Richard A Prather

US Patent:

43760880, Mar 8, 1983

Filed:

Mar 18, 1981

Appl. No.:

6/245167

Inventors:

Richard A. Prather - Houston TX

Assignee:

The Upjohn Company - Kalamazoo MI

International Classification:

B29J 502

US Classification:

264109

Abstract:

The use of polyisocyanates as binders in the preparation of particle boards is subject to the drawback that the boards exhibit a tendency to adhere to the face of the platens used in their formation. This problem is minimized by incorporating minor amounts of a mixture of certain organic sulfonic acids, hydrogen sulfates, salts and derivatives thereof, into the polyisocyanate to be used as binder. The polyisocyanates and the sulfonic acids, hydrogen sulfates, salts and derivatives are applied to the particles separately, or after preblending one with the other. Whether the components are applied separately or in combination one with the other, they can each be applied either neat of in the form of an emulsion or emulsions.

US Patent:

42581699, Mar 24, 1981

Filed:

Mar 26, 1980

Appl. No.:

6/134219

Inventors:

Richard A. Prather - Houston TX
David L. Williams - Houston TX
Robert M. Partin - Friendswood TX
Warren J. Rabourn - Deer Park TX

Assignee:

The Upjohn Company - Kalamazoo MI

International Classification:

C08G 1828

US Classification:

528 72

Abstract:

A process is disclosed for the preparation of liquid, storage-stable, polyisocyanate compositions containing a release agent formed in situ which compositions are useful, for example, as binder resins in the formation of particle boards which latter, because of the presence of the release agent, show no tendency to adhere to the face of metal platens used in their formation. The process comprises heating an organic polyisocyanate (polymethylene polyphenyl polyisocyanate preferred) with an acid phosphate (e. g. a mixture of mono- and di-alkyl acid phosphates) under conditions controlled as to time and temperature so as to yield a product which is storage stable and shows no tendency to deposit solid or to separate into two liquid phases.

US Patent:

43526969, Oct 5, 1982

Filed:

Mar 30, 1981

Appl. No.:

6/248804

Inventors:

Richard A. Prather - Houston TX

Assignee:

The Upjohn Company - Kalamazoo MI

International Classification:

C08L 100

US Classification:

106163R

Abstract:

The use of polyisocyanates as binders in the preparation of particle boards is subject to the drawback that the boards exhibit a tendency to adhere to the face of the platens used in their formation. This problem is minimized by incorporating minor amounts of certain phosphinic and or phosphonic acids or derivatives thereof or phosphites into the polyisocyanate to be used as binder. The polyisocyanates and the phosphorus compounds are applied to the particles separately, or after preblending one with the other. Whether the components are applied separately or in combination one with the other, they can each be applied either neat or in the form of an emulsion or emulsions.

US Patent:

44288972, Jan 31, 1984

Filed:

Dec 23, 1982

Appl. No.:

6/452777

Inventors:

Steven B. Lowenkron - Houston TX
Richard A. Prather - Houston TX
Howard R. Steele - Baytown TX

Assignee:

The Upjohn Company - Kalamazoo MI

International Classification:

B28B 704

US Classification:

264109

Abstract:

Particle boards are currently prepared by treating the particles (e. g. wood chips) with a binder comprising an organic polyisocyanate and, optionally, a release agent and then subjecting the treated particles to a molding process involving heat and pressure. The resulting particle board will generally release well from the caul plates of the press after forming. However, it has been found that the ease of release is enhanced, particularly where the wood particles in the board are derived from hardwood, by utilizing a metal selected from magnesium and zinc in the metallic surfaces of the caul plates or platens which come into contact with the particle board during the application of heat and pressure.

US Patent:

42949874, Oct 13, 1981

Filed:

Dec 31, 1979

Appl. No.:

6/108522

Inventors:

Richard A. Prather - Houston TX
Nirad N. Shah - Houston TX

Assignee:

The Upjohn Company - Kalamazoo MI

International Classification:

C07C 85145

US Classification:

564331

Abstract:

An improvement is described in the process of preparing polymethylene polyphenyl polyamines by condensing aniline and formaldehyde in the presence of an acid catalyst in the initial condensation. The improvement enables the amount of acid which has to be neutralized at the end of the reaction to be substantially reduced or eliminated entirely. This is accomplished without sacrifice of the high level of 4,4'-isomer of di(aminophenyl)methane normally present in the diamine content of the polyamines when a mineral acid catalyst is employed in the condensation. The improvement comprises conducting the initial condensation of aniline and formaldehyde in the presence of a strong acid at a level normally employed to obtain high 4,4'-isomer content in the diamine component of the polyamine product, subjecting the reaction mixture, at the stage at which benzylamine formation is substantially complete, to solvent extraction after adjusting the aniline and water content of the reaction mixture to specified levels, recovering the mixture of benzylamine and excess aniline from the solvent extract and subjecting this mixture (optionally after removal of aniline) to rearrangement to the desired polyamine product in the presence of a catalyst which can be a strong acid (at a level substantially below that used in the initial condensation), or a solid catalyst (diatomaceous earth, clay, zeolite). The aqueous layer remaining after the solvent extraction contains aniline hydrochloride and a minor amount of benzylamine hydrochloride and is recovered and used as part of the reactants employed in a subsequent condensation.

US Patent:

RE317039, Oct 9, 1984

Filed:

Aug 2, 1982

Appl. No.:

6/404415

Inventors:

Richard A. Prather - Houston TX
David L. Williams - Houston TX
Robert M. Partin - Friendswood TX
Warren J. Rabourn - late of Deer Park TX

Assignee:

The Upjohn Company - Kalamazoo MI

International Classification:

B29J 500
C08G 1838
C08G 1877

US Classification:

264109

Abstract:

A process is disclosed for the preparation of liquid, storage-stable, polyisocyanate compositions containing a release agent formed in situ which compositions are useful, for example, as binder resins in the formation of particle boards which latter, because of the presence of the release agent, show no tendency to adhere to the face of metal platens used in their formation. The process comprises heating an organic polyisocyanate (polymethylene polyphenyl polyisocyanate preferred) with an acid phosphate (e. g. a mixture of mono- and di-alkyl acid phosphates) under conditions controlled as to time and temperature so as to yield a product which is storage stable and shows no tendency to deposit solid or to separate into two liquid phases.