Charles F Ferraro

US Patent:

40753697, Feb 21, 1978

Filed:

Apr 30, 1976

Appl. No.:

5/681826

Inventors:

Charles F. Ferraro - Trenton NJ
Richard A. Javick - Princeton Junction NJ
James A. Robertson - Levittown PA

Assignee:

FMC Corporation - Philadelphia PA

International Classification:

B05D 124
B05D 302

US Classification:

427185

Abstract:

Finely-divided, water dispersible, low molecular weight, linear polyamide resin particles having a unique morphology and of uniform particle sizes are formed by preparing a linear polyamide of a predetermined low molecular weight in the presence of water followed by rapidly quenching the reaction mass with an aqueous medium below the freezing point of the polyamide and continuing the cooling of the mass to a temperature sufficiently low so as to prevent particle growth and structural alteration while regulating the pH of the quenched mass to provide particles of predetermined, uniform size dispersed in the aqueous medium. The particles vary from ultimate flaky sheets or lamellae to loosely packed, randomly oriented, clusters of flaky sheets. Spray dried products may be agglomerates which disintegrate readily in water to the original particles or aggregates depending upon intended uses. The dispersions and dried products are useful in the coating art and the polyamide may be polymerized to high molecular weights after application to a substrate.

US Patent:

40691845, Jan 17, 1978

Filed:

Apr 30, 1976

Appl. No.:

5/681852

Inventors:

Charles F. Ferraro - Trenton NJ
Richard A. Javick - Princeton Junction NJ
James A. Robertson - Levittown PA

Assignee:

FMC Corporation - Philadelphia PA

International Classification:

C08J 300

US Classification:

260 292N

Abstract:

Finely-divided, water dispersible, low molecular weight, linear polyamide resin particles having a unique morphology and of uniform particle sizes are formed by preparing a linear polyamide of a predetermined low molecular weight in the presence of water followed by rapidly quenching the reaction mass with an aqueous medium below the freezing point of the polyamide and continuing the cooling of the mass to a temperature sufficiently low so as to prevent particle growth and structural alteration while regulating the pH of the quenched mass to provide particles of predetermined, uniform size dispersed in the aqueous medium. The particles vary from ultimate flaky sheets or lamellae to loosely packed, randomly oriented, clusters of flaky sheets. Spray dried products may be agglomerates which disintegrate readily in water to the original particles or aggregates depending upon intended uses. The dispersions and dried products are useful in the coating art and the polyamide may be polymerized to high molecular weights after application to a substrate.