Aqueous dispersions of polyamides

US5804682A · kind A · utility

Assignee

• Henkel Limited

Inventors

• Stephen A. Fischer · Yardley, US
• David Devore · Langhorne, US
• Kartar S. Arora · Doylestown, US
• Reimar Heucher · Pulheim, DE
• Michael S. Wiggins · Lansdale, US
• Chase J. Boudreaux · Canton, US
• Dwight Heinrich · Aurora, US

Key dates

• Filing date: Oct 25, 1996
• Grant date: Sep 8, 1998
• Expiry date: Oct 25, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2377/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process is provided for preparing a dispersion of a polyamide in water, said process comprising: PA1 forming a solution of a polyamide having an acid value of greater than about 2 in an organic solvent to form a solution of said polyamide in said solvent, said polyamide and said solvent being at a temperature below the softening point of said polyamide during said dissolving, said solution further comprising a surfactant, wherein at least a portion of the acid value of said polyamide is neutralized, PA1 adding sufficient water to said solution with mixing to form an oil-in-water dispersion, the temperature of said solution and said water being below the softening point of said polyamide during said adding, and PA1 removing at least a major amount of said organic solvent from said oil-in-water dispersion. The resulting dispersion is useful in preparing a coating of the polyamide, which coating is useful as an adhesive.