Process for the production of amino silicate compounds and their condensation products

Claim 2

The process for the production of poly(aldehyde amino silicate) resinous condensation products by the following steps: (a) mixing about 10 parts by weight of silicic acid, weight calculated on the basic of dried silicic acid, and from about 5 to 20 parts by weight of an amino compound; (b) heating said mixture to a temperature of from about 70° C to above the melting point, but below the boiling point of the amino compound for at least 20 minutes; whereby an amino silicate compound is formed: (c) adding an aldehyde to said mixture in the ratio of 1 to 5 mols to each mol of said amino silicate, heating said mixture to a temperature of from about 70° to 150° C., while agitating, for at least about 20 minutes, whereby a poly(aldehyde amino silicate) resin is produced.

Claim 3

The method according to claim 1 wherein said amino compound is selected from the group consisting of urea, thiourea, melamine, dicyandiamide, and mixtures thereof.

Claim 4

The method according to claim 1 wherein said aldehyde is selected from the group consisting of formaldehyde and an aqueous solution of formaldehyde.

Claim 5

The process for the production of silicic amino resinous condensation compounds by the following steps: (a) silicic acid selected from the group consisting of moist silicic acid gel, dry silicic acid gel, orthosilicic acid, metasilicic acid and mixtures thereof, an amino compound selected from the group consisting of urea, thiourea, melamine, dicyandiamide and mixtures thereof, an aldehyde selected from the group consisting of formaldehyde and an aqueous solution of formed dehyde, are mixed in a ratio of equal mols, the mols of silicic acid being calculated on the silicon dioxide content; then (b) the pH is adjusted to a pH of 8 to 10.5 with an alkali catayst selected from the group consisting of sodium carbonate, sodium hydroxide, potassium carbonate, sodium silicate, calcium hydroxide, ammonia, alkanolamine and mixtures thereof; and (c) the mixture is agitated and heated to 60° to 100° C for 20 to 120 minutes, thereby (d) producing silicic amino resinous condensation products.

Claim 6

The process for the production of silicic amino resinous condensation compounds by the following steps: (a) silicic acid selected from the group consisting of moist silicic acid gel, dry silicic acid gel, orthosilicic acid, metasilicic acid and mixtures thereof, an amino compound selected from the group consisting of urea, thiourea, melamine, dicyandiamide and mixtures thereof, an aldehyde selected from the group consisting of formaldehyde and an aqueous solution of formed dehyde, are mixed in a ratio of equal mols, the mols of silicic acid being calculated on the silicon dioxide content; then (b) the pH is adjusted to a pH of 8 to 10.5 with an alkali catayst selected from the group consisting of sodium carbonate, sodium hydroxide, potassium carbonate, sodium silicate, calcium hydroxide, ammonia, alkanolamine and mixtures thereof; and (c) the mixture is agitated and heated to 60° to 100° C for 20 to 120 minutes, thereby (d) producing silicic amino resinous condensation products.

Claim 7

The method of claim 4 wherein step (c) the pH is adjusted to 4 to 6, with an acid catalyst selected from the group consisting of sodium hydrogen sulfate, sulfuric acid, hydrochloric acid, formic acid, acetic acid, acid alkyl phosphates and mixtures thereof, in place of using an alkali catalyst.

Claim 8

The method of claim 1, wherein an alkali compound, selected from the group consisting of sodium carbonate, sodium hydroxide, potassium carbonate, sodium silicate and mixtures thereof, is added until the pH of 8 to 10 is obtained in step (a).

Claim 9

The method of claim 1 wherein the silicic acid is selected from the group consisting of silicic acid gel, orthosilicic acid, metasilicic acid and mixtures thereof.

Claim 10

The method of claim 1 wherein in step (c) the pH is adjusted to 4 to 6 with an acid catalyst, selected from the group consisting of sodium hydrogen sulfate, sulfuric acid, hydrochloric acid, formic acid, acetic acid, acid alkyl phosphates and mixtures thereof.

Claim 11

The method of claim 1 wherein the amino compound is urea.

Claim 12

The method of claim 1 wherein the aldehyde compound is formaldehyde.

Claim 13

The method of claim 1 wherein the silicic acid is silicic acid gel.

Claim 14

The method of claim 1 wherein silicic acid is reacted with an amino compound in the ratio of 2 to 1 mols; the mols of silicic acid are calculated by using the silicon dioxide content, thereby producing an amino disilicate compound in step (a).