Polyurethane foams and processes for preparation
AssigneesPatrick James Crehan, Richard J. Fricke
InventorRichard B. Kennedy
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Abstract
Polyurethane foams which may be rendered flame resistant by the addition of flame retardants are produced by reaction between a carbohydrate, a polyisocyanate and water in the presence of a suitable surfactant and polyurethane forming catalyst.
Claims39
A low reactive pressure flame-retardant polyurethane foam made by reacting together a reaction mixture consisting essentially of polyisocyanate, a surfactant, a polyurethane producing catalyst, and an aqueous solution or slurry of an untreated carbohydrate in which substantially all of the hydroxyl groups are free, and a flame retardant.
A method of making a flame-retardant polyurethane foam consisting essentially of:
- a. mixing an untreated carbohydrate in which substantially all of the hydroxyl groups are free, a surfactant, a polyurethane forming catalyst, and water to form an aqueous solution or slurry,
- b. adding to the aqueous solution or slurry mixture a polyisocyanate and a flame retardant selected from the group consisting of sodium chloride, calcium chloride, alkali metal borates, tri-cresyl phosphate, tri(2-chloroethyl)phosphate, tris-(chloropropyl)-phosphonate, O,O-diethyl-N,N-bis-(2-hydroxyethyl) aminoethyl phosphate, antimony oxide, alumina, and antimony oxychloride;
- and
- c. allowing the mixture to foam.
A polyurethane foam made by reacting together a reaction mixture consisting essentially of polyisocyanate, a surfactant, a polyurethane forming catalyst and and aqueous solution or slurry of an untreated carbohydrate in which substantially all of the hydroxyl groups are free.
A method for making a polyurethane foam consisting essentially of:
- a. a mixing an untreated carbohydrate in which substantially all of the hydroxyl groups are free and a polyurethane forming catalyst to form an aqueous solution or slurry,
- b. mixing resulting aqueous solution or slurry with mixture containing a polyisocyanate, and a surfactant;
- and
- c. allowing the mixture to foam.
A low reactive pressure flame-retardant polyurethane foam made by reacting together a reaction mixture free of industrial polyol and containing a polyisocyanate, a surfactant, a polyurethane producing catalyst and an aqueous solution or slurry of an untreated carbohydrate in which substantially all of the hydroxyl groups are free, and a flame retardant.
A polyurethane foam made by reacting together a reaction mixture free of industrial polyol and containing a polyisocyanate, a surfactant, a polyurethane producing catalyst and an aqueous solution or slurry of an untreated carbohydrate in which substantially all of the hydroxyl groups are free, and a flame retardant.
Dependencies are inferred from the claim text.