Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1987-09-14
1988-05-10
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
25218221, 544180, 544193, C08G 1814
Patent
active
047436271
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.
REFERENCES:
patent: 4148980 (1979-04-01), Narayan
patent: 4243756 (1981-01-01), Cenker et al.
patent: 4284730 (1981-08-01), Narayan et al.
patent: 4382125 (1983-05-01), Narayan et al.
Kan Peter T.
Narayan Thirumurti
BASF Corporation
Michaels Joseph D.
Panagos Bill C.
Welsh Maurice J.
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