Flame retardant compositions with low formaldehyde content
AssigneeEnergy Solutions (US) LLC
InventorsGeoffrey Hand, John Davis, Gary Woodward
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Abstract
The instant invention relates to a composition useful as a precursor for imparting flame-retardant properties to textile articles, comprising a condensate of: (a) a tetrakis (hydroxyorgano) phosphonium sulfate THPS; (b) urea, or alternatively thiourea; (c) optionally, and preferably, an aliphatic hydroxyl-reactive compound, such an amine wherein said composition has a very low free formaldehyde content, namely of less than 0.1%.
Claims14
A polymer precursor composition comprising a condensate of compounds comprising:
- (a) a tetrakis (hydroxyorgano) phosphonium sulfate in water having a pH in a range from 5.0 to 5.7;
- (b) urea or thiourea;
- and
- (c) an aliphatic hydroxyl-reactive compound having from 12 to 18 carbon atoms,
- wherein the molar ratio of (a)/((b)+(c)) is in a range from 1.5:1 to 4:1, and wherein said polymer precursor composition has a free formaldehyde content of less than 0.1% by weight, based on the total weight of the composition;
- and wherein the condensate is produced at a reaction temperature of less than 100° C.
A process of preparing a polymer precursor composition having a free formaldehyde content of less than 0.1% by weight, based on the total weight of the composition form a condensate of:
- a. a tetrakis (hydroxyorgano) phosphonium sulfate;
- and
- b. a urea or thiourea;
- c. an aliphatic hydroxyl-reactive compound having from 12 to 18 carbon atoms, said process comprising the following successive steps:
- (2.1.) placing the compound (a) in water and adjusting the pH to a range from 5.0 to 5.7;
- (2.2) mixing the compound (c) and the mixture obtained in said step (2.1);
- (2.3) allowing the mixture obtained in said step (2.2) to react at a temperature lower than 90° C. to 115° C.;
- (2.4) mixing the compound (b) and the reaction product obtained in said step (2.3);
- (2.5) allowing the mixture obtained in said step (2.4) to react at a temperature of less than 100° C., and for a period of time from 0.5 hour to 4 hours,
- wherein the molar ratio of (a)/((b)+(c)) is in a range of 1.5:1 to 4:1.
Dependencies are inferred from the claim text.