Ammonium styrenesulfonate composition excellent in storage stability, and method for producing same

2:

• The ammonium styrenesulfonate composition according to claim 1, wherein
• (1) the ammonium styrenesulfonate composition has an ammonium styrenesulfonate content of 88.0% by weight or more;
• (2) the ammonium styrenesulfonate composition has a water content of 0.10% by weight to 10.00% by weight;
• (3) the ammonium styrenesulfonate composition has an alkali metal content of 0.50% by weight or less;
• (4) the ammonium styrenesulfonate composition has a halogen content of 1.00% by weight or less;
• (5) the ammonium styrenesulfonate composition has a polymer content of 0.20% by weight or less;
• and
• (6) the ammonium styrenesulfonate composition has a polymerization inhibitor content of ppm to 2000 ppm.

3:

• The ammonium styrenesulfonate composition according to claim 1, wherein
• (1) the ammonium styrenesulfonate composition has an ammonium styrenesulfonate content of 94.00% by weight or more;
• (2) the ammonium styrenesulfonate composition has a water content of 0.10% by weight to 6.00% by weight;
• (3) the ammonium styrenesulfonate composition has an alkali metal content of 0.50% by weight or less;
• (4) the ammonium styrenesulfonate composition has a halogen content of 0.10% by weight or less;
• (5) the ammonium styrenesulfonate composition has a polymer content of 0.20% by weight or less;
• and
• (6) the ammonium styrenesulfonate composition has a polymerization inhibitor content of ppm to 1000 ppm.

12:

• A method for producing the ammonium styrenesulfonate composition according to claim 1, the method comprising bringing sodium or potassium styrenesulfonate into contact with an inorganic ammonium salt in water in the presence of a polymerization inhibitor in an amount of 7 mol % or less with respect to the amount of sodium or potassium styrenesulfonate to cause a cation exchange reaction, and then cooling to precipitate crystals of ammonium styrenesulfonate, and separating the crystals by filtration,
• wherein
• the charging ratio of ammonium cations to alkali metal styrenesulfonate is 1.50 equivalents to 3.00 equivalents, and
• the total solids content in the reaction system is from 25.00% by weight to 50.00% by weight,
• a temperature at which sodium or potassium styrenesulfonate is brought into contact with an inorganic ammonium salt is 30° C. to 80° C., and
• a temperature at which precipitated crystals are separated by filtration is 5° C. to 30° C.

13:

• The method for producing the ammonium styrenesulfonate composition according to claim 12,
• the method comprising bringing sodium or potassium styrenesulfonate into contact with an inorganic ammonium salt in water in the presence of a polymerization inhibitor in an amount of 7 mol % or less with respect to the amount of sodium or potassium styrenesulfonate to cause a cation exchange reaction, and then cooling to precipitate crystals of ammonium styrenesulfonate, and separating the crystals by filtration,
• wherein
• the charging ratio of ammonium cations to alkali metal styrenesulfonate is 1.50 equivalents to 3.00 equivalents, and
• the total solids content in the reaction system is from 25.00% by weight to 45.00% by weight,
• a temperature at which sodium or potassium styrenesulfonate is brought into contact with an inorganic ammonium salt is 30° C. to 80° C., and
• a temperature at which precipitated crystals are separated by filtration is 5° C. to 30° C.

14:

• The method for producing the ammonium styrenesulfonate composition according to claim 12,
• the method comprising bringing sodium or potassium styrenesulfonate into contact with an inorganic ammonium salt in water in the presence of a polymerization inhibitor in an amount of 5 mol % or less with respect to the amount of sodium or potassium styrenesulfonate to cause a cation exchange reaction, and then cooling to precipitate crystals of ammonium styrenesulfonate, and separating the crystals by filtration,
• wherein
• the charging ratio of ammonium cations to alkali metal styrenesulfonate is 2.00 equivalents to 2.50 equivalents, and
• the total solids content in the reaction system is from 35.00% by weight to 45.00% by weight,
• a temperature at which sodium or potassium styrenesulfonate is brought into contact with an inorganic ammonium salt is 40° C. to 60° C., and
• a temperature at which precipitated crystals are separated by filtration is 15° C. to 25° C.

17:

• An ammonium styrenesulfonate composition, wherein the ammonium styrenesulfonate composition is obtained by a method comprising bringing sodium or potassium styrenesulfonate into contact with an inorganic ammonium salt in water in the presence of a polymerization inhibitor in an amount of 7 mol % or less with respect to the amount of sodium or potassium styrenesulfonate to cause a cation exchange reaction, and then cooling to precipitate crystals of ammonium styrenesulfonate, and separating the crystals by filtration,
• wherein
• the charging ratio of ammonium cations to alkali metal styrenesulfonate is 1.50 equivalents to 3.00 equivalents, and
• the total solids content in the reaction system is from 25.00% by weight to 50.00% by weight,
• a temperature at which sodium or potassium styrenesulfonate is brought into contact with an inorganic ammonium salt is 30° C. to 80° C., and
• a temperature at which precipitated crystals are separated by filtration is 5° C. to 30° C.