- Preparation process of long-chain alkyl (meth) acrylate
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The invention discloses a preparation process of long-chain alkyl (meth) acrylate, which adopts a polymerization inhibitor composition containing phenothiazine accounting for at least 10% of the totalmass of the composition as a polymerization inhibitor for esterification reaction. The invention solves the problem of self-polymerization in the post-treatment process, can effectively control the acidity of the product to obtain a colorless or white high-purity product, and has the advantages of high yield and expanded application range of the product; in addition, according to the preparationprocess, polymerized excessive (methyl) acrylic acid is recycled, so that a large amount of acid wastewater is prevented from being generated, and the comprehensive benefit is increased.
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Paragraph 0055; 0056; 0059; 0060
(2021/01/12)
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- Quaternary phosphonium salt-type antibacterial monomer and preparation method thereof
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The invention relates to a quaternary phosphonium salt-type antibacterial monomer shown in the formula and a preparation method thereof. One end of the monomer is an antibacterial group which is a quaternary phosphonium salt group, the other end of the monomer is a polymerizable group which is an acrylate group and the middle chain of the monomer is an alkyl chain segment. Through the polymerizable group, the monomer can be bonded to a dental restoration material through a chemical reaction so that the dental restoration material has long-term antibacterial properties. The invention also relates to a polymer prepared from the quaternary phosphonium salt-type antibacterial monomer as a polymerization monomer and also relates a dental restorative material containing the polymer.
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Paragraph 0041; 0042
(2017/01/02)
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- Synthesis and single-chain folding of amphiphilic random copolymers in water
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Amphiphilic random methacrylate copolymers, consisting of poly(ethylene glycol) (PEG) and alkyl pendent groups, undergo reversible single-chain self-folding in water via intramolecular hydrophobic interaction, to generate a dynamic unimolecular hydrophobic nanospace, similar in shape but structurally different relative to micelles and microgel star polymers. These copolymers were prepared by the ruthenium-catalyzed living radical copolymerization of a PEG methacrylate (PEGMA) and an alkyl methacrylate (RMA; R, -CnH 2n+1, n = 1-18), where copolymer composition, degree of polymerization, and hydrophobic R moiety were varied. Detailed structural and chain-folding characterization has revealed: single-chain folding is favored with the RMA content 20-40 mol % per chain; the hydrophobic inner compartment (or the self-folded structure) is stable even at a high polymer concentration (up to ～6 wt %); and folded-unfolded transition occurs on addition of methanol or by elevating solution temperature, finally to phase-separation above a lower critical solution temperature.
- Terashima, Takaya,Sugita, Takanori,Fukae, Kaoru,Sawamoto, Mitsuo
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p. 589 - 600
(2014/02/14)
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- Process for producing methacrylic ester
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A method of producing a methacrylic acid ester which comprises carrying out an ester-exchange reaction between methyl methacrylate and an alcohol or a phenol while removing by-product methanol as an azeotropic mixture with methyl methacrylate from the reaction system under reflux conditions, by the use of a reaction apparatus equipped with a distillation column. A methacrylic acid ester is produced with a good productivity by controlling the reflux ratio.
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Page/Page column 5-6
(2008/06/13)
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- Designing polymers for biphasic liquid/liquid separations after homogeneous reactions
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The phase-selective solubility properties of polymer supports that could be used in thermomorphic and latent biphasic systems useful in synthesis and catalysis were evaluated using polymers tagged with either visible dyes or fluorescent probes. Heptane/DMF, heptane/90% ethanol-water, heptane/ethyl acetate, heptane/ethanol, and heptane/tert-butyl alcohol solvent mixtures were all studied as examples of thermomorphic or latent biphasic systems. A range of polymers including polyisobutylene (PIB), poly(tert-butylstyrene) (PTBS), poly(octadecyl acrylate) (PODA), and poly(octadecyl methacrylate) (PODMA) were tested for hydrophobic phase-selective solubility. The results of these studies are compared to prior work with polar and nonpolar poly(N-alkylacrylamide)s and polystyrene. Together with this prior work, these results show that a wide range of polymers and solvent mixtures can be used for the recycling of soluble polymer-bound catalysts, reagents, and sequestrants using either thermomorphic or latent biphasic separation strategies.
- Bergbreiter, David E.,Sung, Shayna D.,Li, Jun,Ortiz, Denisse,Hamilton, Patrick N.
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p. 461 - 468
(2013/09/05)
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- Preparation of preparing substituted indanones
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a process for the preparation of indanones of the formula II from, indanones of the formula I or of indanones of the formula IIa from indanones of the formula Ia comprises reacting an indanone of the formula I or Ia with a coupling component.
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- Disinfectant polymeric coatings for hard surfaces
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Liquid disinfectant compositions are disclosed which can be used to surface-coat substrates with polymeric films which are adherent, water-resistant and which can impart prolonged germicidal properties to the treated surfaces.
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- Azo monomer useful in polymerization systems
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An unsymmetrical azo monomer contains t-alkyl, t-cycloalkyl, or t-aralkyl moiety and one polymerizable double bond. This compound is useful in polymerization and crosslinking systems.
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