Olefinically unsaturated phosphonate compounds, polymers made therefrom and their use
View Patent ↗This invention relates to compounds of formulae (1a) and (1b) wherein R means H or C 1 - to C 6 -alkyl, X is a structural unit selected from the formulae wherein m and k mean independently from each other a number from 1 to 12 for (4) and (5) and from 1 to 11 for (6), Y is a structural unit selected from the formulae wherein a, b independently from each other are integers from 1 to 10 R means hydrogen or C 1 - to C 6 -alkyl R 2 means an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms R 3 , R 4 , R 5 , R 6 independently from each other mean an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms, Z means a cation, and n means an integer being two or higher.
1. A compound of formulae (1 a) and (1 b)
wherein
R is a H or C 1 - to C 6 -alkyl,
X is a structural unit selected from the group consisting of formulae
wherein m and k are independently from each other a number from 1 to 12 for (4) and (5) and from 1 to 11 for (6),
Y is a structural unit selected from the group consisting of formulae
wherein
a, b independently from each other are integers from 1 to 10
R is a hydrogen or C 1 - to C 6 -alkyl
R 2 is an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms
R 3 , R 4 , R 5 , R 6 independently from each other are an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms,
Z is a cation, and
n is an integer being two or higher.
2. A compound according to claim 1 , wherein X is —(CH 2 )—O—(CH 2 )—.
3. A compound according to claim 1 , wherein Z is selected from the group consisting of an alkali metal, alkaline earth metal, ammonium and organic base cations.
4. A compound according to claim 1 , corresponding to one of the formulae (15) to (19)
5. A polymer and oligomer, comprising 2 wt.-% to 100 wt.-% of repetitive structural units of the formulae (1c) and/or (1d)
the polymers having a molecular weight of from 800 to 30,000 g/mol, wherein R, X, Y, Z and n are defined as in claim 1 .
6. A polymer and oligomer according to claim 5 , where the monomers copolymerised with the repetitive structural units of the formulae (1c) and/or (1d)
wherein R, X, Y, Z and n are defined as in claim 5 , are selected from the group consisting of acrylic acid and its esters and salts, methacrylic acid and its esters and salts, maleic acid and its esters and salts, fumaric acid and its esters and salts, crotonic acid and its esters and salts, itaconic acid and its esters and salts, mesaconic acid and its esters and salts, citraconic acid and its esters and salts, angelic acid, vinyl acetate, vinyl chloride, vinyl pyridine, vinyl pyrrolidone, acrylamide and its derivatives, 2-acrylamido-2-methylpropane sulphonic acid and its salts, styrene-4-sulphonic acid and its salts, allyl sulphonic acid and its salts, methallylsulphonic acid and its salts, vinyl sulphonic acid and its salts, vinyl phosphonic acid and its salts, dialkylaminoacrylates and methacrylates and their quaternary derivatives, diallyldimethylammonium chloride and 3-allyloxy-2-hydroxypropyltrimethylammonium chloride.
7. A polymer and oligomer according to claim 5 , wherein the acid groups are fully or partially neutralised to form salts with one or more cations selected from the group consisting of sodium, potassium, calcium, magnesium, aluminum, zinc, ammonium, the cations derived from the amines mono, di or trimethylamine, mono, di or triethylamine, monoethanolamine, diethanolamine, and triethanolamine.
8. A process of manufacture of the compounds according to claim 1 , wherein the process comprises the step of reacting a compound of formula 2
with a compound of formula 3
wherein
R is a H or C 1 - to C 6 -alkyl,
X is a structural unit selected from the group consisting of formulae
wherein m and k are independently from each other a number from 1 to 12 for (4) and (5) and from 1 to 11 for (6),
Y is a structural unit selected from the group consisting of formulae
wherein
a, b independently from each other are integers from 1 to 10
R is a hydrogen or C 1 - to C 6 -alkyl
R 2 is an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms
R 3 , R 4 , R 5 , R 6 independently from each other are an alkylene or alkylidene group having 1 to 6 carbon atoms or an arylene or alkylarylene group having from 6 to 20 carbon atoms,
Z is a cation, and
n is an integer being two or higher.
9. A process according to claim 8 , whereby allyl glycidyl ether is reacted with hydroxyethylidenediphosphonic acid or its salts.
10. A process of inhibiting scale deposition from an aqueous system, the process comprising the step of adding an oligomer or polymer according to claim 5 to the aqueous system.
11. A process according to claim 10 , wherein the aqueous system is the formation water associated with an oilwell and/or the water injected into an oilwell to aid oil recovery.
12. A process according to claim 10 , wherein the scale comprises the carbonates and/or sulphates of one or more of the group consisting of calcium, magnesium, barium, strontium, radium, and iron.
13. A process according to claim 10 , wherein the scale inhibitor is used in an oilfield squeeze treatment.