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Topic: Homopolymer

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	Basics of Design Engineering - Engineering Materials - Plastics and properties - ACETAL
		Melting points of the homopolymers are higher, and they are harder, have higher resistance to fatigue, are more rigid, and have higher tensile and flexural strength with generally lower elongation.
		Homopolymer grades are available that are modified for improved hydrolysis resistance to 180 °F, similar to copolymer materials.
		Homopolymer acetals have high resistance to organic solvents, excellent dimensional stability, a low coefficient of friction, and outstanding abrasion resistance among thermoplastics.
	www.machinedesign.com /BDE/materials/bdemat2/bdemat2_3.html (1338 words)

	United States Patent Application: 0040122196
		The polypropylene resin composition of claim 6, wherein the polypropylene comprises a homopolymer polypropylene and the composition further comprises less than 40% by weight of the total composition of an ethylene/1-octene copolymer having a density of from 0.865 to 0.91 g/ml.
		The MFR and other properties of this intermediate homopolymer were not measured, but the properties of the homopolymer are expected to be similar to the properties of the homopolymer of Example 1.
		The crystallinity of the intermediate homopolymer was not measured, but the value of crystallinity is expected to be similar to the values for the homopolymer of Example 1, possibly lower by about 1%.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20040122196".PGNR.&OS=DN/20040122196&RS=DN/20040122196 (6623 words)

	MARCUS Oil & Chemical: Products: Product Information: Product Properties: Micronized Polyethylenes
		The homopolymers (including the micronized types) and the oxidized polyethylene M 3400 are permitted in an amount not to exceed that required to produce the intended technical effect and this is a maximum of not more than 2% upon the weight of the rubber product.
		The homopolymer grades (including the micronized types) and the oxidized polyethylene M 3400 are permitted providing that the amount does not exceed that required to achieve the intended effect and, that the amount which may be incorporated into the food does not exceed 10 parts per million.
		The homopolymer grades (including the micronized types) and the oxidized polyethylene M 3400 are permitted for use provided the amount used is no more than necessary to achieve the intended effect and, that the extraction limitations for the packaging of cheese and cheese products are observed.
	www.marcusoil.com /product_regulatory.html (1585 words)

	Sheeting made from polymers of ethylene and propylene, and its use - US Patent 5622760 (Site not responding. Last check: 2007-10-12)
		such that 5 to 20 parts by weight of the homopolymer of ethylene and 5 to 40 parts by weight of the ethylene-propylene copolymer are added to 100 parts by weight of the homopolymer of propylene.
		The term "homopolymer", in the sense of the invention, is intended to mean that this polymer consists essentially of ethylene or of propylene.
		In general, a "homopolymer" in the sense of this invention includes a polymer containing, along with ethylene or propylene, up to about 10 mole-percent of one or several comonomers, particularly isoprene, 1,3-butadiene, ethylene (in the case of a propylene homopolymer), propylene (in the case of an ethylene homopolymer), butene, hexene, and octene or their isomers.
	www.patentstorm.us /patents/5622760.html (2539 words)

	Polyacetal (01/02S12) (Site not responding. Last check: 2007-10-12)
		The improved thermal and chemical stability of the copolymer versus the homopolymer is a result of randomly distributed oxyethylene groups.
		Once the chain of the homopolymer is ruptured by such an attack, the exposed polyformaldehyde ends decompose to formaldehyde and acetic acid.
		The acetate end cap of the homopolymer, however, is readily hydrolyzed in the presence of alkalis, causing significant polymer degradation.
	www.chemsystems.com /newsletters/perp/Oct02_N01S12.cfm (641 words)

	Oriented polypropylene film substrate and method of manufacture - Patent 4345005
		The homopolymer polypropylene core layer is 80% to 100% isotactic, and preferably 95% to 96% isotactic, that is they have a type of polymeric molecular structure containing a sequence of regularly spaced asymmetric atoms arranged in like configuration in the polymer chain.
		Further, the homopolymer polypropylene core layer has a melt index of from about 2 to about 10 grams/10 minutes, and preferably a melt index of about 3.5-6 grams/10 minutes.
		Tests (2) and (3) were on a coextruded homopolymer polypropylene core having ethylene propylene copolymer 3% ethylene outer layers, and a homopolymer polypropylene core having medium density polyethylene outer layers, respectively.
	www.freepatentsonline.com /4345005.html (1366 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		The nucleoside of the second homopolymer region is complementary to the nucleoside of the first homopolymer region.
		The splint oligonucleotide is phosphorylated at the 5'end.
		The homopolymer region of the splint oligonucleotide is 3'to the variable region.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=05/10159.050203&ELEMENT_SET=DECL (8300 words)

	OhioLINK ETD: Adedeji, Adeyinka
		It is well-established that block copolymers A-b-B, whose segments are incompatible, can function as emulsifiers in blends of homopolymers of A and B. In such blends, the volume fractions of the blend constituents determine the morphology; and the emulsifying power is primarily dictated by the molecular weight ratio of homopolymer to block copolymer.
		However, when there is exothermic mixing between one of the block copolymer segments and one homopolymer, the role of the molecular weight ratios becomes less significant, since the competition between exothermic and endothermic interactions can strongly influence the morphology.
		In ternary A/A-b-B/B or A/X-b-B/B blends, the tendency of the block copolymer to migrate to the interface (interfacial activity) depends on incompatibility of homopolymer A with block B and between homopolymer B and block A or X (Nχ scAB and Nχ scBA or Nχ scBX, respectively).
	www.ohiolink.edu /etd/view.cgi?case1058451685 (305 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		The article is characterized in that said adhesive comprises said adhesive comprises a polyolefinic homopolymer having an isotacticity of less than 60% of [mmmm] pentad concentration.
		The isotacticity of the homopolymers may be reduced compared to the isotactic polypropylenes of the prior art due to a statistic distribution of stereoscopic errors in the polymer chain.
		Alternatively, the homopolymer of the present invention may include sequences of atactic and isotactic blocks of polymer.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/27213.010419&ELEMENT_SET=DECL (2670 words)

	Capron® Nylon Resins - BASF Corporation Plastics Portal (Site not responding. Last check: 2007-10-12)
		Capron 8202 NL is an unfilled, low viscosity, non-lubricated nylon 6 injection molding homopolymer exhibiting excellent melt fluidity for filling thin sections.
		Capron B100MP is a lubricated and nucleated, medium vicosity, nylon 6 extrusion grade homopolymer for cast or blown film.
		Capron B135MP is a lubricated and nucleated, high viscosity, nylon 6 extrusion grade homopolymer for cast or blown film.
	www.asresin.com /products/capron.html (886 words)

	Asymmetric Miscibility in Random Copolymer/Homopolymer Blends: Monomeric Size and Polarity
		This asymmetric miscibility of a random copolymer with its related homopolymers is not predicted by the Copolymer Effect theory, and its underlying causes are unclear in the absence of strong intermolecular interactions.
		The preferential miscibility of a copolymer with one of its related homopolymers is of interest as current theoretical models of polymer miscibility do not predict this behavior.
		Thickness fluctuations were particularly problematic for system IV due to the extremely low molecular weights of the homopolymer used and the high solution concentrations required to produce films of an appropriate thickness.
	pubs.acs.org /cgi-bin/jtextd?mamobx/33/i01/html/ma991151t (4523 words)

	Optical recording element having a polymerized crosslinked homopolymer smoothing layer - Patent 4619890
		The optical recording element of claim 1 or 2 wherein n is 2 to 6 and m is 3.
		The element of claim 1 or 2 wherein the heat-deformable optical recording layer comprises an amorphous composition having an absorption factor of at least 20 and comprises a binder and a dye.
		The invention has been described in detail with particular reference to preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.
	www.freepatentsonline.com /4619890.html (2123 words)

	Celanese - News Releases
		This PBT was chosen because it forms a strong bond with the two-part epoxy that glues the cap insert to the pen’s outer shell.
		Celanex PBT replaced an acetal homopolymer that tended not to glue well to the outer shell.
		Compared to acetal homopolymer, Celcon acetal allowed A.T. Cross to significantly reduce cycle times in their multicavity molds.
	www.celanesechemicals.us /mr_news_business-fullpage?id=16848 (648 words)

	Journal of Materials Research 19(11) November 2004
		Transport kinetics of methanol in hydroxyethyl methacrylate homopolymer and its copolymers
		A combined case I and case II diffusion model was used to describe the transport processes.
		On the other hand, the activation energies of case I transport of the copolymers are substantially higher than those of the HEMA homopolymer; however, the level of DHPMA loading in the copolymer does not seem to affect the activation energy.
	lucy.mrs.org /publications/jmr/jmra/2004/nov/0443.html (282 words)

	Oxirane, (chloromethyl)-, homopolymer, mono((Z)-9-octadecenyl) ether, compd. with N,N-dimethylmethanamine - toxicity, ...
		Chemical Identification and Use for Oxirane, (chloromethyl)-, homopolymer, mono((Z)-9-octadecenyl) ether, compd.
		Sorry, no water quality standards or criteria have been established for this chemical by the U.S. or Canadian governments; however, there may be criteria established for related chemicals.
		Ecotoxicity for Oxirane, (chloromethyl)-, homopolymer, mono((Z)-9-octadecenyl) ether, compd.
	www.pesticideinfo.org /Detail_Chemical.jsp?Rec_Id=PC39868 (709 words)

	[No title]
		acetal homopolymer offers slightly higher mechanical properties than acetal copolymer, but may contain a low density center (also known as "center line porosity") especially in large cross-sections.
		is ideal for small diameter, thin-walled bushings that benefit from the additional strength and rigidity of homopolymer acetal.
		AF is a unique thermoplastic material for use in moving parts in which low friction and long wear life are important.
	pages.sbcglobal.net /ic_spearguns/delrin.html (360 words)

	Quadrant Engineering Plastic Products : Source EPP : Products : Acetals (Site not responding. Last check: 2007-10-12)
		Delrin, a homopolymer acetal, is also manufactured and stocked in rod and plate.
		Delrin is ideal for small diameter, thin-walled bushings that benefit from the additional strength and rigidity of homopolymer acetal.
		Delrin AF Blend is a unique thermoplastic material for use in moving parts in which low friction and long wear life are important.
	www.quadrantepp.com /source/acetals.html (694 words)

	Polyvinyl Acetate (PVAc)(Vinyl Acetate Homopolymer) Market Study Report - European Adhesives Industry
		These homopolymers are sold as latex, emulsion or spray dried solids.
		The spray dried polyvinyl acetate emulsions can be reconstituted in water, mixed with other adhesive emulsions or mixed with other dry ingredients where they have the ability to be used as a binder in dry mix formulations.
		PVAc homopolymers are the lowest cost emulsions while possessing good adhesion to many porous surfaces such as wood and paper.
	www.chemquest.com /store/polyvinyl-acetate-european-adhesives.html (528 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		Improved dimensional stability over comparable homopolymer formulations due to its lower level of crystallinity.
		Lower centerline porosity than homopolymer in extruded shapes.
		In most cases, acetal homopolymer and copolymer can be interchanged because many material properties are approximately 10% of each other.
	www.alhyde.com /Acetaldifferences.htm (499 words)

	1,6-HEXAMETHYLENE DIISOCYANATE HOMOPOLYMER (Partially Validated #PV2125) (Site not responding. Last check: 2007-10-12)
		This is the amount spiked on a sampler that would produce a peak approximately 10 times the response for a sample blank.
		The extraction efficiency of 1,6-hexamethylene diisocyanate homopolymer was determined by liquid-spiking glass fiber filter coated with 1.0 mg of 1-2PP with the analyte over the range of 0.5 to 2 times the target concentration.
		Five glass fiber filter coated with 1.0 mg of 1-2PP were spiked with 15 µg 1,6-hexamethylene diisocyanate homopolymer, allowed to equilibrate for 6 h, and then had 15 L humid air (absolute humidity of 15.9 mg/L of water, about 80% relative humidity at 22.2°C) pulled through them.
	www.osha.gov /dts/sltc/methods/partial/pv2125/pv2125.html (1639 words)

	Expression of Heteropolymeric Ferritin Improves Iron Storage in Saccharomyces cerevisiae -- Kim et al. 69 (4): 1999 -- ...
		Lanes: 1, H homopolymer; 2, heteropolymer; 3, L homopolymer; SM, size marker.
		The heteropolymer and H homopolymer are indicated by circles and triangles, respectively.
		The data for the L homopolymer are described in the text because the L homopolymer required prolonged incubation (>4 h) before a significant increase in iron uptake was observed.
	aem.asm.org /cgi/content/full/69/4/1999 (3846 words)

	yet2.com - TechPak - Process of polymerizing chloroetrifluoroethylene with alkyl hydroperoxide and metal metabisulfite
		Process for the production of PCTFE homopolymer and/or copolymer resins by the use of an aqueous suspension system incorporating a redox initiator system which comprises t-butyl hydroperoxide and sodium metabisulfite to initiate the polymerization or copolymerization process.
		The process parameters may be controlled to provide a PCTFE homopolymer or copolymer resin having a desired target range of molecular weights.
		The process provides stable PCTFE polymer suspensions which exhibit a low tendency to coagulate and further exhibit good wettability of the homopolymer and copolymer particles, notably in the absence of soaps.
	www.yet2.com /app/utility/external/indexpatent/19189 (241 words)

	Products - Honeywell Aclon Resin
		Honeywell offers two main grades of Aclon™ PCTFE resin, Homopolymer and Copolymer resin.
		Aclon™ homopolymer resin is recommended for Multilayer container application and Aclon™ copolymer resin is recommended for Tubing applications.
		Aclon™ resin homopolymer and copolymer grades provide a range of qualities, enabling users to achieve optimal processing and finished part characteristics
	www.honeywell.com /sites/portal?smap=aclon&page=products&theme=P1 (117 words)

	[No title]
		This approach is based on the "coloring" in two "colors" monomeric units of a homopolymer taken in some well-defined conformation (globular conformation1,2,4), conformation of adsorbed chain2,3), etc.4)), depending on the spatial position of the unit in this "parent" conformation.
		To prepare the primary sequences we have taken some particular conformation of a usual homopolymer globule and assigned two different types A and B to monomeric units which differ by their spatial positions inside that globule due to some of criteria.
		Main steps of the sequence design scheme for protein-like copolymers: (a) homopolymer globule; (b) the same globule after "coloring" procedure; (c) protein-like copolymer in the coil state.
	polly.phys.msu.ru /~chertov/dounload/papmacs5.doc (2862 words)

	Plasdone S-630 Copovidone
		Addition of vinyl acetate groups to the vinylpyrrolidone polymer chain reduces its hydrophilicity relative to PVP homopolymer.
		The lower hydrophilicity of Plasdone S-630 copolymer, compared to the homopolymer, is demonstrated by its moisture adsorption profile relative to that of Plasdone K-29/32 PVP homopolymer (Figure 4).
		The Tg of Plasdone S-630 copolymer is 106°C compared to 165°C for PVP homopolymer of similar K-value.
	www.ispcorp.com /products/pharma/content/brochure/plasdone630/hydro.html (458 words)

	Dow H703-22 Polypropylene Homopolymer
		Dow Polypropylene Homopolymer Resins are semi-crystalline thermoplastic materials that can provide a combination of desirable properties and affordability: low density; excellent chemical resistance and ESCR; excellent moisture barrier; high heat resistance, good gloss; high stiffness and hardness, and low water absorption.
		Dow Polypropylene Homopolymer resins are suitable for a wide range of applications and may be fabricated by injection molding, blow molding and extrusion.
		H703-22 Polypropylene Homopolymer resin is suitable for injection molding.
	www.matweb.com /search/SpecificMaterialText.asp?bassnum=PDW052 (224 words)

	SPI: About the Industry: Definitions of Resins
		Stated very simply, the large chainlike molecules are formed by hooking together short-chain molecules of chemicals (monomers: mono = one, mer = unit) in a reaction known as polymerization (poly = many).
		When units of a single monomer are hooked together, the resulting plastic is a homopolymer, such as polyethylene, which is made from the ethylene monomer.
		Industrial end-users are very familiar with the acetals in the form of gears, bearings, bushings, cams, housings, conveyors and any number of moving parts in appliances, business machines, etc., Consumers may be more familiar with applications such as automotive door handles, seat belt components, plumbing fixtures, shaver cartridges, zippers and gas tank caps.
	www.plasticsindustry.org /industry/defs.htm (4802 words)

	Acetal Polyoxymethylene Homopolymer — POM UV Stabilised
		The excellent mechanical properties of a homopolymer with improved weather ability and longer lifetime for external components.
		However the finer the particle, the poorer the heat stability.
		Also prone to high mould shrinkage and attack by acids and bases, as with unmodified homopolymer.
	www.azom.com /details.asp?ArticleID=382 (116 words)

	Oxirane, (chloromethyl)-, homopolymer, mono((Z)-9-octadecenyl) ether, compd. with N,N-dimethylmethanamine Registration
		Information on the status of this pesticide as legally registered for use, banned, cancelled or severely restricted for countries for which PAN has data.
		Summary Toxicity Information for Oxirane, (chloromethyl)-, homopolymer, mono((Z)-9-octadecenyl) ether, compd.
		International Registration Information for Oxirane, (chloromethyl)-, homopolymer, mono((Z)-9-octadecenyl) ether, compd.
	www.pesticideinfo.org /Detail_ChemReg.jsp?Rec_Id=PC39868 (374 words)

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