Loading patent…
AssigneeTexaco Chemical Company
InventorsGeorge P. Speranza, Jiang-Jen Lin, Michael Cuscurida
Estimating the term…
A polyurethane coating composition is disclosed which may be heat cured under relatively mild conditions. The composition comprises a chemically blocked isocyanate and a curing agent comprising an N,N'-dialkyl substituted polyoxyalkylene amine.
A heat curable polyurethane coating comprising a blocked isocyanate and a curing agent comprising an N,N'-dialkyl substituted polyoxyalkylene amine having 50 to 100% of its amine groups substituted to secondary amines.
A method for curing a blocked isocyanate which comprises mixing the blocked isocyanate with a curing agent comprising an N,N-dialkyl substituted polyoxyalkylene amine having 50 to 100% of its amine groups substituted to secondary amines.
A method for curing a blocked isocyanate which comprises mixing a blocked isocyanate with an N,N-dialkyl substituted polyoxyalkylene amine of about 200 to 400 molecular with a functionality of about 2 to 3 having 50 to 100% of its amine groups substituted to secondary amines.
A method for curing a blocked isocyanate which comprises mixing a blocked isocyanate with an N,N-dialkyl substituted polyoxyalkylene amine of the general formula:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
Masked polyisocyanates: masked with compounds having only one group containing active hydrogen
Polyamines: acyclic
Having nitrogen: containing primary and/or secondary amino groups
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
Term ended 21 Dec 2007 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to the use of certain amines for curing blocked polyisocyanates especially in a coating composition.
2. Related Art in the Field
This example will illustrate the hydrogenation of a triethylene glycol diamine (.sup.1) (JEFFAMINE.RTM. EDR-148)/acetone mixture to form the N,N'-dialkyl substituted derivative (.sup.2).
To a 1-liter stirred autoclave was charged EDR-148 (296g, 2 moles), acetone (174g, 3 moles) and a nickel, copper, chromium catalyst such as defined in U.S. Pat. No. 3,654,370 (25g). The autoclave was sealed and flushed twice with hydrogen. The reactor was pressured to 1000 psi of hydrogen and heated to 180.degree. C. Then, the pressure was raised to 2500 psi and maintained at this pressure with incremental addition of hydrogen until no pressure uptake was noticed. The reaction time was about 5 hrs. The mixture was allowed to cool to room temperature. The Ni, Cu, Cr catalyst was recovered through filtration. The filtrate was distilled to give N-isopropyl triethylene glycol diamine (.sup.1) (.about.90% purity, b.p. 120.degree.-129.degree. C./12 mm Hg, 200g) and N,N'-diisopropyl triethylene glycol diamine, (.sup.2) (b.p. 134.degree.-140.degree. C./11 mm Hg, 66.2g) ##STR4##
This example will show the hydrogenation of a tetraethylene glycol diamine (JEFFAMINE EDR-192)/acetone mixture to form the corresponding N,N'-dialkyl substituted derivative.