摘要:
The use of a certain copolymer is described for reducing the gas-permeability of rubber material. A rubber material provided with a barrier material in the form of the copolymer is also described. The copolymer can be produced via ring-opening metathesis polymerization of a) one first olefin monomer selected from the group consisting of cyclic olefin monomers having at least one endocyclic C-C double bond, where no tertiary carbon atom bearing a hydrogen atom is present in alpha-position to the double bond, and b) one second olefin monomer selected from the group consisting of cyclic olefin monomers having one endocyclic C-C double bond, where a tertiary carbon atom bearing a hydrogen atom is present in at least one alpha-position to the double bond, where the copolymer has been oxidized at least to some extent, where the amount of polycyclic olefin monomers used to produce the copolymer with at least two C-C double bonds is zero or less than 1 mol%, based on the entirety of the monomers.
摘要:
A composite of a resin member bonded to a vulcanized rubber member is obtained with using a rubber member vulcanized with a radical-generating agent (e.g., an organic peroxide) and a thermoplastic resin having at least 2 atoms, on average, selected from H and S atom per molecule, each atom having not less than 0.006 of an orbital interaction energy coefficient S represented by the following formula (1): S = C HOMO , n 2 / E C - E HOMO , n + C LUMO , n 2 / E C - E LUMO , n wherein E c :an orbital energy (eV) of a radical, C HOMO , n :a molecular-orbital coefficient of a highest occupied molecular orbital (HOMO) of an n-th H or S atom constituting a basic unit of the resin, E HOMO,n :an orbital energy (eV) of the HOMO, C LUMO,n :a molecular-orbital coefficient of a lowest unoccupied molecular orbital (LUMO) of the n-th H or S atom constituting the basic unit of the resin, E LUMO,n : an orbital energy (eV) of the LUMO, and above all represent a value calculated by a semiempirical molecular orbital method MOPACPM3. The thermoplastic resin includes a polyamide, a polyester, a PPE, a POM, a PPS, a polyolefinic resins, and the unvulcanized rubber may comprise a vulcanization-activating having plural polymerizable unsaturated bonds. The invention gives the composite of the resin bonded directly to the rubber firmly without adhesives in wide combinations of the resin and the rubber.
摘要:
A rubber-reinforcing cord (12) as a rubber-reinforcing member of the present invention is a rubber-reinforcing member for reinforcing a rubber product (such as a toothed belt (1)). The rubber-reinforcing cord (12) includes a reinforcing fiber or a reinforcing fiber sheet, and a first coating film provided on a surface of the reinforcing fiber or a surface of the reinforcing fiber sheet. The first coating film is formed by applying a first treatment agent containing polyvinyl alcohol and a crosslinking agent to the reinforcing fiber or the reinforcing fiber sheet and drying the first treatment agent. In the reinforcing member of the present invention, a second coating film as a primary coating film may be provided on the surface of the reinforcing fiber or the surface of the reinforcing fiber sheet. The second coating film can be produced using a second treatment agent containing a rubber latex, for example.
摘要:
The invention concerns an article for protecting the user from risks associated with the handling of chemicals, and comprising: (i) at least one inner layer of a material selected among natural and synthetic latexes; (ii) at least one partly hydrolyzed polyvinyl alcohol (PVA) layer, having an hydrolysis rate ranging between 70 and 95%; (iii) at least one self-crosslinking synthetic latex layer.
摘要:
A new and improved tier sheet comprises a three-layer laminated extrusion comprising outer layers of a suitable polypropylene homopolymer, and an inner core layer comprising a suitable polypropylene copolymer blended with a suitable elastomer selected from the group comprising SANTOPRENE®, KRATON®, ethyl vinyl acetate (EVA) , and a thermoplastic olefin (TPO) . By effectively incorporating the elastomer into the inner core layer of the three-layer laminated extrusion, the tier sheet is provided with the requisite amount of softness, elasticity, and resiliency so as to not only permit the multiplicity of cans to, in effect, form sufficiently deep impressions or depresssions within the upper and lower tier sheets as the different tiers or layers of tier sheets and cans are disposed upon the transportation pallet within the tiered array comprising the palletized load such that movement of the individual cans with respect to the upper and lower tier sheets will effectively be restricted and prevented but, in addition, the tier sheet can dimensionally recover whereby the depressions and impressions will effectively disappear so as to thereby enable each tier sheet to be readied for use with respect to supporting and restraining new or additional sets of cans in connection with the formation of subsequent palletized loads. Furthermore, the outer layers will not readily delaminate from the inner core layer, and still further, the extrusion process results in the fact that the edge portions of the three-layer laminate are effectively sealed such that the three-layer tier sheet laminate will not readily absorb moisture.
摘要:
A composite which is composed of a combination of a cured rubber member having been cured with a radical generator and a resin member comprising a thermoplastic resin which contains a hydrogen atom or a sulfur atom having an orbital interaction energy coefficient (S) represented by the following formula (1) of 0.006 or more in an total amount of at least two atoms in one molecule thereof on average. (1) The composite provides, in a wide range of the combination of a resin and a rubber, a composite wherein the resin and the rubber are joined directly and strongly with each other without the aid of an adhesive.
摘要:
A method of making a fender protective structure having a layer of resilient plastic/elastomer alloy having a delayed elastic response, comprising providing a mold, placing elastomer spacers in the mold, adding the plastic and elastomer to the mold under heat and pressure, and opening the mold and removing the spacers to create voids the alloy.