Abstract: A thermoplastic molding preform is made of a carbon fiber, which is coated with a sizing at an amount X between 0.05 and 0.30 weight %. The sizing is formed of a heat resistant polymer or a precursor of the heat resistant polymer. The amount X of the sizing is expressed with a following formula: X = W 0 - W 1 W 0 × 100 where W0 is the weight of the carbon fiber with the sizing, and W1 is the weight of the carbon fiber without the sizing.

Abstract: A flock material exhibiting an increased degree of filament separation prepared by cutting a fluoropolymer or carbon fiber yarn into lengths, introducing mechanical energy into the lengths in order to cause the lengths to separate into single-filaments fibers and removing or classifying at least a portion of the single-filament fibers from the lengths in order to obtain a flock having a particular fraction of single-filament, fluoropolymer or carbon fibers.

Abstract: A flock material exhibiting an increased degree of filament separation prepared by cutting a fluoropolymer or carbon fiber yarn into lengths, introducing mechanical energy into the lengths in order to cause the lengths to separate into single-filaments fibers and removing or classifying at least a portion of the single-filament fibers from the lengths in order to obtain a flock having a particular fraction of single-filament, fluoropolymer or carbon fibers.

Abstract: An improved intimate cardable fiber blend containing polytetrafluoroethylene fibers, dual glass fibers and polyphenylene sulfide fibers and a filtration felt including a needled batt of the intimate cardable fiber blend made by mechanically blending the polyphenylene sulfide fibers and glass fibers with polytetrafluoroethylene fibers, carding the blend to form a nonwoven batt and needling the batt to provide a felt.

Abstract: A flock material exhibiting an increased degree of filament separation prepared by cutting a fluoropolymer or carbon fiber yarn into lengths, introducing mechanical energy into the lengths in order to cause the lengths to separate into single-filaments fibers and removing or classifying at least a portion of the single-filament fibers from the lengths in order to obtain a flock having a particular fraction of single-filament, fluoropolymer or carbon fibers.

Abstract: An epoxy composition includes an epoxy resin, a latent curing agent, and a catalyst. The composition includes two epoxide groups per molecule, and the latent curing agent is preferably a dicyanopolyamide, and most preferably dicyandiamide. The catalyst includes 2,4-toluene bis dimethyl urea, preferably in a concentration exceeding 70% by weight. The composition can be used in prepregs. The relative concentrations of the epoxy resin, curing agent, and catalyst are selected to achieve desired properties, including specific curing times and temperatures, and glass transition temperatures that enable a cured resin composition to be removed from a mold after being heated to its curing temperature, without being cooled. Exemplary formulations have reduced cure times, at both high and low curing temperatures, as compared to prior art formulations.

Abstract: An epoxy composition includes an epoxy resin, a latent curing agent, and a catalyst. The composition includes two epoxide groups per molecule, and the latent curing agent is preferably a dicyanopolyamide, and most preferably dicyandiamide. The catalyst includes 2,4-toluene bis dimethyl urea, preferably in a concentration exceeding 70% by weight. The composition can be used in prepregs. The relative concentrations of the epoxy resin, curing agent, and catalyst are selected to achieve desired properties, including specific curing times and temperatures, and glass transition temperatures that enable a cured resin composition to be removed from a mold after being heated to its curing temperature, without being cooled. Exemplary formulations have reduced cure times, at both high and low curing temperatures, as compared to prior art formulations.

Abstract: An epoxy composition including an epoxy resin, a latent amine curing agent, and a specific catalyst. Preferably, the epoxy resin includes two epoxide groups per molecule, and the latent amine curing agent is a dicyanopolyamide, most preferably, dicyandiamide. The specific catalyst is preferably 2,4-toluene bis dimethyl urea. A prepreg employing the epoxy composition of the present invention can achieve a 95% cure in about one half of the time required by a prepreg that differs only in the catalyst employed. Furthermore, prepregs employing the epoxy composition of the present invention have glass transition temperatures higher than the curing temperatures when cured at a temperature range from about 80° C. to about 150° C., enabling cured prepregs to be removed from molds without being cooled. Use of the prepregs of the present invention thus enables composite component manufacturers to substantially increase production rates without requiring the use of additional molds.

Abstract: An electrode comprising a carbonaceous material including carbon fibers, which are bound together by means of carbon atoms. It is preferable that 10-50 w/w % of the carbonaceous material are short carbon fibers 2-20 mm long, which are dispersed and stacked in random directions substantially in a two-dimensional plane and shaped into a plate or sheet, in which the fibers bind to each other by means of carbon atoms to form a carbonaceous electrode. The invention further comprises the method of compressive and electro-osmotic dehydration, wherein direct current is flowed between the electrode, and the polarity is reversed after each predetermined amount of current flow.

Abstract: An electroconductive integrated substrate and a process for producing the same, which comprises a porous carbonaceous plate having a large number of pores and gas permeability, and a gas unpermeable electroconductive plate laminated on the porous carbonaceous plate and integrally bonded thereto by thermoplastic resin which is present substantially only in the pores of the porous carbonaceous plate. It is preferred to use thermoplastic resin having a melting viscosity of from 10.sup.2 to 10.sup.6 poises, and a gas permeable porous carbonaceous plate having a mean pore diameter of from 20 to 150 .mu.m and a porosity of from 40 to 85%. The porous carbonaceous plate and the gas impermeable electroconductive plate are laminated one upon the other with a thermoplastic resin film interposed therebetween, and the film is melted to bond the plates together. The integrated substrate obtained has an electrical resistance of not greater than 7 m.OMEGA., preferably not greater than 1.5 m.OMEGA.

Abstract: A porous electrode substrate for fuel cell and a process for producing the same, which contains 35 to 60% carbonized resin by weight, and has pores with a mean pore size of 20 to 60 .mu.m and a porosity of 60 to 80%, and a compression ratio of 20% or less. Chopped carbon fibers with fiber lengths of 3 to 20 mm and fiber diameters of 4 to 9 .mu.m are dispersed in random directions within substantially 2-dimensional plane, and bound with an organic binder to make an carbon fiber mat. The carbon fiber mat is impregnated with a resin to make prepreg and hot pressing the prepreg under a temperature of 120.degree. to 200.degree. C. and a pressure of 2 to 10 kg/cm.sup.2. Then, the press molded product is carbonized by heat treatment under a temperature of 1300.degree. to 3000.degree. C. in an inert atmosphere or in vacuum to obtain an electrode substrate excellent in various characteristics such as gas permeability, flexural strength, compression strength, etc.

Abstract: A specific isomer of a trisubstituted benzene is continuously separated from a mixture containing at least two isomers of the trisubstituted benzene by adsorptive separation using a simulated moving bed, wherein a faujasite type zeolite adsorbent is used as the adsorpent and the specific isomer is separated as the extract component in the presence of a substituted benzene compound. The specific isomer to be separated is, for example, 2,6-dichlorotoluene, 3,5-dichlorotoluene and 2-chloro-m-xylene. The substituted benzene compound is preferably a compound represented by the formula: ##STR1## wherein R.sup.1 is H or CH.sub.3, R.sup.2 is H, CH.sub.3 or Cl and R.sup.3 is CH.sub.3 or Cl, with the proviso that the case where R.sup.1 is CH.sub.3, R.sup.2 is Cl and R.sup.3 is Cl is excluded.

Abstract: A substituted benzene isomer mixture containing a meta-substituted benzene or 1,3,5-substituted benzene is contacted with an adsorbent of a faujasite type zeolite containing a Ag cation and/or a Cu cation, whereby the meta-substituted benzene or 1,3,5-substituted benzene is separated and recovered as a raffinate component.

Abstract: The present invention relates to a rotary valve for distributing a fluid in various directions and collecting fluids from various directions. The rotary valve consists of two stator disks having passages that constitute a part of complete passages through which the fluid runs, and a rotor disposed between the two stator disks and having passages which communicate with selected at least two of the passages in the stator disks to form complete passages through which the fluid runs. Each time the rotor is turned intermittently, different passages are formed through which the fluid runs.

Abstract: A substituted benzene isomer mixture containing a meta-substituted benzene or 1,3,5-substituted benzene is contacted with an adsorbent of a faujasite type zeolite containing a Ag cation and/or a Cu cation, whereby the meta-substituted benzene or 1,3,5-substituted benzene is separated and recovered as a raffinate component.

Abstract: Provided is a process for separating a halogenated toluene isomer from a feed containing a mixture of halogenated toluene isomers by adsorptive separation techniques using a Y type zeolite as an adsorbent and an alkyl aromatic hydrocarbon, 3,4-dihalotoluene or 4-haloorthoxylene as a desorbent.

Abstract: A substituted benzene isomer mixture containing a meta-substituted benzene or 1,3,5-substituted benzene is contacted with an adsorbent of a faujasite type zeolite containing a Ag cation and/or a Cu cation, whereby the meta-substituted benzene or 1,3,5-substituted benzene is separated and recovered as a raffinate component.

Abstract: Pressure swing selective adsorption-desorption process for separating at least one gaseous component from a gas mixture. In the adsorption step, a starting gas mixture is introduced at a pressure lower than that of a purge gas and, after completion of the adsorption step, at least a portion of the effluent gas from an adsorption column under execution of a purge is introduced into the adsorption column which has just completed the adsorption step and is about to enter upon the purge step, thereby pressurizing the latter adsorption column.

Abstract: A feed containing a mixture of at least two alkylphenol isomers is contacted with a zeolite adsorbent to allow an alkylphenol isomer in the mixture to be selectively adsorbed on the adsorbent, and then the adsorbent is contacted with an aliphatic ketone desorbent to desorb the adsorbed isomer.

Abstract: In the separation of cyclohexene from a feed which contains cyclohexene and cyclohexane, the feed is contacted with a type X and/or type Y aluminosilicate zeolite, thereby adsorbing cyclohexene selectively on the zeolite, and then the zeolite which adsorbed cyclohexene is contacted with a trimethylbenzene to desorb cyclohexene.