摘要:
The invention relates to special (methyl)acrylaic monomers and concerns more particularly an enhanced process for preparing solutions of alkylimiozolidone (meth)acrylates in water solutions of alkylimidazolidone (meth)acrylates in a light (meth)acrylate.
摘要:
To obtain a compound of formula (I), an anhydride (II) is reacted with a heterocyclic alcohol (III). After the reaction, the excess (meth)acrylic anhydride can be hydrolysed to (meth)acrylic acid by addition of water and heating between 25.degree. and 70.degree. C., preferably between 30.degree. and 50.degree. C., in order to obtain the compound (I) in solution in water and (meth)acrylic acid: ##STR1## R.sup.1 .dbd.H or CH.sub.3 ; A and B each independently represent a straight- or branched-chain C.sub.2 -C.sub.5 alkylene group.
摘要:
The invention relates to special (methyl)acrylaic monomers and concerns more particularly an enhanced process for preparing solutions of alkylimiozolidone (meth)acrylates in water solutions of alkylimidazolidone (meth)acrylates in a light (meth)acrylate.
摘要:
The invention concerns a method consisting in making a mixed (meth)acrylic anhydride of formula (I) by reacting an alkaline (meth)acrylate of formula (II) and a chloroformate of formula (III), carrying out said reaction in an aqueous medium and in the absence of amines, the mol ratio chloroformate (III)/alkaline (meth)acrylate (II) being at least equal to 1.15. R1 represents H or CH3; R2 represents an alkyl, alkenyl, aryl, alkaryl or aralkyl residue; and M is an alkaline metal.
摘要翻译:本发明涉及通过使式(II)的碱式(甲基)丙烯酸酯与式(III)的氯甲酸酯在水性介质中进行所述反应而制备式(I)的混合(甲基)丙烯酸酐的方法 在不存在胺的情况下,氯甲酸酯(III)/碱性(甲基)丙烯酸酯(II)的摩尔比至少等于1.15。 R1表示H或CH3; R 2表示烷基,烯基,芳基,烷芳基或芳烷基残基; M是碱金属。
摘要:
The present invention relates to an improved method for manufacturing (meth)acrylic anhydride by transanhydrization between (meth)acrylic acid and acetic anhydride, in the presence of air and in the presence of at least one polymerization inhibitor, characterized in that the polymerization inhibitor is chosen from the group formed from (a) metal salts of thiocarbamic or dithiocarbamic acid and their mixtures with a phenolic derivative or phenothiazine and its derivatives, and (b) N-oxyl compounds as a mixture with 2,6-di-tert-butyl-4-methylphenol taken alone or in the presence of 2,4-dimethyl-6-tert-butylphenol.
摘要:
The invention concerns a method for preparing water-soluble acrylic copolymers comprising the following steps: (i) preparing at least a monomer (1) of formula (I) wherein Ao is a —(RtO)mRz or —NRp (RtO)mRz group, by reacting a (meth)acrylic anhydride derivative (1′) of formula (II) with a compound of formula AoH, Ao being as defined above; (ii) copolymerizing said monomer (1) with at least a monomer (2) of (meth)acrylic acid or of a derivative of said acid. The invention also concerns novel water-soluble acrylic copolymers and their use as superplasticizers or dispersants for hydraulic binders such as cements.
摘要翻译:本发明涉及一种制备水溶性丙烯酸共聚物的方法,包括以下步骤:(i)至少制备式(I)的单体(1),其中Ao为 - (R tO)m R z 通过使式(II)的(甲基)丙烯酸酐衍生物(1')与式AoH的化合物反应,即如上所定义,Ao如上所定义,或-NRp(R tO)m R z基团。 (ii)使所述单体(1)至少与(甲基)丙烯酸的单体(2)或所述酸的衍生物共聚。 本发明还涉及新型水溶性丙烯酸共聚物及其用作水硬性粘合剂如水泥的超增塑剂或分散剂。
摘要:
The silanized (meth)acrylate (I) is manufactured by reacting the anhydride (II) with a silanized compound (III). This process gives a crude mixture containing compound (IV) in addition to compound (I), after which the said mixture may be freed of the lightest compounds by distillation or may be subjected to a distillation to obtain the pure compound (I). R=H or Me; R1, R2, R3=linear or branched C1-C10 alkyl, aryl or aralkyl, these radicals possibly being substituted and possibly containing hetero atoms; R4=H or a radical falling within the definition given above for R1, R2 and R3.
摘要翻译:硅烷化(甲基)丙烯酸酯(I)通过酸酐(II)与硅烷化化合物(III)反应制备。 除了化合物(I)之外,该方法还提供含有化合物(IV)的粗混合物,之后可以通过蒸馏除去最轻的化合物,或者进行蒸馏以得到纯的化合物(I)。 = H或Me; R 1,R 2,R 3 =直链或支链C 1 -C 10烷基,芳基或芳烷基,这些基团可能被取代并且可能含有杂原子; R 4 = H或上述R 1,R 2和R 3中定义的基团。
摘要:
The present invention relates to an improved method for preparing (meth)acrylic anhydride (A(M)A2O) by transanhydrification between (meth)acrylic acid and acetic anhydride in the presence of at least one polymerization inhibitor, in which reaction to the point of partial conversion of the reagents is carried out, followed by continuous distillation. With the method according to the invention, it is possible to produce I1A(M)A2O of very high purity under improved productivity conditions compared to existing methods while eliminating problems of reactor fouling.
摘要:
The subject of the invention is a method for the synthesis of (meth)acrylic esters by transesterification in the presence of a catalyst corresponding to the formula [(R′O)3Ti]xR″ in which R′ is a linear or branched alkyl radical having from 2 to 8 carbon atoms which may contain heteroatoms or R′ is a phenyl radical, R′ is a polyfunctional radical, originating from a polyol R′(OH)x comprising x alcohol functional groups and x is an integer ranging from 2 to 6. The method according to the invention is particularly well suited to the synthesis of dialkylaminoalkyl (meth)acrylates from methyl (meth)acrylate and a dialkylaminoalcohol.
摘要:
The present invention relates to an improved method for preparing (meth)acrylic anhydride (A(M)A2O) by transanhydrification between (meth)acrylic acid and acetic anhydride in the presence of at least one polymerization inhibitor, in which reaction to the point of partial conversion of the reagents is carried out, followed by continuous distillation. With the method according to the invention, it is possible to produce I1A(M)A2O of very high purity under improved productivity conditions compared to existing methods while eliminating problems of reactor fouling.