Method of producing magnetic powder and method of producing magnetic recording medium
US-11830533-B2 · Nov 28, 2023 · US
Composition and Method for Stabilizing Iron Compounds in an Aqueous Environment, and Use of Composition
US2020354248A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020354248-A1 |
| Application number | US-201816963272-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 27, 2018 |
| Priority date | Feb 27, 2018 |
| Publication date | Nov 12, 2020 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A composition for stabilizing iron compounds in an aqueous environment, includes a polycarboxylic acid or its salt(s), at least one monomeric or polymeric phosphonate including at least one phosphonic acid group, or its salt(s), at least one corrosion inhibitor including amino groups, and 1-15 weight-% of polycitric acid or a copolymer of citric acid with polyols or glycerol, calculated as an active ingredient from a total weight of constituents in the composition, as dry.
First claim
Opening claim text (preview).
1 . A composition for stabilizing iron compounds in an aqueous environment, comprising: a polycarboxylic acid or its salt(s), at least one monomeric or polymeric phosphonate comprising at least one phosphonic acid group, or its salt(s), at least one corrosion inhibitor comprising amino groups, and 1-15 weight-% of polycitric acid or a copolymer of citric with polyols or glycerol, calculated as an active ingredient from a total weight of the constituents in the composition, as dry. 2 . The composition according to claim 1 , wherein the polycarboxylic acid is selected from poly(meth)acrylic acid, or a copolymer of (meth)acrylic acid and maleic acid, itaconic acid or lactic acid, preferably a poly(meth)acrylic acid. 3 . The composition according to claim 1 , wherein the polycarboxylic acid has a weight average molecular weight (MW) less than 5000 g/mol, preferably in a range of 1000-5000 g/mol, determined by using gel permeation chromatography (GPC). 4 . The composition according to claim 1 , wherein the phosphonate is selected from hydroxyethylene diphosphonic acid (HEDP), amino tris(methylenephosphonic acid) (ATMP), 2-phosphonobutane-1,2,4,-tricarboxylic acid (PBTC), diethylenetriamine penta(methylene phosphonic acid) (DTPMPA), hexamethylenediamine tetramethylene phosphonic acid (BHMTPMPA), polyamino polyether methylene phosphonic acid (PAPEMP) or any combination of them, preferably polyamino polyether methylene phosphonic acid (PAPEMP). 5 . The composition according to claim 1 , wherein the corrosion inhibitor is selected from diethyl hydroxylamine (DEHA), octadecylamine, hexadecylamine, cyclohexylamine, methoxypropylamine, other fatty alcohol amines or any combination of them, preferably diethyl hydroxylamine (DEHA). 6 . The composition according to claim 1 , wherein an amount of the polycarboxylic acid is in a range of 5-80 weight-%, preferably 20-50 weight-% and more preferably 20-30 weight-%, calculated from a total weight of the constituents in the composition, as dry. 7 . The composition according to claim 1 , wherein an amount of the monomeric or polymeric phosphonate(s) is in a range of 10-90 weight-%, preferably 60-90 weight-% and more preferably 70-80 weight-%, calculated from a total weight of the constituents in the composition, as dry. 8 . The composition according to claim 1 , wherein an amount of the corrosion inhibitor is in range of 2-10 weight-%, calculated from a total weight of the constituents in the composition, as dry. 9 . (canceled) 10 . (canceled) 11 . (canceled) 12 . A method for stabilizing iron compounds in an aqueous system, comprising adding a composition according to claim 1 to the aqueous system. 13 . The method according to claim 12 , wherein the composition is added in an amount of 5-100 ppm, preferably 5-70 ppm, and more preferably 5-50 ppm. 14 . The method according to claim 12 , wherein the aqueous system is a water treatment system or a pulp bleaching process.
Assignees
Inventors
Classifications
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2020354248A1 cover?
- A composition for stabilizing iron compounds in an aqueous environment, includes a polycarboxylic acid or its salt(s), at least one monomeric or polymeric phosphonate including at least one phosphonic acid group, or its salt(s), at least one corrosion inhibitor including amino groups, and 1-15 weight-% of polycitric acid or a copolymer of citric acid with polyols or glycerol, calculated as an a…
- Who is the assignee on this patent?
- Kemira Oyj
- What technology area does this patent fall under?
- Primary CPC classification C01G49/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Nov 12 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).