333 results about "Expandable microsphere" patented technology

Hollow thermoexpandable particles or microspheres are provided that contain hydrocarbon blowing agents and have a shell polymer that can be softened at the onset of the expansion temperature and solidified at a higher temperature (thermoset) in an expanded state. Preferably, the microspheres have a shell of thermally expandable and thermally crosslinkable polymer and a hollow interior that contains a hydrocarbon liquid that boils at a temperature below the heat activated crosslinking temperature of the polymer shell. The crosslinking of the shell polymer during or after expansion, which is heat activated at an elevated temperature, can solidify the shell polymer and, then, maintain the expanded volume of the microspheres. The thermoexpandable thermoset polymer particles are useful in insulation, packaging, for making foam materials such as polyurethane or polyisocyanurate rigid foams. The invented thermoset microspheres can substantially improve the close cell percentage and compressive strength of the foam materials and make the foam manufacturing less hazardous.

The present invention relates to a personal care absorbent article comprising at least two substrates each having an internal and external surface, wherein at least one substrate is a fluid permeable bodyside substrate selected from spunbond, meltblown, coform, airlaid, bonded-carded web, spunlace materials and combinations thereof; at least one substrate is an impermeable backsheet; and an absorbent core disposed in between said substrates; wherein at least the external surface of at least one substrate has applied to it a benefit agent selected from an additive composition wherein said additive composition is a polymer dispersion selected from polyolefin dispersions, polyisoprene dispersions, polybutadiene-styrene block copolymer dispersions, latex dispersions, polyvinyl pyrrolidone-styrene copolymer dispersions, polyvinyl alcohol-ethylene copolymer dispersions, and combinations thereof; an enhancement component selected from microparticles, expandable microspheres, fibers, additional polymer dispersions, scents, anti-bacterials, moisturizers, medicaments, soothers and combinations thereof; and combinations thereof.

This invention relates to composition containing expandable microspheres and at least one ionic compound and having a zeta potential that is greater than or equal to zero mV at a pH of about 9.0 or less at an ionic strength of from 10⁻⁶ M to 0.1 M., as well as methods of making and using the composition.

Process for the preparation of foamed thermoplastic polyurethanes characterized in that the foaming of the thermoplastic polyurethane is carried out in the presence of thermally expandable microspheres.

Composite foam based on expandable microspheres reinforced with fibers is described. Also disclosed are methods of making microsphere foam reinforced with fibers and methods of use thereof. The disclosure provides foam that performs equally and better than the performance of most thermoplastic foams commercially available.

A prosthetic heart valve includes a valve assembly mounted to an expandable stent. The prosthetic heart valve includes a cuff coupled to the stent. The cuff includes a pocket formed between an outer side and an inner side of the cuff. The pocket includes a plurality of biocompatible and irreversibly expandable microspheres. After implantation of the prosthetic heart valve into a patient, any gaps existing between the cuff and the native heart valve are exposed to bodily fluid, such as blood. The blood enters the pocket of the cuff through pores in the outer side of the cuff. The blood interacts with the microspheres, causing irreversible expansion of the microspheres. The microspheres expand to fill any gaps between the prosthetic heart valve and the native heart tissue, sealing the gaps and preventing leakage through the gaps.

A heat-peelable pressure-sensitive adhesive sheet which, even when used for temporarily fixing electronic parts having poor resistance to static electricity, such as magnetic heads, is effective in preventing the yield of such electronic parts from being reduced by electrostatic breakage, while ensuring its functions of adhesiveness before heating and peelability after heating. The heat-peelable pressure-sensitive adhesive sheet comprises a substrate and formed on at least one side thereof a heat-expandable pressure-sensitive adhesive layer containing heat-expandable microspheres, wherein the heat-expandable pressure-sensitive adhesive layer has a surface resistivity of 10¹² Ω/□ or lower. In this heat-peelable pressure-sensitive adhesive sheet, the heat-expandable pressure-sensitive adhesive layer before heating may have a center line average surface roughness of 2 μm or less and a maximum surface roughness of 5 μm or less. The adhesive sheet may have a rubber-like organic elastic layer interposed between the substrate and the heat-expandable pressure-sensitive adhesive layer.

A production process for heat-expanded microspheres comprising the step of providing a gaseous fluid containing heat-expandable microspheres, which comprise shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin and have an average particle size from 1 to 100 μm, feeding the gaseous fluid through a gas-introducing tube having a dispersion nozzle on its outlet and being fixed inside a hot gas flow, and emitting a jet of the gaseous fluid through the dispersion nozzle; a step wherein the gaseous fluid is collided on a collision plate fixed under the dispersion nozzle so as to disperse the heat-expandable microspheres in the hot gas flow; and a step wherein the dispersed heat-expandable microspheres are heated in the hot gas flow at a temperature not lower than their expansion initiating temperature and thus expanded. The production process results in minimum difference in the variation coefficient of particle size distribution between the microspheres before and after heat-expansion, slight ratio of raw microspheres and slightly expanded microspheres contained in resultant heat-expanded microspheres, and suppressed formation of aggregated microspheres.

The present invention is generally directed to an opaque tissue product and a process for making the same. The tissue products of the present invention comprise thermally expandable microspheres which impart increased opacity to the tissues. The thermally expandable microspheres are added to a fiber furnish during the wet end of a manufacturing process for bath tissue, facial tissue, towels, or the like.

Heat-expandable microspheres include a shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin, have a maximum expanding ratio not lower than 50 times, and are thermally expanded into hollow particulates having a repeated-compression durability not lower than 75 percent. The method of producing the heat-expandable microspheres includes the steps of dispersing an oily mixture containing a polymerizable component and the blowing agent in an aqueous dispersing medium containing a specific water-soluble compound and polymerizing the polymerizable component contained in the oily mixture.

The present invention discloses a composition comprising a) a thermoplastic vulcanizate and b) a thermo-expandable microsphere comprising a polymer shell and a propellant encapsulated in said polymer shell based on the total weight of the composition. The composition is suitable for making foam with balanced load deflection and elasticity, including soft touch, reduced to low deflection, improved relaxation performance and low water absorption, replacing either soft paint or assembled constructions with foam sheets and meeting requirements in soft touch applications.

The invention relates to an ultra-low density polypropylene composite material capable of being used for 3D printing and a preparation method thereof. The polypropylene composite material comprises the following composition in percentage by weight: 45-98% of polypropylene, 0-20% of a toughening agent, 0-20% of an inorganic filler, 1-10% of expandable microspheres, 0.2-0.5% of a nucleating agent, 0.2-2% of a stabilizing agent and 0-5% of other additives. The preparation method comprises the steps of weighing the raw materials according the percentage by weight, putting the materials into a high-speed mixer and carrying out dry-blending for 3-15 minutes, adding the mixed raw materials into a twin-screw extruder, carrying out melt extrusion, cooling and granulating, wherein the temperature of a first zone, a second zone, a third zone and a fourth zone in the screw cylinder are all 170-190 DEG C, the temperature of the machine head is 170-190 DEG C and the rotation speed of the twin-screw extruder is 100-1000 revolutions per minute. The ultra-low density polypropylene composite material disclosed by the invention has the advantages of low shrinkage, no warping, ultra low density, high rigidity and high toughness and can also be well suitable for 3D printing.

The specification discloses a method for making a paper material having a reduced tendency to cut human skin. The method includes providing a papermaking furnish containing cellulosic fibers and from about 0.5 to about 5.0 wt % by weight dry basis expandable microspheres, forming a paperboard web from the papermaking furnish, drying the web, and calendaring the web to a caliper of from about 11.0 to about 18.0 mils and a density ranging from about 7.0 to about 12.0 lb/3000 ft²/mil. Papers formed according to the method and articles formed therefrom are also disclosed.

A heat-peelable adhesive sheet which shows small increase in the degree of contamination caused by a heat treatment for lowering an adhesive force is disclosed. The heat-peelable pressure sensitive adhesive sheet comprises a heat-expandable layer containing heat-expandable microspheres and expanding upon heating, and. a non-heat expandable pressure-sensitive adhesive layer formed on at least one side thereof. The heat-peelable pressure-sensitive adhesive sheet can achieve the desired adhesive properties such as an excellent adhesive force before heating and also show a quick lowering of the adhesive force upon heating. Further, it shows small increase in the degree of contamination due to the treatment for lowering the adhesive force. Due to those characteristics, the heat-peelable pressure-sensitive adhesive sheet is practically applicable to, for example, the production of electronic parts made of thinner semiconductor wafers.

Coated articles are provided comprising:

• • (a) a substrate having two opposing surfaces;
  • (b) a first curable film-forming composition applied to one surface of the substrate, the first curable film-forming composition comprising:
    • (i) a resinous binder comprising a polyepoxide, a polyamideimide, a polyimide, and/or a polysiloxane;
    • (ii) optionally, a curing agent having functional groups reactive with functional groups on the resinous binder in (a); and
    • (iii) a metallic reflective pigment; and
  • (c) a second curable film-forming composition applied to the opposing surface of the substrate, the second curable film-forming composition comprising:
    • (i) a polyepoxide containing at least two epoxide groups per molecule;
    • (ii) a thermoplastic polyester polymer;
    • (iii) a curing agent having functional groups reactive with the epoxide groups in (c)(i);
    • (iv) a mineral filler; and
    • (v) microspheres comprising expandable microspheres and/or hollow microspheres.

Coated articles provide heat reflection, heat insulation, vibration damping, and sound absorption.

The invention relates to a double-sided pressure-sensitive adhesive sheet for use in fixing a liquid-crystal display module unit to a backlight unit in a liquid-crystal display, the double-sided pressure-sensitive adhesive sheet including at least one heat-peelable pressure-sensitive adhesive layer containing heat-expandable microspheres. According to the double-sided pressure-sensitive adhesive sheet of the invention, since the pressure-sensitive adhesive layer has high adhesiveness and a liquid-crystal display module unit can be tenaciously fixed to a backlight unit with the pressure-sensitive adhesive sheet, excellent adhesion reliability can be attained. Furthermore, since this pressure-sensitive adhesive sheet can be easily made peelable by a heat treatment, it has excellent suitability for reworking.

The invention discloses an expandable microsphere filling modified polypropylene composite material and a preparation method thereof. The composite material is composed of the following raw materials in percentage by weight: 60-98% of polypropylene, 1-10% of expandable microsphere, 0-25% of inorganic filler, 0.1-2% of compatilizer, 0-5% of toughener, 0.2-2% of stabilizer and 0-3% of other additives. The expandable microsphere used as the auxiliary additive for processing polypropylene can lower the density of the composite material without excessively influencing other properties, so that the composite material conforms to the requirements for trends to light weight of the existing automobile parts, and has very low density and favorable comprehensive mechanical properties; and by adopting the sectional feeding mode, the expandable microsphere and other components can be added into the extruder at the downstream of the screw bolt, thereby maximally avoiding the influence on the shearing and dispersion process of the foamed microsphere, and further enhancing the properties of the composite material.