Abstract:
Rigid foam resins containing isocyanurate ring structures prepared by reacting an aromatic amine containing compounds with the usual polyhydroxyls, polyisocyanates and blowing agents in the presence of a trimerization catalyst which are useful as insulating materials.
Abstract:
Novel aromatic diamines having the general formula
WHEREIN N IS AN INTEGER OF FROM 2 TO 8, X is sulfur or oxygen, and R is an n-valent hydrocarbon radical which may be interrupted by O or S atoms and which is obtained by removing OH or SH groups from a polyol or polythiol having a molecular weight of less than 600, are prepared by reacting a compound having the formula (HX)nR where X, n and R are as defined above with about nequivalents of an isatoic acid anhydride in the presence of a strong base. The aromatic diamines of the invention are particularly useful as the active hydrogen containing component for reaction with polyisocyanates in the preparation of synthetic resins by the isocyanate-polyaddition process.
Abstract:
The invention relates to the use of 2,4-dioxo-1,2-dihydro-4Hbenzoxazine as well as derivatives therefrom as blowing agents for the production of cellular and porous articles. These compounds do not liberate any corrosive, discolorizing, malodorous or toxic decomposition products.