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Topic: Chloroprene

In the News (Thu 26 Nov 09)

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	Chloroprene (2-Chloro-1,3-Butadiene) \| Technology Transfer Network Air Toxics Web site \| US EPA
		Chloroprene is polymerized to form polychloroprene (neoprene), a synthetic rubber used for wire and cable covers, gaskets, automotive parts, adhesives, caulks, flame-resistant cushioning and other applications requiring chemical, oil and weather resistance or high gum strength.
		Acute oral exposure of rats caused inflammation of the mucous membranes; damage to the lungs, liver, spleen, and kidneys; and irritation of the gastrointestinal tract.
		Chloroprene occurs as a colorless, mobile, flammable, and volatile liquid that is slightly soluble in water.
	www.epa.gov /ttnatw01/hlthef/chloropr.html (1497 words)

	Chloroprene (IARC Summary & Evaluation, Volume 71, 1999)
		Chloroprene was tested for carcinogenicity in two studies in mice, in two studies in rats and in one study in hamsters, all by inhalation with samples of purity > 99%.
		In one study in rats, chloroprene caused increased incidences of tumours of the oral cavity, thyroid gland, lung, mammary gland and kidney.
		The observation of excretion of mercapturates of chloroprene indicates that glutathione conjugation occurs in rats.
	www.inchem.org /documents/iarc/vol71/003-chloroprene.html (359 words)

	NTP: Abstract for TR-467 - Chloroprene
		There was clear evidence of carcinogenic activity of chloroprene in female F344/N rats based on increased incidences of neoplasms of the oral cavity; increased incidences of neoplasms of the thyroid gland, mammary gland, and kidney were also attributed to exposure to chloroprene.
		Exposure of male and female rats to chloroprene was associated with increased incidences of alveolar epithelial hyperplasia in the lung; nephropathy; and several nonneoplastic effects in the nose including olfactory epithelial atrophy, fibrosis, adenomatous hyperplasia, basal cell hyperplasia, chronic inflammation, respiratory metaplasia, and necrosis.
		Exposure of male and female mice to chloroprene was associated with increased incidences of bronchiolar hyperplasia and histiocytic cell infiltration in the lung; epithelial hyperplasia in the forestomach; renal tubule hyperplasia (males only); several effects in the nose including olfactory epithelial atrophy, respiratory metaplasia, and adenomatous hyperplasia; and hematopoietic cell proliferation in the spleen.
	ntp-server.niehs.nih.gov /index.cfm?objectid=070A80D0-96F2-115A-6354967089C17F9B (3909 words)

	Chloroprene polymer - Patent 5089601
		Ionic polymerization of chloroprene has been studied, but the interaction between the chlorine atoms contained in the chloroprene monomer and the metal catalyst, is extremely strong, and there has been a problem such as deactivation of the catalyst due to withdrawal of the chlorine atoms (e.g.
		Firstly, chloroprene is subjected to photopolymerization by means of the initiator of the formula (IX) to obtain a both-terminal dithiocarbamate-modified polychloroprene represented by the formula (X): ##STR15## wherein R.sub.3 and R.sub.4 are as defined above, M.sub.1 represents a chloroprene monomer residue, and n is a natural number of from 20 to 5,000.
		For the photopolymerization reaction of chloroprene, it is preferred to employ ultraviolet rays having a wavelength necessary for the decomposition of the dithiocarbamate and the generation of radicals, for example, a wavelength of from 300 to 500 nm.
	www.freepatentsonline.com /5089601.html (3861 words)

	chloroprene - Encyclopedia.com
		chloroprene or 2-chloro-1,3-butadiene, colorless liquid organic compound used in the synthesis of neoprene and certain other rubbers.
		The structure of the chloroprene molecule is very similar to that of isoprene; the molecule contains two double bonds and is readily polymerized.
		Biggest Chloroprene Rubber Project to Be Established In Shanxi.(joint venture announced between Shanxi Synthetic Rubeer Group Co. Ltd.
	www.encyclopedia.com /doc/1E1-chloropr.html (298 words)

	b-Chloroprene - (Organic Method #112)
		Chloroprene auto-oxidizes easily, polymerizes spontaneously at room temperature, and forms cyclic dimers on prolonged standing even in the presence of polymerization inhibitors (Ref.
		Determine the concentration (w/w) of the 50% chloroprene in xylene using the freshly distilled chloroprene as reference.
		Chloroprene may be confirmed by GC/MS using GC conditions similar to those in Section 3.5.1.
	www.osha.gov /dts/sltc/methods/organic/org112/org112.html (3143 words)

	Process for the preparation of chloroprene polymer solutions suitable for contact adhesives - Patent 4156671
		Production of a solution of a chloroprene polymer, suitable for use as a component for an adhesive, by dissolving the polymer in a solvent, and heating the solution, adding a free-radical catalyst and contacting the solution with a molecular oxygen containing gas, until the viscosity of the solution is lowered by at least about 10%.
		A process for the production of a solution of a chloroprene polymer suitable for use as the major constituent in an adhesive which comprises preparing a solution of about 10 to 30 weight percent of a chloroprene polymer in a compatible organic solvent, heating the solution to a temperature in the range of about 40.degree.
		The process of claim 1 in which the chloroprene polymer is selected from the class consisting of homopolymers of chloroprene and copolymers of chloroprene in which chloroprene is at least 80 weight percent of the total weight of the polymer.
	www.freepatentsonline.com /4156671.html (1596 words)

	Reference.com/Encyclopedia/Chloroprene
		Chloroprene is the common name for the organic compound 2-chloro-1,3-butadiene, which has the chemical formula C
		The modern chloroprene process which is currently used by nearly all makers uses butadiene differently.
		Then this compound undergoes an elimination of a hydrogen atom in the #3 position and the chlorine atom in the #4 position as HCl forming a double bond between the #3 and #4 carbon atoms in the molecule, yielding chloroprene.
	www.reference.com /browse/wiki/Chloroprene (242 words)

	Xanthogen disulphides with functional groups (Site not responding. Last check: 2007-10-26)
		Suitable benzene insoluble cross-linked chloroprene polymers can be prepared by various methods which yield cross-linked polymer in the latex form, for example the chloroprene may be polymerised to a high degree of conversion in the absence of a chain transfer agent or with only small quantities of such agent, e.g.
		Cross-linked chloroprene polymers are obtained by the same methods as knwon for making benzene soluble chloroprene polymers but monomer conversion is raised to, e.g.
		The benzene insoluble chlorprene polymer is preferably a copolymer of chloroprene and 2 to 20% by weight (based on chloroprene) of a diester of a dihydric aliphatic alcohol and an acrylic acid.
	www.sacnewsmonthly.com /invent/disc_brake_railway_vehicles/xanthogen_disulphides_with_functional_groups.html (4558 words)

	RT/Dygert International :: Compounds
		Chloroprene (commonly known as "neoprene") is one of the oldest synthetic elastomers.
		Chloroprene has good resistance to napthenic and paffaffinc oils of high molecular weight, but swell excessively in aromatic oils of low molecular weight.
		Some chloroprene vulcanizates, especially O-Rings, sometimes exhibit distortion due to crystallization of the rubber at room temperature, which can be completely reversed by warming the parts in low heat.
	www.rtenterprises.com /products/compounds/chloroprene.cfm (194 words)

	Chemipat Chloroprene (Neoprene) Rubber Coatings
		Chloroprene, of which the best known is Neoprene manufactured by Dupont, is a chlorinated synthetic rubber used for its resistance to weathering and for a certain degree of chemical resistance.
		Chloroprene rubber coatings can be compounded to give a variety of physical characteristics when coated onto fabric.
		Other uses for Chloroprene coated fabrics include tarpaulins, car covers, protective workwear, etc. Chloroprene solution can be provided in a variety of colours, filled with additives to impart different physical characteristics, such as handle and abrasion resistance, at many different viscosities and solids levels.
	www.chemipat.co.uk /synthrub_coat_sol_chlorop.htm (91 words)

	Research Highlights - Natural Sciences - University of Newcastle
		Chloroprene (2-chlorobuta-1,3-diene)) is a large-scale petrochemical used to make polychloroprene, a solvent resistant polymer employed in the manufacture of automotive rubber goods and personal protection.
		There is concern that workers exposed to chloroprene in its manufacture and subsequent use are at risk from cancers.
		At Newcastle, we have studied the metabolism of chloroprene and have found that there is indeed cause for concern.
	www.ncl.ac.uk /nsci/research/chemistry/highlights/btg.htm (224 words)

	Chloroprene [factsheet]
		The National Toxicology Program (NTP) is testing chloroprene with inhalation bioassays in both rats and mice.
		* Chloroprene occurs as a colorless, mobile, flammable, and volatile liquid that is slightly soluble in water.
		* Chloroprene is polymerized to form polychloroprene, a synthetic rubber used for wire and cable covers, gaskets, automotive parts, adhesives, caulks, flame-resistant cushioning and other applications requiring chemical, oil and weather resistance or high gum strength.
	www.weblakes.com /toxic/CHLOROPRENE.HTML (1062 words)

	Phenolic
		Chloroprene rubber has an excellent weathering, oil and chemical resistance.
		However, it is necessary to use a modifying agent to improve the properties of chloroprene rubber adhesives such as tackiness retention time, phasing stability, heat resistance and adhesion strength.
		TAMANOL 500 series resins have excellent compatibility with chloroprene rubber and, therefore, it is an indispensable modifying agent for chloroprene rubber for manufacturing adhesives to meet specific purposes.
	www.arakawa-usa.com /tech_Phenolic.htm (183 words)

	NIOSH CURRENT INTELLIGENCE BULLETIN 1 CHLOROPRENE DHHS (NIOSH) Publication No. 78-127
		Chloroprene is a colorless liquid that is slightly soluble in water.
		Of the 34 cases of lung cancer in workers exposed to chloroprene or its derivatives, 18 were among persons having direct and prolonged exposure to the chloroprene monomer.
		If this breakdown is applied to the two chloroprene subgroups shown in the skin cancer table (Groups III and IV), the lung cancer rates would be 2.6 (18 ÷ 684) for the group with exposure to chloroprene monomer and 0.7 (16 ÷ 2,250) for the group exposed to chloroprene latexes.
	www.cdc.gov /niosh/78127_1.html (1553 words)

	The World Market for Chloroprene Rubber (CR): A 2007 Global Trade Perspective:
		I have developed a methodology, based on macroeconomic and trade models, to estimate the market for chloroprene rubber (cr) for those countries serving the world market via exports or supplying from various countries via imports.
		The total level of imports and exports on a worldwide basis, and those for each region, is based on a model which aggregates across over 150 key country markets and projects these to the current year.
		Chloroprene Rubber (CR) as a category is defined in this report following the definition given by the United Nations Statistics Division Classification Registry using the Standard International Trade Classification, Revision 3 (SITC, Rev. 3).
	www.mindbranch.com /Chloroprene-Rubber-CR-R307-23013 (812 words)

	Water-based neoprene contact cement comprising ionizable resin mixture in a copolymer of chloroprene and methacrylic ...
		The aqueous contact cement according to claim 1, wherein the amount of said chloroprene copolymer is from about 15 to about 65% by weight and the amount of said resinous polyelectrolyte is from about 5 to about 15% by weight, based on the total weight of said dispersion.
		The present invention is based upon the use, in combination, of a chloroprene copolymer having carboxylic functionality and a resinous polyelectrolyte as defined above, dispersed in water.
		The average particle size of typical latexes of chloroprene copolymers having carboxyl functionality that are useful in the present invention is about 0.3 microns.
	freepatentsonline.com /4788239.html (1686 words)

	Survey of Chemical Substances in Consumer Products, No. 63 2005 – Mapping and release of chemical substances from ...
		To andre produkter, nemlig waders og dykkersokker, indeholdt i underkanten af 2 % chlor på vægtbasis hvilket indikerer at indholdet af chloropren i disse to produktet er ganske lavt.
		Chloroprene gloves are recommended for use only in the winter season because it is difficult to hold on to things properly when sailing.
		For a chloroprene type as the one used as reference (the sample from the rubber factory), this corresponded to a chlorine content in a dive suit of approx.
	www.mst.dk /udgiv/Publications/2004/87-7614-767-3/html/helepubl_eng.htm (11148 words)

	Chloroprene [factsheet]
		Acute oral exposure of rats caused inflammation of the mucous membranes; damage to the lungs, liver, spleen, and kidneys; and irritation of the gastrointestinal tract.
		An increased incidence of lung cancer was not reported in another study of American workers occupationally exposed to chloroprene during the manufacture of neoprene.
		* Chloroprene is polymerized to form polychloroprene, a synthetic rubber used for wire and cable covers, gaskets, automotive parts, adhesives, caulks, flame-resistant cushioning and other applications requiring chemical, oil and weather resistance or high gum strength.
	www.lakes-environmental.com /toxic/CHLOROPRENE.HTML (1062 words)

	DENKA : Product Information : Synthetic rubber:DENKA CHLOROPRENE
		Chloroprene rubber has many superior characteristics compared to natural and even other synthetic rubber types, so it has numerous applications.
		In particular, its possible uses have been expanded to civil engineering/construction and precision components as well.
		Chloroprene rubber demonstrates a good balance of features, including such as resistance to ozone, oil and heat; flame retardancy, weatherability, special cohesiveness, etc., and is very easy to process.
	www.denka.co.jp /cgi-bin/product_en/showproduct.cgi?id=401 (307 words)

	LANXESS - Chloroprene rubber
		This natural rubber, previously obtained from the rain forests of Brazil and today mainly from large plantations in South Asia, is then shipped in large bales to rubber factories in industrial countries.
		Chloroprene is the primary product for the production of synthetic rubber.
		Vulcanization is a chemical process that causes the long molecule chains to become bound together, but only at some points so that a wide-meshed, well-spaced network is formed.
	www.lanxess.de /microsites/en/Chloropren/Chloroprene-rubber (224 words)

	Toxicologic Review of Selected Chemicals - 214
		Reinhardt concluded that there was no evidence indicating that the former 25-ppm PEL was not protective, but OSHA believes the systemic effects (i.e., growth retardation) seen in rats and hamsters exposed to 39 ppm chloroprene for four weeks or to 50 ppm for a lifetime suggest that the 25-ppm PEL is not sufficiently protective.
		1-1032) that reported a significant excess of embryonic mortality in female rats that were mated to male rats exposed to 1 ppm chloroprene.
		NIOSH concluded that it was prudent to reduce exposure to 1 ppm over a 15-minute period, to reduce the risk of genetic abnormalities being transmitted to subsequent generations.
	www.cdc.gov /niosh/pel88/126-99.html (870 words)

	American Chemical Society: Chemical & Engineering Safety Letters (Site not responding. Last check: 2007-10-26)
		It was determined that this compound, of limited solubility in chloroprene, had formed by the reaction of nitrogen oxides (NOx) with chloroprene.
		NOx had formed in the chloroprene refining column by thermal decomposition of inhibitors used to stabilize the monomer and prevent "popcorn" polymer in vapor spaces.
		The inhibitor is a complex mixture of thermally and hydrolytically unstable compounds containing nitro, nitrito, nitroso, and nitrato functional groups, formed by bubbling nitrogen tetroxide (N2O4) gas through a mixture of two low molecular weight olefins.
	pubs.acs.org /cen/safety/19950807.html (442 words)

	Lanxess Chemicals Group Opens Chloroprene Rubber Center
		In the production of chloroprene rubber (CR) LANXESS is continuing to focus on quality, modernization and capacity expansion.
		The chemicals group opened a new central control building for CR in Dormagen on December 13, 2005.
		Dormagen houses the world’s largest CR unit with a direct link between chloroprene monomer and polychloroprene.
	www.jobwerx.com /news/lanxess_biz-id=947752_142.html (366 words)

	ChinaBlueStar
		The fulfilling of the project marked that the technology of latex of chloroprene degasification process in Shangxiang has won the international level.
		Nowadays, the company has made great achievement in developing latex of chloroprene secondary pipe degasification technology, which laid a very strong foundation for developing chloroprene rubber in China.
		Meanwhile, the application of this project can also raise degasification rate of latex of chloroprene, reduce organic content in waster water, and play an important role in ease environmental protection pressure for manufacturers of chloroprene rubber.
	www.china-bluestar.com /en/pop/pop.asp?infoid=726 (239 words)

	LANXESS invests in chloroprene rubber
		The project is aimed at optimizing processes and safety and expanding capacity, and is due for completion by the end of the year.
		If the project runs smoothly, the chances of obtaining a permit from the authorities quickly are rated high.
		Chloroprene is used in a large number of applications in the field of technical rubber goods, e.g.
	mediarelations.lanxess.de /lanxess/lnxnews.nsf/ID/2329084AF420359BC12571EF003E993A?OpenDocument (302 words)

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