3923 results about "Chain segment" patented technology

Compositions for scavenging oxygen are disclosed. These compositions comprise condensation copolymers comprising predominantly polyester segments and an oxygen scavenging amount of polyolefin oligomer segments. The polyester segments comprise segments derived from typical bottling and packaging polyesters such as PET and PEN. The copolymers are preferably formed by transesterification during reactive extrusion and typically comprise about 0.5 to about 12 wt % of polyolefin oligomer segments. The copolycondensates are capable of absorbing at least 0.4 cc of oxygen per gram of copolymer in the solid state at ambient temperatures and are typically used as layers in films, liners, cups, wraps, bottles, etc. Use of these oxygen scavenging compositions in bottles provides a clear and rigid bottle similar in appearance to unmodified polyester bottles. In a series of preferred embodiments, bottles fabricated with the oxygen scavenging copolycondensates of this invention are over 99.4 wt % polyester and suitable for recycle with other polyester bottles.

The present invention is a, solid block copolymer comprising at least two polymer end blocks A and at least one polymer interior block B wherein each A block is a polymer block resistant to sulfonation and each B block is a polymer block susceptible to sulfonation, and wherein said A and B blocks do not contain any significant levels of olefinic unsaturation. Preferably, each A block comprising one or more segments selected from polymerized (i) para-substituted styrene monomers, (ii) ethylene, (iii) alpha olefins of 3 to 18 carbon atoms; (iv) hydrogenated 1,3-cyclodiene monomers, (v) hydrogenated monomers of conjugated dienes having a vinyl content less than 35 mol percent prior to hydrogenation, (vi) acrylic esters, (vii) methacrylic esters, and (viii) mixtures thereof; and each B block comprising segments of one or more polymerized vinyl aromatic monomers selected from (i) unsubstituted styrene monomers, (ii) ortho-substituted styrene monomers, (iii) meta-substituted styrene monomers, (iv) alpha-methylstyrene, (v) 1,1-diphenylethylene, (vi) 1,2-diphenylethylene and (vii) mixtures thereof. Also claimed are processes for making such block copolymers, and the various end uses and applications for such block copolymers.

The present invention relates to a polymeric drug conjugate with one or more biologically active agents conjugated via an enzymatically cleavable linker to either a regular repeating linear unit comprising a water soluble polymer segment and a multifunctional chemical moiety, or a branched polymer comprising two or more water soluble polymer segments each bound to a common multifunctional chemical moiety, as well as to methods of making such conjugates. The present invention is also directed to pharmaceutical compositions comprising such conjugates and to the use of such conjugates to treat pathological conditions.

The invention provide a class of chain-extended polysiloxane crosslinkers which comprises (1) at least two polysiloxane segments, wherein each pair of adjacent polysiloxane segments is linked by one divalent organic radical which includes at least one pendant hydrophilic group (hydroxyl and/or carboxyl groups) or at least one dangling hydrophilic polymer chain and a di-thioether linkage —S-DR—S— in which DR is a divalent organic radical; and (2) two terminal ethylenically unsaturated groups. The present invention is also related to a polymer comprising crosslinking units derived from chain-extended polysiloxane crosslinker of the invention and to ophthalmic lenses comprising such a polymer.

Thermoplastic polyurethanes having an alternating sequence of hard and soft segments in which a nanostructured polyhedral oligosilsesquioxane diol is used as a chain extender to form a crystalline hard segment constituting SMPs. The polyurethanes are formed by reacting a polyol, a chain extender dihydroxyl-terminated polyhedral oligosilsesquioxane and a diisocyanate. The polyurethanes have multiple applications including for example, implants for human health care, drug delivery matrices, superabsorbant hydrogels, coatings, adhesives, temperature and moisture sensors, etc.

The invention relates to polyester DTY fiber and a preparation method thereof. The preparation method comprises: metering a modified polyester melt, extruding, cooling, oiling, and winding to preparethe polyester POY fiber. According to the present invention, during the cooling, the longitudinal height is maintained, and the cross section area of the slow cooling chamber is increased while the plate surface temperature of the spinning plate is maintained by using the thermal insulation method; the material of the fiber is the modified polyester, the molecular chain of the modified polyester comprises a terephthalic acid chain segment, an ethylene glycol chain segment and a diol chain segment having the branched chain, the structure formula of the diol chain segment having the branched chain is defined in the specification, R1 and R2 are respectively and independently selected from straight chain alkylidene with a carbon atom number of 1-3, R3 is selected from alkyl with a carbon atomnumber of 1-5, and R4 is selected from alkyl with a carbon atom number of 2-5; the chromatic aberration [delta]E of the prepared fiber is less than 0.200; and the preparation process is simple and reasonable, and the obtained fiber has excellent performance.

A photopolymerizable polymer micelle includes a spherical micelle that encapsulates a hydrophobic photopolymerization initiator, the spherical micelle being formed by a block copolymer having a hydrophilic block segment and a hydrophobic block segment, the block copolymer having a number average molecular weight exceeding 10000, and the hydrophobic block segment at least partially having a radically polymerizable group.

Disclosed are useful constructs and methods for the expression of proteins using primary translation products that are processed within a recombinant host cell. Constructs comprising a single open reading frame (sORF) are described for protein expression including expression of multiple polypeptides. A primary translation product (a pro-protein or a polyprotein) contains polypeptides such as inteins or hedgehog family auto-processing domains, or variants thereof, inserted in frame between multiple protein subunits of interest. The primary product can also contain cleavage sequences such as other proteolytic cleavage or protease recognition sites, or signal peptides which contain recognition sequences for signal peptidases, separating at least two of the multiple protein subunits. The sequences of the inserted auto-processing polypeptides or cleavage sites can be manipulated to enhance the efficiency of expression of the separate multiple protein subunits. Also disclosed are independent aspects of conducting efficient expression, secretion, and/or multimeric assembly of proteins such as immunoglobulins. Where the polyprotein contains immunoglobulin heavy and light chain segments or fragments capable of antigen recognition, in an embodiment a selectable stoichiometric ratio is at least two copies of a light chain segment per heavy chain segment, with the result that the production of properly folded and assembled functional antibody is made. Modified signal peptides, including such from immunoglobulin light chains, are described.

A sulfonated aromatic perfluorocyclobutane block copolymer comprises a hydrophobic perfluorocyclobutane ether chain segment and a hydrophilic sulfonated perfluorocyclobutane ether chain segment. The sulfonated perfluorocyclobutane copolymer may be used to make proton conductive membranes and membrane electrode assemblies in fuel cells. Processes of making the block copolymer through thermal coupling reactions are also disclosed.

The invention discloses a preparation method and application of resin having double curing groups. The resin having double curing groups comprises epoxy monoacrylate and polyurethane acrylate chain segments and has the following structure. The molecule of the resin having double curing groups has an acrylate double bond (a curing free radical) and an epoxy group (a curing or thermally curing anion), so the brittleness of a cured film is reduced and the flexibility of the cured film is improved and the resin can be used in ultraviolet curing paint, adhesive and ink. The resin can improve large shrinkage factor of a single acrylate free radical curing system and large brittleness and poor flexibility of the UV curing film and the like and can also solve the problem that a several-resin mixed compounding system has unstable performance, uneven local curing, poor compatibility among resin and the like.

A method of preparing a multiarm polymer includes reacting a branched polyol with one or more functionalizing reagents to effect substitution of an ionizable functional group or a protected ionizable functional group, Y, to form a mixture comprising (i) unsubstituted branched polyol containing no Y groups; (ii) a monosubstituted polyol comprising one Y group, and (iii) a multisubstituted polyol (e.g., a disubstituted polyol comprising two Y groups); followed by purifying the mixture to separate the monosubstituted polyol from other species Thereafter, a water-soluble and non-peptidic polymer segment is attached to the monosubstituted branched polyol at the site of at least one of the hydroxyl groups. The invention also provides purified monosubstituted branched polyols and multiarm polymers prepared by the method and polyol precursors for use in the method.

The invention relates to a polyacrylate water-based adhesive for electrode materials of a lithium ion battery, a preparation method of the adhesive and electrode plates of the lithium ion battery. The adhesive is a cross-linked high-solid-content polyacrylate water-based adhesive; the polymer molecule chain segment of the adhesive comprises a hydrophilic segment and a lipophilic segment which are cross-linked through a cross-linking agent to form a spatial reticular structure. The electrode plates produced by the adhesive cannot fall off in charge and discharge processes, the adhesive has a relatively good adhesion effect on the positive and negative electrode materials of the lithium ion battery, and the expansion of electrode plates of graphite anode materials, especially silicon-based materials can be inhibited.

The invention relates to a polyvinyl alcohol-polypeptide-polyethylene glycol graft copolymer and a preparation method thereof. The molecular weight of polyvinyl alcohol is 20,000-80,000; the molecular weight of a polypeptide chain segment is 4,000-8,000; and the molecular weight of a polyethylene glycol chain segment is 350-750. The preparation method comprises the following steps of: (1) synthesizing a polypeptide homopolymer which contains an end-NCO radical: adding the polypeptide homopolymer, diisocyanate, dibutyltin dilaurate serving as a catalyst and dimethyl sulfoxide serving as a solvent into a reactor for reacting to obtain a target product; (2) synthesizing a polyvinyl alcohol-polypeptide graft copolymer: adding the polypeptide homopolymer which contains the end-NCO radical, the solvent and the catalyst into the reactor, adding polyvinyl alcohol and reacting to obtain a target product; and (3) synthesizing a polyvinyl alcohol-polypeptide-polyethylene glycol graft copolymer: adding the polyvinyl alcohol-polypeptide graft copolymer, the solvent and the catalyst into a drying reactor, adding polyethylene glycol monomethyl ether and reacting to obtain a target product.

The invention relates to polyester fibres and a preparation method thereof. The raw material of the polyester fibres is modified polyester which consists of a terephthalic acid chain segment, an ethylene glycol chain segment and a branched chain-containing dihydric alcohol chain segment. The preparation method of the polyester fibres comprises the following steps: performing esterification reaction on terephthalic acid and branched chain-containing dihydric alcohol under the catalysis of concentrated sulphuric acid to obtain terephthalic acid dihydric alcohol ester; then, preparing the terephthalic acid and the ethylene glycol into slurry, and performing the esterification reaction on the slurry to obtain the terephthalic acid ethylene glycol ester; finally, stirring and mixing the terephthalic acid dihydric alcohol ester and the terephthalic acid ethylene glycol ester, and performing condensation polymerization in a low vacuum stage and a high vacuum stage under the action of a catalyst and a stabilizing agent to obtain modified polyester; metering, extruding, cooling, oiling, stretching, heat-setting and winding the polyester to prepare the polyester fibres. The increasing amplitude of the spatial gaps of the polyester fibres is much higher than that of branched chain-free polyester fibres at the same temperature, which is beneficial to the degree of micro particles, such as a dye, that enter the polyester; the dyeing rate is improved.

The invention designs an organic silicon modified polyurethane resin for synthetic leather and a preparation method thereof, relating to the processing field of synthetic leather. The invention solves the technical problems of poor anti-sticking performance, poor water resistance, poor wear resistance and the like of the existing synthetic leather. The resin provided by the invention is characterized by comprising the following raw materials in mass percent: 2-30% of diisocyanate, 5-40% of polyester or polyether polyol, 0.5-20% of terminal hydroxyl organic silicon, 0-10% of small molecular polyol chain extender, 0-13% of small molecular polyamine chain extender, 0.01-1% of catalyst and the balance of solvent, wherein the terminal hydroxyl organic silicon adopts a polyether-polysiloxane copolymer of which the two ends are hydroxyl groups, and the polyether chain segment is polyoxyethylene or polyoxypropylene. The glossiness and transparency of the polyurethane resin modified by the invention can not be influenced by organic silicon, and simultaneously, the anti-sticking performance, surface smoothness, wear resistance and water resistance of the modified polyurethane resin can be obviously improved.

The present invention provides a resin composition excellent in strength, impact resistance, heat resistance and moldability and further, of low environmental load capable of decreasing CO₂ exhaustion in its production.

The present invention is a resin composition comprising a styrene-based resin (A), an aliphatic polyester (B) and at least one species selected from a compatibilizer (C) and a dicarboxylic anhydride (D), and the compatibilizer is preferably at least one species described below.

• • (C-1) methyl methacrylate polymer
  • (C-2) a vinyl-based polymer to which epoxy unit or acid anhydride unit is copolymerized
  • (C-3) a graft polymer in which methyl methacrylate unit is grafted to a rubbery polymer
  • (C-4) a block copolymer in which polylactide segment and a vinyl-based polymer segment

The invention designs organic silicon-modified polyurethane resin for synthetic leather and a preparation method thereof, which relates to the field of processing of the synthetic leather and aims at solving the technical problems of poor anti-sticking property, water resistance, wear resistance and other properties of the existing synthetic leather. The organic silicon-modified polyurethane resin disclosed by the invention is characterized by comprising the following raw material ingredients in percentage by weight: 2%-30% of diisocyanate, 5%-40% of polyester or polyether type polylol, 0.5%-20% of hydroxyl-terminated organic silicon, 0%-10% of small molecular polylol chain extender, 0%-13% of small molecular polyamine chain extender, 0.01%-1% of catalyst and the balance of solvent, wherein the hydroxyl-terminated organic silicon adopts a polyether-polysiloxane copolymer with two ends which are of hydroxyl groups, and a polyether chain segment is of polyoxyethylene or polyoxypropylene. The glossiness and transparency of the polyurethane resin after modification can not be affected by the organic silicon, and the anti-sticking property, surface smoothness, wear resistance and waterresistance are obviously improved simultaneously.

The present invention is directed to an oxygen scavenger composition comprising a mixture of (i) a polyester polymer composed of polymer segments containing cycloalkenyl group or functionality; and (ii) an ester type polymer selected from (a)a polyester having a high content of alkylene groups; (b) a polylactone; and (c) a polyvinylacetate having at least about 50 weight percent vinyl acetate mer units therein. The present polymer composition has been found to act as an oxygen scavenger agent under both ambient and refrigerated conditions, to be compatible with conventional film forming packaging materials, to provide compositions exhibiting low tack, and to be capable of being readily processed using conventional film forming equipment.

Soft propylene-based resin compositions, which comprise substantially the following block (I) and block (II): Block (I): propylene-based polymer having propylene unit chain segments that bond in a mode of head-to-tail bonding, in which the chain segment has an isotactic block-containing stereoblock structure; Block (II): copolymer containing at least propylene and ethylene, exhibit good flexibility, transparency, and heat resistance.