Toluene diisocyanate residue-based compositions having reduced acid values
AssigneeBayer Aktiengesellschaft
InventorsWilliam E. Slack, Scott A. Kane, James W. Rosthauser
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Abstract
TDI residue-based urethane-filled isocyanate compositions are produced by reacting a TDI residue satisfying specified criteria with a monofunctional alcohol in amounts such that the equivalent ratio of isocyanate groups to hydroxyl groups is from about 0.9:1 to about 1:0.9. This reaction product is then dissolved in a diisocyanate or polyisocyanate before, during or after reaction of that product with an epoxide having an epoxide equivalent weight of from about 44 to about 400 at a temperature of up to 120.degree. C. These TDI residue-based urethane-filled isocyanate compositions are particularly useful in the production of polyurethanes.
Claims20
A process for the production of a urethane-filled, diisocyanate or polyisocyanate having a reduced acid value comprising
- a) reacting
- 1) a toluene diisocyanate residue from the phosgenation of toluene diamine having an ortho-toluenediamine content of less than 0.5% which toluene diisocyanate residue contains at least 10% by weight monomeric toluene diisocyanate and has a total isocyanate group content of at least 20% with
- 2) a monofunctional alcohol in amounts such that the equivalent ratio of isocyanate groups in 1) to hydroxyl groups in 2) is from about 0.9:1.0 to about 1.0:0.9,
- b) dissolving the product of a) in a diisocyanate or polyisocyanate, and
- c) reacting from 0.5 to 20% by weight, based on the weight of a), of an epoxide having an epoxide equivalent weight of from about 44 to about 400 with the product of either a) or b) at a temperature of up to 120.degree. C.
Dependencies are inferred from the claim text.