Process for producing low-monomer-content organic polyisocyanates

Process for producing low-monomer-content organic polyisocyanates

  • CN 101,903,360 A
  • Filed: 12/04/2008
  • Published: 12/01/2010
  • Est. Priority Date: 12/18/2007
  • Status: Active Application
First Claim
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1. be used to produce the method that has less than the polyisocyanates of 1.0 weight % monomeric diisocyanate residual content, be characterised in that:

  • A) by one or more vulcabond of at least 60 weight % and the isocyanate component that constitutes of the isocyanic ester of one or more monoisocyanates of 40 weight % and/or one or more functionality 〉

    =3 at the mostB) randomly use catalyst B

         1) and/or optional reactive component B2) at thinner C) in carry out oligomerization with the drop form 0-200 ℃

    of temperature, implement then to be separated;

    Before being separated, in the process or afterwards, randomly by adding catalyzer poison D) interrupt reaction;

    Make the middle mutually polyisocyanates that exists of isocyanic ester remove excess monomer subsequently.

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