Abstract: A method of making a resin-impregnated molded fiber reinforced article including use of a thermosetting resin having a specified low viscosity and fast curing time with a specified fiber content for producing an article with improved strength.

Abstract: Method for treatment of contaminated chlorosilanes with lime to obtain an environmentally inept silica base product.

Abstract: A feed gas stream is separated by the use of one or more permeable membranes for bulk separation and for residual product gas recovery, in combination with a pressure swing adsorption process for the recovery of high purity product gas, e.g., hydrogen from mixtures thereof with methane. Waste gas from the PSA system is passed to one or more of such permeable membranes for enhanced product recovery, the recovery levels achieved being advantageously reconciled with the corresponding compression and other cost factors pertaining to the overall process for the production of such high purity product gas.

Abstract: In a combination solvent extraction-steam distillation process for the recovery of aromatic hydrocarbons, the improvement comprising(a) introducing high pressure steam into a steam ejector;(b) passing the steam from step (a) to a first heat exchanger where it exchanges heat with cooler lean solvent coming from the bottom of the distillation column and is condensed;(c) returning the lean solvent from step (b) to the bottom of the distillation column;(d) passing part of the condensate from step (b) to a second heat exchanger where it exchanges heat with the warmer lean solvent coming from the bottom of the distillation column, cooling the lean solvent and vaporizing the condensate; and(e) passing the vapor from step (d) to the steam ejector in step (a).

Abstract: An improved heated fluidized bed reactor and method for the production of high purity polycrystalline silicon by silane pyrolysis wherein silicon seed particles are heated in an upper heating zone of the reactor and admixed with particles in a lower reaction zone, in which zone a silane-containing gas stream, having passed through a lower cooled gas distribution zone not conducive to silane pyrolysis, contacts the heated seed particles whereon the silane is heterogeneously reduced to silicon.

Abstract: Curable thermosetting resin compositions comprising an epoxy resin having at least two 1,2-epoxy groups per molecule, an aromatic diamine hardener, and as a cure accelerator an aromatic trihydroxy compound are disclosed. The aromatic trihydroxy compound, such as for example, phloroglucinol, n-propyl gallate, or pyrogallol, improves the cure speed of the epoxy/aromatic diamine resin system, while at the same time producing cured compositions having excellent mechanical and thermal properties. The disclosed compositions find particular application in the preparation of composites by, e.g., filament winding procedures.

Abstract: This invention is directed to curable molding compositions containing a mixture of a poly(acrylate), a polymerizable ethylenically unsaturated monomer which serves to crosslink the poly(acrylate) to a thermoset product, a thermoplastic polymer low profile additive, and a free radical initiator mixture containing at least one initiator with a 10-hour half-life temperature (t.sub.1/2) of greater than about 90.degree. C. and at least one initiator with a 10-hour half-life temperature (t.sub.1/2) of less than about 90.degree. C. The curable molding compositions exhibit improved shrink control during the curing reaction. This invention is also directed to fiber reinforced thermoset resin articles which exhibit generally improved surface appearance quality and can be produced by a rapid injection molding process from the curable molding compositions.

Abstract: Described herein are curable molding compositions comprising a mixture of:(a) a half ester of an organic polyol characterized by the following empirical formula: ##STR1## wherein n is a number having an average value of about 1.5 to less than about 4, m is equal to the free valence of R less the average value of n, and R is the hydroxyl-free residue of an organic polyol which contained from 2 to 4, inclusive, hydroxyl groups in formula (I),(b) maleic anhydride,(c) acrylic or methacrylic acid or a functionalized derivative thereof having a molecular weight of less than 300, and(d) an ethylenically unsaturated monomer which is soluble in and copolymerizable with (a), (b), and (c) and which is different from (a), (b), and (c).The compositions can also contain one or more fibers with a melting point or a glass transition temperature above about 130.degree. C.