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Polymeric isocyanates and their manufacture

  • US 2,978,449 A
  • Filed: 11/12/1957
  • Issued: 04/04/1961
  • Est. Priority Date: 11/16/1956
  • Status: Expired due to Term
First Claim
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1. A PROCESS FOR THE PREPARATION OF ISOCYANATE GROUPCONTAINING ISOCYANURATE COMPOUNDS BY POLYMERIZING ORGANIC POLYISOCYANATES COMPRISING POLYMERIZING AN ORGANIC POLYISOCYANATE AT A TEMPERATURE FROM AROUND ROOM TEMPERATURE TO BELOW 200*C. IN THE PRESENCE OF LEAD 2-ETHYLHEXOATE AND INTERRUPTING THE REACTING AFTER THE FORMATION OF ISOCYANURATE RINGS DETECTABLE BY INFRA-RED ABSORPTION AT 5.85 TO 7.05 MICRONS.

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