Method for the preparation of a composition containing polycarbamoyl sulphonates from polyisocyanates

Claim 1

A method for the preparation of a composition containing polycarbamoyl sulphonates from polyisocyanates which comprises the following steps in the stated order: Step 1: Mixing a polyisocyanate with (a) an aqueous solution of an alkali metal or ammonium bisulphite or metabisulphite, or an aqueous solution of a mixture of any two or more of these salts; (b) one or more tertiary amines containing on average per molecule one or more tertiary amino groups of the type R 1 R 2 R 3 N where R 1 , R 2 and R 3 are each alkyl, aryl, or cycloalkyl groups or two or more of the groups R 1 , R 2 and R 3 together form alicyclic or aromatic rings; and (c) at least one water-miscible solvent selected from the group consisting of: lower aliphatic alcohols with from one to six carbon atoms, ethylene glycol, propylene glycol, diethylene glycol, the mono and di ethers of the said glycols with lower aliphatic alcohols with from one to six carbon atoms, dioxan, tetrahydro furan and tetrahydrofuryl alcohol; and Step 2 Mixing the reaction mixture from Step 1 with at at least one mineral acid or solution thereof; wherein the polyisocyanate is prepared by the reaction of (d) a compound or mixture of compounds containing on average two or more isocyanate groups per molecule, and (e) a compound or mixture of compounds with two or more groups selected from one or more of the groups: hydroxyl, thiol, primary amino, secondary amino or carboxylic acid; and wherein for each mole of isocyanate groups of the polyisocyanate there is at least one mole of bisulphite ion or its equivalent; and wherein the number of moles of tertiary amino groups in component (b) is not greater than the number of moles in (a) of bisulphite ions or their equivalents.

Claim 2

A method for the preparation of a composition containing polycarbamoyl sulphonates from polyisocyanates which comprises the following steps in the stated order: Step 1: Mixing a polyisocyanate with (a) an aqueous solution of an alkali metal or ammonium bisulphite or metabisulphite, or an aqueous solution of a mixture of any two or more of these salts; (b) one or more tertiary amines containing on average per molecule one or more tertiary amino groups of the type R 1 R 2 R 3 N where R 1 , R 2 and R 3 are each alkyl, aryl, or cycloalkyl groups or two or more of the groups R 1 , R 2 and R 3 together form alicyclic or aromatic rings; and (c) at least one water-miscible solvent selected from the group consisting of: lower aliphatic alcohols with from one to six carbon atoms, ethylene glycol, propylene glycol, diethylene glycol, the mono and di ethers of the said glycols with lower aliphatic alcohols with from one to six carbon atoms, dioxan, tetrahydro furan and tetrahydrofuryl alcohol; and Step 2 Mixing the reaction mixture from Step 1 with at at least one mineral acid or solution thereof; wherein the polyisocyanate is prepared by the reaction of (d) a compound or mixture of compounds containing on average two or more isocyanate groups per molecule, and (e) a compound or mixture of compounds with two or more groups selected from one or more of the groups: hydroxyl, thiol, primary amino, secondary amino or carboxylic acid; and wherein for each mole of isocyanate groups of the polyisocyanate there is at least one mole of bisulphite ion or its equivalent; and wherein the number of moles of tertiary amino groups in component (b) is not greater than the number of moles in (a) of bisulphite ions or their equivalents.