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Topic: Polybutadiene

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	Polybutadiene - Wikipedia, the free encyclopedia
		Polybutadiene is a synthetic rubber that has a high resistance to wear and is used especially in the manufacture of tires.
		Polybutadiene is a polymer formed from the polymerization of the monomer 1,3-butadiene.
		Polybutadiene can be formed from many 1,3-butadiene monomers undergoing free radical polymerization to make a much longer polymer chain molecule.
	en.wikipedia.org /wiki/Polybutadiene (686 words)

	Polybutadiene composition and process for producing same - Patent 5468822
		The yield of the polybutadiene composition was 86.5%.
		The yield of the polybutadiene composition was 90.7%.
		The yield of the polybutadiene composition was 88.5%.
	www.freepatentsonline.com /5468822.html (7233 words)

	United States Patent: 4,590,240
		27.0 grams (0.50 mole) of hydroxyl-terminated polybutadiene and 0.25 grams of benzoyl peroxide were dissolved in 50 milliliters of toluene in a 250 milliliter three-neck flask equipped with a thermometer and a dry ice/acetone condenser.
		121 grams (2.24 moles) of hydroxyl-terminated polybutadiene and 2.5 grams (0.015 moles) of azobisisobutyronitrile were dissolved in 200 milliliters of toluene in a one liter, three-neck flask equipped with a thermometer and an agitator.
		234 grams (4.33 moles) of polybutadiene and 11.0 grams (0.067 moles) of azobisisobutyronitrile were dissolved in 200 milliliters of toluene in a one liter, three neck flask equipped with a thermometer and an agitator.
	pweb.netcom.com /~jhm/4590240.htm (3367 words)

	Polybutadiene composition - Patent 6815481
		The polybutadiene composition according to claim 1 wherein the polymer having a butadiene unit as a polymerization unit is a polymer selected from polybutadiene, styrene-butadiene copolymers, acrylonitrile-butadiene copolymers, acrylonitrile-butadiene-styrene copolymers, styrene-butadiene block copolymers and impact resistant polystyrenes.
		The polybutadiene type polymer comprised in a polybutadiene composition of the present invention is a polymer having a polymerization unit derived from butadiene.
		Polybutadiene may be either a polybutadiene rubber produced by a solution polymerization or a polybutadiene rubber produced by a emulsion polymerization, The impact resistant polystyrene is a polystyrene modified with a polybutadiene rubber, a styrene-butadiene copolymer rubber or the like to suppress occurrence of cracks caused by an impact.
	www.freepatentsonline.com /6815481.html (3007 words)

	Polybutadiene - Properties, Applications, Processing and Types of Polybutadiene (BR)
		The solvents are used to reduce the rate of reaction, control the heat generated by the polymerisation and to lower the viscosity of the polymer solution in the reactor.
		High trans polybutadiene is a crystalline plastic material similar to high trans polyisoprene or balata, which was used in golf ball covers.
		Polybutadiene is and will continue to be a high volume rubber for use in tyres, toughened plastics, and golf balls due to its low cost, availability and unique properties.
	www.azom.com /details.asp?ArticleID=1719 (1206 words)

	U.S. Patent: 5259908 - Heat vulcanizable adhesives and a method for bonding - November 9, 1993
		Heat-vulcanizable adhesives for the bonding of solids, the adhesive contains polybutadiene or a polybutadiene mixture and/or copolymers of butadiene with ethylenically unsaturated monomers and other vulcanizable components, and at least 0.5% by weight (based on the weight of vulcanizable components) of a metal salt as a hardening catalyst.
		The invention is heat-vulcanizable adhesives, for the bonding of solid substrates, which contain polybutadiene or polybutadiene mixtures and/or copolymers of butadiene with olefins and/or diolefins, and optionally other vulcanizable components.
		All of the aforementioned polybutadiene isomers are suitable for use in the adhesive of the present invention.
	www.everypatent.com /comp/pat5259908.html (2943 words)

	Polybutadiene and process for producing the same - Patent 6664347
		Polybutadiene has such a microstructure in which a structural unit produced by polymerization at the 1- and 4-positions (1,4-structure) and a structural unit produced by polymerization at the 1- and 2-positions (1,2-structure) are co-present in the molecular chain.
		The microstructure of polybutadiene was determined by calculation from the intensity ratio of absorptions at 740 cm.sup.-1 for cis-1,4-structure, 967 cm.sup.-1 for trans-1,4-structure and 910 cm.sup.-1 for 1,2-structure (vinyl) in infrared absorption spectroscopy.
		As is apparent from the foregoing Examples, the modified polybutadiene according to the present invention has a reduced linearity and improved cold flow properties as compared with the starting highly linear polybutadiene while retaining the microstructure of the starting polybutadiene having a high cis- 1,4-structure with a moderate proportion of a 1,2-structure.
	www.freepatentsonline.com /6664347.html (5980 words)

	Neutron Scattering from Multicomponent Flory-Huggins Blends (Site not responding. Last check: 2007-10-09)
		The reduced interaction parameter, chi/Delta y(2), was found to be a strong function of the average composition of the blend, in close analogy to an earlier study on ethylene-butene-1 copolymers prepared by saturation of 1,4-polybutadiene-1,2-polybutadiene copolymers.
		However, values for chi/Delta y(2) for the polybutadiene blends were considerably smaller than those present in the ethylene-butene-1 copolymers over comparable ranges of copolymer composition.
		The PVT properties of the polybutadiene copolymers, on the other hand, suggest a much larger interaction as well as adherence to the random copolymer theory.
	www.uh.edu /~ramanan/papers/paper30.html (136 words)

	Toy (Site not responding. Last check: 2007-10-09)
		Polybutadiene is a homopolymer of 1,3 butadiene, which is a monomer containing 4 carbon atoms and 6 hydrogen atoms.
		Most polybutadiene is made in an exothermic reaction using a solution process using either a transition metal complex or an alkyl metal as a catalyst.
		The polymerization of polybutadiene can be either a batch process or a continuous process.
	www.cas.astate.edu /draganjac/yankee.html (148 words)

	Vinyl polybutadiene bisimide copolymers - Patent 4216297
		Although the precise reaction sequence is not known, it is believed that a hydrogen radical is transferred from a second vinyl polybutadiene polymer to the bisimide moiety and a subsequent analogous reaction occurs between the second vinyl polybutadiene and bisimide which results in a cross-link.
		The addition of maleic anhydride to the backbone unsaturation of the 1,4 polybutadiene segments to form a vinyl polybutadiene maleic anhydride adduct was accomplished by refluxing a mixture consisting of a nonterminated vinyl polybutadiene of about 90% 1,2 polybutadiene segments and having a molecular weight of about 3,000 maleic anhydride and xylene.
		The mixture consisted of 100 pbw of the vinyl polybutadiene, 20 pbw of the bisimide, 6 pbw epoxy novalac, 2.5 pbw t-butyl perbenzoate, 6.3 pbw 2,5-dimethyl-2,5-di(t-butylperoxy)-hexane and 0.6 pbw chromium octoate.
	www.freepatentsonline.com /4216297.html (4614 words)

	Polyethylene-polybutadiene blend (Site not responding. Last check: 2007-10-09)
		and fluxed for 2 to 3 minutes, the polybutadiene is added and the mixing continued for about 5 to 7 minutes to produce a uniform mixture, after which the mixture is removed and cooled.
		The process of claim 1 wherein the polybutadiene has a 1,2-content of from about 10 to about 15 percent and a 1,4-content of from about 85 to about 90 percent.
		The process of claim 1 wherein the polybutadiene has a 1,2-content of from about 2 to about 5 percent and a 1,4-content of from about 95 to about 98 percent.
	www.well.com /~youlee/photographic_accessory/polyethylene-polybutadiene_blend.html (237 words)

	Martin Bellander
		This paper is concerned with the microstructural changes during peroxide and high pressure vulcanisation of polybutadiene, unfilled as well as filled with carbon fl.
		The fact that unsaturated rubbers such as polybutadiene and SBR crosslinks to a high level without vulcanisation agents, merely by thermal treatment at elevated pressure has been known for a long time.
		In 1960 Okhrimenko [4] observed that polybutadiene could be crosslinked in that way, and IR (Infrared spectroscopy) studies revealed that the 1,2-vinyl units in the polymer chain were consumed as the degree of crosslinking increased.
	www.nada.kth.se /~henrry/DomainGenerator/WSP/WSP97/martin.html (1973 words)

	Polystyrene
		What would happen if we were to take some styrene monomer, and polymerize it free radically, but let's say we put some polybutadiene rubber in the mix.
		We end up with the polybutadiene copolymerizing with the styrene monomer, to get a type of copolymer called a graft copolymer.
		This is a polymer with polymer chains growing out of it, and which are a different kind of polymer than the backbone chain.
	www.pslc.ws /mactest/styrene.htm (586 words)

	Pierce Law - The IP Mall - Resources Hosted by the IP MALL - BPAI - Board of Patent Appeals and Interferences - ...
		It is uncontroverted that the specific "inherent viscosity" ranges or the single viscosity value recited in the various claims were not literally set forth in any applications filed earlier than the one considered adequate support by the examiner.
		Neither was the recitation "Diene polybutadiene," which is apparently considered to be tantamount to the numerical value limitations both by appellants and the examiner.
		It is through the asserted "finding" by the court that appellants gain entree into an Alliger paper discussed in their final brief, which assertedly proves that Diene inherently possesses the inherent viscosity range of 1 to 3.
	www.ipmall.fplc.edu /hosted_resources/BPAI_Decisions/BPAI_Appeal_91-0909.asp (2171 words)

	Abstract - Comparing the Environmental Degradation of a Synthetic Polybutadiene Copolymer and NR Latex Examination ...
		Glove pieces were treated with acetone to remove the auto-oxidation formulation prior to soil burial and the degradation rates measured as changes in mass loss after 12, 24, 36 and 48 weeks.
		Irrespective of solvent treatments, the polybutadiene copolymer pieces showed insignificant mass loss after 48 weeks, whereas the NR glove pieces retained 6% (treated) and 12% (untreated) of their initial mass.
		treated and untreated polybutadiene copolymer glove pieces, before and after burial, were not different when viewed under conventional scanning and transmission electron microscopy, indicating their unbroken rubber network.
	www.lgm.gov.my /journals/Abstracts/2005/aj105_5.html (221 words)

	e-Polymers (Site not responding. Last check: 2007-10-09)
		Blends of polyamide 12 (PA12) and liquid polybutadiene (HTPB) compatibilized with pyromellitic anhydride (APy) were prepared by melt blending.
		The deformations of the matrix under room temperature impact and the morphology of the blends were investigated with scanning electron microscopy.
		Partial miscibilization of HTPB with PA12 due to the addition of APy was postulated to explain the disappearance of polybutadiene in some cases.
	www.e-polymers.org /abstract_show.cfm/439 (184 words)

	Rubber Chemicals - Polybutadiene rubber in practice
		Polymerized with catalysts, the vulcanizates of polybutadiene rubber have excellent abrasion resistance, elasticity and dimensional stability, low heat build-up, outstanding low-temperature flexibility and good tear resistance.
		With an annual capacity of around 415,000 tons, the Polybutadiene Rubber Business Unit is the world’s largest manufacturer of polybutadiene rubber and also ranks among the leading producers of solution styrene butadiene rubber.
		Polybutadiene rubber (PBR) is used above all for the tread and sidewalls of car tires.
	www.lanxess.com /rubber/en/lanxess/PBR (230 words)

	Bibliography generated from nseref.bib
		Using neutron spin echo and dielectric spectroscopy we have studied the molecular motions of 1-4 polybutadiene in the alpha-beta relaxation regime.
		Merging of the alpha and beta relaxations in polybutadiene: a neutron spin echo and dielectric study.
		It is shown that the results obtained in the incommensurate phase are consistent with a model featuring two slow relaxation mechanisms corresponding to fluctuations in the amplitude and phase of the modulation and characterized by relaxation times tau-A (q) and tau-phi (q), respectively, compatible with the relaxation time tau(q) determined in the paraelectric phase.
	www.ncnr.nist.gov /instruments/nse/nseref_all.html (15551 words)

	Resin composition patent invention
		Resin compositions containing (A) a resin having a polybutadiene structure in a molecule, (B) a thermosetting resin, and (C) a compound having 2 or more mercapto groups in a molecule and/or a compound having a disulfide bond in a molecule are useful for protecting flexible printed circuit boards.
		[0016] (2) The resin composition of the above-mentioned (1), wherein the component (A) is a resin having a polybutadiene structure and a polyurethane structure in a molecule.
		[0017] (3) The resin composition of the above-mentioned (1), wherein the component (A) is a resin having a polybutadiene structure, a polyurethane structure, and a polyimide structure in a molecule.
	www.freshpatents.com /Resin-composition-dt20060420ptan20060083928.php (710 words)

	What'
		Polybutadiene is a diene polymer, that is a polymer made from a monomer containing two carbon-carbon double bonds, specifically butadiene.
		Polybutadiene was one of the first types of synthetic elastomer, or rubber, to be invented.
		A hard rubber called poly(styrene-butadiene-styrene), or SBS rubber is a copolymer containing polybutadiene.
	www.angelfire.com /extreme/whamo/madeof.htm (105 words)

	Citebase - Catalytic degradation of polybutadiene
		The effect of Cobalt Fischere-Tropsch catalyst on the thermal degradation of cis-1,4 polybutadiene, polystyrene, chloride) and poly(vinyl acetate) in solution was investigated at various temperatures.
		The catalyst enhanced the thermal degradation rate of polybutadiene in solution and had no e.ect on the thermal degradation of other polymers.
		The Friedman plot was used to determine the activation energy for the degradation of polybutadiene in pyrolysis.
	citebase.eprints.org /cgi-bin/citations?id=oai:iiscePrints.OAI2:6172 (198 words)

	ISP: Press Releases
		Emulsion polybutadiene is polymerized in an emulsion system similar to that employed in making cold styrene/butadiene rubber.
		Since emulsion polybutadiene exhibits greater resistance to breakdown during mixing operations, it is normally produced to a lower raw viscosity than SBR, for optimum processing characteristics.
		Permeability: The air permeability of emulsion polybutadiene in the green state is more than twice that for its counterpart, SBR.
	www.ispcorp.com /news/news99.html (365 words)

	19 DC - posters
		Scope of this study was to characterize Krasol polybutadienes from the rheological point of view and examine their rheological behavior relevant for their applications in polyurethane preparations.
		The former is used as a polyurethane crosslinker and is unmiscible with polybutadiene.
		Both polybutadienes demonstrated to be effective in the improvement of the toughness and in the impact resistance.
	www.imc.cas.cz /sympo/19discon/posters.htm (2899 words)

	CCCC 2002, Volume 67, Issue 12, Abstracts pp. 1899-1910
		A method for functionalization of hydroxy-terminated polybutadiene with 2-sulfanylethan-1-ol (2-mercaptoethanol) leading to a controlled increase in the OH functionality of the polymer was developed.
		A series of functionalized polybutadienes were synthesized and characterized by their physical and chemical properties.
		The effect of the increased functionality of the polybutadiene on mechanical properties, thermal behavior and hydrolytic resistance of the elastomers was assessed.
	cccc.uochb.cas.cz /Vol/67/No12/20021899.html (176 words)

	Butadiene Polymerization Catalyzed by Lanthanide Metallocene-Alkylaluminum Complexes with Cocatalysts: Metal-Dependent ...
		Both catalytic activity and microstructure of polybutadiene depended strongly on the kind of lanthanide metal and the trialkylaluminum.
		of the resulting polybutadiene increased in proportion to monomer consumption, while the molecular weight distribution stayed narrow throughout the reactions.
		In the presence of a large amount of monomer, molecular weight of polybutadiene was conveniently controlled by additional excess alkylaluminum, which functioned as a chain transfer agent.
	pubs.acs.org /cgi-bin/abstract.cgi/mamobx/2006/39/i04/abs/ma051867q.html (286 words)

	Cohengroup: Publications Archive (Site not responding. Last check: 2007-10-09)
		Nealey, P. F., Cohen, R. and Argon, A. Effect of Gas-Pressure On the Solubility and Diffusion of Polybutadiene in Polystyrene.
		Csernica, J., Baddour, R. and Cohen, R. Gas-Permeability of a Polystyrene Polybutadiene Block Copolymer Possessing a Misoriented Lamellar Morphology.
		Cohen, R. and Ramos, A. Homogeneous and Heterogeneous Blends of Polybutadiene, Polyisoprene, and Corresponding Diblock Copolymers.
	web.mit.edu /cohengroup/pub2.html (2567 words)

	Polybutadiene (Site not responding. Last check: 2007-10-09)
		It didn't take a great a degree of imagination to come up with, as its very similar to natural rubber, polyisoprene.
		Belts, hoses, gaskets and other automobile parts are made from polybutadiene, because it stands up to cold temperatures better than other elastomers.
		Polybutadiene is a diene polymer, that is, it's a polymer made from a monomer that contains two carbon-carbon double bonds, specifically butadiene.
	www.pslc.ws /macrog/pb.htm (162 words)

	polybutadiene - The Wordbook Encyclopedia (Site not responding. Last check: 2007-10-09)
		Thewordbook is a comprehensive encyclopedia and a reference search engine, in which you have found this entry about polybutadiene.
		TheWordbook.com is your reference book and invites you to quarry.
		Translation - whether it means now or is called meant.
	www.thewordbook.com /polybutadiene (731 words)

	Cis polybutadiene tennis shoes (Site not responding. Last check: 2007-10-09)
		In the coming months, we'll be revamping our search performance and introducing new mechanisms for end user to seek advice on tennis tents manufacturer.
		The website is constructed with the specific aim of supplying readers the ability to easily find accurate report about cis polybutadiene tennis shoes on the net.
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	www.pro-tennis.info /cis-polybutadiene-tennis-shoes.html (658 words)

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