Robert A Buyny, 753111 Morgan Territory Rd, Clayton, CA 94517

6475596, Nov 5, 2002

Nov 30, 2000

09/726940

Hao-Ming Hsiao - San Ramon CA
Shaw Ming Lee - Danville CA
Robert Albert Buyny - Clayton CA
Cary Joseph Martin - Dublin CA

Hexcel Corporation - Pleasanton CA

B32B 502

428116, 428119, 428219, 428208, 428220, 442179, 442195

A core crush resistant prepreg for use in making a fiber reinforced composite panel structure is provided. The prepreg comprises a woven fabric consisting essentially of carbon fiber tow strands impregnated with a hardenable polymeric resin composition. Typically the fabric has an areal weight of from about 180 to about 205 grams per square meter. The prepreg has an average fiber tow aspect ratio of less than about 15. 4, a prepreg thickness of at least about 0. 245 mm, and a prepreg openness of at least about 1. 2 percent but less than about 6. 0 percent. Preferably, the resin composition is predominantly viscous in nature and has a tan value of between 0. 9 and 2. 0 at an elevated temperature between 70Â C. and 140Â C. , and an average epoxy functionality of greater than 2.

6663737, Dec 16, 2003

Jun 7, 2001

09/876310

Hao-Ming Hsiao - San Ramon CA
Shaw Ming Lee - Danville CA
Robert Albert Buyny - Clayton CA
Cary Joseph Martin - Dublin CA

Hexcel Corporation - Dublin CA

B32B 312

156160, 156161, 427445, 428116, 442195, 442179, 442181

A core crush resistant prepreg for use in making a fiber reinforced composite panel structure is provided. The prepreg comprises a woven fabric consisting essentially of carbon fiber tow strands impregnated with a hardenable polymeric resin composition. Typically the fabric has an areal weight of from about 180 to about 205 grams per square meter. The prepreg has an average fiber tow aspect ratio of less than about 15. 4, a prepreg thickness of at least about 0. 245 mm, and a prepreg openness of at least about 1. 2 percent but less than about 6. 0 percent. Preferably, the resin composition is predominantly viscous in nature and has a tan value of between 0. 9 and 2. 0 at an elevated temperature between 70Â C. and 140Â C. , and an average epoxy functionality of greater than 2.

7592072, Sep 22, 2009

Dec 14, 2005

11/300135

Robert A. Buyny - Dublin CA, US

Hexcel Corporation - Dublin CA

C08L 79/08
C08K 3/40
B32B 5/26
B32B 5/28
B32B 27/04
B32B 27/18

4284735, 428113, 428114, 428338, 428408, 428902, 525426, 525436

Prepreg composite materials that include a fiber layer and a prepreg resin composed of a bismaleimide resin component, a thermoplastic toughening agent and a resin distribution stabilizer. The bismaleimide component is an amorphous mixture of at least three different bismaleimide monomers and a co-curing agent. The prepreg is useful in panel construction where a honeycomb core is sandwiched between two sheets of composite material.

5278224, Jan 11, 1994

Aug 13, 1991

7/744562

Karen A. Olesen - Pleasanton CA
Robert A. Buyny - Clayton CA

Hexcel Corporation - Dublin CA

C08L 7700

524538

This disclosure addresses resin systems which contain thermosetting materials and thermoplastic modifiers, the resin systems being formed by dispersing particles of thermoplastic solids in the thermosetting materials, the particles being soluble in the resins at temperatures below the resin system gelation temperature. According to this disclosure, the systems are improved by the use of a blend of two types of thermoplastic material--a high glass transition temperature thermoplastic such as a poly(benzophenone-imide) and a high toughness thermoplastic such as a poly(ether-imide). By appropriate adjustment of the relative amounts of these two thermoplastics, resin system properties such as toughness, service temperature, thermal stability and solvent resistance can be adjusted to optimum levels.

5248711, Sep 28, 1993

Feb 16, 1989

7/312016

Robert A. Buyny - Clayton CA
Karen A. Olesen - Pleasanton CA

Hexcel Corporation - Pleasanton CA

C08L 7908
C08K 340
C08J 524

523500

Thermosetting resins for use in high performance fiber-reinforced composites are toughened without compromising their processability by the inclusion of micron-sized particles of thermoplastic material which are solid at ambient temperatures but solubilize in the resins at a temperature below the gel temperature of the thermosetting resin. By appropriate selection of the solubilization temperature (or temperature range) of the thermoplastic material, one achieves a composite product having intralaminar or interlaminar toughness emphasized or a combination of both. The invention is of particular utility when applied to bismaleimide resin systems.

5514444, May 7, 1996

Jun 17, 1994

8/261377

Robert Buyny - Clayton CA
Ernie Bishop - Livermore CA
Warren Myers - Walnut Creek CA

Hexcel Corporation - Pleasanton CA

B32B 312

428116

The present invention provides plastic-based fiber-reinforced honeycomb, and a process for its preparation. The fiber-reinforced honeycomb has high temperature durability yet can be fabricated and handled by simple techniques. Honeycomb structures in accordance with this invention have the strength, impact resistance and processing characteristics of thermoplastic materials and yet offer high temperature resistance and solvent resistance characteristics which permit such processing steps as the application of multiple coatings for purposes of density adjustment and enhancement of mechanical properties.

6261675, Jul 17, 2001

Mar 23, 1999

9/273637

Hao-Ming Hsiao - San Ramon CA
Shaw Ming Lee - Danville CA
Robert Albert Buyny - Clayton CA
Cary Joseph Martin - Dublin CA

Hexcel Corporation - Pleasanton CA

B32B 502

428219

A core crush resistant prepreg for use in making a fiber reinforced composite panel structure is provided. The prepreg comprises a woven fabric consisting essentially of carbon fiber tow strands impregnated with a hardenable polymeric resin composition. Typically the fabric has an areal weight of from about 180 to about 205 grams per square meter. The prepreg has an average fiber tow aspect ratio of less than about 15. 4, a prepreg thickness of at least about 0. 245 mm, and a prepreg openness of at least about 1. 2 percent but less than about 6. 0 percent. Preferably, the resin composition is predominantly viscous in nature and has a tan. delta. value of between 0. 9 and 2. 0 at an elevated temperature between 70. degree. C. and 140. degree. C. , and an average epoxy functionality of greater than 2. A method for evaluating core crush resistance properties of a prepreg is also provided.