Process for producing modified organic polyisocyanate
AssigneeNippon Polyurethane Industry Co., Ltd.
InventorKiyoshi Moriya
Life of this patent
Estimating the term…
Abstract
A modified organic polyisocyanate is prepared in such a manner that a trimerization catalyst, an organic phosphite estr, and a surfactant, and optionally a ferrocene compound are added to an organic isocyanate and/or a partially urethanized organic polyisocyanate to cause isocyanuration in an extent that not more than 20% by weight of entire isocyanate groups are isocyanurated; and a stopper is added, if necessary.
Claims93
A modified organic polyisocyanate which contains an isocyanurate ring, produced from the reaction of an original polyisocyanate selected from the group consisting of organic polyisocyanates, partially urethanized organic polyisocyanates, and mixtures thereof, in a reaction mixture comprising a trimerization catalyst, an organic phosphite ester, and a surfactant, to cause isocyanuration of not more than about 20% by weight of the isocyanate groups in the original polyisocyanate.
The modified polyisocyanate of claim 16 wherein the diol is selected from the group consisting of ethylene glycol, diethylene glycol, 1,3-butanediol, 1,4-butanediol, propylene glycol, dipropylene glycol, neopentyl glycol, 1,6-hexane glycol, 2-ethylhexanediol, 2,2,4-trimethylpentanediol, polyester diols, and polyether diols.
A process for producing a polyisocyanurate foam by the foaming reaction of a resin composition comprising a polyol having a molecular weight of not less than about 200, a blowing agent, a catalyst, a foam stabilizer, and a modified polyisocyanate containing an isocyanurate ring, wherein the modified polyisocyanate is produced from the reaction of an original polyisocyanate selected from the group consisting of organic polyisocyanates, partially urethanized organic polyisocyanates, and mixtures thereof, in a reaction mixture comprising a trimerization catalyst, an organic phosphite ester, and a surfactant, to cause isocyanuration of not more than about 20% by weight of the isocyanate groups in the original polyisocyanate, wherein the constituents of the resin composition are mixed homogeneously before foaming.
Dependencies are inferred from the claim text.