Showing papers on "Ether published in 1985"

Chemical mutagenesis testing in Drosophila. IX. Results of 50 coded compounds tested for the national toxicology program

Abstract: Fifty chemicals were tested for mutagenic activity in post-meiotic and meiotic germ cells of male Drosophila melanogaster using the sex-linked recessive lethal (SLRL) assay. As in the previous studies in this series, feeding was chosen as the first route of administration. If the compound failed to induce mutations by this route, injection exposure was used. One gaseous chemical (1,3-butadiene) was tested only by inhalation. Those chemicals that were mutagenic in the sex-linked recessive lethal assay were further tested for the ability to induce reciprocal translocations. Eleven of the 50 chemicals tested were mutagenic in the SLRL assay. These included bis(2-chloroethyl) ether, 1,4-butanediol diglycidyl ether, 1-chloro-2-propanol, dimethyl methylphosphonate, dimethyl morpholinophosphoramidate, dimethyloldihydroxyethylene urea, 2,2-dimethyl vinyl chloride, hexamethylphosphoramide, isatin-5-sulfonic acid (Na salt), isopropyl glycidyl ether, and urethane. Five of these, including 1,4-butanediol diglycidyl ether, 2,2-dimethyl vinyl chloride, hexamethylphosphoramide, isopropyl glycidyl ether, and urethane, also induced reciprocal translocations.

Solubility and properties of a poly(aryl ether ketone) in strong acids

Abstract: Proprietes des solutions diluees de poly(oxy phenyleneoxy phenylenecarbonyl phenylene-1,4) dans l'acide sulfurique et HSO 3 Cl. Modification chimique du polymere dans ces acides

A sulphonated poly(aryl ether ketone)

Abstract: Sulfonation et neutralisation controlees de PEEK, caracterisation de PEEK sulfone et effet de cette modification sur la cristallinite, les transitions thermiques et la stabilite thermique

Stereoselective glycosylation of Alcohols and Silyl Ethers Using Glycosyl Fluorides and Boron Trifluoride Etherate

Abstract: The stereoselective glycosylation of alcohols and their silyl ethers has been achieved using O-alkyl-, O-acyl-, and acetal-protected glycosyl fluorides of the pyranose and furanose series and boron trifluoride etherate in CH2Cl2.

Polysaccharide derivatives containing aldehyde groups, their preparation from the corresponding acetals and use as paper additives

Abstract: Polysaccharide aldehydes having the general structure ##STR1## such as starch, cellulose and gum aldehydes, are useful for imparting wet, dry, or temporary wet strength to paper. They are prepared by a non-oxidative method which involves reacting the polysaccharide base, in the presence of alkali, with a derivatizing acetal reagent having the general structure ##STR2## and then hydrolyzing the acetal by adjusting the pH to less than 7, preferably 2-4. R is (CH2)n or a divalent aromatic group and n is 0 or greater; R1, R6, and R7 are hydrogen or an organic group; R2, R5, and R8 are (CH2)m with m being 1-6; R3 and R4 are hydrogen or a lower alkyl; Y is an anion; Z is an organic group capable of reacting with the polysaccharide base to form an ether derivative and selected from the group consisting of an epoxide, ethylenically unsaturated group, halohydrin, and halogen; R11, if present, is a divalent organic group containing no reactive substiuents; and A and A' are lower alkyls or together form at least a 5-membered cyclic acetal.

Liquid crystal compound

Abstract: Optically active liquid crystal compounds represented by general formula (I), wherein A and B each represents -O-, II, III or IV, wherein "-" represents a direct bond, one of R1 and R2 represents a straight-chain alkyl group, and the other represents an alkyl group containing an asymmetic carbon atom or an alkoxyalkyl group having an asymmetric carbon atom and an ether bond, with the asymmetric carbon atom having one of -CH3, -CN, and -Cl are disclosed. Many of these liquid crystal compounds are revealed to show a SmC phase in a wide temperature range around room temperature and perform a rapid response.

Photoresist compositions containing t-substituted organomethyl vinylaryl ether materials

Abstract: t-Butylvinylaryl ethers are provided which can be used to make t-butyl substituted polyaryl ethers and photoresist compositions. The photoresist compositions can be made by combining the t-butylpolyaryl ethers with aromatic onium salts.

Modified polyphenylene ether-polyamide compositions and process

Abstract: Novel modified polyphenylene ether-polyamide compositions comprising polyphenylene ether, polyamide and a polycarboxylic acid and the reaction product thereof and an improved process for preparing the same.

Sustained release compositions comprising hydroxypropyl cellulose ethers

Abstract: Solid tablets of a therapeutically active composition exhibit sustained release properties when compressed with a fine particle sized hydroxypropyl cellulose ether composition.

Polyetherimides. I. Preparation of dianhydrides containing aromatic ether groups

Abstract: A general synthetic method and characterization of bis(ether anhydride)s, the ether containing aromatic dianhydrides of the following structure, are presented. The method involves aromatic nitro-displacement of N-substituted 3- or 4-nitrophthalimide with bisphenoxides to form N-substituted arylene-bis(phthalimido)ethers or bis(ether imide)s. Sixteen structurally different bis(ether imide)s have been prepared and subsequently converted to the corresponding bis(ether anhydride)s. Bis(ether anhydride)s are stable crystalline compounds of a moderate reactivity. Unlike highly reactive dianydrides such as pyromellitic and benzophenonetetracarboxylic dianhydrides bis(ether anhydride)s are semipermanently stable against hydrolysis in the presence of atmospheric moisture.

Sustained release compositions

Abstract: Dispersions capable of the sustained release of active organic agents comprising an aqueous dispersion of a water-insoluble cellulose ether which cellulose ether particles have reversibly diffused therein the active agent. The dispersions may be used as dispersions, dewatered to form a powder, or coalesced to form films or other articles all of which are capable of sustained release of the active agent.

Electrolyte for lithium secondary battery

Abstract: PURPOSE: To obtain a stabilized lithium secondary battery having excellent characteristics and a long cycle lifetime by including organic solvent made of specific organic fluorine ether compound in the electrolyte. CONSTITUTION: Low viscosity solvent made of organic fluorine ether compound shown by R 1 -O-R 2 , R 1 -O-R 2 , in which R 1 , R 2 means fluorine alkyl group having the number of carbon atom at 1-10, or R 2 means alkyl group. Even in the interface with the positive electrode active material of a high voltage system having the strong oxidation work, electron is not drawn, oxidation decomposition is restricted, and furthermore, quick rise of the viscosity at a low temperature is not generated to prevent the lowering of the ion conductivity, and the lowering of the battery characteristic can be restricted. Consequently, in the case where this electrolyte is applied to the lithium battery at a voltage more than 4V, the stabilized charging/discharging characteristic with the excellent low temperature characteristic and the long lifetime can be obtained. COPYRIGHT: (C)1995,JPO

Polymer mixture comprising a polyphenylene ether and a polyamide

Abstract: The mechanical properties of polyphenylene ether - polyamide mixtures are improved by the addition of an oxidized polyolefin wax. In addition, a phosphite is preferably added.

Neoalkoxy organo-titanates and organo-zirconates useful as coupling and polymer processing agents

Abstract: A composition of matter comprising neoalkoxy compounds having the following formula: ##STR1## wherein M is titanium or zirconium, R, R 1 and R 2 are each a monovalent alkyl, alkenyl, alkynyl, aralkyl, aryl or alkaryl group having up to twenty carbon atoms or a halogen or ether substituted derivative thereof, and, in addition, R 2 may also be an oxy derivative or an ether substituted oxy derivative of said groups; A, B, and C are each a monovalent aroxy, thioaroxy, diester phosphate, diester pyrophosphate, oxyalkylamino, sulfonyl or carboxyl containing up to 30 carbon atoms; and a+b+c=3.

Epoxy resin composition

Abstract: PURPOSE:The titled low-viscosity, polyfunctional composition containing no halogen group and prevented from deteriorating semiconductor elements, comprising a specified epoxy resin, a crosslinking agent, a cure accelerator, and a filler. CONSTITUTION:A mononuclear polyhydric (at least dihydric) phenol is reacted with an allyl halide in the presence of caustic alkali to introduce thereinto an allyl ether group and a nucleus-substituted allyl group to obtain a polyallylated polyphenol having at most 0.2, per molecule, phenolic OH group and 2.5, per colecule, allyl groups (total of ether types and nucleus-substituted types). The obtained polyallylated polyphenol is epoxidized with an organic peracid to obtain an epoxy resin of a type of a polyglycidyl ether of a mononuclear polyphenol. This resin is mixed with a crosslinking agent (e.g., dicyandiamide), a cure accelerator [e.g., resorcinol salt of 1,8-diazabicyclo(5,4,0)-undecene-7], a filler (e.g., silver powder), and additives (e.g., glycidyl ester of a 14C long-chain fatty acid).

Photochemistry of the o-nitrobenzyl system in solution: evidence for singlet-state intramolecular hydrogen abstraction

Abstract: Several oxygen-substituted o-nitrobenzylic compounds in THF solution were studied by picosecond transient spectroscopy. The o-quinonoid intermediate resulting from intramolecular H abstraction was observed in those compounds which undergo efficient reaction. In the case of phenyl o-nitrobenzyl ether and p-cyanophenyl o-nitrobenzyl ether, both the triplet excited state and the o-quinonoid were observed at early times. For these two compounds, the o-quinonoid intermediate is formed from the singlet excited state at a rate much faster than triplet decay. 18 references, 4 figures.

VUV‐optical oscillator strength distributions of C3H6 and C4H8 isomers

Abstract: The photoabsorption cross sections of C2H6O isomers (ethyl alcohol and dimethyl ether) and C3H8O isomers (n‐propyl alcohol, isopropyl alcohol, and ethyl methyl ether) have been measured in the wavelength region from 30 nm to the ionization potential of each molecule (about 120–130 nm) using an ionization chamber. The obtained photoabsorption cross sections show a maximum value at about 70–80 nm for each molecule. In the wavelength region shorter than about 50 nm, the cross sections are almost the same among isomers and equal to the sum of the cross sections for the constituent atoms. In the longer wavelength region, however, the cross sections show different peaks and shoulders depending on its molecular structure. Especially in the cases of dimethyl ether and ethyl methyl ether vibrational structures of the cross section are observed in the wavelength region from 70 to 100 nm.