Showing papers on "Styrene-butadiene published in 1989"
TL;DR: In this paper, the effect of polymer modification on the behaviour of calcium hydroxide in modified mortars was examined and it was concluded that the formation of calcification in polymer-modified mortars is reduced possibly because of the absorption of calcium hyroxide on polymer films formed in the mortars.
47 citations
TL;DR: In this paper, the photo-oxidation of styrene-butadiene copolymer (SBR) was investigated for comparison with the photodynamic properties of various polybutadienes (BR).
46 citations
TL;DR: In this article, the effects of silane coupling agents on styrene-butadiene rubber (SBR)-mica composites have been studied with special reference to the technical properties and polymer-filler interaction.
Abstract: The effects of silane coupling agents on styrene-butadiene rubber (SBR)-mica composites have been studied with special reference to the technical properties and polymer-filler interaction. Silane-treated mica improves polymer-filler interaction, which subsequently enhances the tensile and other technically important mechanical properties. Failure surfaces of tensile, tear, and wear specimens have been examined under scanning electron microscope (SEM) and the fractographs have been correlated with the strength and failure mode of the composites.
32 citations
TL;DR: In this article, the effects of mixing method, blend ratio, loading and type of carbon black and two other vulcanization systems on cure characteristics and mechanical properties were examined, showing that ENR behaves more like SBR than natural rubber.
30 citations
TL;DR: In this paper, modeles du SBR correspondant aux sequences styrene, butadiene et styrene/butadiene are presented. Butadiene is a variant of styrene.
Abstract: Spectres de composes. Modeles du SBR correspondant aux sequences styrene, butadiene et styrene/butadiene
26 citations
TL;DR: In this paper, a method of simply and quickly determining styrene-butadiene (SBR) and isoprene (NR) tire tread rubbers in piled particulate matter on a highway was investigated.
24 citations
Patent•
20 Mar 1989TL;DR: In this article, a crosslinked polysiloxane styrene/butadiene copolymer represented by the formula of FIG. 1 was presented, where m is a number of from about 2 to about 10; n is a many number of numbers from about 10 to about 1,000; k, l, o, p, q, r, s, t, u are weight fraction numbers totaling one with the sum of k+p+r+t being from about 0.35 to about 0.94; the sum l+q+s+u being from
Abstract: A crosslinked polysiloxane styrene/butadiene copolymer represented by the formula of FIG. 1 wherein m is a number of from about 2 to about 10; n is a number of from about 10 to about 1,000; k, l, o, p, q, r, s, t, u are weight fraction numbers totaling one with the sum of k+p+r+t being from about 0.35 to about 0.94; the sum of l+q+s+u being from about 0.05 to about 0.2 and o is from about 0.02 to about 0.5; R is CH2 CH(R'), alkyl-CR" C(O)O and alkylene-CR' C(O)O, where R' is an aromatic or substituted aromatic substituent and R" is hydrogen or an alkyl substituent.
19 citations
TL;DR: A method for simultaneous determination of natural rubber and styrene-butadiene rubber (SBR) tire tread particles in atmospheric dust is described in this article, where the resulting pyrolyzates are separated and detected by a gas chromatograph equipped with dual flame ionization detectors.
19 citations
TL;DR: In this article, the effectiveness of epoxidized styrene-butadiene-styrene (ESBS) block copolymer as a polymeric compatibilizer for the incompatible polystyrene/polyvinyl chloride (PS/PVC) blend was investigated.
16 citations
Patent•
24 Oct 1989TL;DR: A styrene-butadiene composition containing about 0.1 to 10 weight % of a monoester of maleic acid or fumaric acid provides improved bonding strength as mentioned in this paper.
Abstract: A styrene-butadiene composition containing about 0.1 to 10 weight % of a monoester of maleic acid or fumaric acid provides improved bonding strength. In addition, small amounts of a functional monomer can also be included.
16 citations
Patent•
03 Nov 1989
TL;DR: The barrier properties of compositions comprising a stryene-butadiene polymer can be improved substantially by adding from about 05 to 10 percent of a polyethylene type wax to the composition as discussed by the authors.
Abstract: The barrier properties, particularly water vapor transmission rate, of compositions comprising a stryene-butadiene polymer can be improved substantially by adding from about 05 to 10 percent of a polyethylene type wax to the composition
Patent•
06 Jun 1989TL;DR: In this article, non-whiteware ceramic articles having an increased green strength are prepared from slip compositions containing, as an additive, a polyalkylene polyamine or a mixture of a polyethylenepentamine and binder.
Abstract: Non-whiteware ceramic articles having an increased green strength are prepared from slip compositions containing, as an additive, a polyalkylene polyamine or a mixture of a polyalkylene polyamine and binder. An example of such an additive is tetraethylenepentamine or a mixture of tetraethylenepentamine and a styrene butadiene latex.
Patent•
29 Dec 1989TL;DR: In this article, a flexible electrophotographic imaging member including a supporting substrate, a charge generation layer and a charge transport layer, was proposed, containing a homogeneous dispersion of photoconductive particles of trigonal selenium dispersed in a film forming polymer blend of polycarbonate, polyvinylchloride-polyvinylacetate copolymers and a polymeer selected from the group consisting of phenoxy resin, styrene butadiene copolymer and mixtures thereof.
Abstract: A flexible electrophotographic imaging member including a supporting substrate, a charge generation layer and a charge transport layer, the charge generation layer containing a homogeneous dispersion of photoconductive particles of trigonal selenium dispersed in a film forming polymer blend of polycarbonate, polyvinylchloride-polyvinylacetate copolymer and a polymeer selected from the group consisting of phenoxy resin, styrene butadiene copolymer and mixtures thereof. This imaging member may be employed in an electrophotographic imaging process.
Patent•
06 Jun 1989
TL;DR: In this paper, an oil-extended soln-polymerized styrene-butadiene copolymer with restricted microstructure, molecular structure and mol. content is presented.
Abstract: PURPOSE: To obtain an oil-extended copolymer with excellent rubber kneading properties, uniform dispersibility and characteristics of a kneaded rubber compsn. by extending a specified styrene-butadiene copolymer with restricted microstructure, molecular structure and mol.wt. with an oil. CONSTITUTION: An oil-extended soln.-polymerized styrene-butadiene copolymer consisting of 100 pts.wt. base polymer wherein the styrene content is 30-50wt.%; the amt. of vinyl bonds is 20-50%; at least one group among hydroxyl, carbonyl, thiocarbonyl and mercapto groups and an amino group are both incorporated in the molecular chain; the Mooney viscosity is 100-130, and extended with 30-50 pts.wt. oil. As the oil for oil extending, an oil with an arom. content as determined by the Kurtz method of 30% or higher, especially 40-70% is pref. When 30-50 pts.wt. oil with an arom. content of 30% or higher is used, rubber kneading characteristics is extremely good. COPYRIGHT: (C)1991,JPO&Japio
Patent•
27 Oct 1989TL;DR: In this paper, the authors present developer compositions with toner compositions comprised of suspension polymerized styrene butadiene polymers, pigment particles, magnetites, and charge enhancing additives; and carrier components comprised of a carrier core with a coating thereover.
Abstract: Developer compositions with toner compositions comprised of suspension polymerized styrene butadiene polymers, pigment particles, magnetites, and charge enhancing additives; and carrier components comprised of a carrier core with a coating thereover comprised of a polymer mixture with from about 10 to about 90 percent by weight of a first polymer, and from about 90 to about 10 percent by weight of a second polymer, which first and second polymers are not in close proximity in the triboelectric series.
TL;DR: In this article, a modified version of the Leary-Henderson-Williams equilibrium thermodynamic theory is used to predict microstructural properties for tapered poly(styrene-butadiene) diblock copolymers containing a...
Abstract: A modified version of the Leary-Henderson-Williams equilibrium thermodynamic theory is used to predict microstructural properties for tapered poly(styrene-butadiene) diblock copolymers containing a...
Patent•
31 Jan 1989TL;DR: A dispersion polymerization process for the preparation of styrene butadiene polymers with an average particle diameter of from about 0.1 to about 200 microns is described in this article.
Abstract: A dispersion polymerization process for the preparation of styrene butadiene polymers with an average particle diameter of from about 0.1 to about 200 microns, which comprises (1) formation of a homogenous reaction medium, containing styrene and butadiene monomers in the presence of a steric stabilizer and a chain propagating amount of an initiator; and (2) heating said homogeneous reaction medium under pressure permitting polymerization thereby resulting in the formation of insoluble styrene butadiene polymer particles.
Patent•
04 Aug 1989
TL;DR: In this article, a binding agent from the series of carboxylated styrene-butadiene latices is used for hot forming of steel at high temperatures and especially in the production of seamless tubes in so-called multiple pipe mills, in which the lubricant must adhere water resistant to the tool.
Abstract: Lubricant for use in hot forming of steel at high temperatures and especially in the production of seamless tubes in so-called multiple pipe mills, in which the lubricant must adhere water-resistant to the tool. This is achieved by a lubricant containing, besides a solid lubricant and a thickening agent, a binding agent from the series of the carboxylated styrene-butadiene latices.
TL;DR: In this paper, a model is proposed for a process by which it is possible to estimate the separation distance between carbon black particles (or aggregates) and its dependence on the extent of penetration of the liquid.
Abstract: The penetration of organic solvent and its influence on the electrical conductance of pre-extended styrene butadiene (SBR), butadiene (BR), acrylonitrile butadiene (NBR), butyl (IIR), and natural (NR) rubbers are investigated. A model is proposed for a process by which it is possible to estimate the separation distance between carbon black particles (or aggregates) and its dependence on the extent of penetration of the liquid. An empirical formula is suggested to describe the variation of the conductance of rubber composites with swelling time in terms of the interspacing distance.
Patent•
21 Apr 1989
TL;DR: In this paper, the authors used an epoxy resin and a rubber having specific physical proper ties as main components to obtain the title adhesive easily spreadable when pressed with an electrode chip and exhibiting strong adhesive force even to an oily steel plate.
Abstract: PURPOSE:To obtain the title adhesive easily spreadable when pressed with an electrode chip and exhibiting strong adhesive force even to an oily steel plate, by using an epoxy resin and a rubber each having specific physical proper ties as main components CONSTITUTION:The objective adhesive contains (A) an epoxy resin having a solubility parameter (SP) of >=96 (eg bisphenol A-type, cresol novolak-type, polyol-type resin or a resin modified with urethane polymer, etc) and (B) a rubber having an SP value of <=86 (eg styrene butadiene rubber, natural rubber or butyl rubber) as main components The hardener for the component A is those stable at normal temperature and exhibiting activity at 160-220 degC, eg dicyandiamide, dihydrazides or guanidines
Patent•
29 Dec 1989TL;DR: In this article, a charge generating layer for an electrophotographic imaging member is provided containing trigonal selenium and phthalocyanine photoconductive particles dispersed in a film forming polymer binder.
Abstract: A charge generating layer for an electrophotographic imaging member is provided containing trigonal selenium and phthalocyanine photoconductive particles dispersed in a film forming polymer binder. The film forming polymer binder may be a styrene butadiene copolymer having a weight percent styrene to butadiene content of about 85:15 to about 95:5 and a glass transition temperature range of about 50° C. to about 60° C. A process for producing the homogeneous dispersion of photoconductive particles includes separately milling the trigonal selenium particles and the phthalocyanine particles to approprite particle sizes, and dispersing the separately milled particles in the film forming polymer binder.
Patent•
27 Oct 1989TL;DR: A toner composition comprised of pigment particles and a branched polyalkyl/styrene/butadiene copolymer of the following formula is described in this article, where m, n and o are weight fraction numbers.
Abstract: A toner composition comprised of pigment particles and a branched polyalkyl/styrene/butadiene copolymer of the following formula ##STR1## wherein m, n and o are weight fraction numbers, p represents the number of CH 2 groups, R is hydrogen or alkyl, and R' is carbonyloxy or aryl.
TL;DR: In this article, the authors investigated the miscibility of polybutadienes with butadiene-styrene copolymers of varying styrene content and found that the tendency to miscibility increases with decreasing styrene levels.
Abstract: We investigated the miscibility of polybutadienes with butadiene-styrene copolymers of varying styrene content. The methods of optical microscopy, differential scanning calorimetry, and small angle light scattering (SALS) were used. All polymers/copolymers used in this study have equivalent butadiene microstructures. Copolymers with high styrene levels are immiscible with polybutadiene. The tendency to miscibility increases with decreasing styrene content. An upper critical solution temperature is observed with the 23 percent styrene copolymer.
Patent•
29 Sep 1989
TL;DR: In this paper, a polyphenylene oxide with a cross-linking polymer and/or monomer and a ceramic dielectric powder is presented, which is an aluminum oxide based, titanium dioxide based, barium titanate based ceramic, or a mixed powder of two or more thereof.
Abstract: PURPOSE:To obtain a resin substrate, excellent in heat resistance, dimensional stability, etc., having a desired dielectric constant and capable of high-density fine wiring, etc., by blending a polyphenylene oxide with a crosslinking polymer and/or monomer and ceramic dielectric powder. CONSTITUTION:A resin composition obtained by blending (A) 10-95pts.wt. polyphenylene oxide with (B) 5-90pts.wt. crosslinking polymer (e.g., styrene butadiene copolymer) and/or crosslinking monomer (e.g., triallyl isocyanurate or triallyl cyanurate) and (C) ceramic dielectric powder which is an aluminum oxide based, titanium dioxide based, barium titanate based ceramic, etc., or a mixed powder of two or more thereof in an amount of 1,000-10,000pts.wt. based on 100pts.wt. component (A), thermoforming or further laminating the resultant component.
Patent•
17 Feb 1989
TL;DR: In this article, an electrically conductive aqueous emulsion obtained by blending 100pts.wt. acetylene black having 50-150m /g specific surface area, pressure and within 5min hydrophilicity was presented.
Abstract: PURPOSE:To obtain the titled emulsion suitable as electrically conductive adhesives, coatings, etc., by dispersing specific acetylene black having excellent hydrophilicity in an aqueous high polymer emulsion. CONSTITUTION:An electrically conductive aqueous emulsion obtained by blending (A) 100pts.wt. aqueous high polymer emulsion containing one or more of natural rubber latices, styrene butadiene based polymers, etc., as a polymer component with (B) 1-100pts.wt., preferably 3-50pts.wt. acetylene black having 50-150m /g specific surface area, pressure and within 5min hydrophilicity.
Patent•
07 Aug 1989TL;DR: A process for the preparation of whiteware ceramic articles employs an alkylenediamine, such as ethylenediamines, as an additive to increase the green strength of articles prepared by pressing as mentioned in this paper.
Abstract: A process for the preparation of whiteware ceramic articles employs an alkylenediamine, such as ethylenediamine, as an additive to increase the green strength of articles prepared by pressing. Optionally, the additive includes a latex such as a styrene butadiene latex in an amount effective to further improve the green strength of the articles prepared.
TL;DR: In this paper, the die-swell of mica-filled styrene-butadiene rubber has been correlated with the recoverable deformation, elastic energy and shear modulus of the melt at different shear-rate and at various length to diameter ratio of the capillary.
Abstract: Die-swell of mica-filled styrene-butadiene rubber has been correlated with the recoverable deformation, elastic energy and shear modulus of the melt at different shear-rate and at various length to diameter ratio of the capillary. The Reynolds number and power consumption of melt flow have been correlated with the die-swell and shear-rate of the melt flow. The inverse relationship between shear-viscosity and shear-rate will also correlate power consumption with shear viscosity.
Patent•
17 Aug 1989
TL;DR: In this article, a tightly fastening band is used for fastening antiskid studs which are installed on the outer peripheral surface of an automobile tire by vulcanizing a rubber composite where natural rubber, butadiene rubber, styrene butadienes rubber, carbon black and the like are contained at a specific rate, so as to make it a specific 100% modulus.
Abstract: PURPOSE:To facilitate the installation of the tightly fastening band at a low temperature by vulcanizing a rubber composite where natural rubber, butadiene rubber, styrene butadiene rubber, carbon black and the like are contained at a specific rate, so as to make it a specific 100% modulus. CONSTITUTION:A tightly fastening band is used for tightly fastening antiskid studs which are installed on the outer peripheral surface of an automobile tire. In this case, 50-60pts.wt. of carbon black and more than 4pts.wt. of each sulfur and vulcanization accelerator are contained in the rubber composite of the tightly fastening band, while 100pts.wt. of rubber is composed of 50-60 pts.wt. of natural rubber, 30-40pts.wt. of butadiene rubber, and 5-20pts.wt. of styrene butadiene rubber. And also the tightly fastening band is formed by vulcanizing the said composite and setting a 100% modulus to 40kg/cm or more at a room temperature, and to 80kg/cm or less at a low temperature respectively. Consequently, the low temperature performance of the rubber composite is improved and the installation of the tightly fastening band at a low temperature can be facilitated.
TL;DR: In this paper, the effect of sulfanilyl derivatives on the rate of vulcanization of SBR formulations as well as the ageing characteristics of corresponding vulcanizates were evaluated.
Abstract: Styrene-butadiene rubber (SBR) mixtures containing some sulfanilyl derivatives have been prepared. The effect of the latter compounds on the rate of vulcanization of SBR formulations as well as the ageing characteristics of corresponding vulcanizates were evaluated. In all cases, the efficiency of the compounds under investigation was correlated with their chemical structure. It was found that vulcanizates containing sulfanilyl thiourea compounds deteriorate to a lesser degree than those containing N-isopropyl-N'-phenyl-1, 4-phenylenediamine (IPPD) as conventional antioxidant. In addition, the effect of the type of carbon black on the efficiency of such compounds as antioxidants was evaluated.
Patent•
23 May 1989
TL;DR: In this paper, a rubber composition, having excellent low hardness, low creep properties and breakage resistance, etc., and further high damping characteristics by blending specific SBR with carbon black was obtained.
Abstract: PURPOSE: To obtain a rubber composition, having excellent low hardness, low creep properties and breakage resistance, etc., and further high damping characteristics by blending specific SBR with carbon black. CONSTITUTION: A composition, obtained by blending (A) 100 pts.wt. rubber component containing 5-50 pts.wt. styrene butadiene rubber having 5×10 3 to 2×10 5 weight-average molecular weight and 10-50wt.% content of combined styrene with (B) 15-50 pts.wt. carbon black having 25-100mg/g iodine adsorption specific surface area and 50-120cm 3 /100g DBP value and having ≥0.25 tanδ thereof. Natural rubber, butadiene rubber, SBR other than the above-mentioned SBR, etc., are cited as other components in the rubber component. COPYRIGHT: (C)1990,JPO&Japio