Extremely scratch-resistant, highly elastic coating agents based on alkoxysilanes

US7879407B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Andreas Poppeq · Sendenhorst, DE
• Guenter Klein · Munster, DE
• Michael Kutschera · Ludwigshafen am Rhein, DE

Key dates

• Filing date: Oct 8, 2005
• Grant date: Feb 1, 2011
• Expiry date: Aug 28, 2026

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D143/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to coating agents, containing (A) at least 50 wt. %, (in relation to the content of non-volatile substances in said coating agent), of at least one compound (A1) and/or (A1′) comprising at least two reactive groups of formula (I): —X—SiR″x(OR′)3-x, in which R′=hydrogen, alkyl or cycloalkyl, whereby the carbon chain can be interrupted by non-adjacent oxygen, sulphur or NRa groups, Ra=alkyl, cycloalkyl, aryl or aralkyl, X=a linear and/or branched alkene or cycloalkene group comprising between 2 and 20 carbon atoms, R″=alkyl, cycloalkyl, aryl or aralkyl, whereby the carbon chain can be interrupted by non-adjacent oxygen, sulphur or NRa groups, and x=0 to 2, (B) a catalyst for cross-linking the —Si(OR′)3-x units, and (C) an organic solvent or a mixture of organic solvents. According to the invention, during the curing of the coating agents, the reactive groups (I) are cross-linked in such a way, that the following characteristics are noted during the nanoindentation test on the cured coating: elastic recovery of volume >86.5%; plastic deformation <3.5%; brittle deformation <10.0%.