Inorganic particles-containing additive composition, manufacturing method thereof and food composition containing the additive composition

An inorganic particles-containing additive composition containing a polyvalent metal, a phosphoric acid ion, an organic acid having a carboxyl group and an alkali metal, which satisfies the following requirements of (c) and (d):

• (c) 70≦X≦39000
• X:
• Amount (mg/Kg) of the alkali metal contained in a solid content of the inorganic particles-containing additive composition,
• (d) 0.1≦Y≦7
• Y:
• Electric conductivity (mS/cm) when the inorganic particles-containing additive composition is adjusted to a solid concentration of 10% by weight.

An inorganic particles-containing additive composition containing a polyvalent metal, a phosphoric acid ion, an organic acid having a carboxyl group and an alkali metal, which satisfies the following requirements of (e) and (f):

• (e) 150≦X≦10000
• X:
• Amount (mg/Kg) of the alkali metal contained in a solid content of the inorganic particles-containing additive composition,
• (f) 0.25≦Y≦1.8
• Y:
• Electric conductivity (mS/cm) when the inorganic particles-containing additive composition is adjusted to a solid concentration of 10% by weight.

An inorganic particles-containing additive composition containing as a main component at least one of phosphoric acid compounds selected from the group consisting of calcium phosphate, magnesium phosphate and iron phosphate, which comprises a polyvalent metal, a phosphoric acid ion, an organic acid having a carboxyl group and an alkali metal, which is prepared by a method selected from the following (I) to (IV), said additive composition satisfying the following requirements of (a) and (b):

• (I) A precursor is prepared by mixing water, a polyvalent metal compound, an organic acid having a carboxyl group and an alkali metal source, and to the precursor, a phosphoric acid source is added.
• (II) A precursor is prepared by mixing water, a polyvalent metal compound, a phosphoric acid source and an alkali metal source, or, a phosphoric acid source, alkali metal source, and to the precursor, an organic acid having a carboxyl group is added.
• (III) A precursor is prepared by mixing water, a polyvalent metal compound and an organic acid having a carboxyl group, and to the precursor, a phosphoric acid source•alkali metal source is added.
• (IV) A precursor is prepared by mixing water, a polyvalent metal compound, an organic acid having a carboxyl group and a phosphoric acid source, and to the precursor, an alkali metal source is added.
• (a) 70≦X≦90000
• X:
• Amount (mg/Kg) of the alkali metal contained in a solid content of the inorganic particles-containing additive composition,
• (b) 0.1≦Y≦15
• Y:
• Electric conductivity (mS/cm) when the inorganic particles-containing additive composition is adjusted to a solid concentration of 10% by weight.

A method for manufacturing inorganic particles-containing additive composition, comprising the steps of:

• preparing a slurry containing at least one phosphoric acid compound as a main component, which comprises a polyvalent metal, a phosphoric acid ion, an organic acid having a carboxyl group, and an alkali metal, by a method selected from the following (I) to (IV), and
• washing the resultant slurry:
• (I) A precursor is prepared by mixing water, a polyvalent metal compound, an organic acid having a carboxyl group and an alkali metal source, and to the precursor, a phosphoric acid source is added.
• (II) A precursor is prepared by mixing water, a polyvalent metal compound, a phosphoric acid source and a alkali metal source, or, a phosphoric acid source, alkali metal source, and to the precursor, an organic acid having a carboxyl group is added.
• (III) A precursor is prepared by mixing water, a polyvalent metal compound and an organic acid having a carboxyl group, and to the precursor, a phosphoric acid source•alkali metal source is added.
• (IV) A precursor is prepared by mixing water, a polyvalent metal compound, an organic acid having a carboxyl group and a phosphoric acid source, and to the precursor, an alkali metal source is added.