Process for preparing a urethane coating comprising freezing a premix of an isocyanate and a polyol in a solvent
AssigneeHughes Aircraft Company
InventorsEdward A. Anderson, Ivars Miculs, Koji Tomikawa
Life of this patent
Estimating the term…
Abstract
A frozen urethane premix coating material is prepared by mixing together an isocyanate, a hydroxy terminated aliphatic polyol, and an organic solvent in an amount of at least 75 percent by weight of the total weight of the premix, and then freezing the mixture. The storage life of the mixture is several months, after which it is thawed and used as a coating material. In one form, the premix includes 4,4'-diphenyl methane diisocyanate as the isocyanate and a mixture of toluene and methyl ethyl ketone as the solvent.
Claims12
A process for preparing a urethane coating material, comprising the steps of:
- mixing together an isocyanate, a hydroxy terminated aliphatic polyol, and an organic solvent to form a premix, the premix having a freezing point of less than about 0.degree. C., the solvent being present in an amount of at least about 75 weight percent of the total weight of the mixture;
- and
- freezing the premix.
A process for preparing a urethane coating material, comprising the steps of:
- mixing together an isocyanate, a hydroxy terminated aliphatic polyol, and an organic solvent to form a premix, the solvent being present in an amount of at least about 75 weight percent of the total weight of the mixture;
- and
- freezing the premix at a temperature of about -40.degree. C.
A process for preparing a urethane coating material, comprising the steps of:
- mixing together three components to form a premix,
- the first component consisting essentially of at least 90 percent by weight of 4,4'-diphenylmethane diisocyanate and higher molecular weight polymers and no more than 10 percent by weight of toluene,
- the second component consisting essentially of at least 80 percent by weight of hydroxy terminated aliphatic polyols, no more than 10 percent by weight toluene, and no more than 10 percent by weight of methylethyl ketone,
- the third component consisting essentially of about 50 percent by weight of toluene and 50 percent by weight of ethylene glycol monoethyl ether acetate,
- the first component being present in an amount of about 18 parts by weight, the second component being present in an amount of about 100 parts by weight, and the third component being present in an amount of at least about 354 parts by weight;
- and
- freezing the premix at a temperature of about -40.degree. C.
Dependencies are inferred from the claim text.