Liquid isocyanurate-modified polymethylene polyphenylene...

Details Liquid isocyanurate-modified polymethylene polyphenylene... Liquid isocyanurate-modified polymethylene polyphenylene...

C - Chemistry, Metallurgy

08

G

400/111, 403/32

C08G 18/79 (2006.01) C07D 251/34 (2006.01) C08G 18/02 (2006.01) C08G 18/72 (2006.01)

Patent

CA 1307603

LIQUID ISOCYANURATE-MODIFIED POLYMETHYLENE BIS(PHENYLISOCYANATE) COMP0SITIONS CONTAINING A HIGH TWO-RING METHYLENE BIS(PHENYLISOCYANATE) CONTENT Abstract of the Disclosure A method for producing liquid isocyanurate modified Polymeric MDI composition containing a high two-ring MDI content, and foams made therefrom is described. The method comprises trimerizing a polymeric MDI in the presence of catalytically effective amount of a trimerization catalyst to form an isocyanurate containing polyisocyanate having a viscosity of about 100,000 mPas. The trimerization catalyst is thereafter deactivated and the isocyanurate-modified polyisocy- anate is blended with a methylene bis(phenylisocyanate (MDI) to form a final product having a two-ring content of about 60 percent of the total ring content and a viscosity comparable to polymeric MDI. Foams produced using this liquid isocyanurate modified polymeric MDI are of a substantially lighter color than those produced from standard polymeric MDI.

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