Polyester resin powder coating compositions
AssigneeTioxide Specialties Limited
InventorJohn Ridland
Life of this patent
Estimating the term…
Abstract
A method of curing a powder coating composition comprises reacting a polyester resin with an alkanolamine derivative of titanium or zirconium. This derivative is the reaction product of an orthoester or a condensed orthoester of titanium or zirconium with a trialkanolamine and with a dialkanolamine or a monoalkanolamine. In the reaction product the ratio of trialkanolamino radicals to Ti or Zr atoms is from 0.5:1 to 1.5:1 and the ratio of monoalkanolamino radicals or dialkanolamino radicals to Ti or Zr atoms is from 0.2:1 to 2.0:1. The reaction products are preferably derivatives of ethanolamines or isopropanolamines and can be used to cure carboxyl-rich resins or hydroxyl-rich resins.
Claims23
A method of curing a powder coating composition comprising heating a polyester resin with an alkanolamine derivative of a metal selected from the group consisting of titanium and zirconium to a sufficiently high temperature to cause said alkanolamine derivative of a metal to react with and cross-link said polyester resin, said alkanolamine derivative of a metal being the reaction product of an organometallic compound selected from orthoesters and condensed orthoesters of said metal with a first alkanolamine which is a trialkanolamine and with a second alkanolamine selected from the group consisting of dialkanolamines having the formula HN(ROH).sub.2 and monoalkanolamines having the formula H.sub.2 NROH where, in each formula, R represents a divalent radical, said reaction product containing trialkanolamino radicals derived from said first alkanolamine and alkanolamino radicals derived from said second alkanolamine and said reaction product having a ratio of trialkanolamino radicals to atoms of said metal in the range 0.5:1 to 1.5:1 and a ratio of alkanolamino radicals to atoms of said metal in the range 0.2:1 to 2.0:1.
A composition suitable for use as a powder coating comprising a mixture of a polyester resin with an alkanolamine derivative of a metal selected from the group consisting of titanium and zirconium, said alkanolamine derivative of a metal being the reaction product of an organometallic compound selected from orthoesters and condensed orthoesters of said metal with a first alkanolamine which is a trialkanolamine and with a second alkanolamine selected from the group consisting of dialkanolamines having the formula HN(ROH).sub.2 and monoalkanolamines having the formula H.sub.2 NROH where, in each formula, R represents a divalent radical, said reaction product containing trialkanolamino radicals derived from said first alkanolamine and alkanolamino radicals derived from said second alkanolamine and said reaction product having a ratio of trialkanolamino radicals to atoms of said metal in the range 0.5:1 to 1.5:1 and a ratio of alkanolamino radicals to atoms of said metal in the range 0.2:1 to 2.0:1.
Dependencies are inferred from the claim text.