Union Carbide Corporation

Nan S Chu

Bernard Kanner

You-Ling Fan

Lawrence Marlin

Meyer R Rosen

Kenrick M Lewis

George L Brode

Curtis L Schilling

Frank Dominic Mendicino

Robert A Cupper

Priscilla B Stanley

Philip F Wolf

Nye A Clinton

A vapor phase process for the synthesis of alkoxysilanes of the general formula HSi(OR'').sub.x (R').sub.3-x which comprises reacting

Vapor phase alcoholysis of aminosilanes and carbamatosilanes

This invention relates to an improved process for preparing, purifying and/or storing methacryloxy or acryloxy containing organosilicon compounds without the undesirable polymerization normally associated with the methacrylate bonds. In an alternative embodiment, the process is even further improved with the addition of certain stabilizers, and in particular diketone or ketoester stabilizers.

Method for preparing methacryloxy and acryloxy containing organosilanes

Described herein is a process for flocculating phosphatic slimes which comprises (a) forming a concentrated aqueous solution from a water-soluble ter-or higher polymer water-in oil emulsion, (b) diluting said concentrated aqueous solution of ter-or higher polymer formed in step (a) with additional water, (c) mixing the diluted solution of (b) with phosphatic slimes under appropriate floc forming conditions and (d) allowing the suspended solids to settle from said slime to form an essentially clear aqueous supernatant.

Process for flocculating phophatic slimes

Described herein are water soluble acrylamide containing polymers having an intrinsic viscosity of at least about 15 dl/g. These polymers are suitable for use in water purification.

High molecular weight water soluble polymers

Described herein is a process for the preparation of a novel essentially nonaqueous glutaraldehyde precursor which is capable of rapidly generating glutaraldehyde upon addition to water. The precursor is prepared by the hydration of 2-alkoxy-3, 4-dihydropyran in the presence of an acid catalyst.

Preparation of a glutaraldehyde precursor

A platinum catalyzed addition of allylamine and N-substituted allyl amines to trialkoxysilanes or alkylalkoxysilanes is improved by running the reaction under pressure at 110.degree.-210.degree. C. and in the presence of a reaction promoter. As a result, the time and the amount of platinum catalyst required for the reaction are significantly reduced and conversion and yield of the product increased.

Preparation of aminopropyltrialkoxysilanes and/or aminoalkylalkoxysilanes

Polymeric antioxidants comprising polyorganosiloxane backbones having joined thereto, by non-hydrolyzable linkages, aromatic antioxidant moieties.

Polymeric antioxidants

Polymeric dyes of the present invention have the formula: ##STR1## wherein Me represents the methyl group, x can range from 2 to 100, y can range from 20 to 300, and the ratio of x:y is at least 1:10 and is preferably from 1:5 to 1:1. The symbol L represents the divalent group which connects the chromophoric moiety and the polysiloxane moiety together by covalent bonds. L is conveniently a saturated divalent aliphatic group which connects the silicon atom to the chromophoric group by a non-hydrolyzable covalent bond. Chromo represents an aromatic chromophore which imparts color to the polymer molecule. The polmeric dyes of the present invention can be used to dye natural fibers such as silk, wool, and cotton and to color plastics such as nylon, Dynel, Acrilan, acetate, and viscore. In addition, the polymeric dyes can also be used as a food dye when water soluble groups are present (e.g., on the chromophores) to impart water solubility to the polymeric dye. Because of the stability and the high molecular weight of these polymeric dyes, they can be used as colorants for food as well as in pharmaceutical and cosmetic applications.

Aromatic chromophoric substituted polysiloxane dyes

Synthetic polyol ester fluids useful as lubricants or hydraulic fluids have been prepared by the esterification of ethylene-methyl formate telomerization products with polyols containing from two to about six hydroxyl groups.

Polyol ester functional fluids

A process for producing water swellable poly(alkylene oxide) which comprises introducing into a reaction zone an admixture of poly(alkylene oxide) having a molecular weight of at least 100,000 and an inert hydrocarbon solvent containing a free radical catalyst; adding to said reaction zone acrylic acid, heating said reaction zone at a temperature within the range of about 40.degree.C to about 100.degree.C for a time sufficient to produce said water swellable poly(alkylene oxide), and thereafter recovering said water swellable poly(alkylene oxide) from said reaction zone.

Water swellable poly(alkylene oxide)

A process for producing powdered chemically crosslinked poly(alkylene oxide) of molecular weight of at least 100,000 which comprises contacting poly(alkylene oxide) with a suitable crosslinking agent in the presence of a free radical catalyst, and a liquid medium containing a solvent-nonsolvent mixture for said poly(alkylene oxide) wherein the non-solvent portion constitutes at least 35% and up to 100% by weight of the liquid medium, at a temperature and for a time sufficient to crosslink said poly(alkylene oxide).

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Hartsdale, NY, United States of America

Nan S Chu