33results about How to "Good rubber elasticity" patented technology

The present invention relates to a block copolymer (A) including a (meth)acrylic polymer block (a) and an acrylic polymer block (b). The (meth)acrylic polymer block (a) is preferably copolymerized with a monomer having a functional group having high cohesive force, such as a carboxyl group, so that the 5%-weight-loss temperature is 300° C. or more or the tensile strength is 3 MPa or more, and the hardness measured by a type A durometer according to JIS K6253 is 50 or less, and a compression set measured after 22 hours at 70° C. is 45% or less. The block copolymer (A) exhibits excellent thermal decomposition resistance and low compression set at high temperatures. The block copolymer (A) can be used as a soft material for automobile, and has low hardness, high adhesion, high oil resistance, high weather resistance, high heat resistance, high recycling property, high tensile properties, and high wax remover resistance.

A curable resin composition includes (A) a cationically polymerizable-compound, (B) a cationic photopolymerization initiator, and (C) an epoxidized polyisoprene containing an epoxy group at 0.15 to 2.5 meq / g in the molecule and having a number-average molecular weight of 15000 to 200000. The curable resin composition shows excellent elongation properties and high break elongation even in a cured state and can give a cured product having superior compatibility, transparency, flexibility and waterproofness. Accordingly, the composition is suitable for use as adhesives, coating agents, encapsulating materials, inks, sealing materials and the like.

A RTV organopolysiloxane composition comprising (A) an organopolysiloxane containing at least two Si—OH or organoxy radicals and having a viscosity of at least 500 mPa-s at 25° C., (B) an organosilane containing at least two organoxy radicals, (C) an organotin catalyst, and (D) an Si—OH radical-containing organopolysiloxane having a viscosity of up to 300 mPa-s at 25° C. It has shelf stability and discoloration resistance in the uncured state and exhibits rubber elasticity and adhesion in the cured state.

The object of the present invention is to provide a thermoplastic elastomer composition having a good balance between the hardness and the mechanical strength, exhibiting superior rubber elasticity, high-temperature creep characteristics and formability in a wide range of temperature, and having oil resistance and heat resistance. The thermoplastic elastomer composition comprises (A) (meth)acrylic block copolymer; (B) a compound containing at least two amino groups in its molecule; and (C) a thermoplastic resin. The (meth)acrylic block copolymer (A) comprises (A1) a (meth)acrylic copolymer block and (A2) an acrylic copolymer block. A1 least one of the polymer blocks has at least one acid anhydride group. The (meth)acrylic block copolymer (A) and the compound (B) are dynamically vulcanized in the thermoplastic resin (C).

A thermoplastic elastomer composition comprising the following components [A], [B], [C], and [D]: [A] 5 to 60 mass % of an ethylene-α-olefin-based copolymer having a limiting viscosity of 3.5 dl / g or more measured in a decalin solvent at 135° C., [B] 1 to 20 mass % of a polyolefin-based resin, and [C] 30 to 94 mass % of a mineral oil-based softening agent, provided that the total of the components [A], [B], and [C] is 100 mass %, and for 100 parts by mass of the components [A], [B], and [C], [D] 0.1 to 50 parts by mass of a hydrogenated diene-based polymer, at least [A] the ethylene-α-olefin-based copolymer and [B] the polyolefin-based resin being dynamically treated with heat in the presence of a cross-linking agent, or the above thermoplastic elastomer composition wherein [A] is replaced with an oil-extended rubber comprising [A1] 20 to 80 mass % of an ethylene-α-olefin-based copolymer having a limiting viscosity of 3.5 dl / g or more measured in a decalin solvent at 135° C. and [C1] 20 to 80 mass % of a mineral oil-based softening agent, provided that the total of [A1] and [C1] is 100 mass %. This thermoplastic elastomer composition excels in molding processability, has low hardness, is free from bleed-out of a mineral oil-based softening agent, has high flexibility and superior rubber elasticity (rebound resilience and compression set), and excels in recycling efficiency.

A thermoplastic elastomer composition that exhibits excellent rubber elasticity, etc. is obtained by dynamically heating a polymer composition in the presence of the crosslinking agent, the polymer composition including an α-olefin thermoplastic resin (A), and an oil-extended ethylene copolymer (B) that includes an ethylene copolymer that satisfies given conditions, and 50 to 150 parts by mass of a first mineral oil-based softener based on 100 parts by mass of the ethylene copolymer, the content of the oil-extended ethylene copolymer (B) being 30 mass % or more based on the total amount (=100 mass %) of the polymer component including the α-olefin thermoplastic resin (A) and the oil-extended ethylene copolymer (B).

In order to prevent any surface swelling, resulting from bleeding of a low molecular weight compounding agent contained in rubber, a cushioning pad for hot pressing has a rubber sheet 1, and a surface layer material 2 made of a porous heat-resistant resin film laminated on at least one face of rubber sheet 1. The porous film has an average pore diameter of 10 μm or less and the porous film has gas permeability of 0.1 cm3 / cm2·sec or more.

A process for production of a thermoplastic elastomer composition by melt-kneading a mixture in one step to thereby conduct dynamic crosslinking, wherein the mixture comprises a hydrogenated block copolymer (a1) which is prepared by hydrogenating a block copolymer comprising a vinyl aromatic polymer block (A1) and a conjugated diene polymer block (B1) and has number-average molecular weight of 200000 or above and, if necessary, a non-hydrogenated block copolymer (a2) comprising a vinyl aromatic polymer block (A2) and a conjugated diene polymer block (B2), and contains a non-aromatic rubber softening agent (b), a peroxide-crosslinkable olefin resin (c) having a density of 0.94 g / cm3 or above, a peroxide-decomposable olefin resin (d), an organic peroxide (e), and a crosslinking aid (f), the amount of (b) being 50 to 250 parts by mass per 100 parts by mass of the sum of (a1) +(a2), the amount of (c) being 2.5 to 50 parts by mass per 100 parts by mass of (a); and the amount of (d) being 0.5 to 10 times that of (c) by mass.

Objects of the invention are to obtain ethylene copolymers which have excellent rubber elasticity even without being crosslinked and maintain sufficient shaping processability even when filled with significantly large amounts of additives, and to provide methods for producing with good productivity films or sheets having flexibility and high stretchability. The invention is directed to an ethylene copolymer (X) including structural units derived from a component [A], a component [B] and a component [C] which are ethylene [A], an α-olefin of 3 to 20 carbon atoms [B] and a polyene and / or a cyclic olefin [C]. In the ethylene copolymer, (1) the content of structural units derived from the ethylene [A] is in the range of 50 to 90 mol % in 100 mol % of all the structural units in the copolymer (X); (2) the content of structural units derived from at least one polyene and / or the cyclic olefin [C] is in the range of 1.0 to 5.0 mol % in 100 mol % of all the structural units in the copolymer (X); and (3) the intrinsic viscosity [η] of the ethylene copolymer (X) as measured at 135° C. in a decalin solution is in the range of 7.8 to 13.0 dl / g. The invention also concerns with a composition including the ethylene copolymer (X), and uses.

The invention relates to the technical field of novel materials, in particular to a mud-resistant cable sheath rubber material. The mud-resistant cable sheath rubber material is prepared from, by weight, 100 parts of levapren rubber, 2.5-6.5 parts of vulcanizing agents, 0.5-1.5 parts of accelerant, 90-145 parts of fire retardant, 1.0-2.0 parts of release agents, 1.0-2.0 parts of stearic acid, 0.5-1.0 part of anti-aging agents, 1.5-2.0 parts of coupling agents, 1.5-13.5 parts of plasticizer and 5.0-10.0 parts of reinforcing filler. The prepared mud-resistant cable sheath rubber material has excellent rubber elasticity and good crack resistance and is applicable to drilling platforms.

The invention discloses a metal weaving type conductive silica gel sleeve and a preparation method thereof. The conductive silica gel sleeve comprises a core, a binding layer and an electromagnetic shielding layer which are sequentially arranged from inside to outside, the core is a pipe formed by extruding high-elasticity silicone rubber by an extrusion machine, the binding layer is a high-strength organic silicon binding layer coated on a surface of the core, the thickness of the binding layer is 0.05-0.1 millimeter, and the electromagnetic shielding layer is a metal weaving layer combined onto the surface of the core by the binding layer. By the metal weaving layer on the surface, the volume resistivity of the conductive silica gel sleeve is small, and the surface resistance is lower tobe 10 milliohms; with the core formed by extruding the high-elasticity silicone rubber, the conductive silica gel sleeve has very good rubber elasticity, and the permanent deformation rate after compression is lower to be 5%; and by combining the core and the metal weaving, the weight of the conductive silica gel sleeve is reduced by 20% compared with the same-volume metal shielding pipe.

A curable composition according to the present invention is characterized by comprising (A) a polyalkylene oxide having a hydrolysable silyl group, (B) an acrylic polymer having a hydrolysable silyl group and (C) an alkoxysilane oligomer which is a hydrolytic condensation product of an alkylalkoxysilane with an aminoalkoxysilane and has a nitrogen atom content of 1 wt% or more.

The invention provides a thermoplastic elastomer composition that has an excellent balance between flexibility and heat resistance (creep resistance), shows little tackiness (stickiness) and is not deteriorated in design properties even when exposed to a high temperature.A thermoplastic elastomer composition (X) includes a propylene copolymer (A) satisfying all the requirements (A1) to (A3) described below, a crystalline polyolefin polymer (B) which is optional, and a styrene block copolymer (C). (A1) The Shore A hardness is in the range of 50 to 90. (A2) The copolymer gives a melting peak Tm in the range of 30 to 95° C., and the endothermic enthalpy ΔH corresponding to the melting peak is in the range of 1.0 to 20 J / g. (A3) The molecular weight distribution Mw / Mn is in the range of 1.2 to 3.0.

A curable composition includes (A) a (meth)acrylate, (B) a radical polymerization initiator, (C) an epoxidized polyisoprene containing an epoxy group at 0.15 to 2.5 meq / g in the molecule and having a number-average molecular weight of 15000 to 200000, and (D) a curing accelerator. The curable composition shows high elongation and excellent rubber elasticity even in a cured state and has superior compatibility, transparency, waterproofness and flexibility, so that cracks and separation of cured products are reduced. Accordingly, the composition is suitable for use as adhesives, coating agents, encapsulating materials, inks, sealing materials and the like.

A first thermoplastic elastomer composition which comprises 100 parts by mass of the sum of 5 to 60 mass % of [A] an ethylene.alpha-olefin based copolymer having a limiting viscosity of 3.5 dl / g or more as measured in a decalin solvent at 135 DEG C, 1 to 20 mass % of [B] a polyolefin based resin and 30 to 94 mass % of [C] a mineral oil based softening agent (provided that the sum of [A], [B] and [C] is 100 mass %), and 0.1 to 50 parts by mass of a hydrogenated diene based polymer, wherein at least the above [A] an ethylene.alpha-olefin based copolymer and [B] a polyolefin based resin have been subjected to a dynamic heat treatment in the presence of a cross-linking agent; or a second thermoplastic elastomer composition obtained by substituting [A] component of the first thermoplastic elastomer composition with an oil-extended rubber consisting of 20 to 80 mass % of [A1] an ethylene.alpha-olefin based copolymer having a limiting viscosity of 3.5 dl / g or more as measured in a decalin solvent at 135 DEG C and 20 to 80 mass % of [C1] a mineral oil based softening agent (provided that the sum of [A1] and [C1] is 100 mass %). The above thermoplastic elastomer composition is excellent in processability, has a low hardness, is free from the bleeding of a softening agent such as a mineral oil, has softness, is excellent in rubbery elastic properties (rebound, compression set) and further can be recycled.

The present invention is a thermoplastic elastomer composition which is obtained by dynamically crosslinking an ethylene / Alpha-olefin / non-conjugated polyene copolymer (A), a polyolefin resin (B), 1-200 parts by mass of a softening agent (C) per 100 parts by mass of the total of the copolymer (A) and the resin (B), and a crosslinking agent (D) with use of a batch mixer under conditions satisfying the following conditions (1)-(4). (1) 50 <=P1 <=300 (In this connection, P1 is defined by formula (i). P1 = Gamma ave. * Log(t1) (i) (In formula (i), t1 represents the retention time (sec) after the introduction of the crosslinking agent (D), and Gamma ave. represents the average rate (sec-1) of the shear rates Gamma at t1.)) (2) 900 <=P2 <=1450 (In this connection, P2 is defined by formula (ii). P2 = (Tave. + 273) * Log(t1) (ii) (In formula (ii), Tave. represents the average resin temperature (DEG C) after the introduction of the crosslinking agent (D), and t1 represents the retention time (sec) after the introduction of the crosslinking agent (D).)) (3) -2.5 <=P3 <=1.5 (In this connection, P3 is defined by formula (iii). P3 = Log(t1 / t2) (iii) (In formula (iii), t1 represents the retention time (sec) after the introduction of the crosslinking agent (D), and t2 represents the time (sec) necessary for the residual amount of the crosslinking agent (D) to be 1 ppm or less of the introduced amount thereof at the average resin temperature Tave. after the introduction of the crosslinking agent (D).)) (4) The crosslinking agent (D) is introduced into a batch mixer after the introduction of the ethylene / Alpha-olefin / non-conjugated polyene copolymer (A), the polyolefin resin (B) and the softening agent (C). A thermoplastic elastomer composition according to the present invention is able to produce a molded body that has excellent appearance and excellent mechanical properties such as rubber elasticity, while being capable of increasing the melt density and the extrusion amount, thereby improving the productivity.

The invention discloses a method for manufacturing an oven food mould, which comprises the following steps of: a, kneading silicon rubber compound by using a roll mill; b, adding oxides and pigments serving as vulcanizing agents, blending, and taking the obtained product out of the roll mill; c, molding the obtained mixture by an extrusion molding method or an injection molding method. The oven food mould manufactured by the method is mainly used for baking cakes. The mould has the advantages of excellent durability and heat resistance and good demoulding property, and oil or grease or a layer of release paper does not need to be brushed or laid on the inner surface of the mould; in addition, bread raw materials containing lot of sugar and eggs can be easily broken away from the mould after baking.

A filter element, including a filter medium, on which a seal is situated indirectly or directly, which is used for separating the filter intake side from the filter discharge side. The filter medium comprises a fibrous material. The seal is applied indirectly or directly to the filter medium in the extrusion method (FIG. 1).

Provided are a thermoplastic polymer composition having good mold processability, flexibility, rubber elasticity, scratch resistance, abrasion resistance, transparency, ease of coating, and mechanical properties when formed into a sheet or film, a sheet or film produced using the thermoplastic polymer composition, and a multi-layered film. The thermoplastic polymer composition includes (I) a block copolymer having a number average molecular weight of 30,000 to 200,000, or a hydrogenated product thereof, which has a polymer block (A) mainly composed of α-methylstyrene units and a polymer block (B) mainly composed of conjugated diene compound units or isobutylene units, (II) an acryl-based polymer, and (III) a softening agent at a ratio satisfying the formulae (1) and (2) as described in claim 1, and has a sea-island structure in which the components (II) are dispersed in the form of particles in a continuous phase including the component (I), in which the average dispersed particle diameter of the dispersed particles of the components (II) is 200 nm or less, and 35% by mass or more of the dispersed particles have dispersed particle diameters of less than 60 nm.

A thermoplastic crosslinked rubber composition comprising (A) from 1 to 99 parts by weight of a hydrogenated rubber obtained by hydrogenating not less than 50% of total double bonds of at least one homopolymer rubber of a conjugated diene type monomer or a random copolymer rubber consisting of a conjugated diene type monomer unit and an aromatic vinyl monomer unit and (B) from 1 to 99 parts by weight of an olefinic thermoplastic resin, total amount of (A) and (B) being 100 parts by weight, said (A) being partially or completely crosslinked, wherein said (A) is crystalline rubber, having a crystallization temperature in a range of from −50 to 70° C. and a heat quantity of crystallization at peak in a range of from 3 to 100 J / g in differential scanning calorimetry (DSC method).

The invention relates to the technical field of underwear and in particular discloses a kind of improved bra underwires. The improved bra underwires are formed by injecting modified thermoplastic polyurethane elastomer into a mould and then carrying out integral moulding, and relatively dense grooves are accordingly formed in the front and back of the underwires from one end to the other end, so that an inner layer and an outer layer of a bra cup can be closely embedded into the grooves to be connected and fixed with the underwires after being sequentially subjected to glue spraying, cold laminating and mould pressing. The invention also discloses a processing method of the improved bra underwires and a bra product applying the underwires. The improved bra underwires disclosed by the invention is low in cost, a one-time moulding manufacturing process is adopted, environmental protection is realized, resource is greatly saved, and the grooves in the underwires are closely embedded with a bra body, so that the formed bra has good fixity and washing resistance, is difficult to deform, can replace expensive like products and has extremely high marketing value and good economic benefit.

Disclosed is an ionomer which is obtained by reacting metal compound particles having an average particle diameter of not more than 1 [mu]m and a polymer having a structural unit derived from an unsaturated dicarboxylic acid anhydride. Such an ionomer has flexibility and molding workability similar to those of conventional olefin thermoplastic elastomers, while exhibiting good mechanical characteristics, oil resistance and abrasion resistance. In addition, such an ionomer is particularly excellent in tensile break strength and scratch resistance. Also disclosed are a method for producing such an ionomer and an molded article made of such an ionomer.

A silyl group-containing polymer which can be cured quickly and strongly, and from which a cured product excellent in antifouling properties and weather resistance while maintaining favorable rubber elasticity can be obtained, and having the following formula (1):wherein R1: a group having a hydroxyl group(s) removed from a monohydroxy or polyhydroxy compound having t hydroxyl group(s) in its molecule, R2: a bivalent organic group, R3: a C1-20 monovalent organic group which may have a substituent, X: a hydroxyl group or a hydrolysable group, Y: a bivalent group of the following formula (A) or (B), “a”: an integer of from 1 to 3, r: an integer of from 1 to 1,000, and t: an integer of from 1 to 8, provided that when the silyl group-containing polymer of formula (1) has a plurality of Y's in its molecule, the plurality of Y's may be the same or different, and when t is from 2 to 8, a plurality of monovalent groups bonded to R1 may be the same or different:in the formula (A), R4: a C2-8 alkylene group, and in the formula (B), R5: a C2-4 alkylene Group; and its production process.

The present invention provides a curable composition comprising: a polyoxyalkylene (A) having a hydrolyzable silyl group, an acrylic polymer (B) having a hydrolyzable silyl group, and an alkoxysilane oligomer ( C), the alkoxysilane oligomer (C) is a hydrolysis condensate of an alkylalkoxysilane and an aminoalkoxysilane, and the nitrogen atom content is more than 1% by weight.