Patent ID: 9725643
Date: 2017-08-08
CPC Classifications: C09K

Claim:
1. Foam containing water, between 5 and 30 wt % on total weight of the foam of a chelating agent selected from the group of glutamic acid N,N-diacetic acid or a salt thereof (GLDA), aspartic acid N,N-diacetic acid or a salt thereof (ASDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA), N-hydroxyethyl ethylenediamine-N,N′,N′-triacetic acid or a salt thereof (HEDTA), a foaming agent, and at least 25 vol % on total volume of the foam of a gas and having a pH of between 2 and 5 wherein the amount of foaming agent is between 10 ppm and 200,000 ppm on total foam weight.