Polyurethane composition having long processing time and high strength
AssigneeSika Technology AG
InventorsHans Häberle, Urs Burckhardt
Life of this patent
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Abstract
A composition including a first component containing at least one polyol and at least one compound having at least one reactive group of the formula (I), and a second component containing at least one aromatic polyisocyanate and/or at least one polymer containing aromatic isocyanate groups. The composition has a long open time and, even in the case of small amounts of compound having at least one reactive group of the formula (I), enables elastic coatings having improved mechanical properties without causing problems with odor emissions or migration effects. It is thus particularly suitable as a coating for floors or roof areas.
Claims11
A composition comprising:
- a first component containing:
- at least one polyol, and
- at least one of the formula (II a)
- where:
- R1 is an alkyl radical having 1 to 8 carbon atoms or a phenyl radical,
- s is 2 or 3,
- A1 is a di- or trivalent organic radical having 6 to 100 carbon atoms and at least 2 ether groups,
- X is:
- an alkyl or alkoxy radical having 1 to 8 carbon atoms, or
- a radical of the formula —NR2R3 where R2 and R3 are each independently H or an alkyl, cycloalkyl, aralkyl or aryl radical optionally having ether oxygen and having 1 to 12 carbon atoms, or together are an alkylene radical optionally having ether oxygen and having 3 to 6 carbon atoms, and
- the compound has an average molecular weight Mn of not more than 2,500 g/mol, and
- a second component containing at least one aromatic polyisocyanate and/or at least one polymer containing aromatic isocyanate groups.
Dependencies are inferred from the claim text.