Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer lösungsmittelstabilen Polymermembran, bei dem eine Poly(meth)acrylnitril enthaltende Lösung, die gleichzeitig einen Vernetzer enthält, eingesetzt wird. Die Lösung kann als Film gegossen und der Film vernetzt werden. Ebenso ist es möglich, aus der Lösung eine Hohlfadenmembran zu spinnen und diese anschließend zu vernetzen. Die dabei entstehende Polymermembran auf Basis von Poly(meth)acrylnitril bzw. hiervon abgeleiteten Copolymeren zeichnet sich durch eine durchgängig ausgebildete Vernetzung aus. Zudem wird eine Lösung beschrieben, enthaltend ein Lösungsmittel sowie darin gelöst ein Poly(meth)acrylnitril bzw. hiervon abgeleitetes Copolymer sowie einen Vernetzer für das Polyacrylnitril, die sich für das erfindungsgemäße Verfahren zur Herstellung der erfindungsgemäßen Polymermembranen eignet.
Abstract:
The present disclosure provides a composition that includes a low viscosity ethylene/a-olefin copolymer or a low viscosity functionalized ethylene/a-olefin copolymer and a solvent. Each copolymer has a melt viscosity less than or equal to 20.0 Pa.s (177°C). The solvent is a non-aromatic and halogen-free solvent. The solvent has a boiling point from 100°C to 170°C. The composition has a Relative Energy Difference (RED) less than or equal to 1.05 (J/cc) 1/2 , based on the Hansen Solubility Parameter.
Abstract:
Described is a class of symmetrical and asymmetrical N-alkyl lactam ethers. One preferred ether is bis-N-ethyl pyrrolidone ether. Preferred compositions and uses of the ethers are in performance chemicals, personal care, and pharmaceutical fields, where they function a variety of roles, including as a solvent, solubilizer, freezing point depressor, diluent, extracting agent, cleaning agent, degreaser, absorbent and/or dispersion agent.
Abstract:
본 발명은 수성에폭시 조성물에 관한 것으로 에폭시 수지와 응집제를 사용함으로써 응집제의 엉킨 입자표면에 유화제와 물이 안정적으로 흡착 포획될 수 있어 다량의 물을 함유할 수 있는 수성 에폭시 수지 조성물에 관한 것이다. 본 발명에 따른 수성 에폭시 조성물은 경화제의 경화 반응에서 가교결합이 양호하며 상용성이 원활한 조성으로 2차 조성에서 코팅제, 프라이머제, 모르타르제, 접착제 등의 기능을 수행할 수 있으며, 기존 에폭시 수지 조성물에서와 같은 다량의 휘발성 유기화합물을 전혀 사용하지 않는 조성으로서 환경 친화적이며 생산원가 또한 현저히 절감할 수 있다.
Abstract:
Hydroxypolyamides, hydroxypolyamide products, and post-hydroxypolyamides are disclosed as gel forming agents. Hydroxypolyamides and post-hydroxypolyamides are prepared from known methods. Hydroxypolyamide products are produced from a modified polymerization procedure which utilizes strong base for deprotonation of ammonium salts from the esterification of stoichiometrically equivalent polyacid:polyamine salts. The hydroxypolyamide products are capable of gel formation at lower concentrations than hydroxypolyamides and post-hydroxypolyamides from the known methods of preparation, and are therefore superior gel forming agents.
Abstract:
A purification method for a biological fluid comprising at least a filtration step through a membrane obtained from a sulfone polymer (PSI) derived from bio-based feed-stocks. In particular the polymer (PSI) comprises more than 50% moles recurring units (RPSI) comprising sugar moieties selected from the group consisting of those of formulae (E′-I) to (E′-III):
A membrane free from pore-forming agents comprising at least one sulfone polymer (PSI) and a method for preparing such a membrane.
Abstract:
A vinyl acetate-ethylene (VAE) copolymer and uses of the same are provided. The vinyl acetate-ethylene (VAE) copolymer includes a structural unit derived from ethylene and a structural unit derived from vinyl acetate. The 1H-NMR spectrum of the vinyl acetate-ethylene (VAE) copolymer has an integral value B of signals from 0.5 ppm to 1.0 ppm and an integral value A of signals from 4.6 ppm to 5.0 ppm, and the value of B/3A ranges from 0.070 to 0.120. The 1H-NMR spectrum is measured by using dimethyl sulfoxide as a solvent.
Abstract:
This disclosure relates to an organic gel formulation composition for blocking fluids in naturally fractured carbonate reservoirs, for salinity conditions up to 31,870.50 ppm of total dissolved solids and temperatures up to 120° C., that is, for the purpose temporarily isolating areas of the reservoirs, that will be treated with chemical and radioactive products to quantify the oil remaining in them, the stability of the gel is controlled in a certain period of time, through the synergic effect of the supramolecular interaction between the components of the gel formulation. A disclosed composition may include 0.3 to 1% by weight of a copolymer of acrylamide butyl tertiary of sulfonic acid and acrylamide, and 0.12 to 0.4% by weight of phenol and from 0.18 to 0.6% by weight of hexamethylenetetramine.
Abstract:
This invention relates to gel compositions for filling cables, such as communication cables, in particular to gel compositions containing microspheres, to cables comprising said gels, and to methods of preparing such gel.