摘要:
The present invention provides a protolytically leaving group-containing copolymer having improved characteristics such as increased solubility in alkaline aqueous solution in the presence of a proton, thus finding application with advantage in various uses, and a process for producing the copolymer. A protolytically leaving group-containing copolymer represented by the following general formula (1): in the formula, R1, R2 and R3 are the same or different and each represents a protolytically leaving group and a, b and c represent the amounts of existence (mole %) of repeating units (A), (B) and (C), respectively, in the copolymer, which comprises the repeating unit (A) as well as the repeating unit (B) and/or the repeating unit (C) and has a weight average molecular weight of 2000˜30000, said a, b and c satisfying the condition that a is 5 to 30 mole % and (b+c) is 70 to 95 mole %.
摘要:
Color-stabilized basic monomers are provided. Said basic monomers are obtained by adding, to a basic monomer �e.g. an N,N-dialkylaminoalkyl (meth)acrylate or an N,N-dialkylaminoalkyl (meth)acrylamide!, at least one member selected from the group consisting of amido group-containing compounds, phosphorous acid esters, phosphoric acid esters and phosphines and at least one phenol compound represented by the general formula: ##STR1## wherein R.sup.5, R.sup.6, R.sup.8 and R.sup.9 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and R.sup.7 is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms. The color-stabilized basic monomers are more resistant to coloration when they are handled under such conditions that the oxygen concentration in the gas phase contacting therewith is 0.01 to 10% by volume.
摘要:
In the operation of producing an alkylamino(meth)acrylate by the reaction of transesterification of an alkyl(meth)acrylate with an alkylamino alcohol, the alkyl alcohol by-produced during the transesterification is distilled in the form of an azeotropic mixture with the alkyl(meth)acrylate, the resultant distillate is purified with an ion-exchange resin and handled, on the other hand, the reaction solution is distilled to allow separation of the catalyst wherein is provided a method and apparatus for effecting, in the production of the alkylamino(meth)acrylate, the distillation under such a condition as represses the amount of in crease of the Michael adduct below 2%.
摘要:
A novel acrylic ester which is represented by general formula (2) ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom or an organic residue, R.sub.3 represents an organic residue, n is a positive number among 1 to 3, and m is a positive number among 1 to 100 and which is applicable to various uses, is obtained by reacting an acrylic ester of general formula (3) ##STR2## wherein R.sub.1 represents a hydrogen atom or an organic residue, and R.sub.3 represents an organic residue, with a cyclic ether compound of general formula (4) ##STR3## wherein R.sub.2 represents a hydrogen atom or an organic residue, and n is a positive number among 1 to 3. Moreover, a novel acrylic acid derivative whose use is even wider is obtained by hydrolyzing the acrylic acid derivative.
摘要:
To provide a production method of a (poly)alkylene glycol chain-containing polymer which can be preferably used in various applications such as an admixture for cement and which can exhibit extremely high dispersibility to a cement composition. The unsaturated (poly)alkylene glycol ether monomer of the present invention is an unsaturated (poly)alkylene glycol ether monomer production method for producing an unsaturated (poly)alkylene glycol ether monomer by addition reaction of an alkylene oxide on an unsaturated alcohol, wherein the production method includes a step of carrying out addition reaction under condition of existence of 0.01 to 25 parts by mass of an unsaturated (poly)alkylene glycol diether monomer to 100 parts by mass of the unsaturated alcohol, and a (poly)alkylene glycol chain-containing polymer production method, wherein a monomer component including an unsaturated (poly)alkylene glycol ether monomer produced by the production method.
摘要:
The present invention provides methods for producing human ceramide in a yeast cell.The methods of the present invention comprise: 1) introducing the sphingoid Δ4-desaturase gene (DES1) by transformation of the yeast cell; and 2) abolishing the expression of the yeast sphinganine C4-hydroxylase gene (SUR2) by transformation of the yeast cell.
摘要:
The lactone ring-containing polymer of the present invention meets the following conditions that: (1) the content of polymer gels of 50 μm or greater in average particle diameter is lower than or equal to 100 pieces/100 g, and the weight average molecular weight of the polymer is 50,000 to 170,000; and/or (2) an increasing rate of viscosity after heated at 280° C. for 30 minutes is 2.0 times or smaller. The lactone ring-containing polymer of the present invention contains very few foreign matters and does not easily cause gelation, in addition to being excellent in transparency and heat resistance as well as having the desired properties such as mechanical strength and forming and processing properties. The forming material obtained by heating and granulating such a polymer are suitable for use in, for example, optical components such as light guide materials, optical lenses, and optical films.
摘要:
A process for preparing an absorbent resin includes the steps of: preparing a first crosslinking agent (A) including at least two polymerizable unsaturated bonds; preparing a second crosslinking agent (B) including at least two polymerizable unsaturated bonds and hydroxyl groups; preparing a crosslinking agent including (A) and (B) with a ratio of (A) to (B) ranging from 95/5 to 50/50; and polymerizing a hydrophilic unsaturated monomer having at least one carboxyl group using the crosslinking agent. The crosslinking agent includes a crosslinking agent which includes a main component at least 90 percent by weight, the main component being an ester having at least two polymerizable unsaturated bonds, wherein the ester is composed of a polyhydroxy alcohol (C) having not more than six carbon atoms and at least three hydroxy groups, and an unsaturated carboxylic acid (D); and a molecular weight ratio of the main component to a standard compound (E) is in the range of from 0.7/1 to less than 1.3/1, (E) being an ester composed of (C) that composes the main component, and (D) that composes the main component, in which all the hydroxy groups in (C) are ester-linked with (D).
摘要:
To provide a production method of a (poly)alkylene glycol chain-containing polymer which can be preferably used in various applications such as an admixture for cement and which can exhibit extremely high dispersibility to a cement composition. The unsaturated (poly)alkylene glycol ether monomer of the present invention is an unsaturated (poly)alkylene glycol ether monomer production method for producing an unsaturated (poly)alkylene glycol ether monomer by addition reaction of an alkylene oxide on an unsaturated alcohol, wherein the production method includes a step of carrying out addition reaction under condition of existence of 0.01 to 25 parts by mass of an unsaturated (poly)alkylene glycol diether monomer to 100 parts by mass of the unsaturated alcohol, and a (poly)alkylene glycol chain-containing polymer production method, wherein a monomer component including an unsaturated (poly)alkylene glycol ether monomer produced by the production method.
摘要:
The storage of alkylaminoalkyl (meth)acrylate is made in a container made of stainless steel whose wall surface has not more than 1.6 &mgr;m for the Ra defined in JIS B 0601. And the compound is stored in a container having a water concentration of not more than 0.1 vol. % and a molecular oxygen concentration exceeding 0 to 10 vol. % in the gas phase part of the container. When the compound is handled under these conditions, it is enabled to retain the (meth)acrylic acid concentration therein below 0.1 wt. %, prevented from producing a polymer or a precipitate, and precluded from coloration.
摘要翻译:(甲基)丙烯酸烷基氨基烷基酯的储存在JIS B 0601中定义的Ra的壁面不超过1.6μm的不锈钢容器中制备。将化合物储存在水分浓度不大的容器中 大于0.1体积 %,分子氧浓度超过0〜10体积%。 容器的气相部分的%。当化合物在这些条件下处理时,能够将其中的(甲基)丙烯酸浓度保持在0.1重量%以下。 %,防止产生聚合物或沉淀,并防止着色。