Modified polymeric aromatic isocyanates having allophanate linka

Details Modified polymeric aromatic isocyanates having allophanate linka Modified polymeric aromatic isocyanates having allophanate linka

1996-11-07

1999-05-11

Gorr, Rachel

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523143, 525395, 525399, 528 49, 528 59, 164 6, 164 47, B22C1/22

Patent

active

059028408

ABSTRACT:
The invention relates to modified polymeric aromatic isocyanates having allophanate linkages prepared by (a) reacting a polymeric aromatic isocyanate with a monofunctional aliphatic alcohol to form an intermediate modified polymeric isocyanate; and (b) reacting the intermediate modified polymeric isocyanate at an elevated temperature in the presence of a divalent metal catalyst. The invention also relates to foundry binder systems which use these modified polyisocyanates. These modified polyisocyanates, along with a phenolic resole resin, are added to a foundry aggregate to form a foundry mix which is shaped and cured with a gaseous amine curing catalyst by the cold-box process.

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