Elastomer coated filler and composites thereof comprising at least 60 by weight of a hydrated filler and an elastomer containing an acid substituent

摘要

The impact resistance of flame retardant composites, especially thermoplastic molding: compounds containing over 60 hydrated mineral filler such as Al(OH)3 or Mg(OH)2 as improved by coating the filler with 1 to 20 of an elastomer. The composite will fail by crazing or shearing rather than by brittle fracture. A well bonded elastomeric interphase resulted by utilizing acidic substituted resins such as ethyl-hexyl acrylate-acrylic acid copolymers which bond to and are cross-linked by the basic filler particles. Further improvement in impact resistance was provided by incorporating 1 to 10 of a resin fiber reinforcement such as polyvinyl alcohol fibers that decompose to yield at least 30 water when heated to decomposition temperature.