9 results about "Stabilizer for polymers" patented technology

Increasingly, plastics made from fossil raw materials such as petroleum or natural gas are being supplemented or replaced by plastics based on renewable raw materials obtained through biochemical processes. The question of sustainability then also arises for the plastic additives used for these plastics (and for plastics made from fossil raw materials). Therefore, there is a need for plastic additives based on renewable and readily available raw materials that are highly effective, low volatility, and compatible with polymeric substrates.

The invention discloses a clay stabilizer for a polymer dry powder direct distribution variable-viscosity fracturing fluid. The clay stabilizer is prepared from quaternary ammonium salt, an alcohol amine compound and a polyamine compound as raw materials in a solvent. The quaternary ammonium salt is quaternary ammonium salt with the carbon chain length of C12-C18; the alcohol amine compound is selected from at least one of ethanolamine, dimethyl propanolamine, hydroxyethyl piperazine, piperidine, isopropanolamine, triisopropanolamine, aminomethyl propanolate, hydroxyethyl ammonium salt and the like; the polyamine compound is selected from any one of poly dimethyl diallyl ammonium chloride, polyquaternary ammonium salt, poly allylamine, polyurea, polybutanediamine, polyethyleneimine, polyethylene polyamine and a polyethyleneimine cross-linked substance. The clay stabilizer disclosed by the invention is particularly suitable for polymer dry powder direct distribution variable-viscosity fracturing fluid, the stability of clay can be remarkably improved, particularly, excellent inhibition performance can still be kept under high-temperature and high-salt conditions, stratum damage is reduced, and the application requirements in complex environments of oil fields are met.

The present invention provides an encapsulated composition comprising at least one core-shell microcapsule, wherein the at least one core-shell microcapsule comprises a core comprising at least one benefit agent and a shell surrounding the core, wherein the shell comprises:a) a polymeric stabilizer that is formed by combination of a bio-based polymeric surfactant with at least one aminosilane;b) a bio-based and biodegradable hydrocollolid; andc) a linker derived from a bio-based and biodegradable epoxy resin.The invention also provides a method for preparing the encapsulated composition, a consumer product comprising the encapsulated composition and the use of the encapsulated composition to improve the perception or enhance the performance of the benefit agent in a consumer product.

The invention relates to the technical field of biological and pharmaceutical preparations, and discloses an AS04 adjuvant composition for a vaccine as well as a preparation method and application of the AS04 adjuvant composition. The preparation method comprises the following steps: preparing 3-O-deacyl-4 '-monophosphoryl lipid A A polymer stabilizer; squalene; the preparation method comprises the following steps: S1, carrying out mixed adsorption on 3-O-deacyl-4'monophosphoryl lipid A and aluminum hydroxide, so as to prepare an adjuvant base core; s2, squalene and alpha-tocopherol are mixed and dissolved, and an oil phase premix is prepared; s3, dropwise adding the oil phase premix into the adjuvant-based core suspension under a low shearing force; s4, adding a polymer stabilizer solution into the mixture to carry out polymer coating; and S5, freeze-drying the final mixture. By sequentially constructing a multi-layer protection structure, the AS04 adjuvant is endowed with excellent freeze-drying stability, rapid redissolving performance and antigen activity protection effect.

The invention relates to a process for preparing a polyisoolefin homo- or copolymer, preferably selected from butyl rubber, polyisobutylene and poly(isobutylene-co-para methyl styrene), the process comprising the step of polymerizing at least one isoolefin monomer and optionally at least one copolymerizable monomer, preferably multiolefin monomer, in the presence of a preformed polymeric stabilizer. The preformed polymeric stabilizer comprises repeating units derived from styrene and repeating units having pendant linear or branched saturated alkyl groups with at least 3 carbon atoms. Preferably, the repeating units with the pendant alkyl groups are derived from monoterpenes, especially myrcene or ocimene, or sesquiterpenes, especially farnesene, and subsequently hydrogenated. The preformed polymeric stabilizer advantageously stabilizes the slurry of the polyisoolefin homo- or copolymer, preferably selected from butyl rubber, polyisobutylene and poly(isobutylene-co-para methyl styrene), that is formed during polymerization in a solvent.

The present invention relates to a polycarbodiimide composition, particularly comprising a specific polycarbodiimide and a small amount of P. The polycarbodiimide composition can be used as a stabilizer for polymers, particularly as a hydrolysis stabilizer for thermoplastic polyurethane compositions. Furthermore, the present invention relates to a process for preparing the polycarbodiimide composition, and a polycarbodiimide composition obtainable or obtainable by said process.

The invention relates to the technical field of semiconductor surface engineering, in particular to a method and a device for growing nanorods on the surface of a quartz piece. The method for growing the nanorods on the surface of the quartz piece comprises the following steps: putting the cleaned quartz piece into a mixed solution formed by a polymer stabilizer, an alcohol solvent, a salt stabilizer aqueous solution, a catalyst and ethanol for 10-60 minutes, so that emulsion droplets are adsorbed on the surface of the quartz piece; dropwise adding a silicon dioxide precursor into the mixed solution, and reacting the emulsion droplets with the silicon dioxide precursor to obtain the quartz piece with the nano-columns on the surface. The appearance and density of the nano-columns on the surface of the quartz piece can be regulated and controlled, and the adhesive force of the surface of the quartz piece is improved.

The invention belongs to the technical field of synthesis of propylene acetate, and discloses a supported catalyst, a preparation method thereof and a method for synthesizing propylene acetate by using the supported catalyst. The preparation method comprises the following steps: mixing and dispersing a metal palladium source, a metal copper source, a polymer stabilizer and a solvent to prepare a metal precursor solution; after a carrier is treated with alkali liquor, a metal precursor solution is sprayed to the surface of the carrier; then carrying out reduction treatment under the action of a reducing agent; and finally, dipping by adopting an acetate solution to prepare the supported catalyst. The polymer stabilizer is selected from at least one of polyvinyl alcohol, polyimide, carboxymethyl cellulose sodium, polyethyleneimine, polyacrylic acid and polymethyl methacrylate. The supported catalyst for synthesizing allyl acetate provided by the invention has high catalyst activity, can improve the utilization rate of noble metals, the conversion rate of reactants and the selectivity of reaction products, and reduces the synthesis cost of allyl acetate.

The present invention provides a composition for manufacturing liraglutide-containing microneedles that contains liraglutide as an active ingredient, without denaturation of the active ingredient during manufacture, and maintains stability even after manufacture, and liraglutide-containing microneedles with enhanced stability manufactured using the composition. The composition for manufacturing liraglutide-containing microneedles according to the present invention uses a specific combination of a biodegradable polymer, a stabilizer and an antioxidant to prevent the denaturation of the active ingredient liraglutide during the manufacture of microneedles and to ensure that the stability of liraglutide is maintained after the manufacture of microneedles.