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Method of removing coating films

  • US 5,542,982 A
  • Filed: 02/01/1995
  • Issued: 08/06/1996
  • Est. Priority Date: 09/25/1992
  • Status: Expired due to Term
First Claim
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1. A method for removing a cured coating film of a thermosetting resin composition from surfaces of polyolefin resin substrates, comprising the steps of:

  • treating crushed particulates of polyolefin resin substrates having a particle size in a range of from 0.5 to 20 mm, in an aqueous alkali solution having a concentration of 0.2 to 4.0% by weight at a temperature of 110°

    C. or higher, but lower than a melting point of said substrates to obtain treated resin substrate particulates;

    contacting the treated resin substrate particulates with each other, thereby removing said cured coating film from said particulates by shearing force in a screw feeder polishing machine or in a polishing machine equipped with a high-speed vessel stirrer; and

    recycling resulting treated particulates which have had said cured coating film removed for reuse as polyolefin resin.

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