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US 6,433,059 B1Granted
Method for preparing binder materials containing diisocyanates
AssigneeSantee, Inc.
InventorCharles L. Capps
Life of this patent
Estimating the term…
Abstract
A method for preparing a binder material for cellulosic products which comprises providing a polymeric resin base material preferably comprising 4,4′ or 2,4′ methylene diphenylene diisocyanate in the range of from about 20% to about 55% by weight and a functionality greater than about 2, forming a colloidal gel from silica and a basic solution, and incorporating the colloidal gel into the polymeric base material at a temperature, rate of addition and agitation level to achieve a substantially homogeneous binder material.
Claims4
A method for preparing a binder material for cellulosic products comprising:
- a) providing a polymeric resin base material comprising 4,4′ or 2,4′ methylene diphenylene diisocyanate in the range of from about 20% to about 55% by weight and an isocyanate functionality greater than 2, wherein said polymeric base resin material contains isocyanate polymeric by-products obtained as a result of the manufacture of MDI and incorporates oligomers of the diisocyanate;
- b) forming a colloidal silica from silica and a basic solution;
- c) incorporating the colloidal silica into said polymeric base material at a temperature, rate of addition and agitation level to achieve a substantially homogeneous cellulosic binder material.
Dependencies are inferred from the claim text.