摘要:
본 발명은 R1O-Sn-OR2 (단, R1 및 R2는 각각 독립적이고, 탄소수 5 내지 30의 1차, 2차, 또는 3차 알킬기이다.)로 표현되는 유기주석 화합물, 이의 제법 및 이를 이용한 폴리락타이드의 제조 방법에 관한 것으로, 본 발명에 따른 유기주석 화합물은 그 제조가 용이하고, 이와 같은 유기주석 화합물을 사용하여 폴리락타이드를 제조하는 경우, 별도의 개시제의 사용이 없이도, 고수율로 고분자량의 폴리락타이드 수지를 제조할 수 있다.
摘要:
A moisture-curable, silane-modified oil is disclosed. The silane-modified oil includes an unsaturated oil having at least one unsaturated aliphatic hydrocarbon chain per molecule of the unsaturated oil, and at least one hydrolysable silyl group grafted to the unsaturated aliphatic hydrocarbon chain. The silane-modified oil has a degree of unsaturation that is substantially similar that of the unsaturated oil. A process for forming the moisture-curable, silane-modified oil according to the disclosure includes reacting the unsaturated oil with an unsaturated hydrolysable silane in the presence of a free radical initiator. Also disclosed is a cured silane-modified oil which includes the reaction product of the silane-modified oil and water. Compositions according to the disclosure have relatively low viscosities (facilitating their application to a substrate) and have relatively high levels of silane grafting (resulting in non-leaching cured compositions with a high gel content).
摘要:
The invention relates to a catalyst system for polyester synthesis, the catalyst system comprising at least 10 ppm of a group IV metal sulphonate and at least 50 ppm of antimony. The invention also relates to a process for polyester synthesis, to the polyester and to the articles prepared thereof.
摘要:
Isocyaiiate prepolymer catalysts and processes for rapidly curing isocyanate prepolymers are disclosed herein. Substrates coated with the isocyanate prepolymers are treated with a drying agent and water, which combine to form a hydrated catalyst complex. Co-catalysts, such as organo tins, may be used to further enhance the curing rate.
摘要:
A catalyst composition for preparing polyesters comprises a titanium compound and one or more catalyst enhancers. The titanium compound may be either a titanyl compound of the formula X m TiOY o or a titanium salt of the formula X m TiY o , where each X is independently selected from the group consisting of H, Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba and ammonium; m=0, 1 or 2; Y is a ligand of the formula C a H b O c , wherein a=1 to 30, b=0 to 60, and c=1 to 10; and o=2, 3, or 4. The catalyst enhancer may be selected from either or both of two classes: 1) compounds selected from the group consisting of oxalate and C 1-C26 carboxylate salts of Li, Na, K, Rb, Cs, Be, Ca, Mg, Sr, and Ba; and 2) compounds selected from the group consisting of soluble compounds of Al, Co, Zn, and Sn.
摘要:
Ligands characterized by being represented by the general formula (1): R R N-Q -X-Q -NR R wherein R , R , R and R are each independently a group represented by the general formula (2): (2) (wherein Q is optionally substituted alkylene, optionally substituted cycloalkylene, optionally substituted arylene, or an optionally substituted divalent heterocyclic group; R is optionally substituted alkyl, optionally substituted aryl, or an optionally substituted heterocyclic group; and R is a substituent capable of coordinating or bonding to a metal atom, or R and R may be united to form a ring); Q and Q may be the same or different from each other and each represent optionally substituted alkylene or a single bond; and X is a divalent spacer.
摘要翻译:其特征在于由通式(1)表示的配体:R 1 R 2 NQ 1 -XQ 2 -NR 3 R 4其中R 1,R 2, R 3和R 4各自独立地是由通式(2)表示的基团:(2)(其中Q 3是任选取代的亚烷基,任选取代的亚环烷基,任选取代的亚芳基或任选取代的二价 杂环基; R 5是任选取代的烷基,任选取代的芳基或任选取代的杂环基;并且R 6是能够与金属原子配位或结合的取代基,或R 5和R 6 >可以结合形成环); Q 1和Q 2可以彼此相同或不同,并且各自表示任选取代的亚烷基或单键; X为二价间隔基。
摘要:
A process for producing dialkyl carbonates, such as dimethyl carbonate, from the reaction of a primary alcohol with urea in the presence of a novel catalyst which is a complex of organotin with a high boiling electron donor compound acting as solvent which are bidentate ligands which form 1:1 bidentate and/or 1:2 monodentate adducts with R'2SnX2 (X=C1, R'O, R'COO or R'COS), R'3SnX, R'2SnO, Ph3-nR'SnXn or Ph4-nSnXn (wherein R'=CqH2q-1 n = 0, 1 or 2 and q = 2 to 12) and mixtures thereof, such as materials having the general formula RO[CH2(CH2)kCH2O]mR, wherein each R is independently selected from C1-12 alkyl, alkaryl or aralkyl moieties, k = 0, 1, 2 or 3 and m = 1, 2, 3, 4 or 5.
摘要:
The present invention relates to water soluble chiral sulfonated 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl compounds and their use as organometallic catalysts for asymmetric synthesis of optically active compounds in hydrogenation, hydroboration, hydrosilylation, hydride reduction, hydroformylation, alkylation, allylic alkylation, arylation, alkenylation, epoxidation, hydrocyanation, disilylation, cyclization and isomeration processes.
摘要:
The present invention discloses new catalytic systems based on phenolate-supported metallic complexes for the immortal ring-opening (co-)polymerisation of cyclic esters and cyclic carbonates.
摘要:
The invention relates to an emulsifiable catalyst composition which comprises at least one of metal salts, metal complexes, and acids, and at least one amphiphilic compound which is a graft copolymer based on oils or diene homo-and copolymers that bear graft branches derived from olefinically unsaturated monomers, and an average, per molecule, of at least one cationic group or cationogenic group that forms cations when contacted with an acid, to a process for its preparation, and a method of use thereof as catalyst in aqueous coating compositions.