23432-62-4Relevant academic research and scientific papers
The isocyanate group-containing alkoxysilane method (by machine translation)
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Paragraph 0102-0106, (2020/10/03)
[Problem] an isocyanate group-containing alkoxysilane isocyanate group-containing alkoxysilane having high purity can be efficiently produced. [Solution] The amino group-containing alkoxysilane is reacted with dialkyl carbonate, carbamate alcohol mixture is obtained. Then, the mixture was heated to obtain an isocyanate group-containing alkoxysilanes. In this case, alcohol-containing fractions of 1 second, isocyanate group-containing alkoxysilane containing 2 fractions of a second, annular byproducts including 3 a fraction is obtained. The, the first fraction of the heated mixture before mixing 3, annular reaction byproduct alcohol, cyclic carbamate returned products. Figure 1 [drawing] (by machine translation)
Preparation method of methyl 3-trimethoxysilane carbamate
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Paragraph 0009-0010; 0026-0044, (2020/10/14)
The invention discloses a preparation method of methyl 3-trimethoxysilane carbamate. The preparation method comprises the following steps: S1, reaction process; sequentially adding raw materials including aminosilane, dimethyl carbonate (DMC) and a catalyst into a reactor, wherein the molar ratio of aminosilane to dimethyl carbonate is (2:1) - (4:1), introducing nitrogen into the reactor to replace and discharge air, heating the reaction system to 90-115 DEG C under a stirring condition, and reacting for 15-20 hours under a micro-vacuum or normal-pressure condition to obtain a crude product; and S2, a post-treatment process: adding a proper amount of acid into the reaction system for neutralization, vacuumizing the reactor after the neutralization is finished, heating the reactor to 80-100DEG C for removing residual methanol and unreacted dimethyl carbonate, continuously heating the reactor to 160-180 DEG C, and distilling the reaction product to obtain a methyl 3-trimethoxysilane carbamate product. The selected reaction raw materials are wide and easy to obtain, the quality is controllable, the raw materials are low-toxicity chemicals, and use of high-toxicity, highly-toxic, flammable and combustible chemicals is avoided.
PROCESS FOR PREPARING ISOCYANATES CONTAINING ALKOXYSILANE GROUPS
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Paragraph 0068-0071, (2019/10/17)
The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) haloalkylalkoxysilane is reacted with metal cyanate and alcohol to give alkoxysilanoalkylurethane, B) alkoxysilanoalkylurethane is freed of low boilers, solids, salt burdens and/or high boilers and optionally purified, C) alkoxysilanoalkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from cleavage bottoms material and collected, wherein the process regime at least of steps C) to D) is continuous.
PROCESS FOR PREPARING ISOCYANATES CONTAINING ALKOXYSILANE GROUPS
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Paragraph 0086-0088, (2019/10/23)
The present invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilanoalkylamine is reacted with urea in the presence of an alcohol, optionally in the presence of at least one catalyst, to give alkoxysilanoalkylurethane, B) simultaneously or successively, if used, the catalyst is removed and/or deactivated, and low boilers, medium boilers and/or high boilers are removed, C) purified alkoxysilanoalkylurethane is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, in which, in step C), i) the bottoms material is wholly or partly discharged from the cleavage apparatus,ii) subjected to thermal treatment and/or purification and/or an aftertreatment in the presence of alcohol andiii) the material removed, after thermal treatment and/or purification and/or aftertreatment in step B) or C), is fed in again.
PROCESS FOR PREPARING ISOCYANATES CONTAINING ALKOXYSILANE GROUPS
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Paragraph 0087; 0088; 0089; 0090; 0091; 0092; 0093, (2019/10/17)
The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilano(cyclo)alkylamine is reacted with dialkyl carbonate in the presence of a basic catalyst to give alkoxysilano(cyclo)alkylurethane,B) simultaneously or successively, the catalyst is deactivated, and low boilers, solids, salt burdens and/or high boilers are removed,C) alkoxysilano(cyclo)alkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, andD) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, pa wherein the process regime at least of steps C) to D) is continuous.
PROCESS FOR PREPARING ISOCYANATES CONTAINING ALKOXYSILANE GROUPS
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Paragraph 0099-0103, (2019/10/23)
The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilano(cyclo)alkylamine is reacted with dialkyl carbonate in the presence of a basic catalyst to give alkoxysilano(cyclo)alkylurethane,B) simultaneously or successively, the catalyst is removed and/or deactivated, and low boilers, solids, salt burdens and/or high boilers are removed,C) alkoxysilano(cyclo)alkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, andD) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, wherein the basic catalyst is a guanidine base.
PRODUCTION OF ISOCYANATE FUNCTIONAL ORGANOSILANES
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Paragraph 0067-0071, (2017/11/30)
Isocyanate-functional silanes are prepared in high yield by pyrolysis of an O-carbamate prepared by reaction of a dialkylcarbonate with an aminoalkyl-functional silane in the presence of a basic catalyst, where the catalyst is neutralized by an acid which has a pKa of all protolysis stages of not more than 4. The neutralized or partially neutralized catalyst need not be removed prior to pyrolysis. The isocyanato-functional silanes exhibit higher storage stability as compared to those prepared from O-carbamates where catalyst neutralization is effected by weak acids.
MANUFACTURING METHOD OF CARBAMATE ALKYLSILANE
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Paragraph 0042, (2018/03/23)
PROBLEM TO BE SOLVED: To provide a manufacturing method capable of providing carbamate alkylsilane effectively from a reaction mixture obtained from a reaction of aminoalkylsilane and a carbonic ester compound at high purity and high yield. SOLUTION: There is provided a manufacturing method of carbamate alkylsilane of the formula (3) by distilling a reaction mixture obtained by reacting an organic silicate compound represented by the formula (1) and a carbonic ester compound represented by the formula (2) in a presence of a metal catalyst containing one or more kinds of metal selected from Mn and Zn. R1 is a substituted/unsubstituted bifunctional hydrocarbon group with 3 to 6 carbon atoms, R2 and R3 are each independently a substituted/unsubstituted C1 to 10 monovalent hydrocarbon group and n is an integer of 0 to 2. R4 is each independently a substituted/unsubstituted C1 to 10 monovalent hydrocarbon group. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
METHOD FOR PRODUCING CARBAMATOORGANOSILANES
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Paragraph 0058; 0059; 0060; 0061; 0062; 0063, (2016/08/17)
Carbamatoorganosilanes are produced in exceptionally high yield with a high degree of purity, by reacting an aminoorganosilane with a dialkylcarbonate in the presence of a basic catalyst, wherein a first reaction period proceeds at a temperature in the range of 35-65° C., followed by a later reaction period at a temperature at least 10° C. higher. A low level of catalyst allows its removal by simple exit filtration, without a separate filtration step.
Heterobimetallic dinuclear lanthanide alkoxide complexes as acid-base bifunctional catalysts for synthesis of carbamates under solvent-free conditions
Zeng, Ruijie,Bao, Linquan,Sheng, Hongting,Sun, Lili,Chen, Man,Feng, Yan,Zhu, Manzhou
, p. 78576 - 78584 (2016/09/09)
Heterobimetallic dinuclear lanthanide alkoxide complexes Ln2Na8(OCH2CH2NMe2)12(OH)2 [Ln: I (Nd), II (Sm), III (Yb) and IV (Y)] were used as efficient acid-base bifunctional catalysts for the synthesis of carbamates from dialkyl carbonates and amines as well as the N-Boc protection of amines. The cooperative catalysts showed high catalytic activity and a wide scope of substrates with good to excellent yields under solvent-free conditions. The systems have shown higher catalytic activities due to the noteworthy synergistic interactions of Lewis acid center-Br?nsted basic center. The comparison of catalytic efficiency between mono- and dinuclear heterobimetallic lanthanide alkoxide analogues was also investigated.
