Catalyst system for flame retardant finishing
AssigneeStauffer Chemical Company
InventorHarold McDonald
Life of this patent
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Abstract
A catalyst system comprised of copper sulfate and hydrogen peroxide is utilized to cure unsaturated flame retardants on textiles. The resultant flame retarded textiles have unusually good hand (softness); even with high add-on (weight percent of chemicals applied to a textile) of the flame retardants. Conventional techniques and equipment can be used with the system of the present invention.
Claims20
A composition for flame retarding textiles comprising an unsaturated flame retardant, copper sulfate and hydrogen peroxide wherein said unsaturated flame retardant comprises at least one copolycondensed oligomeric vinylphosphonate consisting essentially of the product resulting from the reaction, in stoichiometric ratio of from about 1:10 to 10:1, between a bis (2-haloalkyl) vinylphosphonate and at least one pentavalent phosphorus ester of the structure ROP(.dbd.O)XY where R is selected from the class consisting of C.sub.1 --C.sub.20 alkyl and C.sub.1 --C.sub.20 chloro- or bromoalkyl groups and X and Y are groups selected from the class consisting of RO--, C.sub.1 --C.sub.20 alkyl, C.sub.2 --C.sub.20 alkenyl, phenyl, phenoxy, amino, C.sub.1 --C.sub.20 alkyl substituted amino, phenyl substituted amino, C.sub.2 --C.sub.20 alkylene bonded to the same or to another ROP(.dbd.O) moiety and C.sub.2 --C.sub.20 alkyleneoxy and C.sub.2 --C.sub.20 alkylenedioxy bonded to the same or to another ROP(.dbd.O) moiety, wherein said reaction is carried out at an elevated temperature for a period of time sufficient to evolve R-halide as a by-product and to form a P(O)-O-alkylene-O-P(O) linkage, with the proviso that said product is not the homo-condensed product of bis (2-haloalkyl) vinylphosphonate;
- the weight ratio of said unsaturated flame retardant to the combined weight of copper sulfate and hydrogen peroxide is from about 2:1 to about 20:1 and the weight ratio of copper sulfate to hydrogen peroxide is from about 1:1 to about 1:210.
A method of flame retarding a textile comprising treating said textile with a flame retardant amount of an unsaturated flame retardant and curing said unsaturated flame retardant with a catalytic amount of a composition comprising copper sulfate and hydrogen peroxide wherein said unsaturated flame retardant comprises at least one copolycondensed oligomeric vinylphosphonate consisting essentially of the product resulting from the reaction, in stoichiometric ratio of from about 1:10 to 10:1, between a bis (2-haloalkyl) vinylphosphonate and at least one pentavalent phosphorus ester of the structure ROP(.dbd.O)XY where R is selected from the class consisting of C.sub.1 --C.sub.20 alkyl and C.sub.1 --C.sub.20 chloro- or bromoalkyl groups and X and Y are groups selected from the class consisting of RO--, C.sub.1 --C.sub.20 alkyl, C.sub.2 --C.sub.20 alkenyl, phenyl, phenoxy, amino, C.sub.1 --C.sub.20 alkyl substituted amino, phenyl substituted amino, C.sub.2 --C.sub.20 alkylene bonded to the same or to another ROP(.dbd.O) moiety and C.sub.2 --C.sub.20 alkyleneoxy and C.sub.2 --C.sub.20 alkylenedioxy bonded to the same or to another ROP(.dbd.O) moiety, wherein said reaction is carried out at an elevated temperature for a period of time sufficient to evolve R-halide as a by-product and to form a P(O)-O-alkylene-O-P(O) linkage, with the proviso that said product is not the homo- condensed product of said bis (2-haloalkyl) vinylphosphonate and the weight ratio of copper sulfate to hydrogen peroxide is from about 1:1 to about 1:210.
Dependencies are inferred from the claim text.