- Method for preparing glue and medical glue
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The present invention provides a method for preparing an acrylate based adhesive in high purity, which performs a process of producing an alkyl cyanoacrylate polymer from alkyl cyanoacetate and a process of depolymerizing the alkyl cyanoacrylate polymer into monomers together to reduce the production costs.(AA) Mix alkyl alcohol with an organic solvent(BB) Add cyanoacetic acid and strong acid to the mixed solution and heating the same for esterification(CC) Remove water produced during the esterification reaction by azeotropic distillation and purify/dry the mixture(DD) Stir alkyl cyanoacetate, a crosslinking agent, and a catalyst to prepare a polymer(EE) Prepare a crude polymer from the polymer(FF) Perform catalytic depolymerization of the crude polymer to obtain a monomer-type high purity polymerCOPYRIGHT KIPO 2018
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Paragraph 0082-0085; 0107; 0108
(2018/06/26)
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- Process for preparing 1,1-disubstituted ethylenic monomers
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The present invention relates to a process for preparing 1,1-disubstituted ethylene monomers having general formula (I) from a compound of general formula (II) and an active methylene compound of general formula (III) using a catalytic amount of an ammonium or iminium salt in homogeneous phase or supported on a solid substrate. Said process allows the direct synthesis of the monomers and finds application in the preparation of a wide variety of monomers. The products obtained are reactive monomers of high purity which find application in the field of fast curing adhesives.
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Paragraph 0092; 0106
(2015/11/16)
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- RAPIDLY CURING CYANOACRYLATES AS ADHESIVES
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The present invention relates to a polymerizable adhesive composition which comprises, at least as one constituent, a cyanacrylate component and which requires a comparitively short time for curing when used on surfaces. The present invention therefore also includes a method for the production of the cyanacrylate component described above, and the cyanacrylate component as such.
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Page/Page column 9
(2010/03/02)
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- IMINIUM SALTS AND METHODS OF PREPARING ELECTRON DEFICIENT OLEFINS USING SUCH NOVEL IMINIUM SALTS
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This invention relates to novel iminium salts, which may be in the form of ionic liquids, and a process for producing electron deficient olefins, such as 2-cyanoacrylates, using such an iminium salt, for instance in the form of an ionic liquid.
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Page/Page column 35
(2008/12/05)
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- Method for producing a cyanoacrylate monomer
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A method for producing a cyanoacrylate monomer, comprising the steps of (a) reacting cyanoacetate and formaldehyde or paraformaldehyde in the presence of a base or amine base catalyst to form an α-cyanoacrylate prepolymer or oligomer mixture; (b) subjecting the α-cyanoacrylate prepolymer or oligomer mixture to a substrate having free acid, acid derivative, or free aldehyde or ketone groups to remove the catalyst and to obtain a purified α-cyanoacrylate prepolymer or oligomer; and (c) subjecting the purified α-cyanoacrylate prepolymer or oligomer to depolymerization to obtain an α-cyanoacrylate monomer.
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Page/Page column 4
(2010/11/28)
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- Synthesis of cyanoacrylate esters by oxidation of aromatic selenyl cyanopropionates
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A method of preparing an α-cyanoacrylate ester of a desired alcohol includes the steps of preparing a compound which is an α-selenoaryl-α-cyanopropionate ester of the desired alcohol, oxidizing said α-selenoaryl-α-cyanopropionate ester to the corresponding selenoxide, eliminating arylselenic acid from the selenoxide to produce said α-cyanoacrylate ester, and separating said α-cyanoacrylate ester from the selenic acid. At temperatures of about 0° C. or higher, the elimination step occurs concurrently with the oxidizing step using a peroxide or ozone oxidizing agent. The desired cyanoacrylate ester is obtained in good yield and very high purity. The method can be used to prepare difficult to synthesize plural functional cyanoacrylate monomers and mono- cyanoacrylate monomers regardless of alcohol chain length.
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