Process for preparing polyamide based, titanium dioxide pigmented pulverulent coating compositions having at least ten aliphatically bound carbon atoms per carbonamide group

US4689364A · kind A · utility

Assignee

• Huls Aktiengesellschaft · DE

Inventors

• Salih Mumcu · Marl, DE
• Hans P. Aurich · Haltern, DE
• Helmut Winzer · Kevelaer, DE

Key dates

• Filing date: Mar 18, 1986
• Grant date: Aug 25, 1987
• Expiry date: Mar 18, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K3/22
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An improved process for preparing pulverulent coating compositions pigmented with titanium dioxide and based on polyamides having at least ten aliphatically bound carbon atoms per carbonamide group using the precipitation method. The titanium dioxide pigments used are without nucleating effects or only have weak nucleating effects on the polyamide precipitation. The pigments have nucleating effects less than or equal to 3.degree. C. where .DELTA.T=(T.sub.max p)-(T.sub.o). T.sub.max p is the maximum temperature at which precipitation takes place in a solution of polyamide having pigment therein and T.sub.o is the maximum temperature at which precipitation takes place in polyamide solution having no pigment therein.