67 results about "Diglycolic acid" patented technology

A method for preventing adhesion using a co-polyester comprising the reaction product of a polycondensation polyester and at least one lactone, wherein the polycondensation polyester comprises the reaction product of diglycolic acid and / or a derivative thereof and ethylene glycol; and the co-polyester comprises about 40 to 50% by weight of the polycondensation polyester based on the total weight of the co-polyester.

A glycolic acid copolymer comprising (a) 80 to less than 95% by mole of glycolic acid monomer units, (b) 5.0 to 20.0% by mole of non-glycolic, hydroxycarboxylic acid monomer units, and (c) 0 to 0.10% by mole of diglycolic acid monomer units, the non-glycolic, hydroxycarboxylic acid monomer units (b) constituting a plurality of segments each independently consisting of at least one monomer unit (b), wherein the segments have an average chain length of from 1.00 to 1.50 in terms of the average number of monomer unit or units (b), the total of the components (a), (b) and (c) being 100% by mole, the glycolic acid copolymer having a weight average molecular weight of 50,000 or more.

Solvent extraction from an aqueous phase containing first and second rare earth elements is carried out by contacting an organic phase containing a diglycolamic acid as an extractant and a hydrocarbon or a low-polar alcohol as a solvent, with the aqueous phase below pH 3 for extracting the first rare earth element into the organic phase, back-extracting from the organic phase with an aqueous acid solution for recovering the first rare earth element, and recovering the second rare earth element which has not been extracted into the organic phase and has remained in the aqueous phase.

A semi-crystalline, absorbable copolyester composition comprising the reaction product of a polycondensation polyester and at least one lactone, wherein the polycondensation polyester comprises the reaction product of diglycolic acid and / or a derivative thereof and diethylene glycol; and the copolyester comprises about 30 to 50% by weight of the polycondensation polyester based on the total weight of the copolyester.

A co-polyester which includes the reaction product of a polycondensation polyester and epsilon-caprolactone, wherein the polycondensation polyester comprises the reaction product of diglycolic acid and / or a derivative thereof and a diol. The co-polyester is injectable and absorbable into animal, such as human, tissue and can be used for facial cosmetic or reconstructive surgery of soft tissue. Another embodiment is directed to a method for preventing adhesion using a co-polyester comprising the reaction product of a polycondensation polyester and epsilon-caprolactone, wherein the polycondensation polyester comprises the reaction product of diglycolic acid and / or a derivative thereof and a diol, and the co-polyester comprises about 40 to 50% by weight of the polycondensation polyester based on the total weight of the co-polyester.

A semi-crystalline, absorbable copolyester composition comprising the reaction product of a polycondensation polyester and at least one lactone, wherein the polycondensation polyester comprises the reaction product of diglycolic acid and / or a derivative thereof and diethylene glycol; and the copolyester comprises about 30 to 60% by weight of the polycondensation polyester based on the total weight of the copolyester. Also medical devices such as absorbable sutures comprising such copolyesters and absorbable microspheres comprising such copolyesters and methods of making of such absorbable microspheres. Additionally, a method of melt blowing an absorbable copolyester composition and a nonwoven construct are disclosed.

The invention belongs to the technical field of inorganic materials and bioanalysis and in particular relates to an aminophenylboronic acid surface-modified nano-carbon material, as well as a preparation method and application thereof. According to the invention, an available nano-carbon material is subjected to carbodiimide reaction on the basis of acid treatment. Firstly, the surface of the nano-carbon material is modified by polylysine and polyethylene glycol / diglycolic acid, then the nano-carbon material reacts with aminophenylboronic acid for surface functional modification of the nano-carbon material. The synthesis method provided by the invention is simple and efficient. The prepared aminophenylboronic acid-functionalized nano-carbon material, as a nano-adsorbent, has a large specific surface area and strong selective specificity, exhibits better dispersibility and stability in aqueous solutions, and can rapidly achieve the effect of specifically separating and concentrating glycopeptide / glycoprotein. The material is significant in use value and application prospects in the glycoprotein proteomics field and the like.

A semi-crystalline, absorbable copolyester composition comprising the reaction product of a polycondensation polyester and at least one lactone, wherein the polycondensation polyester comprises the reaction product of diglycolic acid and / or a derivative thereof and diethylene glycol; and the copolyester comprises about 30 to 60% by weight of the polycondensation polyester based on the total weight of the copolyester. Also medical devices such as absorbable sutures comprising such copolyesters and absorbable microspheres comprising such copolyesters and methods of making of such absorbable microspheres.

The invention discloses a novel method for synthesizing a diamide compound (R1R2NCO) 2CH2OCH2, which comprises the following steps of: with a hydrogen chloride gas as a catalytic agent, catalyzing diglycolic acid and methanol to prepare diglycolic acid dimethyl ester; and reacting the diglycolic acid dimethyl ester with amine to produce the corresponding 3-oxa-pentanediamide. Reaction conditions are mild, and operation steps are simple because of omitting the preparation of acyl chloride; the prepared ester can be stored for long, which is convenient for increasing production efficiency; environment pollution is lower without exhausting a large quantity of sulfur dioxide or hydrogen chloride gas.

The present disclosure provides a surfactant formulation for use in treating and recovering fossil fluid from a subterranean formation. The surfactant formulation includes a nonionic surfactant, organic acid selected from citric acid, diglycolic acid, glycolic acid and a salt thereof and injection water. The surfactant formulation may be injected into one or more injection wells located within the subterranean formation and fossil fluids can then be subsequently recovered from one or more producing wells

Glycolide production through depolymerization of glycolic acid oligomer is stabilized by controlling impurities in the glycolic acid oligomer to allow economical and effective production of glycolide. More specifically, the depolymerization system is controlled to suppress an effective concentration (x+100y wt. %) of depolymerization-obstructing substances calculated as a total of a concentration calculated as diglycolic acid (of x wt. %) of hydroxyl group-free impurity carboxylic acids (A) and 100 times a concentration calculated as ammonia (of y wt. %) of nitrogen-containing substances (B), respectively with respect to the starting glycolic acid oligomer in the depolymerization system, to at most 15 wt. %.

The invention relates to a method for preparing macromolecule micro filter film with phase shift method and relative holing agent. Wherein, it uses the multicomponent macromolecule homogeneous phase system of diglycolic acid maleate as the casting film solution; uses the polymer deposit (dry-wet method) method emerged into non-solvent bath to prepare the micro filter film, while the dry method costs 2mins; the micro filter film has symmetry holes, high strength and insensitivity on temperature and humidity vibration. The aperture of micro filter film is 0.1-0.80micrometer, the water osmosis is 5-150ml / cm2.min (0.1MPa), the whole rate is 70-85%. The invention has wide application.

A bonding material of a silver paste includes: fine silver particles having an average primary particle diameter of 1 to 50 nanometers, each of the fine silver particles being coated with an organic compound having a carbon number of not greater than 8, such as hexanoic acid; silver particles having an average primary particle diameter of 0.5 to 4 micrometers, each of the silver particles being coated with an organic compound, such as oleic acid; a solvent containing 3 to 7% by weight of an alcohol and 0.3 to 1% by weight of a triol; a dispersant containing 0.5 to 2% by weight of an acid dispersant and 0.01 to 0.1% by weight of phosphate ester dispersant; and 0.01 to 0.1% by weight of a sintering aid, such as diglycolic acid, wherein the content of the fine silver particles is in the range of from 5% by weight to 30% by weight, and the content of the silver particles is in the range of from 60% by weight to 90% by weight, the content of the total of the fine silver particles and the silver particles being not less than 90% by weight.

The invention belongs to the technical field of powder coating, particularly relates to high-leveling polyester resin, and further discloses a preparation method of the high-leveling polyester resin and application of the high-leveling polyester resin to preparation of HAA system powder coating. The high-leveling polyester resin provided by the invention is formed through copolymerization of diethyl phenyl malonate, a citrate monoester compound, diglycolic acid, thiodiglycol, octyl glycerol, neopentyl glycol and hexahydrophthalic anhydride. The high-leveling polyester resin, has a soft chain segment, high molten state flowability and low high-temperature viscosity, and can be applied to preparation of HAA curing system powder coating.

An adsorbent for rare earth element and a method for recovering a rare earth element, in which a rare earth element contained in an aqueous solution can be simply and inexpensively adsorbed and recovered, and a rare earth element present in an aqueous solution in combination with a base metal can be selectively adsorbed and recovered. The adsorbent includes a base material and diglycolamic acid introduced into the base material. The method for recovering a rare earth element includes steps of: bringing an aqueous solution containing a rare earth element into contact with the adsorbent for rare earth element to allow the rare earth element to be adsorbed on the adsorbent for rare earth element; and desorbing the rare earth element adsorbed on the adsorbent for rare earth element with an acid of 1 N or less.

A rare earth metal extractant containing, as the extractant component, dialkyldiglycol amide acid which is excellent in breaking down light rare earth elements is reacted in diglycolic acid (X mol) and an esterification agent (Y mol) at a reaction temperature of 70° C. or more and for a reaction time of one hour or more such that the mol ratio of Y / X is 2.5 or more, and is subjected to vacuum concentration. Subsequently, a reaction intermediate product is obtained by removing unreacted products and reaction residue. Then a nonpolar or low-polar solvent which is an organic solvent for forming an organic phase during solvent extraction of the rare earth metal and which is capable of dissolving dialkyldiglycol amide acid is added as the reaction solvent, and the reaction intermediate product is reacted with dialkyl amine (Z mol) such that the mol ratio of Z / X is 0.9 or more.

The invention discloses a synthesis method of 3,4-ethylenedioxythiophene (EDOT) as a novel conductive high polymer monomer. The synthesis method comprises the following steps of: taking chloracetate as a starting material; carrying out a vulcanization reaction to obtain sulfo-diglycolic acid ester, and then carrying out a one-pot reaction of condensation, etherification, saponification and acidification to prepare 3,4-ethylenedioxythiophene-2,5-dicarboxylic acid; and then carrying out a decarboxylic reaction to obtain the 3,4-ethylenedioxythiophene. The synthesis method has the advantages of low price of raw materials, moderate reaction conditions, simplicity and convenience in operations, short production period and high product quality.

A water-based ink for ink jet recording, contains: a coloring agent; water; and a water-soluble organic solvent. The coloring agent contains a phosphate group-modified self-dispersing pigment. The water-based ink further contains at least one selected from the group consisting of boric acid, diglycolic acid, and a chelating agent.

The present invention describes a novel process for the preparation of levocetirizine and pharmaceutically acceptable acid addition salts thereof using diglycolic acid or derivatives thereof and new intermediates used in that process.

A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in a synthesis medium. A molar ratio (B / A) of dialkylamine (B) to diglycolic anhydride (A) is at least 1.0. A non-polar or low-polar solvent in which the dialkyl diglycol amic acid is dissolvable is used as the synthesis medium.