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Topic: Copolymer

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	Acetal resin/block copolymer blend (Site not responding. Last check: 2007-10-08)
		The block copolymer of the instant invention effectively acts as a mechanical or structural stabilizer which interlocks the polymer structure networks and prevents the consequent separation of the polymers during processing and their subsequent use.
		For example, the resin and block copolymer may be dissolved in a solvent common for all and coagulated by admixing in a solvent in which none of the polymers are soluble.
		Optionally, the block copolymer may be mixed with a rubber compounding oil or supplemental resin as described hereinbefore to change the viscosity characteristics of the block copolymer.
	www.sacnewsmonthly.com /invent/polycyclic_macrocyclic_compounds/acetal_resin_block_copolymer_blend.html (4786 words)

	Porous copolymer resins (Site not responding. Last check: 2007-10-08)
		Vinyl halide copolymer resins having relatively high porosity levels are produced by polymerizing a vinyl halide with a comonomer of an acrylated caprolactone.
		Generally, the copolymers are suspension-polymerized in an aqueous medium containing: (1) a suspending agent consisting of one or more water-soluble polymer substances such as polyvinyl alcohol, cellulose ether, partially hydrolyzed polyvinyl acetate, vinyl acetate-maleic anhydride or partially saponified polyalkyl acrylate or gelatine, and (2) a polymerization initiator.
		For example, the desired resin composition containing the copolymer resins of the present invention is homogeneously kneaded by a mill roll, a Banbury mixer, an extruder or the like, and thereafter is fed in the molded step of calendering, extrusion, injection or pressing.
	www.stickebana.com /scitech/copying_machine/porous_copolymer_resins.html (4129 words)

	Tangram Technology Ltd. - Polymer - PP - Random Copolymer
		Polypropylene random copolymers are a type of polypropylene in which the basic structure of the polymer chain has been modified by the incorporation of a different monomer molecule.
		Random copolymers also have higher levels of extractable materials and atactic PP, and polymer chains with much higher levels of ethylene (to 15wt.-%).These higher extractable levels occur to one degree or another with all commercial copolymer materials (depending on the polymerization process), and can cause problems in meeting FDA food contact regulations for some applications.
		Polymerizing high ethylene copolymers in hexane diluent is more difficult because of the solubility in hexane of the secondary by-products of the reaction (atactic PP and copolymer with very high ethylene content).
	www.tangram.co.uk /TI-Polymer-PP_Random-Copolymer.html (1079 words)

	Fluorine-containing elastomeric copolymer (Site not responding. Last check: 2007-10-08)
		An elastomeric copolymer comprising TFE, VdF and HFP is known to be a fluorine-containing elastomer having good heat, oil and chemical resistance and is used in various fields in the form of, for example, a gasket, a packing, a diaphragm and a tube.
		The curing component may be blended in the copolymer of the invention by a suitable method depending on viscoelasticity and form of the materials to be blended.
		To the copolymer prepared in each of Examples and Comparative Examples, the components as shown in Table were added to prepare a curing composition and its curing properties were examined by means of a curastometer (JSR II type).
	www.emergenthomestore.com /techcat/manhole_cover_support_ring/fluorine-containing_elastomeric_copolymer.html (1833 words)

	Copolymer - Patent 6858324
		A copolymer according to claim 1 where T is a meta- or para-trifluoromethyl benzene or a meta, meta-trifluoromethyl benzene.
		The present polymer is a copolymer, therefore, Ar' cannot be the same as the group having formula I. The present polymers are soluble in typical organic solvents such as xylene.
		10 is a cyclic voltamogram for a copolymer comprising alternating units of F8, pTFF and TSB.
	www.freepatentsonline.com /6858324.html (3977 words)

	International Union of Pure and Applied Chemistry
		Copolymers that are obtained by copolymerization (see Definition 3.4) of two monomer species are sometimes termed bipolymers, those obtained from three monomers terpolymers, those obtained from four monomers quaterpolymers, etc..
		A copolymer comprising linear molecules of uniform relative molecular mass and uniform elemental composition but different sequential arrangements of the various types of monomeric units (see Definition 1.8), is not uniform (e.g., a copolymer comprising molecules with a random arrangement as well as a block arrangement of monomeric units).
		In the constituent macromolecules of a block copolymer, adjacent blocks are constitutionally different, i.e., adjacent blocks comprise constitutional units (see Definition 1.14) derived from different species of monomer (see Definition 2.1) or from the same species of monomer but with a different composition or sequence distribution of constitutional units.
	www.iupac.org /reports/1996/6812jenkins/substances.html (1419 words)

	Alcohol compatible copolymer patent invention
		The copolymer includes at least one olefinically unsaturated carboxylic acid monomer, at least one olefinically unsaturated mono- or di-alkyl ester of a di-carboxylic acid monomer, and at least one olefinically unsaturated hydrophilic, non-ionic monomer.
		In another aspect the copolymer is miscible with an alcohol such as methanol, thereby enabling direct injection of the copolymer into mono-ethylene glycol/methanol recycle lines for hydrate-forming gas fields.
		The copolymer is formed from the polymerization of at least one or more olefinically unsaturated carboxylic acid monomers, at least one or more olefinically unsaturated mono- or di-alkyl esters of a di-carboxylic acid monomer and at least one or more olefinically unsaturated hydrophilic, non-ionic monomers.
	www.freshpatents.com /Alcohol-compatible-copolymer-dt20061109ptan20060252653.php (1934 words)

	EPA: Federal Register: Acrylic Acid, Styrene, <greek-a>-Methyl Styrene Copolymer, Ammonium Salt; and Styrene, ...
		Acrylic acid, styrene, -methyl styrene copolymer, ammonium salt; and styrene, 2-ethylhexyl acrylate, butyl acrylate copolymer conform to the definition of polymer given in 40 CFR 723.250(b) and meet the following criteria that are used to identify low-risk polymers: Acrylic acid, styrene, -methyl styrene copolymer, ammonium salt: 1.
		Given the existing widespread and historic use of acrylic acid, styrene, -methyl styrene copolymer, ammonium salt, any additional exposure resulting from the approval of the copolymer as an inert ingredient in pesticide formulations for use on growing crops or to raw agricultural commodities after harvest is not warranted.
		Although exposure to styrene, 2-ethylhexyl acrylate, butyl acrylate copolymer may occur through dietary (e.g., food wrapping containing copolymer) and non-occupational (e.g., printed articles) sources, the chemical characteristics of styrene, 2-ethylhexyl acrylate, butyl acrylate copolymer lead to the conclusion that there is a reasonable certainty of no harm from aggregate exposure to the polymer.
	www.epa.gov /fedrgstr/EPA-PEST/1998/September/Day-29/p26003.htm (3389 words)

	Block Copolymer Micelles (Site not responding. Last check: 2007-10-08)
		They are the consequence of a self-assembling tendency displayed by block copolymers when dissolved in a so-called selective solvent, which is a good solvent for one of the blocks, but a poor one for the other.
		Copolymers emerged as an alternative way of combining properties of different macromolecules by building a macromolecule containing additional monomers.
		For block copolymer solutions, whose aggregation process may be significantly more complex, only a few investigations would be detailed enough as to assess the applicability of the term micelle.
	www.dekker.com /sdek/92581562-48195621/abstract~db=enc~content=a713562404 (825 words)

	Beyond copolymer 1
		Copolymer 1, also called glatiramer acetate, is an unusual therapeutic compound, a heterogeneous mix of polypeptides containing the four amino acids Y, E, A, and K in definite ratios but with no uniform sequence.
		Copolymer 1 is presented on class II MHC molecules, including the HLA-DR2 type that is associated with increased risk of MS.
		Given the precedent of Copolymer 1?s safety and efficacy in people with MS, the use of other copolymers, perhaps optimized to target an individual?s MHC haplotype, seems an attractive scenario for MS and perhaps other autoimmune diseases.
	www.eurekalert.org /pub_releases/2002-06/joci-bc1053102.php (298 words)

	Electrochromic device containing acid copolymer electrolyte - Patent 4361385
		An improved device defined by claim 2 wherein the proportion of copolymerized 2-acrylamido-2-methylpropanesulfonic acid units to vinyl sulfonic acid units in the copolymer is in the range from 3:2 to 2:3.
		An improved device defined by claim 2 wherein the proportion of copolymerized 2-acrylamido-2-methylpropanesulfonic acid units to vinyl sulfonic acid units in the copolymer is in the range from 0.01:1 to 10:1.
		Furthermore, using a film of the AMPS-VSA copolymer instead of the AMPS homopolymer in the device, the device is more tolerant to variations in the moisture content of the polymeric electrolyte layer, and this allows one to manufacture a long-life device using less exacting manufacturing techniques.
	www.freepatentsonline.com /4361385.html (1783 words)

	EPA: Federal Register: Acrylic Graft Copolymer, Polyester Block Copolymer and Polyester Random Copolymer; Tolerance ...
		The polymers, acrylic graft copolymer; polyester block copolymer and polyester random copolymer are not cationic polymers nor are they reasonably anticipated to become cationic polymers in a natural aquatic environment.
		Thus, the polymers acrylic graft copolymer; polyester block copolymer and polyester random copolymer meet all the criteria to be considered low risk polymers under 40 CFR 723.250.
		Since acrylic graft copolymer; polyester block copolymer and polyester random copolymer conform to the criteria that identify a low risk polymer, there are no concerns for risks associated with any potential exposure scenarios that are reasonably foreseeable.
	www.epa.gov /fedrgstr/EPA-PEST/2000/February/Day-23/p4238.htm (3037 words)

	Proliferous copolymer of vinyl pyrrolidone and vinyl acetate - Patent 6620900
		Accordingly, it is an object of the present invention to provide a proliferous copolymer of vinyl pyrrolidone and vinyl acetate for use as efficient excipient for drugs, and which has advantageous dissolution and disintegration properties at predetermined pH levels.
		In particular, the proliferous copolymers of vinyl pyrrolidone and vinyl acetate of the invention exhibit slower dissolution and disintegration properties under aqueous acidic conditions (which is attributed to their increased hydrophobicity) as compared to polyvinylpyrrolidone homopolymer.
		In accordance with the invention, there is provided herein a proliferous copolymer of vinyl pyrrolidone and vinyl acetate which is an effective and advantageous excipient for drugs, and which is capable of effecting a predetermined dissolution and disintegration of drug tablets at various pH levels.
	www.freepatentsonline.com /6620900.html (1314 words)

	Block Copolymer Interface Morphologies
		Block copolymers phase separate into domains which are quite regular, and are hence often referred to as 'self-organizing systems'.
		TEMsim is a tool designed to infer the three-dimensional structure of morphologies observed in block copolymers in TEM images, by matching those images to simulated projections of of volumes separated by mathematically modelled surfaces.
		Copolymer films: Watching molecules organize themselves gives a primarily two-dimensional view of phase separation in block copolymers.
	www.msri.org /about/sgp/jim/models/copolymers/main.html (349 words)

	Copolymer Equation Applet
		This JAVA applet plots the copolymer equation and lets you explore the effect of varying the parameters.
		The copolymer equation lets you predict the composition of the polymer as a function of the current ratio of monomers and the relative reactivities for monomers reacting with themselves or with the comonomer.
		Copolymer theory can be found in various tests such as Paul J. Flory, "Principles of Polymer Chemistry." pages 178-203 (Cornell University Press, Ithaca and London, 1953).
	www.eng.utah.edu /~nairn/applets/Copoly.html (479 words)

	Extruded vinylidene chloride copolymer flexible packaging film - Patent 5030511
		More particularly, vinylidene chloride copolymers of low molecular weight, with a processing aid preferably also of low molecular weight, have been surprisingly found to be of enhanced thermal stability.
		An object of the present invention is to improve the thermal stability of vinylidene chloride copolymers and to lessen their tendency to degrade while being extruded, and hence provide improved melt shear stability.
		The invention also provides that in a flexible polymeric film of vinylidene chloride copolymer wherein the major portion of the copolymer is vinylidene chloride, said vinylidene chloride copolymer containing a processing aid, the improvement comprising the vinylidene chloride copolymer is of a weight-average molecular weight of about 100,000 or less.
	www.freepatentsonline.com /5030511.html (5561 words)

	Copolymer Equation Applet
		This JAVA applet plots the copolymer equation and lets you explore the effect of varying the parameters.
		The copolymer equation lets you predict the composition of the polymer as a function of the current ratio of monomers and the relative reactivities for monomers reacting with themselves or with the comonomer.
		Copolymer theory can be found in various tests such as Paul J. Flory, "Principles of Polymer Chemistry." pages 178-203 (Cornell University Press, Ithaca and London, 1953).
	www.mse.utah.edu /~nairn/applets/Copoly.html (479 words)

	Chemie.DE News-Center: GE Silicones Introduces Velvesil 125 Copolymer Network
		Velvesil copolymer is designed for use by formulation chemists creating new products for skin care and antiperspirants, and for hair care and color cosmetics.
		In skin care products, Velvesil 125 copolymer is a sensory modifier and bodying ingredient providing a soft, velvety feel to the skin in face and body creams and lotions.
		Velvesil(TM) 125 silicone copolymer network is a translucent gel in appearance, with percent solids of 12-13% and viscosity @ 25C of 200,000 - 350,000 cP.
	www.chemie.de /news/e/12762/?ps=&pw=a&t=&defop=and&wild=yes&sdate=01.01.1995&edate=15.02.2006&sort=1 (429 words)

	Acetal Copolymer — Compression vs. Extruded: Plastic Distributor & Fabricator
		With the decision made to use acetal copolymer, the question becomes whether to choose extruded or compression molded sheet.
		Acetal copolymer plates with thickness of 1.5” were also analyzed in a similar fashion.
		The extruded acetal copolymers that were tested meet or exceed the requirements of ASTM D 6100 S-POM 0211LP and they comply with the appropriate FDA regulations for direct food.
	www.plasticsmag.com /features.asp?fIssue=May/Jun-05 (796 words)

	Dan's Research
		In application, block copolymers are often used as a component in a mixture of solvent or pure homopolymer.
		In this study, the attachment approach is to append the block copolymers using a well-defined nano-structured chemical to a given segment of the copolymer.
		If these nano-sized objects are on a similar length scale to the periodicity of the block copolymer, one expects the surface chemistry of the nano-structures to play a significant role in altering the thermodynamics and morphology of the copolymer matrix.
	www.egr.msu.edu /~drazkows/research.htm (1576 words)

	Graft copolymer compositions (US4990558)
		These graft copolymer compositions are well-balanced with respect to impact strength and stiffness at high ductility levels.
		The compositions, which may be admixed with one or more additives such as inorganic fillers in an amount, for example, of up to about 80 parts additive per 100 parts of the graft copolymer and rubber component, are rigid thermoplastics useful as stand-alone structural materials.
		Graft polymers of polymerizable monomers and olefin polymers
	www.delphion.com /details?pn=US04990558__ (176 words)

	Nanopatterning with Block Copolymer Templates
		We have exploited the highly-regular microdomain structures formed by block copolymers in the creation of templates for nanoscale lithography--a two-dimensional templating procedure, in contrast to the three-dimensional approach used in restricting crystallization.
		We have termed this patented process “block copolymer nanolithography”; it is applicable to a broad range of substrates, and moreover, the mask or patterned substrate can act as a template for the growth of regular arrays of nanodispersed materials.
		For such cases, shear-aligned block copolymer thin films are the templates of choice.
	www.princeton.edu /~polymer/nano.html (785 words)

	Mauritz - Block Copolymer Research
		This polymer was coined as ‘gel core multi-arm star block copolymer.’ Termination of polymerization is typically induced by the addition of methanol to the living system.
		Block copolymers of PS and polydienes (PD) were converted into BCPIs (See Figure 2).
		Similarly, Hasegawa and coworkers have observed the inverse of OBDD in the linear block copolymers with PS as the major component.
	www.psrc.usm.edu /mauritz/block.html (898 words)

	Styrene Butadiene Styrene Data S
		VECTOR 4113A is a blend of a linear triblock copolymer (SIS) and a diblock (SI) copolymer.
		VECTOR 4215A is a blend of SIS triblock and SI diblock copolymer with higher styrene (30%) and slightly lower diblock content versus VECTOR 4213A.
		VECTOR 4230 is a styrene-isoprene radial copolymer with a styrene content centered at 20.5%.
	www.dexcopolymers.com /msds_sis_frame.htm (526 words)

	Try-lock Roofing Company - Copolymer Rubber Roof Coating
		Roofs that are coated with this copolymer rubber roof coating are cooler during peak summer conditions than roofs with traditional dark materials.
		Copolymer Rubber Roof Coating is a synthetic rubber coating that transforms most existing membranes into AN ATTRACTIVE, HIGHLY REFLECTIVE SURFACE WITH ENHANCED WEATHERING CHARACTERISTICS.
		Copolymer Rubber Roof Coating creates a monolithic membrane that has excellent elongation, tensile strength, UV resistance, low temperature flexibility and superior adhesion properties.
	www.trylock.com /roofcoatings.html (241 words)

	Glatiramer Acetate (Copolymer-1, Copaxone) Promotes Th2 Cell Development and Increased IL-10 Production Through ...
		A synthetic random basic copolymer with promiscuous binding to class II major histocompatibility complex molecules inhibits T-cell proliferative responses to major and minor histocompatibility antigens in vitro and confers the capacity to prevent murine graft-versus-host disease in vivo.
		Copolymer 1 acts against the immunodominant epitope 82–100 of myelin basic protein by T cell receptor antagonism in addition to major histocompatibility complex blocking.
		Copolymer 1 induces T cells of the T helper type 2 that cross-react with myelin basic protein and suppress experimental autoimmune encephalomyelitis.
	www.jimmunol.org /cgi/content/full/170/9/4483 (5278 words)

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