Thermosetting coatings based on ketoxime-blocked isocyanates and oxazolidines
AssigneeRohm and Haas Company
InventorRaymond F. Jenkins
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Abstract
Low temperature, one-component thermosetting coating compositions comprising a ketoxime-blocked polyisocyanate and an oxazolidine are disclosed. Also disclosed are a process for curing such composition and the cured products.
Claims18
A low temperature curing, one-component thermosetting coating composition comprising an oxime-blocked polyisocyanate and an oxazolidine, said oxazolidine being hydrolyzable by moisture at a temperature of between about 125.degree. F. and 325.degree. F. the hydrolysis product of which can react with a polyisocyanate, to produce a polymeric product.
A process for forming a polymeric material which comprises contacting with water a composition comprising a ketoxime-blocked polyisocyanate and an oxazolidine having at least one substitutent of the formula:
- ##STR26## wherein R.sup.1 is a hydrogen atom, a phenyl group, benzyl group, or a (C.sub.1 -C.sub.12) alkyl group, and
- R.sup.2 is a hydrogen atom or a (C.sub.1 -C.sub.4) group, or R.sup.1 and R.sup.2 are taken together with the attached carbon atom to form a saturated five- or six-membered saturated carbon ring, and
- Y is the radical ##STR27## wherein n is 2 or 3, and R.sup.3 and R.sup.4 are, individually, hydrogen atoms, (C.sub.1 -C.sub.12) alkyl groups, (C.sub.6 -C.sub.10) aryl groups, or (C.sub.7 -C.sub.12) aralkyl or alkaryl groups, and heating the composition, in the presence of said water, to a temperature at which the isocyanate is unblocked and said polymeric material is formed.
Dependencies are inferred from the claim text.