Ronald C Stephenson

US Patent:

56022263, Feb 11, 1997

Filed:

Jun 6, 1995

Appl. No.:

8/467195

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Bellevue WA
Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C08G 6300

US Classification:

528181

Abstract:

The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (T1-OC. sub. 2 H. sub. 5), in the solvent.

US Patent:

54036666, Apr 4, 1995

Filed:

Jun 21, 1993

Appl. No.:

8/079999

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Bellevue WA
Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - DE

International Classification:

C08J 524
B32B 3104

US Classification:

4284744

Abstract:

The thermooxidative stability and thermomechanical properties of advanced composites which use high performance resin matrices such as polyimides and high strength carbon fibers may be improved by sizing the carbon fibers with uncapped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## Wherein R. sub. 2 =a trivalent organic radical and generally benzenetriyl; R. sub. 3 =a divalent organic radical; and n=an integer sufficiently large to provide a strong, tough coating. Useful capped, linear polyamideimide oligomers may be formed by including end caps with an unsaturated functionality (Y) containing a residue selected from the group consisting of: ##STR2## wherein R. sub. 1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof; j=0, 1, or 2; i=1 or 2; G=--CH. sub. 2 --, --O--, --S--, --SO. sub.

US Patent:

48682705, Sep 19, 1989

Filed:

Nov 17, 1987

Appl. No.:

7/121964

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Bellevue WA
Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C08F 7532
C08F 7322
C07D40314
C07D41314
C07D41714

US Classification:

528170

Abstract:

High thermal stabilities are achievable in linear or multidimensional sulfone, solvent resistant oligomers by incorporating oxazole, thiazole, or imidazole linkages into the oligomer backbone. Blended oligomers of crosslinking oligomers and noncrosslinking compatible polymers are also described. The oligomers include residues of four-functional compounds of the formula: ##STR1## wherein M=--CO--, --S--, --O--, --SO. sub. 2 -- or --(CF. sub. 3). sub. 2 C--; and Y=--OH, --SH, or --NH. sub. 2. In an improved method, the reactants are condensed at or below ambient temperature in the presence of pyridine in a suitable solvent such as N,N'-dimethylacetamide (DMAC).

US Patent:

51552060, Oct 13, 1992

Filed:

Apr 28, 1989

Appl. No.:

7/345062

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Bellevue WA
Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C08G 7314
C08G 6926
C08L 7908

US Classification:

528322

Abstract:

The thermooxidative stability and thermomechanical properties of advanced composites which use high performance resin matrices such as polyimides and high strength carbon fibers may be improved by sizing the carbon fibers with uncapped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## wherein R. sub. 2 =a trivalent organic radical and generally benzenetriyl; R. sub. 3 =a divalent organic radical; and n=an integer sufficiently large to provide a strong, tough coating. Useful capped, linear polyamideimide oligomers may be formed by including end caps with an unsaturated functionality (Y) containing a residue selected from the group consisting of: ##STR2## wherein R. sub. 1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof; j=0, 1, or 2; i=1 or 2; G=--CH. sub. 2 --, --O--, --S--, --SO. sub.

US Patent:

RE348201, Jan 3, 1995

Filed:

Nov 15, 1993

Appl. No.:

8/155033

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Post Falls ID
Ronald R. Stephenson - Renton WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C08G 7314
C08K 520
B32B 900

US Classification:

528322

Abstract:

Sizing for carbon fibers with uncapped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## Wherein R. sub. 2 =a trivalent organic radical and generally benzenetriyl; R. sub. 3 =a divalent organic radical; and n=an integer sufficiently large to provide a strong, tough coating. Useful capped, linear polyamideimide oligomers may be formed by including end caps with an unsaturated functionality (Y) containing a residue selected from the group consisting of: ##STR2## wherein R. sub. 1 =lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof; j=0, 1 or 2; i=1 or 2; G=--CH. sub. 2 --, --O--, --S--, --SO. sub. 2 --, --SO--, --CO--, --CHR--, or --CR. sub.

US Patent:

57566453, May 26, 1998

Filed:

Jun 6, 1995

Appl. No.:

8/470370

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Bellevue WA
Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seatte WA

International Classification:

C08G 6382

US Classification:

528282

Abstract:

The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (Tl-OC. sub. 2 H. sub. 5), in the solvent.

US Patent:

52390462, Aug 24, 1993

Filed:

Aug 24, 1992

Appl. No.:

7/934768

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Bellevue WA
Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C08C 7314
C08K 520
B32B 900

US Classification:

528322

Abstract:

Sizing for carbon fibers with uncapped or capped linear polyamideimides. The uncapped linear polyamideimides useful as carbon fiber sizings generally contain repeating units having the general formula: ##STR1## Wherein R. sub. 2 =a trivalent organic radical and generally benzenetriyl; R. sub. 3 =a divalent organic radical; and n=an integer sufficiently large to provide a strong, tough coating. Useful capped, linear polyamideimide oligomers may be formed by including end caps with an unsaturated functionality (Y) containing a residue selected from the group consisting of: ##STR2## wherein R. sub. 1 =lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof; j=0, 1, or 2; i=1 or 2; G=--CH. sub. 2 --, --O--, --S--, --SO. sub. 2 --, --SO--, --CO--, --CHR--, or --CR. sub.

US Patent:

56189079, Apr 8, 1997

Filed:

Jun 5, 1995

Appl. No.:

8/461335

Inventors:

Hyman R. Lubowitz - Rolling Hills Estates CA
Clyde H. Sheppard - Bellevue WA
Ronald R. Stephenson - Kirkland WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

C08G 6300
C08G 6368

US Classification:

528282

Abstract:

The yield of fully substituted, multidimensional aromatic hubs in the condensation of hydroxyl and acid halide functionalities is improved by adding a thallium catalyst, such as thallium ethoxide (Tl--OC. sub. 2 H. sub. 5), in the solvent.