Raymond Alfonsas Plepys

6376625, Apr 23, 2002

Aug 25, 1999

09/383171

James P. Cosman - Sarnia, CA
Paul D. Bettge - Lake Jackson TX
Richard J. Elwell - Terneuzen, NL
Raymond A. Plepys - Lake Jackson TX

The Dow Chemical Company - Midland MI

C08F 208

526 67, 526 62, 5263442

This invention involves several ways for improving a coalescing process for purifying a crude polyether. In one aspect, particulate zirconium dioxide is selected as a coalescing medium. In a second aspect, alkali metal catalyst is recovered and recycled to make additional polyether product. In a third aspect, a polyether stream obtained from the coalescing step is purified by stripping water in at least two phases, the first of which involves moderate conditions so that water but not allyl alcohol or higher molecular weight impurities are removed from the polyether, and the second of which involves more stringent stripping conditions. In a fourth aspect, crude polyether that is subjected to a holding period before undergoing a coalescing step is mixed with water to minimize the formation of impurities that are believed to compatibilize the aqueous and polyether phases. In a fifth aspect, the coalescing process is conducted under a non-oxidizing atmosphere.

20010046711, Nov 29, 2001

Mar 26, 2001

09/817686

Phan Pham - Angleton TX, US
Sofia Hohnholt - Brookline MA, US
Raymond Plepys - Lake Jackson TX, US
Purnendu Dasgupta - Lubbock TX, US

G01N031/22

436/100000

A chemical analysis method for the determination of a base (or an acid) in a nonaqueous liquid (such as a polyol) which method can be automated and placed on-line in a chemical production facility. The instant invention includes two steps. The first step is to mix an acid-base indicator (for example, bromocresol green) with the non-aqueous liquid to produce a colored reaction product between the base or acid and the acid-base indicator. The second step is to determine the intensity of the color of the colored product.

62554344, Jul 3, 2001

Apr 27, 1999

9/300232

Philip W. McGraw - Lake Jackson TX
Robert H. Whitmarsh - Lake Jackson TX
Paul E. Cranley - Lake Jackson TX
Raymond A. Plepys - Lake Jackson TX

The Dow Chemical Company - Midland MI

C08G 5968
C07C 4311

528 92

The invention is a high molecular weight polyether polyol prepared by the reaction of one or more compounds having one or more active hydrogen compounds with one or more alkylene oxides in the presence of a catalyst comprising calcium having counterions of carbonate and a C. sub. 6-10 alkanoate in a solvent or dispersant which does not contain active hydrogen atoms. The polyether polyol prepared preferably has an equivalent weight of from about 1000 to about 20,000, a polydispersity of about 1. 3 or less and a residual catalyst level of from about 0 to about 2000 parts per million (ppm).

41547675, May 15, 1979

Mar 7, 1977

5/775135

Raymond A. Plepys - Lake Jackson TX
Edgar F. Hoy - Midland MI

The Dow Chemical Company - Midland MI

C07C 4300
C07C 4330

260609F

Reaction of the diphenyl ether with formaldehyde, an alcohol, water and acid catalyst produces a mixture of condensation products that can be cured to useful, thermally stable resins. These condensation products are also useful as functional fluids in capacitors and other electrical devices.

40454100, Aug 30, 1977

Oct 17, 1975

5/623511

Raymond A. Plepys - Lake Jackson TX

The Dow Chemical Company - Midland MI

C08G 1604

260 52

Novel copolymer resins having the repeating unit ##STR1## WHEREIN EACH R is independently alkyl of 1 to about 10 carbon atoms or halogen, z is oxygen or sulfur, the dashed line is an optional chemical bond, the group represented by z taken with the dashed line represents dibenzofuran and dibenzothiophene moieties, or mixtures thereof, each R" is hydrogen or ##STR2## wherein each R' is a hydrocarbon or substituted hydrocarbon radical of from 2 to about 11 carbon atoms, n averages about 3-10, each m is 0-2 and p and q are each 0 or 1 with the proviso that the sum of p and q has an average value of 0. 1-1. 0 and there is an average of at least one carboxyl group per polymer molecule, are prepared by reacting a mixture comprising a hydroxymethylated diphenylether-formaldehyde copolymer with an anhydride of the formula ##STR3## wherein R' is a hydrocarbon or substituted hydrocarbon radical of from 2 to about 11 carbon atoms, at a temperature between about 120. degree. and about 170. degree. C. The copolymer resins form stable aqueous solutions in the presence of base which, when heated in the presence of a water-soluble curing agent, such as hexamethoxymethylmelamine, yield glossy, flexible and impact-, solvent-, and water-resistant films.

46862420, Aug 11, 1987

Jan 31, 1986

6/824407

Robert B. Turner - Lake Jackson TX
Richard D. Peffley - Lake Jackson TX
Raymond A. Plepys - Lake Jackson TX
Ralph D. Priester - Lake Jackson TX
Manuel Gonzales - Lake Jackson TX
Kimbley A. Bushman - Lake Jackson TX

The Dow Chemical Company - Midland MI

C08G 1814
C08G 1832
C08G 1850

521137

This invention comprises a process whereby an amine functional compound having an equivalent weight of at least about 400 is reacted with an excess of a polyisocyanate to form an isocyanate-terminated prepolymer or quasi prepolymer, which polymer or quasi prepolymer is reacted with an isocyanate-reactive material which is preferably a relatively low equivalent weight polyol or mixture thereof with an additional amount of said amine functional compound or a relatively high equivalent weight polyol to form a polyurea containing polymer which is preferably non-cellular or microcellular.

50950614, Mar 10, 1992

Jul 13, 1990

7/554054

Johnny Chavez - Lake Jackson TX
Raymond A. Plepys - Lake Jackson TX
Craig A. McClure - Houston TX
Van A. Kent - Lake Jackson TX
Richard N. Gerstle - Lake Jackson TX

The Dow Chemical Company - Midland MI

C08K 506

524376

A process for reducing the amount of propenyl polyethers in hydroxy-functional polyethers comprising (1) contacting a neutral hydroxy-functional polyether, containing a propenyl polyether and water, and an acid catalyst soluble in the hydroxy-functional polyether under reaction conditions sufficient to convert at least a portion of the propenyl polyether to propionaldehyde; (2) contacting the product of step (1) and an epoxy compound to substantially scavenge the acid catalyst; and (3) stripping the product of step (2) to substantially remove the epoxy compound the the propionaldehyde. The resulting hydroxy-functional polyethers contain reduced amounts of propenyl polyethers and can therefore be used to prepare polyurethane foams having a reduced tendency to discoloration.

46580077, Apr 14, 1987

May 7, 1985

6/731253

Maurice J. Marks - Lake Jackson TX
Raymond A. Plepys - Lake Jackson TX

The Dow Chemical Company - Midland MI

C08G 1822
C08G 1838
C08G 1864

528 55

This invention is an improvement in a process by which a polyepoxide and a polyisocyanate are reacted to form an oxazolidone containing polymer or polymer precursor. This improvement comprises conducting said reaction in the presence of a catalytic amount of an organoantimony iodide catalyst. In such improved process, the oxazolidone forming reaction proceeds much more rapidly than the trimerization reaction of the polyisocyanate or the homopolymerization of the polyepoxide. As a result, the product polymer or polymer precursor contains a surprisingly small proportion of isocyanurates. In addition, the overall rate of reaction is substantially increased as compared to that achieved with conventional catalysts, thereby reducing the time and stringency of conditions required to form the desired product.