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The present invention provides a nonwoven web prepared from an aliphatic polyester polymer which has sufficient tear strength and is biodegradable. Biodegradable nonwoven webs of the present are prepared from a polymer blend having from about 65% by weight to about 99% by weight of a biodegradable aliphatic polyester polymer and from about 1% by weight to about 35% by weight of a second polymer selected from the group consisting of a polymer having a lower melting point than the biodegradable aliphatic polyester polymer, a polymer having a lower molecular weight than the biodegradable aliphatic polyester polymer and mixtures thereof. Surprisingly, the nonwoven webs of the present invention have a tear strength greater than the tear strength of a nonwoven web prepared from the biodegradable aliphatic polyester polymer alone. In addition, other properties of the resulting nonwoven web, such as the tensile strength and energy to break, are not adversely affected, by the addition of the second polymer, in
An aliphatic polyester polymer compositions and preparation method thereof. The invention provides a bioresorbable aliphatic polyester copolymer, comprising the reaction product of a first polyester, a second polyester, and a coupling agent. Specifically, the first polyester and second polyester have the same repeat units, but different weight average molecular weights. Methods for preparing the aliphatic polyester copolymer are provided, in which the first polyester reacts with the second polyester in the presence of the coupling agent, undergoing copolymerization.
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There is an increasing demand for new materials in biomedical applications with material properties that are highly specific for each application area. The search for new materials requires the creation of materials with suitable mechanical properties, functionalities, three-dimensional structures and a controlled degradation profile. The focus of the work described in this thesis has been on the synthesis of functional degradable aliphatic polyesters, on the design of porous scaffolds and on their synthesis with bio-safe catalyst/initiator systems. An unsaturated aliphatic polyester has been synthesized by condensation polymerization to produce poly(but-2-ene-1,4-diyl malonate) (PBM), which was applicable as a cross-linked network and as a macro-co-initiator for the ring-opening polymerization (ROP) of cyclic ester monomers. The method of preparation of PBM was simple and straightforward and there was no need to purify the monomers or add a catalyst. PBM was successfully cross-linked with ...
A laminated polyester film comprising a polyester base film and a layer comprising a polyester graft copolymer and which is formed at least on one surface of said polyester base film, said polyester graft copolymer comprising a hydrophobic copolymerizable polyester resin and an acid anhydride having at least one double bond grafted to said polyester resin. The laminated polyester film of the present invention exhibits good adhesive property, water resistance and resistance to blocking, particularly excellent adhesive property, by applying a specific polyester graft copolymer to a polyester base film.
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Hyperbranched, aliphatic polyesters of theoretically calculated molar masses 1200-44 300 were synthesized in the molten state from 2,2-bis(hydroxymethyl)propionic acid (repeating unit of AB(x) type) and 2-ethyl-2-(hydroxymethyl)-1,3-propanediol (core molecule) using acid catalysis. The synthesis procedure was a pseudo-one-step reaction where stoichiometric amounts corresponding to each generation were added successively. The resulting polymers were glassy, slightly yellow solids at room temperature with hydroxyl groups as terminal groups. The degree of branching of the polyesters was determined with the help of model compounds using C-13-NMR and was found to be near 80%. The material exhibited good thermal stability as analyzed with TGA in a nitrogen atmosphere. Glass transition temperatures were determined using DSC and were found to be about 40 degrees C and to be relatively insensitive to variations in molar mass.. ...
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Abstract Peripheral nerves possess the capacity of self-regeneration after traumatic injury. Transected peripheral nerves can be bridged by direct surgical coaptation of the two nerve stumps or by interposing autografts or biological (veins) or synthetic nerve conduits (NC). NC are tubular structures that guide the regenerating axons to the distal nerve stump. Early synthetic NC have primarily been made of silicone because of the relative flexibility and biocompatibility of this material and because medical-grade silicone tubes were readily available in various dimensions. Nowadays, NC are preferably made of biodegradable materials such as collagen, aliphatic polyesters, or polyurethanes. Although NC assist in guiding regenerating nerves, satisfactory functional restoration of severed nerves may further require exogenous growth factors. Therefore, authors have proposed NC with integrated delivery systems for growth factors or growth factor,producing cells. This article reviews the most important ...
POLYESTER RESIN Polyester is a laminating resin cured by adding MEKP Orthophtalic Polyester is an all purpose resin, Isophtalic Polyester is more water resistant and the resin used for boatbuilding Polyester is made up in a 2 step process with raw materials from coal and petroleum bases to finally form a thermosetting plastic Polyester is mixed with up to 50% styrene, a monomer to improve the resins viscosity
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0002] Non-aqueous dispersions are known, as are microparticles produced by non-aqueous dispersion techniques. Typically, non-aqueous dispersions are prepared by the free radical addition polymerization of ethylenically unsaturated monomers in a hydrocarbon rich dispersing medium. The polymerization is carried out in the presence of a steric stabilizer, a portion of which is soluble in the dispersing medium and a portion of which is associated with the dispersed polymer; the dispersed polymer is insoluble in the dispersing medium. The steric stabilizer can be physically or chemically bound to the dispersed polymer. The portion of the steric stabilizer that is soluble in the dispersing medium is typically an aliphatic polyester or an acrylic polymer that is prepared from aliphatic monomers. There are several drawbacks with non-aqueous dispersions produced using these types of stabilizers due to the large difference in polarity, compatibility and solubility characteristics between the stabilizer ...
0127]Generally, if the degree of brilliance is high, normal reflectivity becomes large and the surface appears glossy; conversely, if the degree of brilliance is low, normal reflectivity also becomes low, and the surface appears to be rough. Also in reflective films, those with high normal reflectivity tend to have high front brightness and satisfactory light reflection capabilities. If the degree of brilliance on the side of the surface for reflection use of the present reflective film at 60° is in the range of 50 to 95, satisfactory light reflection capabilities, and in particular satisfactory brightness, are obtained. Such effects appear particularly notably in the case of a constitution in which, sequentially from the liquid crystal side in the internal constitution of a liquid crystal television, a brightness improvement sheet, a diffusion sheet, a diffusion plate, a cold cathode tube and a reflective film are layered. Conversely, if the degree of brilliance is below 50, diffuse ...
Article Anaerobic digestion of aliphatic polyesters. Anaerobic processes for the treatment of plastic materials waste represent versatile and effective approach in environmental protection and solid waste management. In this work, anaerobic biodegrad...
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TY - JOUR. T1 - Drug Delivery Nanocarriers from a Fully Degradable PEG-Conjugated Polyester with a Reduction-Responsive Backbone. AU - Yameen, Basit. AU - Vilos, Cristian. AU - Choi, Won Il. AU - Whyte, Andrew. AU - Huang, Jining. AU - Pollit, Lori. AU - Farokhzad, Omid C.. PY - 2015/8/1. Y1 - 2015/8/1. N2 - The remarkably high intracellular concentration of reducing agents is an excellent endogenous stimulus for designing nanocarriers programmed for intracellular delivery of therapeutic agents. However, despite their excellent biodegradability profiles, aliphatic polyesters that are fully degradable in response to the intracellular reducing environment are rare. Herein, a reduction-responsive drug delivery nanocarrier derived from a linear polyester bearing disulfide bonds is reported. The reduction-responsive polyester is synthesized via a convenient polycondensation process. After conjugation of terminal carboxylic acid groups of polyester to polyethylene glycol (PEG), the resulting polymer ...
There is an increasing need for synthetic bone substitute materials that decrease the need for allografts and autografts. In this study, composites of β-TCP and a biodegradable poly(L-lactide-co-ε-caprolactone) were manufactured using extrusion to form biodegradable composites with high β-TCP contents for osteoconductivity. The hydrolytic degradation of the composites containing 0, 10, 20, 35 and 50% of β-TCP was studied in vitro for 52 weeks. During the study, it was observed that β-TCP did not have an effect on the degradation rate of the polymer matrix. However, the crystallinity of the materials increased throughout the test series and changes in Tgs were also observed as the comonomer ratio of the polymer matrix changed as the degradation proceeded. The results show that the materials have desirable degradation properties and, thus, possess great potential as bioabsorbable and osteoconductive bone filling materials ...
Polyester fibres. Coloured scanning electron micrograph (SEM) of fibres of polyester material. Polyester is a synthetic material, and is made by a polymerisation reaction between two chemicals. Magnification: x75 at 6x6cm size. - Stock Image H120/0343
TROPICAL ROOFING PRODUCTS™ # 931 - TIETEX® T326 POLYESTER is a stitch-bonded, high-performance fabric for use in cold applied restoration roofing and roof maintenance systems. #931 - TIETEX® T326 POLYESTER comes with lay lines for one and two ply roof systems. It is ideal as the reinforcing component in cold process roofing and repair when used with water-based asphalt emulsion, acrylic coating, solvent type coatings, or mastics. Tear strength, puncture resistance, and tensile strength combined with elongation TIETEX® T326 POLYESTER has been shown in tests with asphalt emulsion and cutbacks to be far superior to conventional roofing felts weighing five to seven times as much. #931-TIETEX® T326 POLYESTER is a polyester that will readily conform to irregular surfaces and standing seam metal roof decks. It is also much easier to handle and apply properly than other soft polyester sheets. ARCAT provides architectural information on building materials, manufacturers, specifications, BIM families
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(polyestertime) -- The government of India is planning to remove excise duty on recycled polyester fiber soon to provide some relief to the manufacturer of Recycled polyester staple fiber (PSF). The exemption would be granted only if PSF was recy ...
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3-hydroxybutyric acid) (PHB) is the most commonly produced polyhydroxyalkanoate formed naturally inside many genera of bacteria and archaea when nutrients are limited and a carbon-source is available in excess. These water-insoluble biopolyester spherical beads in the size range of 20-800 nm can be recombinantly produced by insertion of the required PHB biosynthesis genes into alternative bacterial hosts and then culturing the organisms under suitable conditions. A gene fusion can also be made to enable production of PHB beads which display the selected proteins abundantly at the surface of the bead. Vaccines are needed which stimulate cell-mediated immunity and are effective at reducing intracellular infections such as tuberculosis, neosporosis and many viral infections. These diseases are responsible for a huge burden to human and animal health. Particulate vaccines target antigen presenting cells and cellular immune responses to protein antigens are enhanced when particulate vaccines are ...
Polyesters and polyester containers having a reduced coefficient of friction and improved clarity are produced using an antiblock agent comprising a dried talc having from about 20 to about 300 ppm water or a fatty acid tethered talc. The use of these talcs result in polyesters and polyester containers having a coefficient of less than about 1.0 and a clarity with haze values of less than about 4%.
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A fast crystallizing polyester composition comprising a block copolyester containing the repeating polymeric segments A and B wherein A is a polymeric segment of ethylene terephthalate units and B is a polymeric segment having a glass-transition temperature of less than 0 C. and preferably less than -20 C., the concentration of the segments of B being between 0.05 and 10 mole % of the block copolyester, and a crystallization nucleant which is an at least partially neutralized salt, preferably an alkali metal salt, of a polymer containing pendant neutralizable groups.
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A finely woven, shrinkable fabric of square-weave pattern suitable for use in the covering of aircraft frames. The fabric is formed entirely from high tenacity polyester filaments, preferably of 70-denier size. When so formed, it is significantly superior in properties of strength and elongation under load to fabrics made from regular tenacity, 70-denier polyester filaments. Such 70-denier fabrics made from regular tenacity polyester filaments do not meet the FAA requirements for aircraft cover utility, however. Consequently, although regular tenacity polyester filament fabrics have heretofore been used for aircraft cover purposes, in order to meet FAA requirements for such usage they have had to be substantially coarser and heavier than the high tenacity, 70-denier fabric of this invention.
Global demand for polyester fibers was valued at USD 73.5 billion in 2014 and is expected to cross USD 115.0 billion in 2020 and is anticipated to grow at a CAGR of slightly over 5% between 2015 and 2020.
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Many proteins and peptides possess specific biological activity that makes them potentially suitable as therapeutic agent for the treatment of various severe chronic and life-threatening diseases such as cancer. However, some pharmaceutical proteins have their target intracellularly. For the intracellular delivery of proteins/peptides, particularly for the ones that do not ... read more passively pass cellular membranes, suitable carrier systems such as polymeric nanoparticles (NPs) are required. In our study, the suitability of NPs based on a new type of polyester polymer for the controlled release and targeted intracellular delivery of (therapeutic) proteins was explored. Our results demonstrated that the release pattern of the embedded protein can be effectively modulated by changing polymer properties. Ribonucleases are small (10-28 kDa) basic proteins which are able to catalyze the degradation of cytosolic RNAs. Therefore these proteins have raised attention in the biopharmaceutical and ...
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