Patent ID: 6951710

Claim:
A composition being free from an alkanol amine wherein the composition comprises a) about 25-75% by weight of at least one amine represented by the formula: NR 1 R 2 R 3 wherein each of R 1 , R 2 and R 3 individually is selected from the group consisting of H, aliphatic group, ether group, amino group and aryl group, and an N heterocyclic group optionally containing at least one additional hetero atom selected from the group consisting of N, O and S in the ring; or at least one quaternary ammonium compound represented by the formula [NR 4 R 5 R 6 R 7 ] − OH wherein each of R 4 , R 5 , R 6 and R 7 individually is an alkyl group; b) about 10 to about 25% by weight of hydroxylamine; c) about 0 to about 32% by weight of an organic diluent; d) about 10 to about 30% by weight of water; e) about 1 to about 25% by weight of a corrosion inhibitor; and having a pH of greater than 7.