Abstract:
Polymer bound antioxidants in which the antioxidant stabilizer groups are chemically bound to polymers or copolymers by an acylaminoimide or diacylhydrazide function are prepared by reacting hydrazido substituted antioxidants with some or all of the anhydride groups of anhydride containing polymers or copolymers to form a polymer with recurring units selected from the formulas or both wherein the units occur, e.g., in the polymer backbone, x is 0 or 1, R¹ and R² are, e.g., hydrogen and G is, e.g., wherein R³ is t-alkyl of 4-8 carbons, R⁴ is, e.g., hydrogen and X¹ is, e.g., -N(R)-C(=O)-(CH₂) b - wherein R is e.g., hydrogen and b is 0, 1 or 2. The concentration of the stabilizers bound to the polymer may be readily varied depending upon the particular end-use of said polymer. Polymer with high concentrations of bound antioxidants can be used as masterbatches to stabilize other polymer systems.
Abstract:
Alkanedisulfonic acids, particularly methanedisulfonic acid (methionic acid), can be prepared by reacting the corresponding alkanesulfonic acid with chlorosulfonic acid. The reaction is carried out by heating the reactants with agitation, preferably under substantially anhydrous conditions in the presence of oxygen and at substantially atmospheric pressure. Particularly good yields are obtained using an activated carbon co-catalyst.
Abstract:
Dialkanesulfonyl peroxide (RSO₂-0-0-0₂SR) is prepared in a continuous process by electrolyzing the corresponding alkanesulfonic acid at an elevated temperature (to keep the peroxide product in solution ) in a continmuous-flow electrolysis cell, removing the solution from the electrolytic cell, cooling the solution to precipitate the peroxide product, and recycling the supernatant alkanesulfonic acid back to the cell.
Abstract:
A sprayable insecticidal composition of low fish toxicity of a mixture in water of microcapsules comprised of a pyrethroid (synthetic pyrethrin) contained within an encapsulating wall of a cross-linked polymeric material, and methods of preparation and method of use of the composition on a wide variety of crops and aquatic sites infested with a broad spectrum of undesirable insects.
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:
Disclosed is a process for the preparation of cis/trans 1,1,1,3-tetrafluoro-2-propene (1234 ze) which comprises (a) contacting 1,1,1,3,3-pentafluoropropane (245fa) with an alkaline solution, preferably an aqueous or alcoholic solution of a base such as KOH, NaOH, Ca(OH) 2 or Mg(OH) 2 , or with a chromium-based catalyst, such as fluorided Cr 2 O 3 or fluorided Cr/Ni/Alf 3 , and (b) recovering cis/trans 1,1,1,3-tetrafluoro-2-propene from the reaction mixture.
Abstract translation:本发明公开了制备顺式/反式1,1,1,3-四氟-2-丙烯(1234ze)的方法,该方法包括(a)使1,1,1,3,3-五氟丙烷(245fa)与 碱性溶液,优选碱如KOH,NaOH,Ca(OH)2或Mg(OH)2的水溶液或醇溶液,或与铬基催化剂如氟化Cr2O3或氟化Cr / Ni / 和(b)从反应混合物中回收顺式/反式1,1,1,3-四氟-2-丙烯。
Abstract:
A solar-control glass that has acceptable visible light transmission, absorbs near infrared wavelength light (NIR) and reflects midrange infrared light (low emissivity mid IR) along with a preselected color within the visible light spectrum for reflected light is provided. Also provided is a method of producing the improved, coated, solar-controlled glass. The improved glass has a solar energy (NIR) absorbing layer comprising tin oxide having a dopant such as antimony and a low emissivity control layer (low emissivity) capable of reflecting midrange infrared light and comprising tin oxide having fluorine and/or phosphorus dopant. A separate iridescence color suppressing layer as described in the prior art is generally not needed to achieve a neutral (colorless) appearance for the coated glass, however an iridescence suppressing layer or other layers may be combined with the two layer assemblage provided by the present invention. Ifdesired, multiple solar control and/or multiple low emissivity layers can be utilized. The NIR layer and the low emissivity layer can be separate portions ofa single tin oxide film since both layers are composed of doped tin oxide. A method of producing the coated solar control glass is also provided.
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 °C, and permits coating glass having a temperature from 450 to 650 °C at deposition rates higher than 350 Å/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 is described for strengthening or restoring strength to a flat brittle oxide substrate (12) which includes the steps of coating the edges of the brittle oxide substrate (12) with a strengthening composition without coating a significant portion of the major flat surfaces of the substrate (12). The strengthened brittle oxide substrate (12), such as glass, and a window containing as a window pane the edge strengthened glass (12) are also provided.
Abstract:
A glass substrate having a coating comprising a film containing a metal oxide, an oxide of silicon and an oxide of phosphorus or boron. The metal oxide is preferably selected from the group of tin oxide, germanium oxide, titanium oxide, aluminium oxide, zirconium oxide, zinc oxide, indium oxide, cadmium oxide, tungsten oxide, vanadium oxide, chromium oxide, molybdenum oxide, iridium oxide, nickel oxide, and tantalum oxide.