摘要:
The invention relates to a process for continuously preparing N-alkyl(meth)acrylamides by reacting alkyl (meth)acrylates with high-boiling amines. A catalyst activation and specific workup technique achieve product qualities which have not been achieved to date. In addition, very high space-time yields and overall yields can be achieved.
摘要:
The invention relates to a process for continuously preparing N-alkyl(meth)acrylamides by reacting alkyl(meth)acrylates with high-boiling amines. A catalyst activation and specific workup technique achieve product qualities which have not been achieved to date. In addition, very high space-time yields and overall yields can be achieved.
摘要:
The present invention relates to a process for preparing an unsaturated carboxylic acid anhydride by reacting an unsaturated carboxylic acid and a lower aliphatic carboxylic acid anhydride in the presence of a stabilizer and catalyst that contains a metal salt of an anionic organic compound which has at least one carboxyl group.
摘要:
The present invention relates to a (meth)acrylate polymer for preparing a coating composition, where the (meth)acrylate polymer comprises 0.5% to 20% by weight of units derived from (meth)acrylic monomers which in the alkyl radical have at least one double bond and 8 to 40 carbon atoms, 0.1% to 60% by weight of units derived from hydroxyl-containing monomers which have up to 9 carbon atoms, 0.1% to 95% by weight of units derived from (meth)acrylates having 1 to 12 carbon atoms in the alkyl radical, and 0.1% to 60% by weight of units derived from styrene monomers, based in each case on the weight of the (meth)acrylate polymer, and the (meth)acrylate polymer has a weight-average molecular weight in the range from 2000 to 60 000 g/mol. The present invention further relates to a coating composition and to a method of producing a coating. The present invention describes, furthermore, a coated article comprising a coating obtainable by the method.
摘要:
Process for preparing (meth)acrylates of the formula (I) CH2═C(R1)—CO—O—R2 (I) in which R1 is hydrogen or methyl and R2 is a saturated or unsaturated, linear or branched, aliphatic or cyclic alkyl radical having 6 to 22 carbon atoms, or a (C6-C14)-aryl-(C1-C8)-alkyl radical; by reacting a (meth)acrylate of the formula II CH2═C(R1)—CO—OR3 (II) with an alcohol of the formula (III) HO—R2 (III) in the presence of an amount of a suitable catalyst which catalyses the reaction and of an amount of a phenolic polymerization inhibitor or a combination of two or more phenolic polymerization inhibitors which is sufficient to inhibit undesired polymerization; the reaction being undertaken with input or introduction into the reaction mixture resulting from the reaction of an amount of oxygen or of an oxygenous gas mixture sufficient to inhibit undesired polymerization, and the process is characterized in that the specific total oxygen input is less than or equal to 1.0 l/kg, measured in litres of oxygen per kilogram of (meth)acrylate of the formula (I), where the volume of oxygen introduced is calculated at a temperature of 25° C. and a pressure of 101 325 pascal. The resulting (meth)acrylates can surprisingly be processed to particularly high molecular weight emulsion polymers which are, for example, outstandingly suitable for use as flow resistance reducers in mineral oil extraction.
摘要:
Process for preparing (meth)acrylates of the formula (I) CH2═C(R1)—CO—O—R2 (I) in which R1 is hydrogen or methyl and R2 is a saturated or unsaturated, linear or branched, aliphatic or cyclic alkyl radical having 6 to 22 carbon atoms, or a (C6-C14)-aryl-(C1-C8)-alkyl radical; by reacting a (meth)acrylate of the formula II CH2═C(R1)—CO—OR3 (II) with an alcohol of the formula (III) HO—R2 (III) in the presence of an amount of a suitable catalyst which catalyzes the reaction and of an amount of a phenolic polymerization inhibitor or a combination of two or more phenolic polymerization inhibitors which is sufficient to inhibit undesired polymerization; the reaction being undertaken with input or introduction into the reaction mixture resulting from the reaction of an amount of oxygen or of an oxygenous gas mixture sufficient to inhibit undesired polymerization, and the process is characterized in that the specific total oxygen input is less than or equal to 1.0 l/kg, measured in liters of oxygen per kilogram of (meth)acrylate of the formula (I), where the volume of oxygen introduced is calculated at a temperature of 25° C. and a pressure of 101 325 pascal. The resulting (meth)acrylates can surprisingly be processed to particularly high molecular weight emulsion polymers which are, for example, outstandingly suitable for use as flow resistance reducers in mineral oil extraction.
摘要:
The present invention relates to mixtures containing A) compounds of the formula (I) and (II) where R1 is independently at each instance hydrogen or a methyl radical, R2 is independently at each instance a linear or branched, aliphatic or cycloaliphatic radical or a substituted or unsubstituted aromatic or heteroaromatic radical and m and n are each independently an integer of not less than 0 subject to the proviso that m+n>0, and B) at least one ethylenically unsaturated monomer (A) which is different from the compounds of the formula (I) and (II). The present invention further relates to processes for polymerizing these mixtures, the highly transparent polymers thus obtainable and to their use.
摘要:
The present invention relates to mixtures containing A) compounds of the formula (I) and (II) where R1 is independently at each instance hydrogen or a methyl radical, R2 is independently at each instance a linear or branched, aliphatic or cycloaliphatic radical or a substituted or unsubstituted aromatic or heteroaromatic radical and m and n are each independently an integer of not less than 0 subject to the proviso that m+n>0, and B) at least one ethylenically unsaturated monomer (A) which is different from the compounds of the formula (I) and (II). The present invention further relates to processes for polymerizing these mixtures, the highly transparent polymers thus obtainable and to their use.
摘要:
The invention describes anemulsion polymer which can be obtained by polymerization of a mixture comprising a) from 5 to 99.9% by weight of one or more monomers having a solubility in water of 2% by weight at 20° C.; and e) 0.1-95% by weight of at least one activator, with the components a) to e) adding up to 100% by weight of the polymerizable constituents of the mixture, and is characterized in that e1) the activator is a compound of the Formula I, where the radicals R1 to R7 and X have the meanings given in the description; and in that e2) the activator e) is incorporated via covalent bonds into the emulsion polymer. The emulsion polymer makes it possible to form core-shell polymers having a protected activator fixed to the polymer and can be used particularly advantageously for controlling the pot life of two-component or multicomponent systems, for example in adhesives, pourable resins, floor coatings, compositions for reactive pegs, dental compositions or sealing compositions.