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Composition comprising encapsulated substrate with thermoplastic polymer overcoating

  • US 5,187,011 A
  • Filed: 01/09/1992
  • Issued: 02/16/1993
  • Est. Priority Date: 12/04/1989
  • Status: Expired due to Fees
First Claim
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1. An encapsulated particulate composition comprising:

  • (a) a solid particulate substrate;

    (b) a coating substantially free of pinholes comprising an ionically and convalently crosslinked neutralized sulfonated elastomeric polymer having a thickness of at least about 1 micron deposited on the surface of particles of said substrate, wherein said crosslinked neutralized sulfonated polymer encapsulates said substrate, wherein said crosslinked neutralized sulfonated polymer is permeable to said substrate at conditions of use and said crosslinked neutralized sulfonated polymer is non-reactive to said substrate, and(c) a layer of thermoplastic polymer overcoating said coating.

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