Liquid isocyanurate-modified polymethylene bis(phenylisocyanate) compositions containing a high two-ring methylene bis(phenylisocyanate) content
US4743627A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1987 |
| Grant date | May 10, 1988 |
| Priority date | — |
| Expiry date | Sep 14, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/794
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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 polyisocyanate 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.