40results about How to "Good rigidity balance" patented technology

In a straddle type vehicle having front forks, the left front fork is in an elliptical shape portion whose axial cross section is formed so as to be wider in the width direction of the vehicle as compared to a length in the front and rear direction at the portion located in front of the brake caliper. The brake caliper is disposed so as to be overlapped with the elliptical shape portion, viewed from the front direction of the vehicle.

There is provided a pneumatic radial tire for a motorcycle capable of developing an excellent steering stability in a high-speed cornering subjected to a large camber angle, and having an aspect ratio of 0.50–0.85, in which a tensile strength at break of a carcass ply cord is not less than 980 MPa, and an absolute value of a carcass total rigidity obtained by adding carcass rigidities of carcass plies is not less than 30000, and a tensile strength at break of a belt layer cord is not less than 2350 MPa, and an absolute value of a belt total rigidity obtained by adding belt rigidities of belt layers is not less than 170000, and a bending rigidity ratio as a ratio of out-of-plane bending rigidity to in-plane bending rigidity is within a range of 4.20–9.10.

A pneumatic tire has an upper surface sipe formed on an upper surface of the block, a first wall surface sipe formed in a first wall surface of the block and extending in a direction intersecting the upper surface sipe, and a second wall surface sipe formed in a second wall surface which is adjacent to the first wall surface, and extending in a direction intersecting the upper surface sipe and the first wall surface sipe.

A pneumatic tire has an upper surface sipe formed on an upper surface of the block, a first wall surface sipe formed in a first wall surface of the block and extending in a direction intersecting the upper surface sipe, and a second wall surface sipe formed in a second wall surface which is adjacent to the first wall surface, and extending in a direction intersecting the upper surface sipe and the first wall surface sipe.

The invention discloses a high-modulus and ultrahigh-impact polypropylene composite material and its preparation method. The composite material comprises 40-74wt% of polypropylene, 10-30wt% of an ultrafine inorganic filler, 15-30wt% of an elastomer flexibilizer, 0.1-2wt% of a stabilizer, and 0-5wt% of other additives. The preparation method comprises the following steps: carrying out dry mixing on raw materials in a high speed mixer for 3-15min, adding the mixed raw materials into a double screw extruder, carrying out melt extrusion, and carrying out cooling granulation. The preparation method has the following advantages:1, a ethylene-butylene copolymer is used as the elastomer flexibilizer, so the polypropylene composite material has better low temperature toughness than traditional toughening modified polypropylene; 2, ultrafine talcum powder is used as the inorganic filler, so the toughness loss can be reduced as much as possible, and the rigidness of the material is greatly improved; and 3, the synergistic effect of the ultrafine talcum powder and the elastomer flexibilizer is utilized, so the polypropylene composite material has more ideal rigidness-toughness balance than the traditional toughening modified polypropylene.

A pneumatic tire has a plurality of upper surface sipes formed on an upper surface of the block and arranged in parallel so as to be spaced in a sipe width direction, and a wall surface sipe extending along a tire diametrical direction in a wall surface positioned in a longitudinal direction of the upper surface sipe. The wall surface sipe is arranged between a pair of adjacent the upper surface sipes.

A pneumatic tire structured such that a sipe is formed in a land portion of a tread surface. The sipe has a wide portion extending along a longitudinal direction at least at one position in a depth direction. The wide portion is structured by alternately arranging concave portions which are smaller in the longitudinal direction and the depth direction than the sipe, in both sides of a sipe wall surface along the longitudinal direction of the sipe.

A rubberized fiber material is used in a belt reinforcing layer of a pneumatic tire, and comprises polyketone fibers having substantially a repeat unit represented by the following formula (I):(wherein A is a moiety derived from an ethylenically unsaturated compound polymerized through ethylenic linkage, and may be same or different in repeat units) and a coating rubber covering the fibers, in which the coating rubber has a modulus at 100% elongation (room temperature) of not less than 2.5 MPa but not more than 5.5 MPa and a rebound resilience of not less than 60%. Also, a pneumatic tire comprises a belt reinforcing layer made from the rubberized fiber material.

The application discloses an industrial production method and device for a highly isotactic polybutylene alloy. The production method comprises the following steps: firstly polymerizing propylene in a prepolymerization kettle at -20 to 90 DEG C to form polypropylene particles loaded with active centers, carrying out reduced pressure recovery on the unreacted propylene monomer into a propylene monomer gas cabinet, putting polypropylene loaded with active centers and 1-butene monomer into the polymerization kettle and polymerizing at -10 to 80 DEG C to obtain a granular polybutene alloy, removing partial unreacted monomer under reduced pressure, feeding the materials in the prepolymerization kettle into a flash kettle to further remove unreacted 1-butene, sequentially introducing nitrogen into the flash kettle for replacing air, discharging the granular isotactic polybutene alloy from a discharge valve arranged at the bottom of the kettle, extruding and packaging. The production device comprises a batching system, a polymerization system, a post-treatment packaging system, a vacuum nitrogen system, a degassing flash system and a utility system. By the method and the device, the industrialized synthesis of the polybutylene alloy can be achieved and the method has the advantages of no organic solvent and no waste emissions and belongs to the scope of environment-friendly clean production.

The invention discloses a transparent antistatic resin composition for IC packaging tubes, which comprises the following components in parts by weight: 20-78 parts of methyl methacrylate-styrene resin, 20-78 parts of styrene-butadiene copolymer 1-5 parts and antistatic agent. The transparent antistatic IC packaging tube resin composition of the present invention adopts methyl methacrylate-styrene (MS) as matrix resin, and uses styrene-butadiene copolymer (SBC, also known as K glue) as toughening Toughening agent, it has a good rigidity-tough balance, adding antistatic agent, the obtained resin composition has better transparent effect and antistatic effect.

The present invention relates to the field of polymers, particularly to a polypropylene composition, a polypropylene material, and applications of the polypropylene composition and the polypropylene material, wherein the polypropylene composition contains, by weight, 64-90% of random co-polypropylene, 9-35% of a polyolefin elastomer, and 0.2-1.5% of an antioxidant. According to the present invention, the polypropylene material has advantages of good fluidity, good shrinkage, rigidity and toughness balance, heat aging resistance and environmental aging resistance, and cannot produce stress whitening after bending 90 DEG; and the polypropylene composition and / or the polypropylene material are particularly suitable for the preparation of pot seedling cultivation disks.

The invention provides a composite auxiliary agent for a high density polyethylene overpressure resistant tubing. The composite auxiliary agent comprises 30-50 parts by weight of a long-term ageing resistant auxiliary agent , 10-30 parts by weight of a thermal stable auxiliary agent, and 10-30 parts by weight of a processing auxiliary agent, wherein the long-term ageing resistant auxiliary agent is at least one selected from a group consisting of hindered phenols antioxidants, amines antioxidants, and phosphorus antioxidants; the thermal stable auxiliary agent is at least one selected from metal soap stabilizers; and the processing auxiliary agent comprises at least a fluoroelastomer. The invention also provides a preparation method of the composite auxiliary agent, and a high density polyethylene overpressure resistant tubing resin raw material containing the composite auxiliary agent. The high density polyethylene overpressure resistant tubing resin raw material containing the composite auxiliary agent has excellent processing performance. The formed tubing has excellent environmental stress crack resistance, ageing resistance, and rigidity-toughness balance.