The present disclosure provides a process for preparing a cured transparent rubber composition containing a synthetic isoprene polymer(s), a transparent polymer(s), a curing agent and additives. The process includes mixing the components at a temperature ranging from 50 to 130° C., curing the compound with peroxide and allowing the compound to mature. The maturated compound is fed to an injection molding machine. The cured transparent rubber composition prepared using the methods described herein has a haze of less than 30% and a total light transmission of more than 80%. The disclosure further provides an article including the cured transparent rubber composition, in particular for medical applications and artificial nipples.

A matrix material dispersed with one or more susceptor structures can be formed into a feedstock for an additive manufacturing process. The one or more susceptor structures can be excited by an energy field such as an electric field, a magnetic field, an electromagnetic field, or any combination thereof, to produce heat. The heat that is produced can be transferred to the matrix material that surrounds the one or more susceptor structures to provide heat treatment to the matrix material. The heat treatment can improve the material and mechanical properties of three dimensional objects formed from the feedstock.

The present invention provides a composition for 3D printing, a process for preparing the same and an article thereof. By the solidifying method of UV irradiation, 3D printing is implemented. During said implementation, there is no need of high temperature heating, thus energy consumption is reduced, and there is no need for special solvent, thus harm to the environment is reduced. Meanwhile, the present invention uses micro-nano powder as the main material and polymer resin as adhesive, and at the same time, adds irradiation sensitizer. After electron beam irradiation, the polymer resin forms three-dimensional crosslinked network, thereby the strength, heat resistance and chemical resistance are improved after resin adhesion. Additionally, the present invention, by the addition of UV crosslinking agent, and by UV irradiation, cross-links the unsaturated resin after extrusion in 3D printing to form three-dimensional network structure, thus greatly improves the heat resistance, chemical resistance and mechanical strength of the shaping material, and makes the unsaturated resin have broader application prospects in 3D printing material.

Provided are: a rubber composition for treads which contains a diene rubber in the rubber component and can simultaneously achieve blowing resistance during dry running, wet grip performance and abrasion resistance; and a pneumatic tire including a tread formed from the rubber composition for treads. The rubber composition contains: a diene rubber including styrene-butadiene rubber; zinc dithiophosphate; an inorganic filler including at least one selected from the group consisting of: a compound of the formula: mM.xSiO.sub.y.zH.sub.2O wherein M represents at least one metal selected from the group consisting of Al, Mg, Ti, Ca, and Zr, or an oxide or hydroxide of the metal, m represents an integer of 1-5, x represents an integer of 0-10, y represents an integer of 2-5, and z represents an integer of 0-10; magnesium sulfate; and silicon carbide, and having a BET value of 5-120 m.sup.2/g and a linseed oil absorption of 30-80 mL/100 g; and sulfur, wherein, per 100 parts by mass of the diene rubber, there are 0.2-15 parts by mass of the zinc dithiophosphate, 1-70 parts by mass of the inorganic filler, and less than 2.5 parts by mass of zinc oxide.

Provided are: a rubber composition for treads which contains a diene rubber in the rubber component and can simultaneously achieve blowing resistance during dry running, wet grip performance and abrasion resistance; and a pneumatic tire including a tread formed from the rubber composition for treads. The rubber composition contains: a diene rubber including styrene-butadiene rubber; zinc dithiophosphate; an inorganic filler including at least one selected from the group consisting of: a compound of the formula: mM.xSiO.sub.y.zH.sub.2O wherein M represents at least one metal selected from the group consisting of Al, Mg, Ti, Ca, and Zr, or an oxide or hydroxide of the metal, m represents an integer of 1-5, x represents an integer of 0-10, y represents an integer of 2-5, and z represents an integer of 0-10; magnesium sulfate; and silicon carbide, and having a BET value of 5-120 m.sup.2/g and a linseed oil absorption of 30-80 mL/100 g; and sulfur, wherein, per 100 parts by mass of the diene rubber, there are 0.2-15 parts by mass of the zinc dithiophosphate, 1-70 parts by mass of the inorganic filler, and less than 2.5 parts by mass of zinc oxide.

A latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex having pKa of 9.5 to 10.2 and satisfying General Formulas 1 and 2.

0.85≤P≤1.0, P=CV.sub.D/CV.sub.0  [General Formula 1]

5≤M≤20, M=m.sub.1×m.sub.2  [General Formula 2] wherein CV.sub.0 represents a capillary viscosity which is measured in a swollen in a methyl ethyl ketone solvent, CV.sub.D represents a capillary viscosity in a deswollen state, m.sub.1 represents an insolubility of a dried film in the methyl ethyl ketone solvent, and m.sub.2 represents a swelling index of the dried film in the methyl ethyl ketone solvent, wherein a carboxylic acid-modified nitrile-based copolymer of carboxylic acid-modified nitrile-based copolymer latex includes: a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit. A molded article having a layer derived from the latex composition is also provided.

Thermally vulcanisable, meltable adhesives and processes have a meltable polybutadiene-polyurethane, ground sulphur and optionally at least one vulcanisation accelerator, at least one filling material, at least one epoxide resin, at least one tackifier resin, bitumen, at least one softener and further auxiliary and additive materials, wherein said adhesives and processes can be thermally vulcanised within a temperature range of 130° C. to 230° C., such that same, as well as an adhesive strip produced from same, can be used for adhesion and/or sealing in the automotive industry, as well as in structural work on oiled sheet metal, and in the painting line on e-coated or otherwise painted sheet metal, for example, for crimp fold adhesion, for crimp fold sealing, for seam sealing, for lining adhesion, for hole closure and much more.

Thermally vulcanisable, meltable adhesives and processes have a meltable polybutadiene-polyurethane, ground sulphur and optionally at least one vulcanisation accelerator, at least one filling material, at least one epoxide resin, at least one tackifier resin, bitumen, at least one softener and further auxiliary and additive materials, wherein said adhesives and processes can be thermally vulcanised within a temperature range of 130° C. to 230° C., such that same, as well as an adhesive strip produced from same, can be used for adhesion and/or sealing in the automotive industry, as well as in structural work on oiled sheet metal, and in the painting line on e-coated or otherwise painted sheet metal, for example, for crimp fold adhesion, for crimp fold sealing, for seam sealing, for lining adhesion, for hole closure and much more.

Sequential, double elastomer vulcanization method, system, and composition. First and second immiscible elastomers are mixed together with a first additive package. A first curative system is activated to vulcanize the first elastomer in a dispersed phase of the first elastomer to form a partially vulcanized mixture while maintaining melt flowability of the second elastomer in a continuous phase. Then, a second curative system is activated to vulcanize the second elastomer in the continuous phase. Since the partially vulcanized mixture is melt processable, a second additive package can be introduced to the mixture after activating the first curative system. Or, the second curative system can be activatable at a temperature which is higher than an activation temperature of the first curative system. In this manner, blends of dissimilar elastomers can be vulcanized with independent control of plasticizer, filler and curative distribution.

Sequential, double elastomer vulcanization method, system, and composition. First and second immiscible elastomers are mixed together with a first additive package. A first curative system is activated to vulcanize the first elastomer in a dispersed phase of the first elastomer to form a partially vulcanized mixture while maintaining melt flowability of the second elastomer in a continuous phase. Then, a second curative system is activated to vulcanize the second elastomer in the continuous phase. Since the partially vulcanized mixture is melt processable, a second additive package can be introduced to the mixture after activating the first curative system. Or, the second curative system can be activatable at a temperature which is higher than an activation temperature of the first curative system. In this manner, blends of dissimilar elastomers can be vulcanized with independent control of plasticizer, filler and curative distribution.