- Synthesis and characterization of 3-[N-(2-methacroyloylethyl)-N,N-dimethylamino]propane sulfonate and its crystal structure
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3-[N-(2-Methacroyloylethyl)-N,N-dimethylamino]propane sulfonate (DMAPS) was synthesized by the ring-opening reaction of 1,3- propanesultone, then electrophilic substitution with 2-(dimethylamino)ethyl methacrylate in the presence of acetone at 60 °C. 2-(Dimethylamino)ethyl methacrylate and a little polymerization inhibitor dissolved in acetone was added in three-necked flask, the mixture was heated to 60 °C. 1,3-Propanesultone was dissolved in acetone and then be added drop-wise into the flask over 8 h. The product was characterized by NMR and Mass spectrum. The crystal structure of 3-[N-(2-Methacroyloylethyl)-N,N-dimethylamino]propane sulfonate was investigated using X-ray diffraction and SHELXTL97 software and the result indicated that DMAPS crystallized in the orthorhombic system, space group P21/c with a = 14.6818(18), b = 7.1104(9), c = 14.9180(18) ?, V = 1548.5(3) ?3; Z = 4.
- Xiao, Jian,Zhang, Xiu-Qin,Wang, Kai,Chen, Qiang,Xue, Wei-Wei
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- COMPOSITION INCLUDING DIALKYL TIN OXIDE AND USE THEREOF AS A TRANSESTERIFICATION CATALYST FOR THE SYNTHESIS OF (METH) ACRYLIC ESTERS
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The present invention relates to a composition including a dialkyl tin oxide, such as DBTO, which can be used as a transesterification catalyst for the synthesis of (meth)acrylic esters. The invention also relates to a method for the synthesis of (meth)acrylic esters by transesterification in the presence of said composition.
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Page/Page column 4-5
(2012/05/21)
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- Process for making a (meth)acrylamide monomer
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A method for making a (meth)acrylamide monomer, comprises reacting a (meth)acrylate ester with an amino-functional compound in an organic solvent in the presence of a transesterification catalyst.
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Page/Page column 4- 5
(2008/12/07)
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- MANUFACTURE OF ESTERS
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The invention relates to a process in which a compound R1COOR3 (I) is made by a transesterification reaction of an ester compound R1COOR2 (II) with an alcohol R3OH (III) in the presence of a transesterification catalyst, wherein R1 is H or C1-4 alkyl or CH2=CR4-; R2 is C1-4 alkyl; R3 is selected from the group consisting of alkyl having at least 4 carbon atoms, cycloalkyl having at least 5 carbon atoms, aryl, aralkyl, alkaryl and amino alkyl; and R4 is -H or - C1-4 alkyl, wherein alcohol R2OH (IV) is formed as a byproduct and in which said byproduct (IV) is removed by distillation in the presence of an entrainer, in which the entrainer is a compound that suppresses the formation of an azeotrope between compound (II) and byproduct (IV). The process can be useful in the preparation of esters such as dimethyl amino ethyl (meth) acrylate. The invention also provides a method of separating alcohols and esters. In a further form of the invention a process of preparing esters by a transesterification process is provided in which the transesterification catalyst is homogenous.
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Page/Page column 21-22
(2008/06/13)
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- Multi-purpose polymers, methods and compositions
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Disclosed are multi-purpose polymers that are the polymerization product of a monomer mixture comprising at least one amino-substituted vinyl monomer; at least one nonionic vinyl monomer; at least one associative vinyl monomer; at least one semihydrophobic vinyl surfactant monomer; and, optionally, comprising one or more hydroxy-substituted nonionic vinyl monomer, crosslinking monomer, chain transfer agent or polymeric stabilizer. These vinyl addition polymers have a combination of substituents, including amino substituents that provide cationic properties at low pH, hydrophobic substituents, hydrophobically modified polyoxyalkylene substituents, and hydrophilic polyoxyalkylene substituents. The polymers provide surprisingly beneficial rheological properties in acidic aqueous compositions, and are compatible with cationic materials. The multi-purpose polymers are useful in a variety of products for personal care, health care, household care, institutional and industrial care, and industrial applications.
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- Multi-purpose polymers, methods and compositions
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Disclosed are multi-purpose polymers that are the polymerization product of a monomer mixture comprising at least one amino-substituted vinyl monomer; at least one nonionic vinyl monomer; at least one associative vinyl monomer; at least one semihydrophobic vinyl surfactant monomer; and, optionally, comprising one or more hydroxy-substituted nonionic vinyl monomer, crosslinking monomer, chain transfer agent or polymeric stabilizer. These vinyl addition polymers have a combination of substituents, including amino substituents that provide cationic properties at low pH, hydrophobic substituents, hydrophobically modified polyoxyalkylene substituents, and hydrophilic polyoxyalkylene substituents. The polymers provide surprisingly beneficial Theological properties in acidic aqueous compositions, and are compatible with cationic materials. Additionally, this invention relates to the incorporation of a basic material after the addition of an acidic material to reduce the pH of the composition without negatively impacting the viscosity of the composition. The multi-purpose polymers are useful in a variety of products for personal care, health care, household care, institutional and industrial care, and industrial applications.
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