摘要:
The present invention provides a method and an apparatus for forming a continuous web from a block of material. The block material has a base and a central axis extending generally orthogonally from the base. The apparatus preferably comprises a bath including a fluid into which the block of material can be at least partially submersed. Further, the apparatus preferably includes means for rotating the block about the central axis, a cutting device and means for linearly decreasing the predetermined distance of the cutting blade from the central axis. The cutting device is preferably positioned so as to make a cut into the block at a predetermined distance from the central axis, the cut being generally parallel to the central axis of the block. The material cut form the block preferably forms a continuous web.
摘要:
An improvement in a continuous process for making high internal phase emulsions that are typically polymerized to provide microporous, open-celled polymeric foam materials capable of absorbing aqueous fluids, especially aqueous body fluids such as urine. The improvement involves recirculating a portion (about 50% or less) of the emulsion withdrawn from the dynamic mixing zone of this continuous process. This increases the uniformity of the emulsion ultimately obtained from this continuous process in terms of having the water droplets homogeneously dispersed in the oil phase. This also improves the stability of the HIPE and expands the temperature range for pouring and curing this HIPE during subsequent emulsion polymerization. The improvement also eliminates the need for a static mixer outside the dynamic mixing zone, and allows for processing where relatively low pressure drops are required across the mixing zone.
摘要:
Normally hydrophobic foams, such as polyurethane foams and polymerized water-in-oil emulsion foams, are rendered hydrophilic by means of treatment with simple surfactants and hydrophilizing agent salts. Thus, a surfactant-containing foam is treated with a solution of, for example, calcium chloride, and is dried to leave a substantially uniformly distributed residue of hydrated or hydratable calcium chloride on the surfactant-containing internal foam surfaces. In-use, the combination of surfactant and calcium chloride hydrate provides a hydrophilic surface to the foam. Other hydratable calcium or magnesium salts such as magnesium chloride can be used. The resulting hydrophilized foams are suitable for use in absorbent devices, including diapers, sanitary napkins, bandages, and the like.
摘要:
Normally hydrophobic foams, such as polyurethane foams and polymerized water-in-oil emulsion foams, are rendered hydrophilic by means of treatment with sorbitan monolaurate. Thus, a polymeric foam can be prepared or treated with sorbitan monolaurate and thereafter dried to leave a substantially uniformly distributed residue of sorbitan monolaurate on the internal foam surfaces. The resulting treated foams are rendered hydrophilic and are thus suitable for use in absorbent devices, including diapers, sanitary napkins, bandages, and the like.
摘要:
The object of this invention is to provide a composition of thermoplastic rubber which can be extruded into fibers and films with exceptional strength and good elasticity. Current formulations of some thermoplastic rubbers cannot be extruded into fibers or films with the accompanying strength and elasticity.Compositions of the current invention comprise 20 to 50% by weight of one of a group of fatty acids or fatty alcohols containing from about 12 to about 24 carbon atoms and 80 to 50% by weight of a member selected from the group consisting of A-B-A block copolymers, where B is poly(ethylenebutylene) and A is a thermoplastic polymer which is phase incompatible with B.This composition of matter results in a thermoplastic rubber composition that is easily extrudable into fibers or films. Extruded fibers of the current composition can be made into elastic fabrics, elastic bands for clothing or made into nonwoven structures for use in elastic bandages or wrapping. Films of the new composition can be used to make articles such as elastic disposable diaper backsheets or shower caps.
摘要:
Described are absorbent members useful in the containment of body liquids such as urine. These absorbent members comprise at least one osmotic absorbent (preferably a hydrogel-forming absorbent polymer) and a high surface area material, and have a high capillary suction capacity. For purposes of the present disclosure, capillary suction capacity is measured in terms of the member's ability to uptake liquid at high capillary heights, which are generally encountered when the member is positioned in an absorbent article. In particular, capillary suction capacity is measured in terms of a member's capillary sorption absorbent capacity, which is measured in accordance with the Capillary Sorption method described in the Test Methods section.
摘要:
Absorbent articles such as diapers, incontinent briefs, training pants, diaper holders and liners, feminine hygiene garments, and the like, designed to provide sustained dynamic fit about the wearer during use as well as to improve the containment of body exudates and wearer comfort/mobility. Such an absorbent article has an absorbent core preferably designed to fit within the low motion zone of the wearer so that dynamic forces imparted by movements of the wearer on the absorbent core are minimized. The absorbent article is also provided with a closure system for anchoring the absorbent article on the wearer to sustain the dynamic fit of the absorbent article throughout wearing. The closure system is designed so that a primary line of tension, fitting at an angle to the body, is formed to secure the absorbent article on a wearer. The absorbent article preferably further comprises elastic features for fitting about the extremities of the wearer, including elastic waist features, elastic leg features, and elastic side panels, that allow freedom of movement for the wearer as well as maintenance of forces about the body to sustain the fit of the absorbent article. Preferred containment assembly (chassis) designs are also provided.
摘要:
The invention relates to the use of polymeric foam materials for insulation. These polymeric foams are prepared by polymerization of certain water-in-oil emulsions having a relatively high ratio of water phase to oil phase, commonly known in the art as high internal phase emulstions, or "HIPEs." The HIPE-derived foam materials used in the present invention comprise a generally hydrophobic, flexible, semi-flexible, or rigid nonionic polymeric foam structure of interconnected open-cells. These foam structures have:A) a specific surface area per foam volume of at least about 0.01 m.sup.2 /cc;B) a density of less than about 0.05 g/cc; andC) a glass transition temperature (Tg) of between about -20.degree. and 90.degree. C.The foams can be used as thermal, acoustic, and/or mechanical insulation materials.In a preferred embodiment, the foams used can be prepared, packaged, and shipped in a compressed, high density state and will "spring back" upon activation (e.g. heat) to the original density of the foam.
摘要:
Disclosed are absorbent foam materials suitable for use as or in the absorbent cores of absorbent articles, such as diapers which absorb and retain aqueous body fluids. Such foam materials comprise hydrophilic, flexible open-celled structures which are preferably prepared by polymerizing high internal phase (HIPE) water-in-oil emulsions. Such foam materials have a pore volume of from about 12 to 100 mL/g, and a capillary suction specific surface area of from about 0.5 to 5.0 m.sup.2 /g. These materials also exhibit a resistance to compression deflection such that a confining pressure of 5.1 kPa produces after 15 minutes a strain of from about 5% to 95% compression when the material is saturated at 37.degree. C. to its free absorbent capacity with synthetic urine.
摘要:
Disclosed are absorbent foam materials suitable for use as or in the absorbent cores of absorbent articles, such as diapers which absorb and retain aqueous body fluids. Such foam materials comprise hydrophilic, flexible open-celled structures which are preferably prepared by polymerizing high internal phase (HIPE) water-in-oil emulsions. Such foam materials have a pore volume of from about 12 to 100 mL/g, and a capillary suction specific surface area of from about 0.5 to 5.0 m.sup.2 /g. These materials also exhibit a resistance to compression deflection such that a confining pressure of 5.1 kPa produces after 15 minutes a strain of from about 5% to 95% compression when the material is saturated at 37.degree. C. to its free absorbent capacity with synthetic urine.