Mixtures composed of monocarboxy-functionalized dialkylphosphinic esters and of further components

1. A process for preparation of a composition comprising:

A) from 98 to 100% by weight of at least one monocarboxy-functionalized dialkylphosphinic ester of the formula (I)

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are identical or different and independently of one another, are H, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, or phenyl,

Y is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, phenyl, 2-hydroxyethyl, 2,3-dihydroxypropyl, 2-hydroxypropyl, 3-hydroxypropyl, 4-hydroxybutyl, 3-hydroxybutyl, 2-hydroxybutyl, 6-hydroxyhexyl, allyl, or glycerol,

X is H, Li, Na, K or NH 4 ,

or X is defined as for Y, and then X and Y are two identical radicals or two different radicals of the above organic radicals, and

B) from 0 to 2% by weight of at least one halogen, wherein the at least one halogen is a chemical compound in which atoms of the 7th main group of the periodic table of elements are present and have chemical bonding to carbon or to phosphorus or salts containing halide anions,

where the entirety of the components always amounts to 100% by weight, comprising the step of reacting hypophosphorous acid or a salt thereof (component C) of the formula II

wherein X is H, Na, K, or NH 4 in the presence of at least one free-radical initiator with at least one α,β-unsaturated carboxylic acid derivative (component D) of the formula III,

wherein Z is C 1-18 -alkyl or C 6-18 -aryl or is Y, or with at least one α,β-unsaturated carboxylic acid (component D′) of the formula IV

and with at least one olefin (component E) of the formula V

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are defined in the formulae III, IV, and V as in formula I, and wherein when formula IV is used an esterification step with Y—OH follows.

2. The process as claimed in claim 1 , wherein, in a step 1, component C is reacted in the presence of the at least one free-radical initiator with component E to give an alkylphosphorous acid and, in step 2, the resultant reaction solution is esterified with an alcohol M-OH to produce phosphous ester in the resultant reaction mixture, and the phosphonous ester is removed by distillation and, in a step 3, the resultant reaction mixture is reacted in the presence of the at least one free-radical initiator or of a basic initiator with component D to give the at least one monocarboxy-functionalized dialkylphosphinic ester.

3. The process as claimed in claim 1 , wherein, in a step 1, component C is reacted in the presence of the at least free-radical initiator with component E to give an alkylphosphonous acid and, in step 2, the resultant reaction solution is esterified with an alcohol M-OH to produce phosphonous ester in the resultant reaction solution and the phosphonous ester is removed by distillation and, in a step 3, the resultant reaction mixture is reacted in the presence of the at least one free-radical initiator or of a basic initiator with component D′ to give the at least one monocarboxy-functionalized dialkylphosphinic ester, where X=alkyl, Y═H, and then, in a step 4, the dialkylphosphinic ester is esterified with an alcohol Y—OH at the carboxy function, giving a monocarboxy-functionalized dialkylphosphinic ester A.

4. The process as claimed in claim 3 , wherein, in step 2, the alkylphosphonous acid is directly esterified with a linear or branched alcohol of the formula M-OH, where M is a linear or branched alkyl radical having from 1 to 10 carbon atoms.

5. The process as claimed in claim 4 , wherein the alcohol M-OH is n-butanol, isobutanol, or ethylhexanol.

6. The process as claimed in claim 1 , wherein component C is the ammonium or sodium salt of hypophosphorous acid.

7. The process as claimed in claim 1 , wherein the at least one free radical initiator is a free-radical, anionic, cationic, or photochemical initiator.

8. The process as claimed in claim 1 , wherein the at least one free radical initiator is a peroxide-forming compound, a peroxo compound, an azo compound or a mixture thereof.

9. The process as claimed in claim 1 , wherein the at least one α,β-unsaturated carboxylic acid is acrylic acid, methyl acrylate, ethyl acrylate, methacrylic acid, hydroxyethyl acrylate, crotonic acid, ethyl crotonate, tiglic acid (trans-2,3-dimethylacrylic acid), (trans-)2-pentenoic acid or a mixture thereof.

10. The process as claimed in claim 1 , wherein the at least one olefin (component E) is ethylene, propylene, n-butene, and/or isobutene, 1-hexene, 1-heptene, and/or 1-octene; allyl alcohol, allylamine, allylbenzene, allylanisole, styrene, α-methylstyrene, 4-methylstyrene, vinyl acetate or a mixture thereof.

11. The process as claimed in claim 1 , wherein the reaction of component C with components D, E or both takes place at a temperature of from 50 to 150° C.

12. A process for preparation of a composition comprising:

A) from 98 to 100% by weight of at least one monocarboxy-functionalized dialkylphosphinic ester of the formula (I)

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are identical or different and, independently of one another, are H, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, or phenyl,

Y is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, phenyl, 2-hydroxyethyl, 2,3-dihydroxypropyl, 2-hydroxypropyl, 3-hydroxypropyl, 4-hydroxybutyl, 3-hydroxybutyl, 2-hydroxybutyl, 6-hydroxyhexyl, allyl, or glycerol,

X is H, Li, Na, K or NH 4 ,

or X is defined as for Y, and then X and Y are two identical radicals or two different radicals of the above organic radicals, and

B) from 0 to 2% by weight of at least one halogen, wherein the at least one halogen is a chemical compound in which atoms of the 7th main group of the periodic table of elements are present and have chemical bonding to carbon or to phosphorus or salts containing halide anions,

where the entirety of the components always amounts to 100% by weight comprising the steps of reacting a hypophosphorous acid or a salt thereof (component C) of the formula II

wherein X is H, Na, K, or NH 4 , with a ketone to give 1-hydroxy-1-dialkylphosphinate, reacting the 1-hydroxy-1-dialkylphosphinate, in the presence of at least one free-radical initiator with at least one α,β-unsaturated carboxylic acid derivative (component D) of the formula III,

wherein Z is C 1-18 -alkyl or C 6-18 -aryl or is Y, removing the ketone to form a resultant reaction mixture, and reacting the resultant reaction mixture, in the presence of the at least one free-radical initiator with at least one olefin (component E) of the formula V

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are defined in the formulae III, IV, and V as in formula I.

13. A process for preparation of a composition comprising:

A) from 98 to 100% by weight of at least one monocarboxy-functionalized dialkylphosphinic ester of the formula (I)

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are identical or different and, independently of one another, are H, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, or phenyl,

Y is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, phenyl, 2-hydroxyethyl, 2,3-dihydroxypropyl, 2-hydroxypropyl, 3-hydroxypropyl, 4-hydroxybutyl, 3-hydroxybutyl, 2-hydroxybutyl, 6-hydroxyhexyl, allyl, or glycerol,

X is H, Li, Na, K or NH 4 ,

or X is defined as for Y, and then X and Y are two identical radicals or two different radicals of the above organic radicals, and

B) from 0 to 2% by weight of at least one halogen, wherein the at least one halogen is a chemical compound in which atoms of the 7th main group of the periodic table of elements are present and have chemical bonding to carbon or to phosphorus or salts containing halide anions,

where the entirety of the components always amounts to 100% by weight, comprising the steps of reacting a hypophosphorous acid or a salt thereof (component C) of the formula II

wherein X is H, Na, K, or NH 4 with a ketone to give 1-hydroxy-1-dialkylphosphinate, reacting the 1-hydroxy-1-dialkylphosphinate in the presence of at least one free-radical initiator with at least one α,β-unsaturated carboxylic acid (component D′) of the formula IV

removing the ketone to form a resultant reaction mixture, and reacting the resultant reaction mixture, in the presence of the at least one free-radical initiator with at least one olefin (component E) of the formula V

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are defined in the formulae III, IV, and V as in formula I to form the monocarboxy-functionalized dialkylphosphinic acid, where Y═H; and reacting the monocarboxy-functionalized dialkylphosphinic acid with an alcohol YOH to give the monocarboxy-functionalized dialkylphosphinic ester.

14. A process for preparation of a composition comprising:

A) from 98 to 100% by weight of at least one monocarboxy-functionalized dialkylphosphinic ester of the formula (I)

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are identical or different and, independently of one another, are H, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, or phenyl,

Y is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, phenyl, 2-hydroxyethyl, 2,3-dihydroxypropyl, 2-hydroxypropyl, 3-hydroxypropyl, 4-hydroxybutyl, 3-hydroxybutyl, 2-hydroxybutyl, 6-hydroxyhexyl, allyl, or glycerol,

X is H, Li, Na, K or NH 4 ,

or X is defined as for Y, and then X and Y are two identical radicals or two different radicals of the above organic radicals, and

B) from 0 to 2% by weight of at least one halogen, wherein the at least one halogen is a chemical compound in which atoms of the 7th main group of the periodic table of elements are present and have chemical bonding to carbon or to phosphorus or salts containing halide anions,

where the entirety of the components always amounts to 100% by weight, comprising the steps of reacting hypophosphorous acid or a salt thereof (component C) of the formula II

wherein X is H, Na, K, or NH 4 with acetone to give 1 -hydroxy-1 -methylethylphosphinate, reacting the 1-hydroxy-1-methylethyl-phosphinate, in the presence of at least one free-radical initiator with at least one olefin (component E) of the formula V

wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are defined in the formulae III, IV, and V as in formula I, removing the acetone to form a resultant reaction mixtures, and reacting the resultant reaction mixture, in the presence of the at least one free-radical initiator with at least one α,β-unsaturated carboxylic acid derivative (component D) of the formula III,

wherein Z is C 1-18 -alkyl or C 6-18 -aryl or is Y, or with at least one α,β-unsaturated carboxylic acid (component D′) of the formula IV

15. The process as claimed in claim 14 , wherein, after the reaction with component D′, the monocarboxy-functionalized dialkylphosphinic acid thus obtained, wherein Y═H is reacted with an alcohol YOH to give the monocarboxy-functionalized dialkylphosphinic ester.