摘要:
Es soll ein Verfahren zur Herstellung von Hydroxypropylcellulose-Formteilen bereitgestellt werden, bei dem Hydroxypropylcellulose eingesetzt wird, bevorzugt reine Hydroxypropylcellulose, aber auch Hydroxypropylcellulose- Blends bzw. Mischungen mit anderen Polymeren oder Additiven, und wobei das Verfahren besonders effizient und umweltfreundlich ist. Des Weiteren sollen die nach dem Verfahren hergestellten Formteile eine besonders hohe Aufnahme an 0,9%iger, wässriger Natriumchloridlösung aufweisen, wasserunlöslich sein und für eine vielfache Verwendung geeignet sein, insbesondere in medizinischen Anwendungen, bevorzugt zur Wundversorgung bzw. als Wundauflage. Erfindungsgemäß umfasst das Verfahren zur Herstellung von Hydroxypropylcellulose-Formteilen, insbesondere von -Fasern, -Vliesstoffen, - Faserflächengebilden, -Schwämmen und/oder -Filmen, folgende Schritte: a) den Einsatz von reinem Hydroxypropylcellulose-Polymer oder von einem Hydroxypropylcellulose-Blend bzw. einer Mischung mit anderen Polymeren oder Additiven, insbesondere mit einem Weichmacher, b) die thermoplastische Verarbeitung aus der Schmelze des Hydroxypropylcellulose-Polymers oder des Hydroxypropylcellulose- Blends und c) die chemische Vernetzung der Hydroxypropylcellulose, insbesondere durch Bestrahlen bzw. strahlungsinduziert oder elektrochemisch oder thermisch.
摘要:
A curable formaldehyde-free binding composition for use with fiberglass is provided. Such curable composition comprises an aldehyde or ketone and an amine salt of an inorganic acid. The composition when applied to fiberglass is cured to form a water-insoluble binder which exhibits good adhesion to glass In a preferred embodiment the composition when applied to fiberglass provides a sufficient blackness required in facer products.
摘要:
The invention relates to an adhesive system comprising - a protein; - a polymer comprising at least one carboxylic group or at least one carboxylic anhydride group, or a combination thereof, with the proviso that said polymer does not contain 5 to 90 wt-% of vinyl pivalate units in combination with 0.2 to 15 wt-% of primary hydroxyl group-containing vinyl compound units, and - a polyamine-epihalohydrin. The invention further relates to the use of the adhesive system, an adhesive composition, a method of producing a wood based product and a wood based product.
摘要:
This invention relates to an electrolyte composition comprising an ionic liquid, a gellant selected from a cellulose derivative, gelatine and combinations thereof, and a radiation- curabie base. It also provides an electrochemical device comprising the electrolyte composition
摘要:
Polysaccharide thermosetting systems and composites utilizing such systems include formaldehyde free binders formed from at least one polysaccharide and at least one polysaccharide crosslinker.
摘要:
Particles comprising a combination of a carboxyalkyl cellulose and a starch, wherein the particles comprise a plurality of non-permanent metal crosslinks and a method for making the particles. The non-permanent intra-fiber metal crosslinks include multi-valent metal ion crosslinks formed with one or more metal ions selected from aluminum, boron, bismuth, titanium, and zirconium ions.
摘要:
A hydratable gel-forming polymer may be sterilized by chilling the polymer below ambient temperature and sterilizing the chilled polymer using ionizing radiation (e.g., E-Beam radiation). Doing so may reduce the degradation in physical properties caused by ionizing radiation sterilization of the polymer while at ambient temperature, and may preserve or retain desired hydration or gel-forming characteristics.
摘要:
An improved non-toxic soft tissue filler is provided. The soft non-toxic tissue filler consists of textured surfaced spherically shaped solid particles of a size range of between about 32 and 90 microns (depending on the concentration that is desired) that are suspended evenly in a gel as a carrier. The solid particles are preferably a non-ceramic cured polymer such as polymethylmethacrylate (PMMA). The gel is a combination of a cellulose polysaccharide such as carboxymethylcellulose (CMC) and an alcohol such as polyvinyl alcohol (PVA) dissolved in water or some other solvent. The filler is used by injection in order to augment a patient's soft tissue as well as to correct soft tissue defects.
摘要:
Compositions comprising carboxypolysaccharides (CPS) including carboxymethyl cellulose (CMC) and polyethylene glycols (PEGs) are provided where the PEG is a PEG-epoxide covalently linked to the CPS via an addition reaction In certain embodiments, the PEG attaches to only one CPS, forming a decorated CPS In other embodiments, bi-functional PEG molecules are attached to adjacent CPSs, thereby forming a covalently cross-linked composition A PEG can be linked to the CPS by way of an ether linkage or by way of an ester linkage, and in still further embodiments, PEG molecule(s) can be attached to CPS molecule(s) by way of both ether and ester linkages PEG/CMC compositions can include multi-branch and/or a multi-arm PEG Compositions having desired viscoelastic properties can be used as space-filling materials, load-bearing materials, anti-adhesion compositions for drug delivery vehicles or for lubrication of tissues and medical instruments.