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Expanded hollow micro sphere composite beads and method for their production

  • US 6,225,361 B1
  • Filed: 04/06/2000
  • Issued: 05/01/2001
  • Est. Priority Date: 07/28/1999
  • Status: Expired due to Fees
First Claim
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1. A process for producing expanded hollow micro sphere composite beads which comprise admixing an expanded hollow thermoplastic polymer micro spheres with colloidal calcium carbonate to provide composite beads having a hollow expanded thermoplastic polymer micro sphere shell and, as deposited on its surface, colloidal calcium carbonate.

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