Peter E Pierini

50719173, Dec 10, 1991

Aug 20, 1990

7/569492

David R. Pederson - Clayton CA
Peter E. Pierini - Berkeley CA
Henry N. Beck - Walnut Creek CA
Mark J. Semer - Fairfield CA

The Dow Chemical Company - Midland MI

D01F 656

525241

The invention is a crystalline fiber comprising syndiotactic polystyrene, or a mixture. Preferably the fiber is a high strength fiber isotactic polystyrene and syndiotactic polystyrene wherein the fiber is monoaxially oriented, has a tensile strength of about 10,000 psi or greater, and a modulus of about 1,000,000 psi or greater. In another aspect the invention is a process for the preparation of fibers of syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene which comprises: A. contacting syndiotactic polystyrene, or a mixture of isotactic polystyrene and syndiotactic polystyrene with a solvent for the polystyrene at elevated temperatures under conditions such that a homogenous solution is formed which has sufficient viscosity to be extruded; B. extruding the solution through an orifice to form a fiber at elevated temperatures; C. quenching the fiber by passing the fiber through one or more zones under conditions such that the fiber solidifies; D.

54608600, Oct 24, 1995

May 20, 1994

8/246595

Robert E. Hefner - Lake Jackson TX
Jimmy D. Earls - Lake Jackson TX
Peter E. Pierini - Midland MI
David A. Waldman - Acton MA
Lalitha Reddy - Walnut Creek CA

The Dow Chemical Company - Midland MI

C08G 5906
C08G 5922
C08G 5928
C08L 6302

428 1

Mesogen containing biaxially oriented films are prepared from curable mixtures containing an epoxy resin and a curing agent therefor. Certain of the mesogen containing biaxially oriented films possess unique properties, such as a metallic like, highly reflective appearance. These films are useful in adhesives, coatings, laminates or composites and the like.

51962594, Mar 23, 1993

Dec 7, 1990

7/624164

Peter E. Pierini - Berkeley CA
Ritchie A. Wessling - Berkeley CA
Peter K. Kim - Danville CA

The Dow Chemical Company - Midland MI

B32B 2702
C08G 1860

428245

Fibers may be prepregged with a dope containing polybenzoxazole or polybenzothiazole. The prepreg may be contacted with water or another nonsolvent to coagulate the polymer and form a matrix composite.

57888884, Aug 4, 1998

Oct 28, 1994

8/330898

Arie Cohen - Midland MI
Myrna Serrano - Midland MI
Norman L. Madison - late of Midland MI
Peter E. Pierini - Midland MI
Ritchie A. Wessling - Midland MI
Donald E. McLemore - Midland MI
Donald L. Schmidt - Midland MI

The Dow Chemical Company - Midland MI

B29C 5512

264 28

Described is a process for preparing a three-dimensional article of a lyotropic polymer comprising the steps of (a) forming a shaped article of a liquid crystalline solution of a lyotropic polymer; (b) washing the shaped article with a washing fluid under conditions sufficient to reduce the solvent content of the article to less than about 2,000 parts per million, wherein the dimensions of the washed article are no less than 0. 05 inches by 0. 05 inches by 0. 05 inches. Such articles are useful for many applications, particularly those requiring fire- and/or heat-resistance.

54457793, Aug 29, 1995

Jan 14, 1994

8/182818

Peter E. Pierini - Midland MI
Myung H. Cho - Daejeon, KR

The Dow Chemical Company - Midland MI

B29C 4700
B29C 5508
B29C 7102

2642105

A simplified and more efficient process is described for drying (and heat-treating) a lyotropic polybenzazole film in which the film is constrained in only the machine direction during drying (and heat-treating). The amount of stretching in the transverse direction the film undergoes prior to it being coagulated can be increased to compensate for the relaxation of the film during the drying process and the lack of stretching during the heat-treating process. Films made in this manner have acceptable finished properties.

48675318, Sep 19, 1989

Feb 29, 1988

7/161621

Theodore L. Parker - Walnut Creek CA
David R. Pedersen - Clayton CA
Peter E. Pierini - Berkeley CA

The Dow Chemical Company - Midland MI

G02B 600

350 9634

The present invention pertains to a flexible organic polymeric optical fiber core having an adherent flexible organic polymeric cladding on the outer surface. More particularly, the invention relates to an organic polymeric optical fiber having a polysiloxane cladding for long term in vivo use in the tissue of a living mammal, preferably a human being. In addition to compatibility in live tissue and body fluids, such a fiber must be capable of repeatedly being deformed in a small bend radius without losing the ability to transmit light. The clad optical fibers are used to measure levels of components (e. g. , pH, oxygen, carbon dioxide) in living, moving tissue such as the heart or lungs.

53023340, Apr 12, 1994

May 21, 1992

7/887443

Peter E. Pierini - Berkeley CA
Reid H. Bowman - Walnut Creek CA
Willie E. Rochefort - Hercules CA

The Dow Chemical Company - Midland MI

B29C 5512

264233

A process for coagulating a polybenzazole film which includes contacting a lyotropic polybenzazole dope film that is constrained in at least two directions with a coagulant under conditions such that the polybenzazole polymer separates as a gelled moiety with the structure set such that further removal of solvent will result in no more than a 5% increase in the force necessary to constrain the film.

52924700, Mar 8, 1994

Jan 5, 1993

8/000848

Lalitha Reddy - Walnut Creek CA
Willie E. Rochefort - Hercules CA
Peter E. Pierini - Berkeley CA

The Dow Chemical Company - Midland MI

B29C 7102

264169

Films made from polybenzazole dopes can quickly be leached to remove polyphosphoric acid and other residual solvents by passing a leaching fluid such as steam through pores in the wet, never dried film. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.