76results about How to "Improve the modification rate" patented technology

These cellulose nanofibers have an average degree of polymerization of 600 to 30,000, an aspect ratio of 20 to 10,000, an average diameter of 1 to 800 nm, and an X-ray diffraction pattern with an Iss-type crystal peak. Further, a hydroxyl group has been ester modified, and the degree of modification with respect to the entire hydroxyl group is at least 1.0.

Cellulose is impregnated with a reactive spreading solution containing a catalyst that includes a base catalyst or an organic acid catalyst, a monobasic carboxylic acid anhydride, and an aprotic solvent having a donor number of 26 or higher; the cellulose is esterified and chemically spread; and modified cellulose fine fibers are produced. Through this method, modified cellulose fine fibers that are nanosized and that have a high degree of crystallization, little damage to the fiber shape, a high aspect ratio, and exceptional dispersibility in organic solvents are obtained easily and efficiently without forceful crushing. The catalyst may include pyridines. The monobasic carboxylic acid anhydride may be a C2-4 aliphatic monocarboxylic acid anhydride. The resulting modified cellulose fine fibers are modified by the monobasic carboxylic acid anhydride, have a degree of crystallization of 70% or higher, have an average fiber diameter of 20-800 nm, and have an average fiber length of 1-200[mu]m.

Disclosed are: a polyolefin polymer having a polar group represented by the general formula (i), which is produced by modifying, with a high degree of modification rate, a double bond in a polymer that has the double bond at one terminal, at both terminals, or in the inside of its polymer chain and is produced by a known method; a method for producing the polyolefin polymer; and a water dispersionmaterial and a mold release agent composition each comprising the polyolefin polymer. (i) wherein PO represents a polyolefin polymer produced by the polymerization of a monomer comprising an ethyleneor an olefin having 3 to 20 carbon atoms, wherein a group inside the parentheses represents a polar group; A and B independently represent any one selected from R1, a cyano group, C(O)OR1 and C(O)NR1R2, provided that A and B may together form a cyclic structure; M represents a metal cation or an onium cation; j represents the number of the metal cation(s) or the onium cation(s), and is an integerof 0 to 4; i represents the number of valency of the metal cation or the onium cation, and is an integer of 0 to 4; D and E independently represent any one selected from an oxygen atom, a nitrogen atom, a sulfur atom, R3, OR3, SR3 and NR3R4, provided that D and E may together form a cyclic structure; d and e represent the number of valency of the substituent D and the number of valency of the substituent E, respectively, and independently represent an integer of 0 to 4; R1, R2, R3 and R4 independently represent any one selected from a hydrogen, an optionally substituted alkyl, alkenyl, alkynyl, aralkyl or aryl group having 20 or less carbon atoms, and a group having a heterocyclic ring; and n represents the average number of the functional groups, and is a number of 0.80 to 10.0.

A technique capable of constructing a disaster recovery system reduced in performance degradation of a primary system is provided. The technique includes a step of conducting synchronous writing of log information into a secondary storage subsystem in a secondary system when a write request received from a host computer is a write request of log information, a step of temporarily storing a write request and conducting asynchronous writing into the secondary storage subsystem when the received write request is a write request of database data or status information, a step of modifying log information, data in a database area, and status information in the secondary storage subsystem according to contents of a write request received from a primary storage subsystem, and a step of recovering the database area according to contents of log information in a location indicated by the status information.

The present invention relates to a substituted styrene compound which is effective in modifying a polymer expressed by the chemical formula 1 (see description and scope of claims), a method for producing the compound, a modified polymer comprising a functional group derived from the substituted styrene compound, a method for producing the modified polymer, a rubber composition comprising the modified polymer, and molded goods produced from the rubber composition.

The invention discloses a fluorosilicone resin / composite modified nano-material hybrid superamphiphobic coating and a preparation process thereof. The coating materials used include fluorosilicone resin, a dispersing solvent, and a composite modified nano-SiO 2 -TiO 2 Particles, coupling agent 1 and defoamer; composite modified nano-SiO 2 -TiO 2 The preparation method of the particles is, the nano-SiO 2 with nano TiO 2 Perform ball milling and mixing to obtain mixed nano-powder, add mixed nano-powder and surfactant to solvent 1 for dispersion to obtain mixed nano-powder dispersion, add coupling agent 2 to the mixture of solvent 1 and water to obtain coupling agent hydrolyzate , add the coupling agent hydrolyzate dropwise to the mixed nano-powder dispersion, stir and heat the reaction to obtain composite modified nano-SiO 2 -TiO 2 particle. Rely on SiO 2 -TiO 2 The composite modification of nanoparticles can greatly increase the amount of particles added without affecting other properties of the coating, so as to achieve technical purposes such as truly effective superamphiphobic, wear-resistant, and simple preparation processes for fluorosilicon coatings.

The present invention provides a modified conjugated diene-based polymer which includes a functional group derived from a substituted styrene-based compound and a functional group derived from an aminosilane-based compound, a method for preparing the same, and a rubber composition including the same. The modified conjugated diene-based polymer includes the functional group derived from an aminosilane-based compound of Formula 1 and a functional group derived from a substituted styrene-based compound of Formula 2 at both terminals of a main chain, and thus, shows a high modification ratio. When applying the polymer in a rubber composition, excellent affinity with a filler may be shown, and as a result, agglomeration of a filler in the rubber composition may be prevented, and the dispersibility of the filler may be increased, thereby improving the processability of the rubber composition.

The present invention relates to a modified conjugated diene-based polymer having a high modification ratio with improved compounding properties by being excellent affinity with a filler and a method for preparing the same. The modified conjugated diene-based polymer thus prepared includes a functional group derived from a compound represented by Formula 1 at one terminal, and has excellent affinity with a filler. If the modified conjugated diene-based polymer is applied to a rubber composition, excellent processability, tensile strength and viscoelasticity may be achieved.