The present invention relates to the use of a stabilizing composition comprising at least one N-oxyl compound and at least one polymerization inhibitor other than an N-oxyl compound, for inhibiting transesterification catalyst degradation in a process for the synthesis of aminoalkyl (meth)acrylates. Preferably, the transesterification catalyst is a titanium organometallic compound and the stabilising composition comprises at least one N-oxyl derivative and at least one polymerization inhibitor chosen from phenolic compounds and phenothiazine compounds in a weight ratio of between 1 and 10, preferably between 4 and 10, limits inclusive.

The present invention relates to the use of a stabilizing composition comprising at least one N-oxyl compound and at least one polymerization inhibitor other than an N-oxyl compound, for inhibiting transesterification catalyst degradation in a process for the synthesis of aminoalkyl (meth)acrylates. Preferably, the transesterification catalyst is a titanium organometallic compound and the stabilising composition comprises at least one N-oxyl derivative and at least one polymerization inhibitor chosen from phenolic compounds and phenothiazine compounds in a weight ratio of between 1 and 10, preferably between 4 and 10, limits inclusive.

The present invention relates to the use of a stabilizing composition comprising at least one N-oxyl compound and at least one polymerization inhibitor other than an N-oxyl compound, for inhibiting transesterification catalyst degradation in a process for the synthesis of aminoalkyl (meth)acrylates. Preferably, the transesterification catalyst is a titanium organometallic compound and the stabilising composition comprises at least one N-oxyl derivative and at least one polymerization inhibitor chosen from phenolic compounds and phenothiazine compounds in a weight ratio of between 1 and 10, preferably between 4 and 10, limits inclusive.

The invention relates to a method for producing at least one metal amino alcoholate, at least comprising the following steps (A) providing at least one amino alcohol, (B) adding at least one basic compound to the at least one amino alcohol provided in step (A) in order to obtain at least one corresponding amino alcoholate, and (C) adding at least one metal halogenide to the mixture obtained in step (C) in order to obtain a corresponding metal amino alcoholate, wherein in step (C) the at least one metal halogenide is added as a solution in a protic solvent at a concentration of 2.0 to 35.0 wt. %; a solution containing at least one metal alcoholate obtained in this manner; the use of the solution to produce a composition; a corresponding composition; the use of said composition to produce single- or multi-layer paint structures; a method for single- or multi-layer coating of a substrate with a paint structure; and a substrate coated in this manner.

The invention relates to a method for producing at least one metal amino alcoholate, at least comprising the following steps (A) providing at least one amino alcohol, (B) adding at least one basic compound to the at least one amino alcohol provided in step (A) in order to obtain at least one corresponding amino alcoholate, and (C) adding at least one metal halogenide to the mixture obtained in step (C) in order to obtain a corresponding metal amino alcoholate, wherein in step (C) the at least one metal halogenide is added as a solution in a protic solvent at a concentration of 2.0 to 35.0 wt. %; a solution containing at least one metal alcoholate obtained in this manner; the use of the solution to produce a composition; a corresponding composition; the use of said composition to produce single- or multi-layer paint structures; a method for single- or multi-layer coating of a substrate with a paint structure; and a substrate coated in this manner.

N,N-(di)alkylaminoalkyl(meth)acrylamide or N,N-(di)alkylaminoalkyl (meth)acrylate and/or a quaternary ammonium salt thereof are prepared with a low content of a compound of formula (IV)

##STR00001##

wherein R.sub.5 in each case is a linear, branched or cyclic alkyl radical, an aryl radical which may also be substituted by one or more alkyl groups, the linear, cyclic or branched alkyl radical may have a length of 1-12 carbon atoms and is, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, hexyl, heptyl, octyl, isooctyl, nonyl, decyl, undecyl, dodecyl.

N,N-(di)alkylaminoalkyl(meth)acrylamide or N,N-(di)alkylaminoalkyl (meth)acrylate and/or a quaternary ammonium salt thereof are prepared with a low content of a compound of formula (IV)

##STR00001##

wherein R.sub.5 in each case is a linear, branched or cyclic alkyl radical, an aryl radical which may also be substituted by one or more alkyl groups, the linear, cyclic or branched alkyl radical may have a length of 1-12 carbon atoms and is, for example, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, hexyl, heptyl, octyl, isooctyl, nonyl, decyl, undecyl, dodecyl.

The invention relates to the production of (meth)acrylic esters according to a continuous process by transesterification, and in particular to the purification of a crude reaction mixture comprising a C.sub.4-C.sub.12 (meth)acrylic ester using a divided wall column employed in a particular configuration. This configuration results in a simplification of the purification process with a reduced energy consumption and a minimized content of impurities present in the purified (meth)acrylic ester. The invention also relates to a process for the production of C.sub.4-C.sub.12 (meth)acrylic ester comprising this recovery/purification process.

The invention relates to the production of (meth)acrylic esters according to a continuous process by transesterification, and in particular to the purification of a crude reaction mixture comprising a C.sub.4-C.sub.12 (meth)acrylic ester using a divided wall column employed in a particular configuration. This configuration results in a simplification of the purification process with a reduced energy consumption and a minimized content of impurities present in the purified (meth)acrylic ester. The invention also relates to a process for the production of C.sub.4-C.sub.12 (meth)acrylic ester comprising this recovery/purification process.

This invention relates to an anionic-cationic-nonionic surfactant as substantially represented by the formula (I), production and use thereof in tertiary oil recovery. The anionic-cationic-nonionic surfactant of this invention exhibits significantly improved interfacial activity and stability as compared with the prior art. With the present anionic-cationic-nonionic surfactant, a flooding fluid composition for tertiary oil recovery with improved oil displacement efficiency and oil washing capability as compared with the prior art could be produced.

##STR00001##

In the formula (I), each group is as defined in the specification.