PROCESS FOR COPOLYMERIZATION OF AROMATIC AND ALIPHATIC POLYISOCYANATES TO FORM POLYISOCYANURATES

• US 3,645,979 A
• Filed: 01/25/1967
• Issued: 02/29/1972
• Est. Priority Date: 02/02/1966
• Status: Expired due to Term

• Current Assignee: Altner Wilhelm, Liebsch Dietrich
• Original Assignee: Altner Wilhelm, Liebsch Dietrich
• Inventors: LIEBSCH DIETRICH, ALTNER WILHELM
• Application Number:
  US04/611,693
• Time in Patent Office: 1,861 Days
• US Class Current: 528/51
• CPC Class Codes: B41L 11/00 Apparatus for directly duplicating from hectographic masters in mirror image, i.e. "wet duplicators" for producing positive copies
• CPC Class Codes: B41P 2700/10 Hectographic line duplicators
• CPC Class Codes: C08G 18/022 the polymeric products containing isocyanurate groups
• CPC Class Codes: C08G 18/795 formed by oligomerisation of mixtures of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates with aromatic isocyanates or isothiocyanates
• CPC Class Codes: Y10S 521/902 Cellular polymer containing an isocyanurate structure
• CPC Class Codes: Y10S 528/905 Polymer prepared from isocyanate reactant has adhesive property

Abstract

A METHOD FOR PREPARING POLYISOCYANATES HAVING AT LEAST ONE ISOCYANURATE RING WHICH COMPRISES POLYMERIZING AN AROMATIC AND AN ALPHATIC OR ARALIPHATIC POLYISOCYANATE IN THE PRESENCE OF AN ORGANIC PHOSPHINE, THE ALIPHATIC OR ARALIPHATIC POLYISOCYANATE BEING PRESENT IN SUCH AN AMOUNT THAT MORE THAN ABOUT 0.5 ALIPHATICALLY BOUND -NCO GROUP IS PRESENT PER AROMATICALLY BOUND-NCO GROUP, PREFERABLY 0.5 TO 10. THE PRODUCTS PER SE HAVE UTILITY AS ADHESIVES, LACQUERS, CASTING RESINS, AND FOAMS, AND ALSO AS THE ISOCYANATE COMPONENT IN OTHER REACTIVE SYSTEMS.

Claims