claim:
An abrasive for blast processing a surface to be processed of a workpiece, comprising: a base material as an elastic body; and abrasive grains, wherein the abrasive grains of 10 to 90% by weight are compounded and dispersed into the base material of 90 to 10% by weight, a) a portion of said abrasive grains communicating with an exterior surface of said base material as said elastic body; b) said base material including a raw material polymer and compounding agents in order to adjust an impact resilience modulus of said base material; c) said compounding agents including a filler for obtaining an abrasive density adapted to the blast processing; a1) said base material having a property of wearability and crushability by impacts or frictional engagement with said surface to be processed of the workpiece during said blast processing, and said abrasive gains are continually exposed said communicating portions with said base material onto said exterior surface; a2) said base material providing means to cushion impact force of said abrasive against said surface to be processed of the workpiece during said blast processing; a3) said base material providing lower impact resilience to said abrasive subsequent to impacting said surface to be processed of the workpiece, said lower impact resilience being a resilience provided to minimize recoil of said abrasive from said surface to be processed of the workpiece as well as allowing said abrasive to slide across said surface to be processed of the workpiece subsequent to impacting said surface to be processed of the workpiece; and d) said abrasive being formed into a granule.