Guanidine catalyst for curable compositions
AssigneeSika Technology AG
InventorsRita CANNAS, Urs BURCKHARDT
Life of this patent
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Abstract
A guanidine of the formula (I) and to the use thereof as catalyst for the crosslinking of a functional compound, especially a polymer having silane groups. The guanidine of the formula (I) described is preparable in a simple method via a polyfunctional carbodiimide adduct from the readily available raw materials, and is largely odorless at room temperature and of low toxicity. In spite of its comparatively high molecular weight, it accelerates the crosslinking of functional compounds surprisingly well, and such compositions do not have a tendency to migration-related defects such as separation, exudation or substrate soiling.
Claims15
A guanidine of the formula (I)
- where
- n is an integer from 1 to 20,
- A is an alkyl, cycloalkyl or aralkyl radical which has 1 to 100 carbon atoms and optionally has one or more heteroatoms, or together with R1 is an alkylene radical which has 2 to 6 carbon atoms and optionally contains ether oxygen or amine nitrogen and is optionally substituted,
- R1 is a hydrogen radical or is an alkyl radical which has 1 to 8 carbon atoms and optionally contains ether oxygen, or together with A is an alkylene radical which has 2 to 6 carbon atoms and optionally contains ether oxygen or amine nitrogen and is optionally substituted,
- D is a divalent aliphatic or cycloaliphatic or arylaliphatic radical having 6 to carbon atoms,
- B is a monovalent organic radical which has an average molecular weight in the range from 150 to 5,000 g/mol and is free of hydroxyl groups, primary and secondary amino groups and mercapto groups, and
- X is O or S or NR2 where R2 is a hydrogen radical or is an alkyl radical which has 1 to 8 carbon atoms and optionally contains ether oxygen or tertiary amine nitrogen.
Dependencies are inferred from the claim text.