Abstract:
A melt-flow controlling method for elastomer by uv irradiation for use in semiconductor packages by ultraviolet irradiation, in which a coated polymer composition is crosslinked by ultraviolet irradiation after a coating process of the polymer composition in producing the elastic adhesives. In producing the elastic adhesives for use as the thermal stress relief layer in semiconductor packages, the inventive method comprises irradiating the polymer composition with ultraviolet light of a 100-500 nm wavelength in order to control the flowability and crosslinking degree of the coated polymer composition. Thus, according to the present invention, a heating furnace is not used such that energy consumption can be reduced. Also, curing can be achieved in a short time so as to increase productivity, and the crosslinking degree is easily controlled by changing the ultraviolet dose as compared to the thermal crossliking process. Furthermore, an installation area of ultraviolet irradiation equipment is smaller than the heating furnace, and little or no epoxy reactive groups participate in the crosslinking reaction upon photo-polymerization so that the resulting film product has an excellent storage stability and thus a long life span.
Abstract:
Provided are a UV-curable pressure-sensitive adhesive composition comprising a photoinitiator which has a molar absorptivity at 365 nm of at least 1,000 mol−1·cm−1 and the maximum absorption wavelength of at least 420 nm on a long wavelength side; and an adhesive sheet having a layer of the composition disposed over a photo-transmitting base film. The pressure-sensitive adhesive sheet according to the invention can be cured even by exposure to ultraviolet rays at a low intensity or for short time so that it can contribute to energy saving and productivity improvement as a sheet for processing, fixation or surface protection of a semiconductor wafer.
Abstract:
An antisoiling hardcoated film comprising a substantially transparent substrate, a hardcoat layer comprising inorganic oxide particles dispersed in a binder matrix, and an antisoiling layer comprising a perfluoropolyether. The antisoiling layer can be very thin, thus reducing the cost of the perfluoropolyether. The film has very good scratch, smudge and glare resistance and very good interlayer adhesion and durability. The film can be in the form of a single flexible substrate or a stack of such substrates. The film or stack can be sized to fit the display screen of an electronic display device such as a personal digital assistant or cell phone.
Abstract:
A polyurethane adhesive which is useful in bonding porous and non-porous surfaces is provided. The adhesive is especially useful in bonding windshield glass into automotive frames under a variety of environmental conditions, particularly in after market windshield replacement applications. The polyurethane includes at least one urethane prepolymer which is based on at least one thermoplastic polyol. In one embodiment, the urethane prepolymer may be formed from one or more polyisocyanates, one or more polyetherpolyols and one or more thermoplastic polyesterpolyols, wherein the prepolymer has a free isocyanate content of from about 0.6 to about 3.5 % by weight, based on the weight of the polyurethane. In another embodiment, a one-part adhesive composition is provided which includes an isocyanate-functional and thermoplastic polyurethane prepolymer having a free isocyanate content of from about 0.6 to about 3.5 % by weight, based on the weight of the polyurethane, and a combination of several catalysts which are capable of catalyzing the reaction of isocyanate moieties with isocyanate-reactive moieties while providing less temperature dependent catalyzing of the reaction between isocyanate moieties and water. Also provided is a process for bonding two or more substrates together utilizing the polyurethane adhesive. In automotive windshield replacement applications, the polyurethane adhesive allows for a sufficient working time and development of green strength to provide a safe drive-away time within 1 hour at a temperature from about 0 to about 100null C.
Abstract:
An adhesive for batteries a solution of which has improved wetting properties, which affords improved adhesive strength and prevents deterioration of battery performance, and which can provide secondary batteries having an arbitrary shape, such as a thin shape, with high reliability and high charge and discharge efficiency, and a battery using the same are disclosed. An adhesive comprising a thermoplastic resin, a solvent capable of dissolving the thermoplastic resin, and a neutral and aprotic surface active agent is used as an adhesive for batteries for adhering an active material layer joined to a current collector to a separator, whereby a secondary battery which can take an arbitrary shape, such as a thin shape, with high reliability and high charge and discharge efficiency can be obtained.
Abstract:
This invention relates to an article comprising a bio-supportive media which bio-degrades at a preferred rate, comprising at least one bio-limiting agent and at least one nutritional source on a substrate. The media may be characterized as a polymer, composite, or amalgam of commonly used materials. The invention relates to altering the physical/chemical composition of the media such that biodegradation can occur at a specific, usually accelerated, preferred rate. Further, the biodegradation rate may be managed and balanced concurrently with the ability to provide for the exposure of integral component(s) which are bio-active. This relationship essentially provides for a managed release or managed availability of agent(s) which creates a new set of ecological conditions. These sustained conditions can maintain a micro-habitat; a limited consort of species, often slime which, due to this ecological trophic niche position, can utilize innate allelopathic means to further protect their position and deter predation. The relationships of the nutrients, bio-limiters, and biomass comprise a unique micro-habitat as an interface which provides protection from corrosion and deterioration of the substrate upon which it is fixed, and limits the biomass accumulation on the surface thereby providing control of fouling by reducing higher order organism(s) attachments, which otherwise are very economically costly. Specifically the invention relates to modifying the media formation whether as a polymer or composite or amalgam such that the physical and chemical properties of the media are altered to become more degradable in the host habitat. This is accomplished by altering the polymerization or formation of the composite or amalgam to provide for increased inter-granular or molecular locations which permit enhanced bio-degradative activity. Then by occluding or interspersing physically or chemically an agent which has bio-active properties, the organisms of various species which may attach or be attracted to the surface can be limited by their nutrition and tolerance of bio-active preference without the need for toxification or mechanical removal of undesirable or unwanted organisms as settlers. Once the community of selected organisms establishes a natural equilibrium with the host habitat any capacity for allelopathic protection of the biofilm can be utilized or enhanced by this new and unique biological community to its benefit through management of the media components.
Abstract:
A method for producing a pressure sensitive adhesive composition includes at least one elastomer that produces a substantially homogeneous pressure sensitive adhesive composition. The method is particularly well suited for relatively high throughput continuous compounding rates, e.g., at a throughput rate of more than about 5.4 kg/hr/l free volume of the continuous compounding device utilized in the
Abstract:
The present invention discloses a water-dispersion type pressure-sensitive adhesive composition, a method for producing the same, and a pressure-sensitive adhesive product employng the same. With the present invention, the hydrophilic nature of dispersant (C) can be nullified by reacting a compound (B), containing a metal having a valence of at least two or having a specific functional group having reactivity, with the functional groups of dispersant (C), with the result that while being a water dispersion type pressure-sensitive adhesive composition, it displays excellent water resistance properties on a par with pressure-sensitive adhesives made from solvent type pressure-sensitive adhesive compositions.
Abstract:
A developer container having an opening for discharging a developer contained therein and a sealing surface portion surrounding the opening, is sealed with a sealing member having a sealant layer and applied onto the sealing surface portion of the developer container with the sealant layer. The sealant layer contains a dispersed material therein and the sealing surface portion of the developer container contains a dispersed material, which is mutually soluble with the dispersed material in the sealant layer. The dispersed material in the sealant layer preferably includes a thermoplastic elastomer. The resultant sealed developer container may be provided with a sound seal structure even at a relatively low sealing pressure causing a smaller sealing surface depression of the developer container, which allows re-sealing of the container.