Charles R Wiedrich

US Patent:

6423803, Jul 23, 2002

Filed:

Dec 15, 1999

Appl. No.:

09/461847

Inventors:

Vidhu J. Nagpal - Murrysville PA
Charles R. Wiedrich - Export PA

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

C08F 1824

US Classification:

526314, 526332, 526333

Abstract:

A polymerizable composition is described, which composition comprises a polyol(allyl carbonate) monomer, e. g. , diethylene glycol bis(allyl carbonate) monomer, and an additive represented by the general formula, wherein R and R are each selected independently from hydrogen, C -C linear or branched alkyl, cycloalkyl having from 5 to 7 carbon atoms in the cyclic ring, aryl, C -C linear or branched alkanoyl, cycloalkanoyl having from 5 to 7 carbon atoms in the cyclic ring and aroyl, R and R each being free of radically polymerizable ethylenically unsaturated groups; R O and R O are the same or different; R O is different than each of R O and R O; R O, R O and R O are each independently a divalent residue of an epoxide; x and z are each independently a number from 0 to 200, provided that the sum of x and z is greater than zero; and y is a number from 3 to 200. The additive is present in the composition of the present invention in an amount at least sufficient such that a polymerizate of the composition is substantially free of tinting defects, such as ferns and moons.

US Patent:

59524413, Sep 14, 1999

Filed:

Dec 30, 1997

Appl. No.:

9/000661

Inventors:

Robert D. Herold - Monroeville PA
Bo Wu - Delmont PA
Michael O. Okoroafor - Export PA
Charles R. Wiedrich - Murrysville PA

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

C08F 1824

US Classification:

526314

Abstract:

A polymerizable, liquid, substantially gel-free composition comprising a partially polymerized mixture of ethylenically unsaturated compounds wherein: (a) the mixture of ethylenically unsaturated compounds which was partially polymerized comprised a mixture of diethylene glycol (allyl carbonate) compounds each represented by Formula I: ##STR1## in which n is a positive integer, m is a positive integer, and the diethylene glycol (allyl carbonate) compound for which the value of n is 1 constituted from 25 to 75 area percent of the mixture of diethylene glycol (allyl carbonate) compounds; and (b) the ethylenic double bond utilization of the polymerizable, liquid, substantially gel-free composition is at least 3 percent. The polymerizable, liquid, substantially gel-free composition exhibits low shrinkage in the mold when polymerized.

US Patent:

57392439, Apr 14, 1998

Filed:

Nov 27, 1996

Appl. No.:

8/758612

Inventors:

Robert D. Herold - Monroeville PA
Charles R. Wiedrich - Murrysville PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C08F22220
C08F22026

US Classification:

526325

Abstract:

Describes polymerizable organic compositions of from about 5 to 90 weight percent of a first monomer component which is an alkoxylated diol, e. g. , alkoxylated bisphenol, having acrylate or methacrylate groups, e. g. , a dimethacrylate of bisphenol A having 25 to 35 ethoxy units, and from about 10 to 95 weight percent of a second monomer component which is different than the first monomer component and has at least three acrylate or methacrylate groups. There may also be present, from 0 to about 85 weight percent of a third polymerizable monomer component which has a single ethylenically unsaturated group that is polymerizable by free radical initiation. Substantially completely cured polymerizates prepared from such compositions may be used to prepare photochromic articles, e. g. , lenses, by incorporating a photochromic substance, e. g. , by thermal transfer, into the polymerizate.

US Patent:

49275461, May 22, 1990

Filed:

Nov 28, 1988

Appl. No.:

7/276728

Inventors:

Charles R. Wiedrich - Wadsworth OH
Edward J. Sare - Berkeley Heights NJ

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C02F 176

US Classification:

210755

Abstract:

Recreational water, e. g. , swimming pools, as opposed to industrial water, containing a source of free available halogen, e. g. , chlorine, is treated with amounts of a 2-oxazolidinone, e. g. , 4,4-dimethyl-2-oxazolidinone to thereby inhibit the growth of algae during the absence of biocidal amounts of free available halogen.

US Patent:

59730935, Oct 26, 1999

Filed:

Nov 27, 1996

Appl. No.:

8/757206

Inventors:

Randy E. Daughenbaugh - Turtle Creek PA
Robert D. Herold - Monroeville PA
Charles R. Wiedrich - Murrysville PA
John C. Crano - Murrysville PA

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

C08F 1824
C08L 3502
G03C 173

US Classification:

526314

Abstract:

Describes polymerizable organic compositions of a major amount of a first monomer component which is a polyol(allyl carbonate), e. g. , diethylene glycol bis(allyl carbonate), and from about 2 to 35 weight percent of a second monomer component which is an alkoxylated bisphenol (or hydrogenated bisphenol) having acrylate or methacrylate groups, e. g. , dimethacrylate of bisphenol A having 25 to 35 ethoxy units. Substantially completely cured polymerizates prepared from such compositions may be used to prepare photochromic articles, e. g. , lenses, by incorporating a photochromic substance, e. g. , by thermal transfer, into the polymerizate.

US Patent:

50891278, Feb 18, 1992

Filed:

Oct 19, 1990

Appl. No.:

7/600461

Inventors:

David M. Junker - Monroeville PA
Charles R. Wiedrich - Murrysville PA
Robert B. Simmons - Jeannette PA

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

C02F 176

US Classification:

210206

Abstract:

A chemical feeder having a collection reservoir and an erosion reservoir located within and spaced from the wall of the collection reservoir. An elongated cylinder is supported on the collection reservoir and the lower end of the cylinder is located in the collection reservoir. The collection reservoir has a water discharge outlet and the erosion reservoir has a water inlet with a valve to control the flow rate of water into the erosion reservoir. A canister containing solid chemical sanitizing elements is supported in the cylinder and its lower portion is located in the upper portion of the erosion reservoir. Openings are located in the lower end portion of the canister so that solid dry chemical sanitizing elements located in the lower end portion of the canister can be contacted by water in the erosion reservoir to erode and dissolve the solid elements to chemically treat water flowing out of the erosion reservoir into the collection reservoir.

US Patent:

60779217, Jun 20, 2000

Filed:

Dec 7, 1998

Appl. No.:

9/206144

Inventors:

Vidhu J. Nagpal - Murrysville PA
Charles R. Wiedrich - Murrysville PA

Assignee:

PPG Industries Ohio, Inc. - Cleveland OH

International Classification:

C08F 1824

US Classification:

526314

Abstract:

Described is a polymerizable organic composition comprising a polyol(allyl carbonate), e. g. , diethylene glycol bis(allyl carbonate), and an additive represented by the general formula R. sub. 2 --O--(R. sub. 3 O). sub. m --(CH. sub. 2 CH. sub. 2 O). sub. n-1 --CH. sub. 2 CH. sub. 2 --X wherein R. sub. 2 is a monovalent organic radical having a terminal ethylenically unsaturated group, e. g. , allyl, R. sub. 3 O is a divalent radical derived from an epoxide other than ethylene oxide, e. g. , butylene oxide, m is a number from 0 to 100, n is a number between 3 and 100, and X is selected from halide, hydroxyl, quaternary ammonium groups, the acid groups acetic acid, sulfonic acid, sulfuric acid, isethionic acid and phosphoric acid, salts of said acid groups, alkoxy groups and carboxylic acid ester groups. The additive is present in the composition in an amount at least sufficient such that a polymerizate, e. g. , a plus lens, obtained from said composition is substantially free of tinting defects, e. g.

US Patent:

49700200, Nov 13, 1990

Filed:

Jul 10, 1989

Appl. No.:

7/377676

Inventors:

Harlan B. Johnson - Rittman OH
Charles R. Wiedrich - Medina OH
Ernie L. Allen - Barberton OH
Peter P. Howell - New Martinsville OH

Assignee:

PPG Industries, Inc. - Pittsburgh PA

International Classification:

D06L 308
C01B 1106
C02F 176

US Classification:

25218728

Abstract:

Granular calcium hypochlorite containing from about 0. 001 to about 1. 0 weight percent of finely-divided polyfluorinated polymer, e. g. , polytetrafluoroethylene, dispersed throughout the granules is described. The product may be compressed and formed into shaped articles, e. g. , tablets. The granules may be prepared by admixing the polyfluorinated polymer with particulate calcium hypochlorite, compacting the mixture and granulating the compacted product. Tablets prepared from the polyfluorinated polymer containing granular calcium hypochlorite dissolve in water at a rate slower than tablets prepared without the polyfluorinated polymer. Finely-divided calcium hypochlorite powder, e. g. , powder of less than about 10 microns in size, is rendered more conveyable and compactible by the addition of the finely-divided polyfluorinated polymer; and mixtures of finely-divided calcium hypochlorite powder and particulate calcium hypochlorite is rendered more readily compactible.