Novel process for trimerizing polyisocyanates

Details Novel process for trimerizing polyisocyanates Novel process for trimerizing polyisocyanates

1975-05-19

1977-01-18

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

252431C, 260 25AW, B01J 3112, C08G 1818, C08G 1824

Patent

active

040038599

ABSTRACT:
A novel catalyst combination for the trimerization of polyisocyanates to polyisocyanurates is disclosed. The catalyst combination comprises (i) a tertiary amine trimerization catalyst, (ii) an alkali metal salt of an N-substituted amide, and (iii) a dibutyl tin di(alkanoate) compound. The use of this catalyst combination in the preparation of polyisocyanurate spray foams enables the systems to be sprayed in either a 1:1 or 2:1 by volume ratio, or ratios between these limits interchangably with no alterations being required in reactant formulations. The polyisocyanurate foams produced using the novel catalyst combination of the invention are characterized by having high resistance to flame and heat distortion.

REFERENCES:
patent: 3075928 (1963-01-01), Lanham
patent: 3203932 (1965-08-01), Frisch et al.
patent: 3342757 (1967-09-01), Considine et al.
patent: 3516973 (1970-06-01), Kato et al.
patent: 3732176 (1973-05-01), Hostettler et al.

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