Colored concrete roofing tiles and a method for producing colored concrete bodies such as colored concrete roofing tiles

US6268410A · kind A · utility

Assignee

• Laferge Braas GmbH · DE

Inventors

• Andreas Drechsler · Baar, CH
• Daniel Neupert · Alzenau, DE
• Silke Werner · Heusenstamm, DE

Key dates

• Filing date: Feb 14, 2000
• Grant date: Jul 31, 2001
• Expiry date: Feb 14, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/00594
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for producing colored concrete bodies, particularly colored concrete roof tiles, whereby pigment is added to the unprocessed concrete mix. In order to provide the production of permanently colored concrete bodies with reasonably priced pigments which are stable in outdoor exposure and are resistant to light, particularly UV, alkaiis and heat. A cement compatible aqueous polymer dispersion in which organic pigment is dispersed is added to the unprocessed concrete mix. Suitable cement compatible polymer dispersions are aqueous polymer dispersions based on styrene and/or pure acrylate. Phthalocyanine and quinacridone pigments are particularly suitable as organic pigments.