34results about "Esters preparation by oligomerisation" patented technology

Mixtures of water immiscible components and water dispersible components, in combination with an optional coemulsifier and an optional coupling agent, provide synthetic (water based) emulsions that have enhanced lubricity, provide excellent cooling characteristics, are low foaming and biostable and can be made effectively transparent.

The present invention related to compositions and methods of producing polyesters with two and / or more different structural units and the materials of polyesters with structure sequence exactly specified therefore produced, and various articles produced from such exactly sequenced polyesters. More particularly, homogeneous copolymers with precisely defined sequences of various hydroxyl acids and their derivatives are produced according to the present invention.

A method comprising the steps of providing a fatty acyl mixture comprising: (i) a C10-C16 acyl carbon atom chain content of at least 30 wt. % wherein at least 80% of the C10-C16 acyl carbon atom chains are saturated; and (ii) a C18-C22 acyl carbon atom chain content of at least 20 wt. % wherein at least 50% of the acyl C16-C22 carbon atom chains contain at least one double bond; hydrolyzing at least some of the mixture to yield a quantity of C10-C16 saturated fatty acids and C18-C22 unsaturated fatty acids; oligomerizing at least some of the C18-C22 unsaturated fatty acids to yield a quantity of C36+ fatty acid oligomers; separating at least some of the C10-C16 saturated fatty acids from the C36+ fatty acid oligomers.

The invention provides a method to produce bio-diesel and dimerized acid ester from combination of animal and plant lipids. Esterification is performed between animal / plant lipids and a lower alcohol containing 1-4 carbons, the product of esterification is separated into saturated and un-saturated lipid acids through urea inclusion. The condition of urea inclusion includes the ratio of lipid acidesters: urea: solvent (w / w / w) is 1: (0.6-4): (2-10), with the temperature of 0-25 DEG C and the time of 5-30 hours. The unsaturated lipid acids react for 1-12 hours under 150-300 DEG C with the presence of an acid catalyst, and the product undergoes vacuum distillation to obtain monomer lipid acid ester and dimerized acid ester. The combination of the monomer lipid ester and the saturated lipid acid ester obtained through urea inclusion is the bio-diesel. The invention increases the reaction speed, shortens the reaction time, and improves the quality of the product of dimerized lipid acid ester, because a great deal of saturated lipid acid ester does not participate in the polymerization reaction.

The present invention relates to a macromolecule for delivering protein, polypeptide or peptide drugs and to a production method for the same, as well as to a slow release composition for protein, polypeptide or peptide drugs comprising the same, and more specifically relates to a polylactic acid derivative compound of Chemical formula 1 of which the numerical average molecular weight is no more than 7000 daltons and to a production method for the same, as well as to a slow release composition for protein, polypeptide or peptide drugs using the same and to a production method for the same.

A process to prepare a (iv) cyclic polyester oligomer composition comprising a cyclic polyester oligomer having furanic units and two to five repeat units is disclosed. The process comprises the stepsof: (a) reacting a monomer composition comprising: (i) a bifunctional furan-derivative and (ii) a diol in an linear oligomerization step to produce a (iii) linear oligomer composition comprising a linear oligomer species, (b) reacting the (iii) linear oligomer composition in a distillation-assisted cyclization (DA-C) step to form a (iv) cyclic polyester oligomer composition and a (v) diol byproduct, wherein the (v) diol byproduct is removed by evaporation in the distillation-assisted cyclization (DA-C) step.

The present invention relates to a method of manufacturing norbixin or bixin ethyl ester, which is a carotenoid-based compound, from a novel intermediate compound. When the novel intermediate compound is used, it is possible to manufacture norbixin or bixin ethyl ester in high yield through a simple process.

The invention relates to a preparation method of hydroxyl-terminated polyacrylate oligomers, which comprises the following steps: preparing low molecular weight polyacrylate oligomers with controllable molecular weight, such as polybutylacrylate, polyethylacrylate, oly(isooctyl acrylate), polymethyl methacrylate, a block copolymer of butyl acrylate and methyl methacrylate, a block copolymer of themethyl methacrylate and dimethylaminoethyl methacrylate, and the like by adopting atom transfer radical polymerization (ATRP) and using organic halide as an initiating agent; and then carrying out terminal group modification on the polymers by N-methylethanolamine to obtain the hydroxyl-terminated polyacrylate oligomers with controllable molecular weight. The prepared hydroxyl-terminated polyacrylate oligomers can be used for the production of polyurethane. Because the molecular weight of the hydroxyl-terminated polyacrylate oligomers is controllable, a polyurethane material with special performance can be prepared.

Compounds and compositions useful for reducing the risk of infection are disclosed herein. In particular, disclosed herein are mandelic acid condensation polymers, compositions comprising the compounds, processes for making the compounds, and methods of using the compounds.

A novel flaky catalyst for synthesizing a dimmer acid ester consists of activated clay, a promoter and an adhesive pore-forming agent, wherein the activated clay accounts for 65-85 percent, the promoter accounts for 2-10 percent, and the adhesive pore-forming agent accounts for 13-25 percent. The preparation method for the catalyst comprises the following steps of: preparing the powder of the activated clay with a particle size of 150-250 meshes; mixing the raw materials evenly according to the partition ratio; tabletting and forming; drying the mixture at 105 DEG C; calcining the mixture at 300-400 DEG C; and cooling down and packaging the mixture. The method is simple and feasible. The catalyst which has good activity and high strength is easy to be separated from products with less products carried. In addition, the catalyst is easy to be regenerated.

The invention discloses a synthetic method of a brush type homopolymer and a brush type copolymer containing conjugate oligomeric branched chains. In the synthesis process of a novel monomer, a metal catalysis coupling reaction and an esterification reaction are adopted, so that conjugate alkene monomers such as oligo-containing polyfluorene, oligomeric benzene, oligomeric benzyne, oligomeric carbazole, oligomeric thiophene and the like are synthesized; and a way for grafting and grafting to is adopted, and radical polymerization (including atom transfer radical polymerization) are performed, so that a series of brush type homopolymers and copolymers with conjugate branched chains are obtained, homopolymerization, binary irregular copolymerization and block copolymerization, and ternary irregular copolymerization and block copolymerization of a monomer containing a conjugate branched chain are realized, and special brush type homopolymers and brush type copolymers are obtained. The synthetic method disclosed by the invention is simple, convenient and practicable; a synthesized brush type polymer has a controllable structure; and a three-dimensional structural design of a large molecular strain is realized, and combination of a conjugate structure and a brush type structure is realized, so that a polymer with excellent comprehensive performance is obtained.

The present invention provides a modified acrylic oligomer comprising polymerized units derived from: (1) acrylic monomers; (2) selected from the group consisting of fluorinated acrylic monomers, siloxane monomers, monomers of the group consisting of monomers and mixtures thereof; and (3) optionally, tertiary carboxylate monomers; wherein the oligomer also comprises monomers derived from epoxy (meth)acrylates, aminomethyl A group of modifiers consisting of ester acrylate, polyester acrylate, 2-hydroxyethyl (meth)acrylate and mixtures thereof. The present invention further provides an antifouling paint comprising the above-mentioned modified acrylic oligomer.

The present invention is a method for producing a polysubstituted biphenyl compound represented by the following general formula (2), which comprises making the substituted benzene represented by the following general formula (1) Steps for compound coupling.