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Methods for devolatilizing resin solutions and resins produced thereby

  • US 20080139700A1
  • Filed: 12/11/2006
  • Published: 06/12/2008
  • Est. Priority Date: 12/11/2006
  • Status: Abandoned Application
First Claim
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1. In a method of continuously devolatilizing a liquefied material, utilizing an extruder comprising a barrel defining an interior space in which is disposed a plurality of intermeshing conveying screws for advancing a flow of the liquefied material within the interior space from an extruder inlet to an extruder outlet, the method comprising the steps of:

  • A. providing, as the liquefied material to be devolatilized, a mixture of resin selected from the group consisting of acrylic resins and urethane (meth)acrylate resins and a solvent for the resin;

    B. continuously advancing the flow of material from the extruder inlet to the extruder outlet by the conveying screws;

    C. introducing heat from an external source into the flow of liquefied material during step B for promoting the separation of gaseous volatiles from the liquefied material; and

    D. venting separated gaseous volatiles from the interior space at a plurality of venting locations along the direction of travel by communicating the interior space with respective vapor escape ports, each port is being sufficiently large to prevent the linear vapor velocity of vapor escaping therethrough from exceeding about 10-15 f/sec.

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