Abstract: The hydroxyalkyl acrylate according to the present invention is characterized in that a content amount of an ester generated from acrylic acid dimer and an alkylene oxide is not more than 0.10 mass %. The method for producing a hydroxyalkyl acrylate according to the present invention is characterized in comprising the step of reacting acrylic acid with an alkylene oxide in the presence of a catalyst, wherein a content amount of acrylic acid dimer in the raw material acrylic acid is not more than 3.00 mass %.

Abstract: The hydroxyalkyl acrylate according to the present invention is characterized in that a content amount of an ester generated from acrylic acid dimer and an alkylene oxide is not more than 0.10 mass %. The method for producing a hydroxyalkyl acrylate according to the present invention is characterized in comprising the step of reacting acrylic acid with an alkylene oxide in the presence of a catalyst, wherein a content amount of acrylic acid dimer in the raw material acrylic acid is not more than 3.00 mass %.

Abstract: The objective of the present invention is to provide a highly stable hydroxyalkyl(meth)acrylate. The hydroxyalkyl(meth)acrylate according to the present invention is characterized in that a contained amount of dialkylene glycol is not more than 0.05 mass %.

Abstract: Processes for producing a hydroxyalkyl(meth)acrylate which comprise reacting (meth)acrylic acid with an alkylene oxide in the presence of a catalyst. A first process is characterized in that the amount of the acid ingredient is kept, on calculation, at 0.010 or more in terms of molar ratio to the catalyst present in the liquid reaction mixture and that the liquid reaction mixture from which the hydroxyalkyl(meth)acrylate has been distilled off is used in the subsequent reaction. A second process is characterized in that a dialkylene glycol mono(meth)acylate is supplied to the reaction system to cause the dialkyleneglycol mono(meth)acylate to coexist in the liquid reaction mixture.

Abstract: Processes for producing a hydroxyalkyl(meth)acrylate which comprise reacting (meth)acrylic acid with an alkylene oxide in the presence of a catalyst. A first process is characterized in that the amount of the acid ingredient is kept, on calculation, at 0.010 or more in terms of molar ratio to the catalyst present in the liquid reaction mixture and that the liquid reaction mixture from which the hydroxyalkyl(meth)acrylate has been distilled off is used in the subsequent reaction. A second process is characterized in that a dialkylene glycol mono(meth)acylate is supplied to the reaction system to cause the dialkyleneglycol mono(meth)acylate to coexist in the liquid reaction mixture.

Abstract: The present invention provides a process for inhibition of polymerization of a (meth)acrylate ester, which has an extremely higher effect of inhibition of polymerization than in cases where conventional polymerization inhibitors are used. In the process for inhibition of polymerization of a (meth)acrylate ester; an N-oxyl compound and at least one member selected from the group consisting of manganese salt compounds, copper salt compounds, 2,2,6,6-tetramethylpiperidine compounds, and nitroso compounds are used together as polymerization inhibitors, and further an acid is used.

Abstract: The present invention provides: a high-quality hydroxyalkyl (meth)acrylate of which the alkylene glycol di(meth)acrylate content and the acid component content are both low; and its novel production process. The hydroxyalkyl (meth)acrylate, which has a content, in terms of an alkylene glycol di(meth)acrylate as an impurity, of not more than 0.1 weight % and an acid component content of not more than 0.1 weight %, is obtained by a process comprising the step of carrying out a batch reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate; with the process making an adjustment as to charging of both raw materials in such a manner that, for, of a time as needed for supplying both raw materials, a supplying time of not less than 40% of a total supplying time when the raw materials as supplied have a temperature of not lower than 40° C.

Abstract: The present invention provides a novel production process for a hydroxyalkyl (meth)acrylate, in which it is possible that: in a batch reaction system, the amount of the hydroxyalkyl (meth)acrylate (which is the objective product) as produced is kept nearly on the same level as conventional and further, at the same time, there is suppressed the side production of the alkylene oxide's diaddition product (dialkylene glycol mono(meth)acrylate) that lowers the purity of the product to thus give a bad influence upon its quality.

Abstract: There is disclosed a novel production process for a hydroxyalkyl (meth)acrylate in which: the diffusion of harmful substances due to disposal of catalysts can be reduced; and also the amount of the catalyst as used can be greatly saved in the entire production process. This production process comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate; with the production process being characterized by further comprising the step of recovering the catalyst as has been used for the reaction.

Abstract: The present invention provides a process and its utilization in a process comprising the step of carrying out an addition reaction of an alkylene oxide to an addition-receiving substance in the presence of a resin catalyst, thereby producing the addition reaction product, when the resin catalyst as used for the reaction is persevered so as to recycle it after it is recovered, the unreacted alkylene oxide remaining in the resin catalyst can be prevented from polymerizing and solidifying during the preservation, and the resin catalyst accordingly can be preserved stably for a long time. The resin catalyst as recovered after it is used for the reaction may be preserved under any of the following conditions: 1) at a low temperature of not higher than 40° C.

Abstract: To sufficiently stabilize a hydroxyalkyl (meth)acrylate in spite of its easily polymerizable property, a hydroxyalkyl saturated-carboxylate and/or alkylene glycol as well as a phenol compound is added thereto.

Abstract: There is disclosed a novel production process for a hydroxyalkyl (meth)acrylate in which: the diffusion of harmful substances due to disposal of catalysts can be reduced; and also the amount of the catalyst as used can be greatly saved in the entire production process. This production process comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate; with the production process being characterized by further comprising the step of recovering the catalyst as has been used for the reaction.

Abstract: The present invention provides a novel production process for a hydroxyalkyl (meth)acrylate, in which it is possible that: in a batch reaction system, the amount of the hydroxyalkyl (meth)acrylate (which is the objective product) as produced is kept nearly on the same level as conventional and further, at the same time, there is suppressed the side production of the alkylene oxide's diaddition product (dialkylene glycol mono(meth)acrylate) that lowers the purity of the product to thus give a bad influence upon its quality.

Abstract: The present invention provides: a high-quality hydroxyalkyl (meth)acrylate of which the alkylene glycol di(meth)acrylate content and the acid component content are both low; and its novel production process. The hydroxyalkyl (meth)acrylate, which has a content, in terms of an alkylene glycol di(meth)acrylate as an impurity, of not more than 0.1 weight % and an acid component content of not more than 0.1 weight %, is obtained by a process comprising the step of carrying out a batch reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate; with the process making an adjustment as to charging of both raw materials in such a manner that, for, of a time as needed for supplying both raw materials, a supplying time of not less than 40% of a total supplying time when the raw materials as supplied have a temperature of not lower than 40° C.

Abstract: The present invention provides a process for inhibition of polymerization of a (meth)acrylate ester, which has an extremely higher effect of inhibition of polymerization than in cases where conventional polymerization inhibitors are used. In the process for inhibition of polymerization of a (meth)acrylate ester; an N-oxyl compound and at least one member selected from the group consisting of manganese salt compounds, copper salt compounds, 2,2,6,6-tetramethylpiperidine compounds, and nitroso compounds are used together as polymerization inhibitors, and further an acid is used.

Abstract: When carrying out a liquid-phase reaction by using a heterogeneous catalyst, the separation of the heterogeneous catalyst and the reaction liquid is carried out certainly and effectively. A reaction method involves carrying out a reaction in liquid phase by using a heterogeneous catalyst particle 30 in a reactor 10, and comprises the steps of: (a) allowing a reaction liquid 40 supplied into the reactor 10 from such as a supplying inlet 12 to react in the presence of the heterogeneous catalyst particle 30, and (b) passing the resultant reaction liquid 40 containing the heterogeneous catalyst particle 30 through a line screen 20 having an opening width where the heterogeneous catalyst particle 30 is not allowed to pass substantially, and then extracting the reaction liquid 40 separated from the heterogeneous catalyst particle 30 from the reactor 10 by way of such as an extracting outlet 14.

Abstract: The present invention provides a process for producing a hydroxyalkyl (meth)acrylate which enables to control sufficiently the formation of a diester at the time of a reaction and/or at the time of distillation. In the process for producing the hydroxyalkyl (meth)acrylate which comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide in the existence of a catalyst, (1) the reaction between (meth)acrylic acid and the alkylene oxide, or (2) distillation of the resultant hydroxyalkyl (meth)acrylate is performed in the coexistence of a liquid having the relative dielectric constant of not less than 20 at 25° C.

Abstract: The present invention provides a process for producing a hydroxyalkyl (meth)acrylate which comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide, wherein the process provides enablement for economically and efficiently recovering and recycling the unreacted residue of the alkylene oxide. The process for producing a hydroxyalkyl (meth)acrylate comprises the steps of, carrying out a reaction between (meth)acrylic acid and an alkylene oxide; stripping the unreacted residue of the alkylene oxide from the resultant reaction liquid; and causing a solvent to absorb the stripped alkylene oxide; wherein: water is used as the absorbing solvent; and an absorbing liquid resultant from the absorption of the unreacted residue of the alkylene oxide is used for production of an alkylene glycol.

Abstract: The present invention provides a process and its utilization in a process comprising the step of carrying out an addition reaction of an alkylene oxide to an addition-receiving substance in the presence of a resin catalyst, thereby producing the addition reaction product, when the resin catalyst as used for the reaction is persevered so as to recycle it after it is recovered, the unreacted alkylene oxide remaining in the resin catalyst can be prevented from polymerizing and solidifying during the preservation, and the resin catalyst accordingly can be preserved stably for a long time. The resin catalyst as recovered after it is used for the reaction may be preserved under any of the following conditions: 1) at a low temperature of not higher than 40° C.

Abstract: The present invention provides: a production process for a hydroxyalkyl(meth)acrylate, which can raise productivity together with avoiding danger of explosion, and further can suppress side-formation of impurities such as a diester or a monoester wherein the impurities have a bad influence on product quality. When the time from the start of adding an alkylene oxide (AO) till the end of supplying the entirety of the AO is defined as T (hour), the amount of more than 50% of the entirety of the AO is supplied before T/2 (hour) has passed since the start of adding the AO.