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Topic: Polymethyl methacrylate

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	Advice And Tips About RGP Contact Lenses
		The beauty behind these contact lenses is that is that people suffering from moderately impaired vision or a severe astigmatism now have the opportunity to improve their vision through the use of contacts for the very first time.
		As a result of this unhealthy condition research was conducted in order to produce a soft contact lens and shortly thereafter the RGP contact lenses, which became available for mass purchase during the 1980s.
		Rigid gas permeable lenses are constructed from a silicone base allowing them to be slightly more flexible and able to easily pass oxygen to the eyes unlike their forefathers, the polymethyl methacrylate hard contact lenses.
	www.vision-doctor.com /article-102-About-RGP-Contact-Lenses.html (386 words)

	Process for producing a casting plate of polymethyl methacrylate - Patent 4214064
		In 100 parts of the methyl methacrylate syrup as used in Example 1 were dissolved azobisisobutyronitrile as an initiator, dilauryl thiodipropionate as a stabilizer and sodium dioctylsulfosuccinate as a surfactant in amounts as indicated in Table 2, and the resulting mixture was deaerated.
		A continuous casting plate of polymethyl methacrylate was obtained in the same manner as in Example 1 except using 0.1 part of distearyl thiodipripionate as the stabilizer and 0.01 part of polyethyleneglycol dodecylphenyl ether as the surfactant.
		A continuous casting plate of polymethyl methacrylate was obtained by using the resulting syrup as in Example 1, except that 0.05 part of phosphoric acid ester of laurylpolyethyleneglycol was used as the surfactant.
	www.freepatentsonline.com /4214064.html (2172 words)

	Methyl Methacrylate and Polymethyl Methacrylate (IARC Summary & Evaluation, Volume 19, 1979)
		Methyl methacrylate was tested by oral administration and by skin application in rats.
		Polymethyl methacrylate, when implanted intramuscularly, subcutaneously or intraperitoneally as discs, produced local sarcomas in rats.
		No case reports or epidemiological studies relating to the carcinogenicity of methyl methacrylate or polymethyl methacrylate were available to the Working Group.
	www.inchem.org /documents/iarc/vol19/methylmethacrylate.html (230 words)

	Polymethyl methacrylate 1
		Its high light transmission and ability to 'pipe' light make it ideal for illuminated signs for advertising and display.
		A full colour range is possible.The ability to polymerise methyl methacrylate in simple moulds using a polymer/monomer slurry made it ideal for producing dentures and for embedding objects for display.
		Polymethyl methacrylate moulding materials were introduced later, an important early use was in the two-tone coloured GPO telephone which replaced the fl bakelite version in the early 1960s.
	www.plastiquarian.com /acrylics1.htm (168 words)

	Nationwide Evaluation of X-ray Trends (NEXT) - Phantoms
		The phantoms, in essence artificial models, have been designed to invoke a response by the AEC system that is similar to that for average-sized patients subjected to a wide range of practical x-ray conditions.
		The Luc-Al phantoms are primarily composed of clear acrylic, polymethyl methacrylate (PMMA), and aluminum.
		This two-component object is designed to match accurately the narrow-beam attenuation of the tissue thickness being simulated with good accuracy for all energies in the diagnostic range.
	www.fda.gov /cdrh/radhlth/next-phantoms.html (683 words)

	Process for producing polymethyl methacrylate (Site not responding. Last check: )
		This invention is concerned with a process for producing polymethyl methacrylate.
		Polymethyl methacrylate (hereinafter called "PMMA"), a resin with the best transparency among plastics, has long been used as windshields and in other similar applications.
		Since it is a material of a long history, various production methods depending on polymerization have been proposed.
	www.stickebana.com /scitech/heat_pad/process_producing_polymethyl_methacrylate.html (3489 words)

	Method of forming a layer of polymethyl methacrylate on a surface of silicon dioxide (US4352839)
		A method of enhancing the adhesion of polymethyl methacrylate to a surface of silicon dioxide utilizing a solution of carboxylic acid is described.
		spinning said substrate with said solution of polymethyl methacrylate on said surface of silicon dioxide at a speed and for a time to spread said solution over said surface and to remove the solvent of said solution of polymethyl methacrylate thereby forming said layer of polymethyl methacrylate on said surface of silicon dioxide,
		heating said layer of polymethyl methyacrylate on said surface of silicon dioxide at a temperature and for a time to remove residue of the solvent of said solution of polymethyl methacrylate in said layer of polymethyl methacrylate.
	www.delphion.com /details?pn10=US04352839 (306 words)

	PMMA
		Poly(methyl methacrylate), which lazy scientists call PMMA, is a clear plastic, used as a shatterproof replacement for glass.
		The clear barrier at the ice rink which keeps hockey pucks from flying in the faces of hockey fans is made of PMMA.
		PMMA is a member of a family of polymers which chemists call acrylates, but the rest of the world calls acrylics.
	www.pslc.ws /macrog/kidsmac/pmma.htm (380 words)

	Polymethyl Methacrylate (PMMA) Price Report - Chemical pricing information - ICIS Pricing
		ICIS pricing's polymethyl methacrylate price report is an unbeatable source of market intelligence for buyers, sellers, traders and market participants involved in this dynamic industry.
		The European polymethyl methacrylate report references business concluded on a contractual basis.
		The polymethyl methacrylate price report is issued at the close of business on Friday.
	www.icispricing.com /il_shared/Chemicals/SubPage523.asp (121 words)

	Polymethyl methacrylate PMMA polymer monofilaments and fibers
		Polymethyl methacrylate, which is abbreviated as PMMA, is a clear plastic, used as a shatterproof replacement for glass.
		PMMA is a vinyl polymer, made by free radical vinyl polymerization from the monomer methyl methacrylate.
		If the light can be kept at an angle where it is entirely reflected, it will become trapped inside and transmitted along the fiber.
	www.swicofil.com /products/278polymethylmethacrylate.html (880 words)

	Classaction.ca - Settled Actions
		This class action alleges that the Defendants unlawfully conspired to fix, increase, and/or maintain prices in the market for Polymethyl Methacrylate ("PMMA"), also known as acrylic glass and sold under the following trade names: Lucite, Perspex, Plexiglass, Acrylite and Acrylplast.
		The Plaintiff alleges that from at least January 1, 1995 to December 31, 2003, the Defendants and senior executive of the corporate defendants participated in illegal and secretive meetings and made arrangements relating to price targets, specific price increases, and market share divisions for PMMA.
		For further information concerning this action, please contact Andrea DeKay at 1-800-461-6166 ext.
	www.classaction.ca /content/actions/pmma.asp (132 words)

	Biocompatibility of Polymethyl Methacrylate With and Without Barium Sulfate in the Rat Subcutaneous Air Pouch Model
		Repeated injection of air into the subcutaneous tissue of a rat results in the formation of a cavity with a lining that shares many histologic and secretory properties with this pseudosynovium.
		The authors used this model to investigate the differences in biological response to polymethyl methacrylate with and without barium sulfate, and found that the presence of barium sulfate led to a markedly increased inflammatory reaction.
		particulates, implants, biocompatibility, polymethyl methacrylate, pseudosynovium, barium sulfate, particulate debris
	www.astm.org /DIGITAL_LIBRARY/STP/PAGES/STP14859S.htm (181 words)

	Gujmer Methyl Methacrylate Monomer, Gujmet Methylacrylic Acid, Gujpol - P Poly Methyl Methacrylate, Gujpol - S Acrylic ...
		Gujmer is widely used to prepare copolymer or terpolymer resins as emulsions or solutions, using Butyl or Ethyl and Vinyl monomers for various applications.
		Gujpol-P is the registered trademark of acrylic moulding and extruding materials manufactured by Gujarat State Fertilizers Co.Ltd., Polymers Unit, in the plant set-up under technical collaboration with the worked renowned company.
		Gujpol-P is Polymethyl methacrylate type thermoplastic material supplied in pallet form in wide range of colours as well as water-clear colourless in 25kg.
	www.polymersenterprises.com /products.htm (341 words)

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