Rimantas A Glemza

US Patent:

6670302, Dec 30, 2003

Filed:

Oct 31, 2002

Appl. No.:

10/285035

Inventors:

Rimantas Glemza - Baltimore MD
Dean A. Denton - Baltimore MD

Assignee:

W. R. Grace Co.-Conn - Columbia MD

International Classification:

B01J 2108

US Classification:

502233, 502234, 502103, 526104, 526129, 526348, 526106

Abstract:

High melt index polyolefins have been obtained with chromium silica catalysts under conventional polymerization conditions without the use of titanium or other additives. The useful chromium silica catalysts have a pore volume in the range of 1. 9-2. 9 cc/g and a narrow pore size distribution. The silica is a silica gel preferably obtained from a low solids, rapid gelation process.

US Patent:

6734131, May 11, 2004

Filed:

Apr 10, 2002

Appl. No.:

10/120289

Inventors:

Keng-Yu Shih - Columbia MD
Dean Alexander Denton - Baltimore MD
Rimantas Glemza - Baltimore MD

Assignee:

W. R. Grace Co.-Conn. - Columbia MD

International Classification:

B01J 2116

US Classification:

502 80, 502254, 502 86, 502103, 502 84, 526104, 526348, 526129

Abstract:

A chromium containing catalyst wherein the chromium atom is in one of its higher valence states and is immobilized to a support-agglomerate composed of at least one inorganic oxide component and at least one ion-containing layered component.

US Patent:

6946420, Sep 20, 2005

Filed:

Apr 10, 2002

Appl. No.:

10/120314

Inventors:

Keng-Yu Shih - Columbia MD, US
Dean Alexander Denton - Baltimore MD, US
Rimantas Glemza - Baltimore MD, US

Assignee:

W. R. Grace & Co.-Conn - Columbia MD

International Classification:

B01J031/18

US Classification:

502155, 502103, 502117, 502167, 502120, 502 80, 526161, 526172

Abstract:

The present invention is directed to a coordinating catalyst system comprising at least one pre-catalyst selected from late transition metal bidentate or tridentate ligand containing compounds, at least one support-agglomerate having chromium immobilized thereto (e. g. , spray dried silica/clay agglomerate), and optionally at least one organometallic compound in controlled amounts, and methods for preparing the same. The resulting catalyst system exhibits enhanced activity for polymerizing olefins and yields polymer products having very good morphology.

US Patent:

6958375, Oct 25, 2005

Filed:

Apr 10, 2002

Appl. No.:

10/120310

Inventors:

Keng-Yu Shih - Columbia MD, US
Dean Alexander Denton - Baltimore MD, US
Rimantas Glemza - Baltimore MD, US

Assignee:

W.R. Grace & Co.-Conn. - Columbia MD

International Classification:

C08F004/44
B01J031/38

US Classification:

526 89, 526127, 526161, 526171, 502104, 502118, 502120, 502152, 502167, 502232, 502235, 502236, 502239, 502242

Abstract:

The present invention is directed to a novel one-step method for forming a supported catalyst complex of high activity by substantially simultaneously contacting a bidentate or tridentate ligand forming compound, a transition metal compound and a chromium immobilized Lewis acid support-agglomerate. The catalyst can be formed prior to polymerization of olefins or within the polymerization reaction zone.

US Patent:

50304313, Jul 9, 1991

Filed:

Jun 7, 1989

Appl. No.:

7/362545

Inventors:

Rimantas Glemza - Baltimore MD

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

B01J 2718

US Classification:

423305

Abstract:

Aluminum phosphate compositions are provided which are characterized simultaneously by high porosity and phosphorous-to-aluminum ratios of approximately 1. The high porosity of these compositions is a function of high pore volume coupled with low surface area, resulting in high average pore diameter. These materials have excellent properties as catalysts and catalyst supports.

US Patent:

RE349119, Apr 18, 1995

Filed:

Jul 1, 1993

Appl. No.:

8/085656

Inventors:

Rimantas Glemza - Baltimore MD

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

B01J 2718

US Classification:

423305

Abstract:

Aluminum phosphate compositions arc provided which are characterized simultaneously by high porosity and phosphorous-to-aluminum ratios of approximately 1. The high porosity of these compositions is a function of high pore volume coupled with low surface area, resulting in high average pore diameter. These materials have excellent properties as catalysts and catalyst supports.

US Patent:

43036414, Dec 1, 1981

Filed:

May 24, 1978

Appl. No.:

5/909149

Inventors:

Robert B. DeWolf - Glen Burnie MD
Rimantas Glemza - Baltimore MD

Assignee:

W. R. Grace & Co. - New York NY

International Classification:

A61K 716

US Classification:

424 49

Abstract:

Dentifrice compositions containing a hydrous silica gel having a water content of from about 20 to about 60 weight percent are disclosed. The abrasiveness of the gel is increased by contacting the gel with an alkaline medium to provide a gel pH of about 6 to about 10 and/or preparing the gel by drying and grinding a silica hydrogel that has been washed with an aqueous acidic solution having a temperature of from about 80. degree. to about 100. degree. F.

US Patent:

52927016, Mar 8, 1994

Filed:

May 10, 1991

Appl. No.:

7/698524

Inventors:

Rimantas Glemza - Baltimore MD
Yves O. Parent - Golden CO

Assignee:

W. R. Grace & Co.-Conn. - New York NY

International Classification:

B01J 2102

US Classification:

502202

Abstract:

Aluminum phosphate compositions are provided which are characterized simultaneously by high porosity and phosphorous-to-aluminum ratios of approximately 1. The high porosity of these compositions is a function of high pore volume coupled with low surface area, resulting in high average pore diameter. These materials have excellent properties as catalysts and catalyst supports. Methods of making the compositions are also provided.