202 results about "Dynamic viscoelasticity" patented technology

The invention relates to the field of optical protection materials, and provides a transparent film with laser eavesdropping prevention performance and a preparation method thereof.The transparent film is composed of surface-modified doped tungsten oxide nanosheets, amino-isocyanate bifunctional lithium niobate nanowires, urethane acrylate, an ultraviolet light absorber, a silane coupling agent, a dispersing agent and a flatting agent; the molybdenum-doped tungsten oxide nanosheets are obtained through silane coupling modification after hydrothermal synthesis, and the lithium niobate nanowires are prepared through a gradient modification process of hydrothermal synthesis-silane coupling-isocyanate grafting-phenol end capping. A modified nano material is uniformly dispersed in a resin matrix through an ultrasonic dispersion composite technology, and through blade coating forming, ultraviolet curing and constant-temperature and constant-humidity post-treatment, compared with the prior art, the scheme overcomes the problems that a traditional protective film is insufficient in optical transparency, laser eavesdropping prevention function and dynamic viscoelasticity, and is suitable for the field of high-end security and protection.

The present invention provides a pressure-sensitive adhesive composition suitable for forming a pressure-sensitive adhesive sheet having a smooth surface. The pressure-sensitive adhesive composition of the present invention includes a β-1,3-glucan derivative G. The pressure-sensitive adhesive composition has a tan δ of 0.7 or more at 200° C. as determined by the following test. Test: a disc-shaped evaluation sample is produced from a pressure-sensitive adhesive composition. The evaluation sample is subjected to a dynamic viscoelasticity measurement to determine a tan δ thereof at 200° C.

The present invention relates to a polishing pad including a polishing layer and a cushion layer, wherein a ratio E′B40 / E′C40 of a storage elastic modulus at 40° C. in dynamic viscoelasticity measurement performed under a bending mode condition with a dry state, a frequency of 10 rad / s, and 20 to 100° C., E′B40, to a storage elastic modulus at 40° C. in dynamic viscoelasticity measurement performed under a compression mode condition with a dry state, a frequency of 10 rad / s, and 20 to 100° C., E′C40, is 3.0 or more and 15.0 or less, and a loss factor tan δ in the dynamic viscoelasticity measurement performed under the bending mode condition is 0.10 or more and 0.30 or less in a range of 40° C. or more and 70° C. or less.

A polishing pad contains: a polishing layer having a polishing surface for polishing a workpiece; and a cushion layer disposed on the side of the polishing layer opposite from the polishing surface. With regard to the ratio (tan δ) of the storage elastic modulus E′ to the loss elastic modulus E″ of the whole polishing pad, as obtained through dynamic viscoelasticity measurement using frequency dispersion (25° C.) in a bending mode, the ratio of the maximum value of tan δ measured at 100-1000 rad / s (tan δmax100-1000) to the maximum value of tan δ measured at 1 to 10 rad / s (tan δmax1-10) is 0.75 to 1.30.

To provide an adhesive tape which can reduce adhesion enhancement due to high temperatures and can also be used for a material which does not transmit light.SOLUTION: There is provided an adhesive tape having an adhesive layer, wherein the adhesive layer has a shear storage modulus of 4.0×104 to 1.0×106 Pa at 25°C as evaluated by dynamic viscoelasticity measurement and the adhesive layer has a contact angle to water of 80 degrees of more after the adhesive layer side of the adhesive tape is attached to glass, heated at 220°C for 120 minutes and peeled off.SELECTED DRAWING: None

A heat-shrinkable polyester film is provided, in which the loss coefficient and the like are controlled in a plurality of temperature regions, and which has excellent wrinkle resistance characteristics. The heat-shrinkable polyester film is a heat-shrinkable polyester film derived from a polyester resin composition containing 30% to 90% by weight of an amorphous polyester resin and 10% to 70% by weight of a crystalline polyester resin with respect to the total amount, in which (a) a loss coefficient obtained using a dynamic viscoelasticity measuring apparatus has a first loss coefficient peak in a temperature region of below 100° C.; (b) a loss coefficient obtained in the same manner has a second loss coefficient peak in a temperature region of 100° C. or higher; and (c) a heat shrinkage ratio obtained when the film is immersed in hot water at 80° C. for 10 seconds is 30% or more.

The purpose of the present disclosure is to provide a coating composition that exhibits excellent discharge stability. A coating composition according to the present disclosure has the following features.　The coating composition contains a hydroxy group-containing resin (A) and a curing agent (B), and is to be applied to an object to be coated by an inkjet method. When a dynamic viscoelasticity measurement is performed thereon at a temperature of 23°C and a frequency of 0.5 Hz in a stress measurement range of 0.1-20 Pa, the stress σ2 as measured when the storage elastic modulus has decreased by 10% for the first time with respect to the storage elastic modulus G'1 when the stress is 0.1 Pa is in a range of 1.0-15 Pa.

To provide a quantitative sealant evaluation method for selecting an optimum primer that can ensure long-term reliability of waterproofing of joints on the exterior walls of buildings. [Solution] The evaluation method for sealant 10 includes the following steps: a first step of evaluating the adhesion between adherend 11 and primer 12, and the adhesion between primer 12 and sealant 10, for each temperature condition using a movement test on test specimen 1; a second step of determining the tensile stress as a mechanical property of sealant 10 using a static tensile test and determining the complex modulus of tensile deformation of sealant 10 using a dynamic viscoelasticity test; a third step of determining a relationship diagram between the tensile stress of sealant 10 determined in step 2 and the complex modulus of tensile deformation of sealant 10; and a fourth step of judging the suitability of primer 12 using the relationship diagram determined in step 3, based on the adhesive peel strength of primer 12 assuming the usage environment obtained from steps 1 and 2.

An object of the present disclosure is to provide a rubber composition which comprises a hydrogenated carboxy-modified acrylonitrile-butadiene rubber as a base rubber and from which a crosslinked rubber having excellent mechanical strength and a great friction coefficient is obtained even if the rubber composition is vulcanized at a high temperature. The present disclosure provides a grip rubber composition comprising a base rubber, a vulcanizing agent and a vulcanization accelerator, wherein the base rubber contains a hydrogenated carboxy-modified acrylonitrile-butadiene rubber, the rubber composition comprises a thiuram based vulcanization accelerator in an amount of 4 parts by mass or more, a sulfenamide based vulcanization accelerator in an amount of 0.3 part by mass or more, and a thiourea based vulcanization accelerator in an amount of 0.1 part by mass or more with respect to 100 parts by mass of the base rubber, and a crosslinked rubber obtained by curing the rubber composition at a vulcanizing temperature of 185° C. has a loss coefficient (tan δ) and a complex elastic modulus (E*) (MPa) at a temperature of 25° C. in a ratio (tan δ / E*) ranging from 0.027 to 0.052, wherein the loss coefficient (tan δ) and the complex elastic modulus (E*) (MPa) at the temperature of 25° C. are measured with a dynamic viscoelasticity measuring apparatus (an oscillation frequency: 10 Hz, a strain amplitude: 0.05%, and a tensile mode).

The present invention provides an adhesive sheet having a photocurable adhesive layer, wherein the photocurable adhesive layer exhibits photocurability suitable for a reduction in peel strength due to light irradiation and is based on a polymer that does not utilize solution polymerization. [Solution] Provided is an adhesive sheet having an adhesive layer that is cured by light irradiation. The total content of the azo-based polymerization initiator and the peroxide-based polymerization initiator in the adhesive layer is 1.0 [mu] g / g or less. The adhesive sheet has a storage modulus increase rate of 300% or more as determined by the following formula. The storage modulus increase rate [%] = (R / Q-1) * 100 (wherein Q and R are storage modulus G '([Pa]) at 25 DEG C as determined by dynamic viscoelasticity measurement, Q is initial storage modulus G' measured using a measurement sample obtained from the adhesive layer, and R is post-curing storage modulus G 'measured after curing by irradiating the measurement sample with ultraviolet light).

The purpose of the present invention is to provide an adhesive tape having excellent adhesive force in a high-temperature environment. The purpose of the present invention is also to provide an adhesive composition having excellent adhesive force in a high-temperature environment. The present invention is an adhesive tape having an adhesive layer, the adhesive layer containing an acrylic copolymer, the shear storage modulus of the adhesive layer at 150 DEG C measured by dynamic viscoelasticity measurement at a measurement frequency of 1 Hz being 8.0 * 104 Pa to 3.0 * 105 Pa, and the shear storage modulus of the adhesive layer at 150 DEG C being 3.0 * 105 Pa to 3.0 * 105 Pa. The loss tangent (tan [delta]) at 150 DEG C as measured by dynamic viscoelasticity measurement at a measurement frequency of 1 Hz is 0.10-0.40 (inclusive).

An electrostatic charge image developing toner, an electrostatic charge image developer, a toner cartridge, a process cartridge, an image forming apparatus, and an image forming method, the electrostatic charge image developing toner having toner particles containing an amorphous resin and a crystalline resin as binder resins, and an external additive, the external additive contains inorganic particles having a specific gravity of 1.3-2.0, and in a dynamic viscoelasticity measurement when the temperature of the toner particles is reduced from 110 DEG C to 30 DEG C, the ratio of a loss tangent tan [delta] (80) at a temperature of 80 DEG C to a loss tangent tan [delta] (60) at a temperature of 60 DEG C, namely tan [delta] (80) / tan [delta] (60), is 0.90-1.40, and the loss tangent tan [delta] (80) at a temperature of 80 DEG C is 1.20-1.70.

To provide a polymer composition for an electrochemical element capable of providing a conductive material composition with good dispersibility.SOLUTION: Provided is a polymer composition for an electrochemical element, the polymer composition comprising: a polymer including an aliphatic hydrocarbon unit and a nitrile group-containing unit; and an amide-based liquid medium, where the polymer has a tan δ (loss tangent) of more than 1 in the strain range of 0.01-10% in dynamic viscoelasticity measurement at a temperature of 100°C and a frequency of 10 Hz.SELECTED DRAWING: Figure 1

To provide an adhesive composition which is excellent in 180-degree peel adhesive force, constant load holding power and shear retention force among adhesive characteristics and has high removability and to provide an adhesive tape having an adhesive layer composed of the adhesive composition.SOLUTION: In order to exhibit favorable adhesive properties in an adhesive composition, it is crucial to adjust the dynamic viscoelasticity of the adhesive composition among various physical properties and it was found that the storage modulus G' strongly correlates with shear holding force performance and tanδ strongly correlates with constant load holding power performance. Specifically, it is necessary for the storage modulus G' at a constant temperature to be above a certain value in order to achieve an adhesive layer having excellent shear retention force and it was found that it is necessary for the tanδ at a constant temperature to be equal to or above a certain value in order to achieve an adhesive layer having excellent constant load holding power.SELECTED DRAWING: None

An electrostatic image developing toner, an electrostatic image developer, a toner cartridge, a process cartridge, and an image forming apparatus and method. The toner includes toner particles including an amorphous polyester resin and a crystalline resin, the toner particles including, as the amorphous polyester resin, an amorphous polyester resin (S) having at least one of a structural unit derived from an aliphatic dicarboxylic acid represented by formula (A) and a structural unit derived from an aliphatic diol represented by formula (B), the ratio of the total of the two types of structural units in the total of all structural units constituting the amorphous polyester resin is 0.5% to 10.0% in terms of molar ratio, and the toner particles have a minimum value tan [delta] (min) of loss tangent of 0.50 to 1.00 at 50 to 80 DEG C in a dynamic viscoelasticity measurement when the temperature is raised from 30 DEG C to 120 DEG C in the toner particles. And nA and nB each independently represent an integer of 2-12 (inclusive).

The invention relates to the technical field of semiconductor manufacturing, and discloses a wafer polishing treatment system based on pressure regulation and control, which comprises a partition pressure regulation and control module, a micro-disturbance excitation injection module, an interface rheological state analysis module and a dynamic hysteresis inversion control module. The dynamic viscoelastic modulus is calculated in real time, an inverse dynamic model is constructed according to the dynamic viscoelastic modulus to generate an advanced compensation component aiming at the viscoelastic hysteresis effect, the transient ballistic overshoot phenomenon is effectively restrained through the strain rate hardening and hysteresis characteristics of the active hedging polishing pad under high-speed pressure switching, and therefore the transient ballistic overshoot phenomenon is effectively restrained. The problems of over-polishing and defects caused by pressure response dislocation are solved, and the wafer planarization quality under the advanced manufacturing process is improved.

The present invention provides a biodegradable polyester resin composition, a method for preparing the same, and a biodegradable polyester film prepared from the same, the composition comprising a resin including a residue of a dicarboxylic acid component and a residue of a diol component, and satisfying formula 1. By satisfying Formula 1, the productivity and processability of the biodegradable polyester resin composition are improved, thereby enhancing the tensile strength, elongation, and tear strength of the biodegradable polyester film. [Formula 1]: In Formula 1, G'is the storage modulus at a temperature of 190 DEG C and a frequency of 10 radian / sec to 100 radian / sec in dynamic viscoelasticity measurement, and G ''is the loss modulus at a temperature of 190 DEG C and a frequency of 10 radian / sec to 100 radian / sec in dynamic viscoelasticity measurement.

An electrostatic charge image developer contains a toner including toner particles that contain a binder resin and a carrier including magnetic particles and a resin layer that adheres to a surface of the magnetic particles, in which, in a dynamic viscoelasticity measurement of the toner, in a case where a loss tangent tanδ at a temperature of 90° C. and a strain of 1% is represented by D1 (90), a loss tangent tanδ at a temperature of 90° C. and a strain of 50% is represented by D50 (90), a loss tangent tanδ at a temperature of 150° C. and a strain of 1% is represented by D1 (150), and a loss tangent tanδ at a temperature of 150° C. and a strain of 50% is represented by D50 (150), each of D1 (90), D50 (90), D1 (150), and D50 (150) is 0.5 or more and 2.5 or less, a value of D50 (150)−D1 (150) is less than 1.5, and a value of D50 (90)−D1 (90) is less than 1.0, and in the surface of the magnetic particles, an average unevenness interval Sm and an arithmetic mean roughness Ra satisfy 0.5 μm≤ Sm≤2.5 μm and 0.3 μm≤ Ra≤1.2 μm.

To provide a narrow and large-diameter tire capable of improving noise performance at high speeds without compromising handling performance at low temperatures.The tire has a tread portion formed of an elastomer composition. A relationship between a tire outer diameter (Dt) and a tire cross-sectional width (Wt) satisfy a following expression (1). The tread portion includes at least one circumferential groove extending in a tire circumferential direction. A rubber thickness at a groove bottom of the circumferential groove is 0.05 to 0.25 times a maximum thickness of the tread portion. The elastomer composition has a phase difference δ of 5.0×10−2π [rad] or less between a maximum value of strain and a maximum value of stress when repeatedly deformed at a temperature of 30 degrees Celsius and a frequency of 10 Hz in a dynamic viscoelasticity test;1963.4≤(Dt2×π / 4) / Wt≤2827.4  (1).

This adhesive composition is for forming an adhesive layer provided between a support substrate and a semiconductor substrate having bumps, the adhesive composition containing an adhesive component (A) that is cured by a hydrosilylation reaction, the Young's modulus of the adhesive layer as measured by dynamic viscoelasticity measurement being 5 MPa or more.

Provided is an adhesive composition that can be used for multi-stage curing, that can obtain excellent adhesive properties in a low cross-linked state after one-time curing, that can be efficiently subjected to multi-stage curing even when the amount of active energy rays during curing is small, and that can be used for multi-stage curing. Alternatively, during curing, multi-stage curing can be efficiently performed using active energy rays in the visible light region, and after final curing, high elasticity of the adhesive layer can be achieved, and excellent adhesive properties, reliability, and shape stability can be obtained. A pressure-sensitive adhesive composition containing: an acrylic resin (A) having a glass transition temperature, calculated from dynamic viscoelasticity, of 12 DEG C to 40 DEG C; and a structural unit derived from an alkyl (meth) acrylate (a1) having an alkyl group having 5 or more carbon atoms, and a structural unit derived from an ethylenically unsaturated monomer (a3) containing an amide group.

A composition containing a polymerizable monomer (A) and an elastomer (B), in which the polymerizable monomer (A) contains a monofunctional (meth) acrylate (A1) and a highly polar monomer (A2), and the glass transition temperature of a cured product obtained by curing the composition at 23 DEG C for 24 hours as determined by dynamic viscoelasticity measurement is 180 DEG C or higher.

To provide a golf ball improved in durability without substantially lowering resilience.SOLUTION: A golf ball has a core, and a cover of at least one layer positioned outside the core. The cover of the at least one layer is formed of a cover composition containing one or more kinds of an ionomer resin obtained by neutralizing with at least one kind of metal ion selected from Groups I, II, and XII of the periodic table, at least a part of a carboxyl group and / or a dicarboxylic anhydride group in a copolymer (P) containing as the essential constitutional units, a structural unit (A) derived from ethylene and / or 3-20C α-olefin, and a structural unit (B) derived from a monomer having a carboxyl group and / or a dicarboxylic anhydride group. A loss elastic modulus E''at 0°C obtained by measuring the dynamic viscoelasticity of the cover composition in a specific condition is 3.40×107 Pa or less.SELECTED DRAWING: None

The purpose of the present invention is to provide an adhesive tape capable of achieving both excellent bending resistance and excellent impact absorption. Another purpose of the present invention is to provide an electronic device including the adhesive tape. The present invention is an adhesive tape having a foam layer. The foam layer has a shear storage modulus of 0.3 MPa or more at 23°C as measured by dynamic viscoelasticity measurement at a measurement frequency of 1 Hz, and the foam layer has a loss tangent of 0.50 or more at 23°C as measured by dynamic viscoelasticity measurement at a measurement frequency of 100 Hz.

Provided are a copper ink that suppresses bleeding when printing copper ink on a substrate and makes it possible to manufacture a highly reliable circuit pattern with few short circuits, and an electronic circuit board using the same and a method for producing an electronic circuit board. The present invention is a copper ink containing copper particles, wherein the thixotropy index TI, defined by the ratio (η1 / η10) of the viscosity η10 at a shear rate of 10 sec-1 to the viscosity η1 at a shear rate of 1 sec-1, is 7.5 or less and the hysteresis area of shear stress by dynamic viscoelasticity measurement, when the shear rate is raised from 0.01 sec-1 to 300 sec-1 over 50 seconds, held at 300 sec-1 for 50 seconds, and lowered from 300 sec-1 to 0.01 sec-1 over 50 seconds, is 3000 Pa∙sec-1 or more.

To provide a film containing an aliphatic polyester which is excellent in biodegradability, processability, quietness and barrier properties and can be suitably used for packaging applications and agricultural, forestry and fishery applications.SOLUTION: The aliphatic polyester film contains at least a polyhydroxyalkanoic acid and has a loss tangent (tan δ (30)) of ≥ 0.05 and ≤ 0.15 at 30 °C in dynamic viscoelasticity measurement and a maximum peak temperature of the loss tangent of ≥ 30 °C and ≤ 100 °C.SELECTED DRAWING: Figure 1

The purpose of the present disclosure is to provide a sealing sheet, a display panel, and a method for manufacturing a display panel, said sealing sheet being not susceptible to adhesion to an LED element, being easy to change the placement position, being not susceptible to appearance defects, and being not susceptible to voids in the bottom surface or corners of a recess. A sealing sheet for sealing light-emitting elements for a display using a plurality of light-emitting elements as light sources, the sealing sheet being provided with a first film, a resin composition layer for forming a sealing layer, and a second film in this order, the surface roughness Ra of the resin composition layer on the surface in contact with the first film is 0.02 [mu] m or more, the glass transition temperature of the resin composition layer as determined by dynamic viscoelasticity measurement in a torsional mode at a frequency of 1 Hz is 20 DEG C or more, and the loss tangent (tan [delta] 100) at 100 DEG C is 0.2 or more.

An adhesive sheet which is formed from an adhesive composition containing a (meth) acrylic copolymer (A) that has a structural unit derived from a monomer M that generates an active species excited by irradiation with an active energy ray, and which satisfies the following requirements (1) and (2). Condition (1): the storage shear modulus (G '(-20 DEG C)) at-20 DEG C as determined by dynamic viscoelasticity measurement in a shear mode at a frequency of 1 Hz is 10 kPa or more and 1000 kPa or less, and Condition (2): the maximum strain value (gamma max) when a stress of 2 kPa is applied at 60 DEG C for 600 seconds is less than 80%.

This resin composition contains a urethane (meth)acrylate, a monofunctional (meth)acrylate, and a radical photopolymerization initiator. The urethane (meth)acrylate is a reaction product of: a polyol component that contains a specific polypropylene glycol; a polyisocyanate component that contains at least one of an alicyclic polyisocyanate and an aliphatic polyisocyanate; and a hydroxyl group-containing (meth)acrylate. In the dynamic viscoelasticity measurement of a cured product of the resin composition, there are two or more specific peaks of the loss factor tanδ.

An electrostatic charge image developer contains a carrier and a toner, in which the carrier has magnetic particles, a resin coating layer that coats the magnetic particles, and inorganic particles contained in the resin coating layer, and in a case where an element ratio of metals and metalloids, that constitute the inorganic particles, is analyzed by X-ray photoelectron spectroscopy in a depth direction, and the element ratio at 0 seconds of etching is defined as A and the element ratio at 300 seconds of etching is defined as B, a value of B−A is 0.5 atm % or more and 3.0 atm % or less; and the toner contains toner particles, and in a dynamic viscoelasticity measurement of the toner particles in a case where a temperature is raised from 30° C. to 120° C., a minimal value tan δ(min) of a loss tangent is present at 50° C. or higher and 80° C. or lower and is 0.50 or more and 1.00 or less.