Purification of condensation products
AssigneeE. I. Du Pont de Nemours and Company
InventorLuann R. Marshall
Life of this patent
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Abstract
Process for removing color-formers from polymeric sulfonated phenol-formaldehyde condensation products so as provide condensation products having reduced tendencies to turn yellow and which provide stain-resistance to polyamide textile substrates which comprises dissolving a polymeric sulfonated phenolformaldehyde condensation product in a aqueous base, acidifying the resulting aqueous solution so as to form a slurry, heating the slurry so as to form a two-phase system comprising an aqueous solution and a water-soluble taffy-like material, separating the aqueous solution and the water-insoluble material from one another, and dissolving the wate-insoluble material in an aqueous base.
Claims20
A process for removing color-formers from polymeric sulfonated phenol-formaldehyde condensation products so as to provide condensation products having reduced tendencies to turn yellow and which will provide stain-resistance to polyamide textile substrates which comprises (a) dissolving a polymeric sulfonated phenol-formaldehyde condensation product in an aqueous base, (b) acidifying the resulting aqueous solution so as to form a slurry, (c) heating the slurry so as to form a system having at least two phases comprising an aqueous solution and a water-insoluble taffy-like material, (d) separating the aqueous solution and the water-insoluble material from one another, and (e) dissolving the water-insoluble material in an aqueous base.
A process for removing color-formers from polymeric sulfonated phenol-formaldehyde condensation products so as to provide condensation products having reduced tendencies to turn yellow and which will provide stain-resistance to polyamide textile substrates which comprises (a) dissolving a polymeric sulfonated phenol-formaldehyde condensation product in water at a pH between about 8.0 and about 12 to give an aqueous solution containing between about 10 and about 40 weight percent of said condensation product, (b) acidifying the resulting aqueous solution to a pH in the range between about 2.0 and 7.5 so as to form a slurry, (c) heating said slurry to a temperature in the range between about 50.degree. and about 65.degree. C. as so to form a system having at least two phases comprising an aqueous solution and a water-insoluble taffy-like material, (d) separating the aqueous solution and water-insoluble taffy-like material from one another, and (e) dissolving the water-insoluble material in water at a pH of at least about 8.0 to give a solution having a concentration of purified sulfonated phenol-formaldehyde condensation product of less than about 50 weight percent.
A process for removing color-formers from polymeric sulfonated phenol-formaldehyde condensation products so as to provide condensation products having reduced tendencies to turn yellow and which will provide stain-resistance to polyamide textile substrates which comprises (a) dissolving a polymeric sulfonated phenol-formaldehyde condensation product in water at a pH between about 9.5 and about 10.0 to give an aqueous solution containing between about 25 and about 30 weight percent of said condensation product, (b) acidifying the resulting aqueous solution to a pH in the range between about 5.5 to about 6.5 so as to form a slurry, (c) heating said slurry to a temperature in the range between about 50.degree. and about 55.degree. C. so as to from a system having at least two phases comprising an aqueous solution and a water-insoluble taffy-like material, (d) separating the aqueous solution and water-insoluble taffy-like material from one another, and (e) dissolving the water-insoluble material in water at a pH between about 8.0 and about 9.5 to give a solution having a concentration of purified sulfonated phenol-formaldehyde condensation product of between about 28 and about 30 weight percent.
Dependencies are inferred from the claim text.