Abstract:
The present invention comprises a curable composition comprising: (i) a blocked reactive component comprising a blocked isocyanate or a blocked isothiocyanate; (ii) a functional component containing reactive hydrogen; (iii) a triorganotin catalyst for promoting the reaction of the blocked reactive component with the functional component. The composition may also be admixed with water. A co-catalyst may also be employed based on Cu, Zn, Ni, Fe, Co, V, Sb and Bi and especially oxides, salts or chelates of said metal where said metals are divalent. The invention also relates to a method for curing a blocked isocyanate or blocked isothiocyanate at a temperature below about 150 DEG C which comprises combining a triorganotin catalyst with the blocked reactive component and functional component and heating at a temperature less than about 150 DEG C to obtain a cured urethane or thiourethane.
Abstract:
Active Rhodium catalyst and impurities are separated from a hydroformylation process stream containing both active and inactive organo-rhodium catalyst by binding active catalyst and impurities to an acidic ion exchange resin containing an acidic group. The purified hydroformylation stream can be returned to the hydroformylation reactor. All or a portion of inactive rhodium can be reactivated before recycling purified hydroformylation process stream to the reactor. During regeneration of the resin, a neutral solvent is used first to remove impurities which are discarded, then an acidic solvent is used to remove active organic rhodium catalyst from the resin. Such active catalyst can be rehydrided and returned to the hydroformylation reactor. An ion exchange resin having at least one acid group disposed on a silica backbone and an active organo-rhodium complex from a hydroformylation process stream bound to the resin can be produced.
Abstract:
A substrate is provided with a resistant coating by the chemical-vapor deposition of hard material, by passing a gaseous mixture of a precursor of the material, an accelerant, an oxidant, and a carrier gas over the substrate surface, and then removing the by-products and unreacted materials; mixtures of hard materials are obtained by using a co-reagent in the gaseous mixture. The substrate is preferably heated. The figure shows a schematic of the apparatus which includes the precursor (102), the accelerant (104) which are vaporized and transferred to a reactor (120). A mixture of chromium oxide and tin oxide is the preferred coating material, obtained by decomposition of chromyl chloride and monobutyltintrichloride on the substrate surface in the presence of methylisobutylketone and air. Other metal mixtures can also be used.
Abstract:
A method is described for strengthening or restoring strength to a brittle oxide substrate which includes the steps of coating the brittle oxide substrate with an aqueous solution containing a silane-based composition, and curing the coating to form a transparent layer on the brittle oxide substrate. Also disclosed are novel compositions used to coat brittle oxide substrates, and silane-coated brittle oxide containers.
Abstract:
A coated-glass article is prepared by the chemical-vapor deposition of a mixture of a tin oxide precursor, a silicon dioxide precursor and an accelerant such as triethyl phosphite at deposition rates higher than 350 ANGSTROM /sec. onto glass having a temperature from 450 to 650 DEG C. The layer of material deposited can be combined with other layers to produce an article with specific properties such as controlled emissivity, refractive index, abrasion resistance, or appearance.
Abstract:
New and novel poly(monoperoxycarbonates) of general structure (A), where R, R and n are defined in the summary of the invention such as 1,1,1-tris(t-butylperoxycarbonyloxymethyl)ethane, intermediates for their preparation as well as processes for their preparation and use are disclosed. The monoperoxycarbonate compounds are useful in initiating the polymerization of ethylenically unsaturated monomers, particularly styrene, curing of unsaturated polyester resins, and in modifying the molecular weight of polymers such as by cross-linking or controlled chain degradation.
Abstract:
A composition for coating glass by chemical-vapor deposition comprises a mixture of a tin oxide precursor monobutyltin trichloride, a silicon dioxide precursor tetraethylorthosilicate, and an accelerant such as triethyl phosphite; the composition is gaseous below 200 DEG C, and permits coating glass having a temperature from 450 to 650 DEG C at deposition rates higher than 350 ANGSTROM /sec. The layer of material deposited can be combined with other layers to produce an article with specific properties such as controlled emissivity, refractive index, abrasion resistance, or appearance.
Abstract:
A method for coating glass by chemical-vapor deposition below 200 DEG C, at atmospheric pressure of a gaseous mixture of a tin oxide precursor, a silicon dioxide precursor and an accelerant such as triethyl phosphite provides deposition rates greater than 350 ANGSTROM per second. The layer of material deposited can be combined with other layers to produce an article with specific properties such as controlled emissivity, refractive index, abrasion resistance, and appearance.