摘要:
This invention pertains to novel copolyesters consisting essentially of units (I), (II), (III), and (IV). ##STR1## and blends of these polymers and articles made from both. Units (I), (II), (III), and (IV) are present in specified proportions as defined in the "Description of the Invention".The instant copolyesters display orientation in the molten state, good fiber ratings and high strength. Advantageously, the polymers of the present invention display a significant improvement in viscosity and moldability of the neat polymer. The polymers have excellent mechanical and surface properties including blister resistance, strength, toughness, and ability to vapor phase solder, and form strong fibers while still maintaining a high heat distortion temperature. They have melting points in the range of from about 250.degree. to about 360.degree. C. and are melt-processible. Advantageously, these compositions filled with about 30 weight percent of glass fibers display heat distortion temperatures of up to 240.degree. C., when measured under a load of 264 psi. The polymers may be blended to tailor properties. These polymers and blends may be used advantageously in producing fibers and in electrical equipment, electronic components and other end uses requiring moderately high temperatures.
摘要:
Arylene sulfide polymers such as polyphenylene sulfide containing ash-forming impurities or materials verified by contacting an aqueous mixture of such polymer with molecular oxygen and a finite, but small, effective amount of a mineral acid under conditions sufficient to reduce the ash-forming impurities and concurrently at least partially cure the polymer.
摘要:
Polycarbonamide compositions having improved acid dye-resistance and basic dyeability properties wherein said polycarbonamides contain, as an integral part of the polymer chain, recurring amide linkages and terminal sulfonate groups resulting from alkali metal salts of aminobenzenesulfonic acids, as well as the process for producing the modified polyamide compositions. From 50 to 300 mol percent of an alkaline metal hydroxide per mol of aminobenzenesulfonic acid salt dyeability modifier is utilized to enhance the color and washability of the resulting compositions.
摘要:
This invention pertains to novel copolyesters consisting essentially of units (I), (II), (III), and (V). ##STR1## and blends of these polymers and articles made from both. Units (I), (II), (III), and (IV) are present in specified proportions as defined in the "Description of the Invention". The instant copolyesters display orientation in the molten state, good fiber ratings and high strength; they have melting points in the range of from about 340.degree. to about 400.degree. C. and are melt-processible. Advantageously, these compositions filled with about 30 weight percent of glass fibers display heat distortion temperatures of over 240.degree. C. up to about 280.degree. C. and higher, when measured under a load of 264 psi. When blended, certain properties are improved, particularly they are easier to melt fabricate, have a decreased tendency to blister and increased strength. These polymers and blends may be used advantageously in ovenware, electronic components, electrical equipment, and other end uses requiring high temperatures.
摘要:
This invention relates to the preparation of wholly aromatic polyesters from monomers having a total ash content of no more than 50 ppm and a total potassium content of no more than 20 ppm. These polyesters have good color and good thermal stability and are essentially free of char material which can lead to unacceptable molded and extruded articles.
摘要:
Phenol is extracted with a chlorinated aromatic extractant, such as p-dichlorobenzene, from an aqueous mixture containing phenol and N-methylpyrrolidone. In an embodiment of this invention the purified N-methylpyrrolidone is recycled for use in a poly(phenylene sulfide) polymerization process.
摘要:
A process for removing compounds from aprotic solvents in which aprotic solvent containing at least one acidic compound is contacted with a solid inorganic compound chosen from alkaline earth carbonates, alkaline earth hydroxides, alkaline earth oxides, and alumina in which the contact of the solvent with a solid inorganic compound is by the process of fluidized bed contact, stirred slurry contact or trickle bed contact. Contaminated NMP from poly(phenylene sulfide) production is substantially freed of acidic contaminants by a series of fractionations with a treatment of the kettle liquid of at least one fractionation by the method described above and/or a treatment of the overhead of the last fractionation in series by the method described above.
摘要:
A copolyester having good impact strength is prepared utilizing terephthalic acid or the lower alkyl esters thereof and a mixture of 1,4-butanediol and 1,4-cyclohexanedimethanol as the sole monomers.
摘要:
An information handling network includes a plurality of information processing systems having a pretermit system configuration operating under the control of a corresponding number of operating systems where during a initial microcode load (IML) period prior to loading the operating systems a change in the system configuration is detected based on the predetermined system configuration. Upon detecting the change, a communication adaptor device is activated for communicating certain configuration information over the network before loading the operating system.
摘要:
This invention pertains to novel copolyesters consisting essentially of units (I), (II), (III), and (IV). ##STR1## and blends of these polymers and articles made from both. Units (I), (II), (III), and (IV) are present in specified proportions as defined in the "Description of the Invention."The instant copolyesters display orientation in the molten state, good fiber ratings and high strength; they have melting points in the range of from about 340.degree. to about 400.degree. C. and are melt-processible. Advantageously, these compositions filled with about 30 weight percent of glass fibers display heat distortion temperatures of over 240.degree. C. up to about 280.degree. C. and higher, when measured under a load of 264 psi. When blended, certain properties are improved, particularly they are easier to melt fabricate, have a decreased tendency to blister and increased strength. These polymers and blends may be used advantageously in ovenware, electronic components, electrical equipment, and other end uses requiring high temperatures.