Abstract:
Disclosed are polymeric foam materials obtained using monomers based on silicon and/or germanium. The copolymerization of silicon- or germanium-based monomers provide foams that have low glass transition temperatures and low densities. These foams also exhibit relatively high yield stress values, which make the foams suitable for absorption of fluids, particularly aqueous fluids such as urine and menses (when the foams are rendered hydrophilic). The foams have a variety of other uses, including insulation applications.
Abstract:
This application relates to flexible, microporous, open-celled polymeric foam materials with physical characteristics that make them suitble for a variety of uses. This application particularly relates to degassing the components of the high internal phase emulsions which are subsequently cured to form such foams.
Abstract:
The present invention provides a polyvinyl alcohol powder having an average pore diameter of 0.1 to 10 µm and a pore volume in the range of 0.05 to 0.4 cm 3 /g Since the PVA powder of the present invention has an excellent solubility in water, an aqueous solution thereof can easily be prepared industrially. Since the PVA powder of the present invention has a low content of an organic volatile component and a low content of a nonvolatile component such as a carboxylic acid salt or the like which is derived from a basic catalyst, it has an excellent industrial handleability.
Abstract:
Relatively thin, collapsed, i.e. unexpanded, polymeric foam materials that, upon contact with aqueous body fluids, expand and absorb such fluids, are disclosed. A process for consistently obtaining such relatively thin, collapsed polymeric foam materials by polymerizing a specific type of water-in-oil emulsion, commonly known as High Internal Phase Emulsions or 'HIPE', is also disclosed.
Abstract:
Des macrostructures polymères absorbantes (52) et poreuses comprennent un agrégat réticulé interparticulaire ayant un volume à sec circonscrit de plus de 10,0 mm3. L'agrégat réticulé interparticulaire comprend une multiplicité de particules précurseurs d'un matériau polymère absorbant pratiquement insoluble dans l'eau et formant un hydrogel; et un agent de réticulation interparticulaire qui est amené à réagir avec le matériau polymère des particules précurseurs pour former des liaisons réticulées entre lesdites particules. En raison de la nature particulaire des particules précurseurs, la macrostructure (52) comporte des pores entre des particules précurseurs contiguës. Les pores sont reliés entre eux par des canaux qui communiquent entre eux de manière à ce que la macrostructure soit perméable aux liquides.
Abstract:
The invention relates to polyolefin foams consisting of polyolefins of ultrahigh molecular weight, i.e. weight-average molecular weight from about 4 x 10⁵ to 6 x 10⁶ g/mol and higher, and to a novel process for producing these foams by foaming a solution of a polyolefin of ultrahigh molecular weight in a solvent with the use of a physical or chemical blowing agent or of an inert gas blown into the solution, and cooling of the resulting foam to a temperature below the gelling tempereature of the polyolefin. If appropriate, these foams can be provided wholly or partially with a smooth skin on their surface by superficial cooling, if appropriate under the action of pressure. These foams are distinguished by high tensile strength and impact strength values, shock-absorbing properties, low glass transition temperatures, low embrittlement at low temperatures and high chemical resistance, and they are used especially as mechanical and acoustic insulating materials, materials of construction, filter agents and implantation materials.
Abstract:
적어도 테트라카복실산 성분과 다이아민 성분으로부터 얻어지는 폴리아믹산 용액과 착색 전구체를 포함하는 폴리아믹산 용액 조성물, 또는 폴리이미드 용액과 착색 전구체를 포함하는 폴리이미드 용액 조성물을 성형한 후, 250℃ 이상에서 열처리하는 공정을 포함하는 착색 폴리이미드 성형체의 제조 방법.