Gary Calhoun

US Patent:

7582698, Sep 1, 2009

Filed:

Dec 11, 2003

Appl. No.:

10/733027

Inventors:

Alexander V. Lubnin - Copley OH, US
Dennis Malaba - Akron OH, US
Vic Stanislawczyk - Strongsville OH, US
Gary D. Calhoun - Medina OH, US

Assignee:

Lubrizol Advanced Materials, Inc. - Cleveland OH

International Classification:

C08J 3/00
C08K 3/20
C08L 75/00
C08G 18/28
C08G 18/48
C08G 18/08
C08G 18/81
B32B 27/00
B32B 27/40

US Classification:

524589, 4284231, 524590, 524591, 524839, 524840, 524908, 525457, 525458, 525460, 525902, 525903, 528 45

Abstract:

A novel method of preparing an aqueous dispersion of non-uniform polyurethane particles which comprises (a) preparing at least two isocyanate-terminated polyurethane prepolymers having different hydrophilicities; (b) preparing a uniform mixture of said prepolymers; and (c) dispersing the mixed prepolymers in an aqueous medium. The resulting dispersion of the prepolymers may optionally be chain extended. This method enables the preparation of core-shell particles as well as particles of other morphologies, including “raspberry”, interpenetrating network, “salt-and-pepper”, “ice-cream cone” and particles of gradient composition. Similarly, an aqueous dispersion of two different polyurethane polymers may be obtained by first preparing at least two different isocyanate-terminated polyurethane prepolymers, preparing a uniform mixture of such prepolymers and thereafter dispersing the mixture in an aqueous medium.

US Patent:

8242205, Aug 14, 2012

Filed:

Aug 24, 2009

Appl. No.:

12/546025

Inventors:

Alexander V. Lubnin - Copley OH, US
Dennis Malaba - Akron OH, US
Vic Stanislawczyk - Medina OH, US
Gary D. Calhoun - Medina OH, US

Assignee:

Lubrizol Advanced Materials, Inc. - Cleveland OH

International Classification:

C08G 18/00
C08G 18/08
C08G 18/28
C08G 18/48
C08G 18/81
C08J 3/00
C08K 3/20
C08L 75/00

US Classification:

524591, 524589, 524590, 524839, 524840, 524908, 525457, 525458, 525460, 525902, 525903, 528 44, 528 45

Abstract:

A novel method of preparing an aqueous dispersion of non-uniform polyurethane particles which comprises (a) preparing at least two isocyanate-terminated polyurethane prepolymers having different hydrophilicities; (b) preparing a uniform mixture of said prepolymers, and (c) dispersing the mixed prepolymers in an aqueous medium. The resulting dispersion of the prepolymers may optionally be chain extended. This method enables the preparation of core-shell particles as well as particles of other morphologies, including “raspberry”, interpenetrating network, “salt-and-pepper”, “ice-cream cone” and particles of gradient composition. Similarly, an aqueous dispersion of two different polyurethane polymers may be obtained by first preparing at least two different isocyanate-terminated polyurethane prepolymers, preparing a uniform mixture of such prepolymers and thereafter dispersing the mixture in an aqueous medium.

US Patent:

58575138, Jan 12, 1999

Filed:

Jul 21, 1997

Appl. No.:

8/897385

Inventors:

Gary W. Calhoun - Avon OH
George Ducis - Brunswick OH

Assignee:

Brunswick Industrial Inc. - Cleveland OH

International Classification:

B22C 504
B22C 1528

US Classification:

164159

Abstract:

The assembly includes plural independently operated rotating shafts that contact the sand fill. As the fill is introduced into a first end of the vertical chute, the speed and rotational direction of the shafts with accompanying tines are controlled to regulate the feed rate and discharge of the fill to a molding chamber. This arrangement provides a more uniform density in the molding chamber which, in turn, results in improved quality in the cast product.