	US 12,065,629 B2
	Hardness additives comprising an acrylate/aminocarboxylate mixture and block detergents containing said 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 Sep. 12, 2023, as Appl. No. 18/465,320.
Application 18/465,320 is a continuation of application No. 17/814,592, filed on Jul. 25, 2022, granted, now 11,788,032.
Application 17/814,592 is a continuation of application No. 16/804,377, filed on Feb. 28, 2020, granted, now 11,421,186, issued on Aug. 23, 2022.
Claims priority of provisional application 62/811,656, filed on Feb. 28, 2019.
Prior Publication US 2023/0416648 A1, Dec. 28, 2023
Int. Cl. C11D 3/33 (2006.01); C11D 1/72 (2006.01); C11D 3/10 (2006.01); C11D 3/37 (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:

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

2) from about 60 wt-% to about 95 wt-% of an aminocarboxylate chelant mixture comprising ethylenediamine-N, N-tetraacetic acid (EDTA), methylglycinediacetic acid (MGDA), and glutamic acid N,N-diacetic acid (GLDA), wherein the ratio of polycarboxylic acid polymer chelant(s) to aminocarboxylate chelant satisfies the following;

(A) the ratio of polycarboxylic acid polymer chelant(s) to 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; and the ratio of polycarboxylic acid polymer chelant(s) to aminocarboxylate chelant satisfies at least one of the following;

(B) the ratio of polycarboxylic acid polymer chelant(s) to methylglycinediacetic acid (MGDA) or salt thereof, is between about 0.06:1 to about 0.12:1; and/or

(C) the ratio of polycarboxylic acid polymer chelant(s) to ethylenediamine-N,N-tetraacetic acid (EDTA) or salt thereof, is between about 0.2:1 to about 0.5:1.