Abstract:
Die Erfindung betrifft expandierbare Treibmittel enthaltende Polyolefinpartiket, die zur Verhinderung des Verklebens beim Verschäumen mit 0.01 bis 3 Gew.-% eines Salzes und/oder eines Esters einer langkettigen Fettsäure, vorzugsweise mit Calciumstearat, beschichtet sind.
Abstract:
Biocompatible polyhydroxyalkanoate compositions, particularly based on biotechnologically produced homo- and copolymers of 4- hydroxybutyric acid, with controlled degradation rates have been developed. In one embodiment, the polyhydroxyalkanoates contain additives like, for example, pore forming agents to alter the degradation rates. In another embodiment, the polyhydroxyalkanoates are formed of mixtures of monomers or include pendant groups or modifications in their backbones to alter their degradation rates. In still another embodiment, the polyhydroxyalkanoates are chemically modified. Methods for manufacturing the devices which increase porosity or exposed surface area can be used to alter degradability. As demonstrated by the examples, these polyhydroxyalkanoate compositions have extremely favorable mechanical properties, as well as are biocompatible and degrade within desirable time frames under physioogical conditions. These polyhydroxyalkanoate materials provide a wider range of polyhydroxyalkanoate degradation rates than are currently available. Methods for processing these materials, particularly for therapeutic, prophylactic or diagnostic applications, or into devices which can be implanted or injected, are also described.
Abstract:
A composition comprising a polymeric crystalline structure having lamellae and/or multilamellar structures and that is devoid of any amount of amorphous material that is detectable by Scanning Electron Microscopy (SEM) with a magnification of ×2,300 at working distance of 10 mm and acceleration voltage of 15 kV. A novel method or preparation of the composition is also disclosed.
Abstract:
To provide a method for producing a porous film in which even when minute fine particles are used, fine particles can be satisfactorily dispersed, a method for producing a composition for producing a porous film, and a porous film that can be produced by the method for producing a porous film. When a porous film is formed using a varnish including at least one resin component selected from the group consisting of polyamide acid, polyimide, a polyamide-imide precursor, polyamide-imide and polyethersulfone, and fine particles, varnish is produced by dispersing the fine particles by using a pressure device that pressurizes slurry including the fine particles and a dispersing device provided with a flow path whose cross-sectional area is 1960 μm2 or more and 785000 μm2 or less, and allowing the slurry pressurized to 50 MPa or more to pass through the flow path.
Abstract:
The present invention relates to a process for the processing of perfluoropolymer materials, and to the use of the resultant products in different potential applications, such as in the medical device field.
Abstract:
A method for preparing a porous fluoropolymer precursor includes combining a fluoropolymer and a removable additive to form a composition, the removable additive having a thermal decomposition temperature greater than a sintering temperature of the fluoropolymer, compressing the composition to form a preform, and sintering the preform to form the porous fluoropolymer precursor. A method for preparing a porous fluoropolymer includes disposing the porous fluoropolymer precursor in a removing agent, contacting the removable additive with the removing agent, and removing, by the removing agent, the removable additive from the porous fluoropolymer precursor to form the porous fluoropolymer, wherein the porous fluoropolymer comprises a plurality of pores formed by removing the removable additive
Abstract:
A thermoplastic sulfur-polymer composite comprises a thermoplastic polymer, such as polyethylene and polystyrene; and a sulfur element. Such sulfur element functions as passive sulfur filler in this composite. The thermoplastic polymer is a polymer matrix; and the sulfur filler is dispersed in the polymer matrix. There is no chemical reaction occurs after the addition of the sulfur filler into the host polymer and no chemical bond formed between the polymer and the sulfur filler. The thermoplastic sulfur-polymer composite can be a nanocomposite by either adding certain nanofillers into the composite or making the sulfur filler as sulfur nanoparticles. With its similar physical properties and lower manufacturing costs, the thermoplastic sulfur-polymer composites are good alternatives of the respective pure polymers.
Abstract:
The present invention includes compositions, methods, systems of making a composition that includes one or more active agent; a recognitive polymeric matrix; and a porosigen, wherein the composition comprises a porous recognitive, swellable hydrogel that dissociates under conditions of low water or humidity.
Abstract:
The present invention provides a porous resinous oil-retaining article, containing lubricating oil, which is excellent in the utilization efficiency of the lubricating oil, has a high mechanical strength, and further allows the resin and the lubricating oil to be combined with each other according to a use and a specification. The present invention also provides a method of producing the resinous oil-retaining article. The resinous oil-retaining article comprises a resinous porous article having interconnected holes which are open to a surface of the resinous porous article; and an oil impregnated into the resinous porous article. The interconnected holes are formed by molding a resin containing a pore-forming substance into a molding and extracting a part of the pore-forming substance from the molding with a solvent which dissolves the pore-forming substance and does not dissolve the resin. An interconnected hole porosity of the resinous porous article is not more than 30%.
Abstract:
The present invention is a method of producing porous beads, which comprises the steps of providing a first liquid phase comprising a bead matrix material and essentially edgy templating particle(s), said particle(s) being treated with a surface modifying agent; providing a second liquid phase which is immiscible with the first liquid phase; contacting the first phase and the second phase under conditions resulting in an emulsion of droplets comprised of the first liquid phase dispersed in the continuous second liquid phase; transforming the droplets to mesoporous beads by solidification of the liquid; and removing the templating particle(s) from the beads without causing any essential change of the surrounding bead, whereby hierarchical networks of pores are provided in the beads.