Abstract:
Method for continuously producing sponge bodies (1) made of regenerated cellulose using at least partially agglomerated pore inducers made of sodium sulphate decahydrate, in which at first a viscose solution is provided, the pore inducer is added to said viscose solution, the viscose solution is laid onto a conveyor belt which is continuously moving, wherein the viscose solution is led through baths on the conveyor belt, resulting in a porous mass made of regenerated cellulose.
Abstract:
A porous resin article which has a proportion of communicating pores of 30 % or more and is produced by a method comprising molding a resin containing a pore-forming material incorporated therein into a molded product, and then extracting the pore-forming material from the molded product by the use of a solvent, which dissolves said pore-forming material and does not dissolve the above resin, wherein the pore-forming material is particularly an alkaline compound. The above porous resin article has a high proportion of communicating pores, and thus can hold a great amount of a lubricating oil or the like, and also, is free from the formation of a rust in an iron product in an use involving the contact with a metal part or the like, even when the unextracted pore-forming material oozes out during use.
Abstract:
The present invention provides for concentrated aqueous silk fibroin solutions and an all-aqueous mode for preparation of concentrated aqueous fibroin solutions that avoids the use of organic solvents, direct additives, or harsh chemicals. The invention further provides for the use of these solutions in production of materials, e.g., fibers, films, foams, meshes, scaffolds and hydrogels.
Abstract:
Devices formed of or including biocompatible polyhydroxylkanoates are provided with controlled degradation rates, preferably less than one year under physiological conditions. Preferred devices include sutures, suture fasteners, meniscus repair devices, rivets, tacks, staples, screws (including interference screws), bone plates and bone plating system, surgical mesh, repair patches, slings, cardiovascular patches, orthopedic pins (including bone filling augmentation material), adhesion barriers, stents, guided tissue repair/regeneration devices, articular cartilage repair devices, nerve guides, tendon repair devices, atrial septal defect repair devices, pericardial patches, bulking and filling agents, vein valves, bone marrow scaffolds, meniscus regeneration devices, ligament and tendon grafts, ocular cell implants, spinal fusion cages, skin substitutes, dural substitutes, bone graft substitutes, bone dowels, wound dressings, and hemostats. The polyhydroxyalkanoates can contain additives, be formed of mixtures of monomers or include pendant groups or modifications in their backbones, or can be chemically modified, all to alter the degradation rates. The polyhydroxyalkanoate compositions also provide favorable mechanical properties, biocompatibility, and degradation times within desirable time frames under physiological conditions.
Abstract:
Pulverförmige, poröse Polymerteilchen werden hergestellt, indem man ein homogenes Gemisch aus mindestens 2 Komponenten eines schmelbaren Polymers und einer inerten Flüssigkeit bei einer Temperatur oberhalb der Entmischungstemperatur in ein Feststoffpartikelbett bringt, auf eine Temperatur unterhalb der Verfestigungstemperatur des Polymeren im Gemisch abkühlt und die dabei erhaltene kuchenartige Masse zerkleinert und die polymere Substanz von der inerten Flüssigkeit und den Feststoffpartikeln abtrennt. Als Feststoffpartikelbett wird vorzugsweise Natriumsulfat mit einer Körnung von 50 bis 400 µm verwendet. Als Polymere sind insbesondere Polypropylen und als inerte Flüssigkeit NN-Bis-(2-hydroxyäthyl)-hexadecylamin geeignet. Die pulverförmigen Teilchen können zum Abtrennen von hydrophoben Substanzen, insbesondere Öl von Wasser, zum Aufsaugen von Flüssigkeiten als Zusatz zu Anstrichmitteln als Träger von Substanzen zur Langzeitabgabe, insbesondere in der Land- und Forstwirtschaft sowie im Gartenbau sowie als Betonadditive verwendet werden.
Abstract:
Compositions et procede de preparation de formules polymeres qui graduellement, de maniere continue et uniforme, liberent divers composes pendant une longue periode de temps sous forme ionique et qui sont reconnus comme etant essentiels a la croissance d'especes vegetales a caractere agricole. Les composes, tels que des sels inorganiques de solubilites variables dans l'eau, sont incorpores de maniere monolithique dans une matrice thermoplastique contenant des substances porosigenes de maniere a reguler la vitesse de liberation. Ces substances porosigenes peuvent etre les sels solubles faibles ou moderes tels que les carbonates, bicarbonates, sulfates, phosphates, nitrates, etc. de metaux alcalins, les terres alcalines ou l'ammonium. Par exposition a l'humidite, l'admission d'eau dans le grain enleve les substances porosigenes par dissolution creant ainsi un reseau poreux permettant le contact de l'eau avec les molecules nutritives incorporees et leur liberation progressive dans l'eau pendant une periode de temps de deux mois a quatre ans environ ou plus.
Abstract in simplified Chinese:本发明系提出一种制备多孔隙高分子材料的方法。于本发明方法中,高分子材料与可溶性材料以固态的形式加以混合,再利用溶剂浸润的方式将高分子材料表面溶化,使其相互黏结,然后提供一压力差导入非溶剂(non-solvent)进入高分子材料内部,使溶解的高分子材料固化析出,其后再导入大量的水洗出其内部的可溶性材料,如此将可快速且大量地制备具有高孔隙率且内部孔洞彼此相通的多孔隙高分子材料。