Willard E Alexander

US Patent:

52737039, Dec 28, 1993

Filed:

Aug 13, 1992

Appl. No.:

7/929272

Inventors:

Willard E. Alexander - Midland MI
Timothy L. Faley - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

D01D 1002
D01D 1006

US Classification:

264184

Abstract:

Improved polybenzoxazole fibers are made by a process for finishing a spun and drawn dope fiber, which contains polybenzoxazole polymer and a solvent acid, including the steps of: (a) coagulating the dope fiber in an aqueous coagulant: (b) washing the coagulated fiber with an aqueous washing fluid for less than 72 hours under conditions such that the fiber contains no more than 8,000 ppm residual solvent acid (1 ppm=1 part per million, by weight); (c) drying the fiber at a temperature of no more than 300. degree. C. until it retains no more than about 2 weight percent residual moisture; and (d) heat-treating the fiber at a temperature of at least about 300. degree. C. under tension.

US Patent:

52884457, Feb 22, 1994

Filed:

Dec 3, 1992

Appl. No.:

7/985068

Inventors:

Katsuya Tani - Shiga, JP
Steven Rosenberg - Midland MI
Willard E. Alexander - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

D01D 1002
D01F 626

US Classification:

264 85

Abstract:

This invention aims at improvement of heat-treatment technology for manufacture of large amounts of polybenzazole fibers. The fibers are heat treated in a device that provides for a rapid, cocurrent, countercurrent or both cocurrent and countercurrent flow of heat treatment gas.

US Patent:

54116945, May 2, 1995

Filed:

Nov 18, 1993

Appl. No.:

8/154237

Inventors:

Willard E. Alexander - Midland MI
Timothy L. Faley - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

D01D 1002
D01D 1006

US Classification:

264184

Abstract:

Improved polybenzoxazole fibers are made by a process for finishing a spun and drawn dope fiber, which contains polybenzoxazole polymer and polyphosphoric acid, including the steps of: (a) coagulating the dope fiber in an aqueous coagulant; (b) washing the coagulated fiber with an aqueous washing fluid for less than 72 hours under conditions such that the fiber contains no more than 8,000 ppm residual phosphorus (1 ppm=1 part per million, by weight); (c) drying the fiber at a temperature of no more than 300. degree. C. until it retains no more than about 3 weight percent residual moisture; and (d) heat-treating the fiber at a temperature of at least about 300. degree. C. under tension.

US Patent:

47139277, Dec 22, 1987

Filed:

May 15, 1986

Appl. No.:

6/863625

Inventors:

Louis C. Rubens - Midland MI
Willard E. Alexander - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B29D 2704

US Classification:

53472

Abstract:

Pneumatic synthetic resinous foams are used as dunnage. Foams are added to a package under fluid pressure; the package closed, the pressure reduced to atmospheric, and particulate pneumatic foam expands to fill container.

US Patent:

41089340, Aug 22, 1978

Filed:

Mar 23, 1976

Appl. No.:

5/669551

Inventors:

Louis C. Rubens - Midland MI
Willard E. Alexander - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B29D 2700

US Classification:

264 53

Abstract:

Shaped articles of organic polymer resins having cellular (foamed) structure are made from heat-expandable normally solid thermoplastic resin compositions in permeable molds particularly characterized by flooding the mold cavity and the expandable material therein with molten salt as heating medium. For example, a permeable mold, charged with pieces of polyethylene containing azobisformamide and crosslinked by electron irradiation, is immersed into a molten salt eutectic mixture of KNO. sub. 3, NaNO. sub. 2 and NaNO. sub. 3 at about 264. degree. C, removed, cooled and washed with water, thereby forming a coherent, unitary cellular resin molded article completely filling the mold cavity.

US Patent:

59764473, Nov 2, 1999

Filed:

Jun 24, 1996

Appl. No.:

8/668784

Inventors:

Michael E. Mills - Midland MI
Willard Alexander - Midland MI
Timothy L. Faley - Midland MI

Assignee:

Toyobo Co., Ltd. - Osaka

International Classification:

D01F 626

US Classification:

264344

Abstract:

A continuous process for heating a polybenzazole or polybenzothiazole filament, which includes the step of heating the filament to a temperature of at least 100. degree. C. but no greater than 290. degree. C. while applying a tension thereto of at least 3. 5 grams per denier, which is carried out at a line speed of at least 100 m/minute; and there is no prior or subsequent heating of the fiber to any temperature greater than 300. degree. C. It has been discovered that placing tension on the filament while it is dried increases its tensile modulus without a significant decrease in its tensile strength.

US Patent:

44851936, Nov 27, 1984

Filed:

Apr 16, 1984

Appl. No.:

6/600751

Inventors:

Louis C. Rubens - Midland MI
Willard E. Alexander - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08J 922
C08J 924

US Classification:

521 58

Abstract:

Resilient foam particles and moldings are obtained employing a lightly crosslinked polymer such as a styrene polymer with volatile fluid foaming agent that has low permeability through the polymer. Multiple expansion will permit low density particles for molding.

US Patent:

46938567, Sep 15, 1987

Filed:

Apr 22, 1985

Appl. No.:

6/725952

Inventors:

Louis C. Rubens - Midland MI
Willard E. Alexander - Midland MI
Carl A. Raeck - Essexville MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08J 922

US Classification:

264 454

Abstract:

Expandible synthetic resinous particles are molded by injecting heated air generally centrally into the mold cavity by means of a probe, withdrawing the probe and heating the surface of the mold. Low densities and rapid cycle times are obtained.