34results about "Esters preparation by oligomerisation" patented technology

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 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.

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.