Latent curing agent and curable polyurethane composition
AssigneeSika Technology AG
InventorsUrs Burckhardt, Andreas Kramer
Life of this patent
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Abstract
A compound of formula (I) having advantageous properties when used as a latent curing agent for compositions containing isocyanate groups, and to compositions containing the compound of formula (I). The compound of formula (I) is odourless, is liquid and has comparatively low viscosity at room temperature and is stable in storage together with isocyanates. It makes possible odourless single-component polyurethane compositions which have good stability in storage, do not produce bubbles when cured in the presence of moisture, and cause no problematic odour emissions, giving a cured elastic material having good mechanical properties, good heat stability, a surprisingly non-adhesive surface and little tendency towards plasticizer migration.
Claims6
A composition comprising
- at least one compound of formula (I) and
- at least one polyisocyanate and/or at least one polyurethane polymer containing isocyanate groups;
- wherein
- the least one compound of the formula (I) is
- where
- n is 1, 2 or 3,
- Z is an aryl radical substituted by an alkyl or alkoxy group and having a total of 12 to 26 carbon atoms,
- A is an n-valent organic radical having a molecular weight in the range from 15 to 10,000 g/mol,
- X is O or S or NR0 where R0 is a monovalent organic radical having 1 to 18 carbon atoms, and
- Y is a 1,2-ethylene or 1,3-propylene radical which is optionally substituted, where A and Y in the case that n =1 may also be bonded to a trivalent radical having 4 to 10 carbon atoms.
Dependencies are inferred from the claim text.