	US 11,788,032 B2
	Hardness additives comprising an aminocarboxylate chelant mixture and block detergents containing this mixture to improve edge hardening
Jesus Cabanas, Saint Paul, MN (US); Gerald Phan, Saint Paul, MN (US); Yoshiyuki Sato, Ota (JP); Tomoko Nakabayashi, Saitama (JP); Masahiro Takaoka, Kawaguchi (JP); John Mansergh, Saint Paul, MN (US); and Carter M. Silvernail, Saint Paul, MN (US)
Assigned to ECOLAB USA INC., Saint Paul, MN (US)
Filed by ECOLAB USA INC., Saint Paul, MN (US)
Filed on Jul. 25, 2022, as Appl. No. 17/814,592.
Application 17/814,592 is a continuation of application No. 16/804,377, filed on Feb. 28, 2020, granted, now 11,421,186.
Claims priority of provisional application 62/811,656, filed on Feb. 28, 2019.
Prior Publication US 2022/0372405 A1, Nov. 24, 2022
Int. Cl. C11D 3/33 (2006.01); C11D 3/37 (2006.01); C11D 1/72 (2006.01); C11D 3/10 (2006.01); C11D 3/386 (2006.01); C11D 17/04 (2006.01)

CPC C11D 3/3761 (2013.01) [C11D 1/72 (2013.01); C11D 3/10 (2013.01); C11D 3/33 (2013.01); C11D 3/386 (2013.01); C11D 17/044 (2013.01)]

17 Claims

1. A hardness additive composition comprising:

from about 5 wt-% to about 40 wt-% of at least one polycarboxylic acid polymer chelant comprising a polyacrylate or polyacrylic acid copolymer or homopolymer; and

from about 60 wt-% to about 95 wt-% of an aminocarboxylate chelant comprising ethylenediamine-N,N-tetraacetic acid (EDTA), methylglycinediacetic acid (MGDA), and L-glutamic acid, N,N-diacetic acid (GLDA),

wherein the ratio of polycarboxylic acid polymer chelant(s) to L-glutamic acid, N,N-diacetic acid (GLDA) or salt thereof in combination with ethylenediamine-N,N-tetraacetic acid (EDTA) or salt thereof, is between about 0.17:1 to about 0.42:1.