Two-component polyurethane compositions, in particular suitable for use as viscoplastic structural adhesives
AssigneeSika Technology AG
InventorSteffen Kelch
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Abstract
The invention concerns a two-component polyurethane composition including a polyol component K1 and a polyisocyanate component K2, the polyol component K1 including castor oil A1 and 1,2,3-propane triol A2, and the polyisocyanate component K2 including at least one aromatic polyisocyanate B1, the ratio in weight percent of (A1/A2) being between 4 and 50 and the ratio of all NCO groups of the aromatic polyisocyanates B1 to all the OH groups totaling (A1+A2)=1.15:1-85:1, and the total of all the OH groups of (A1+A2) being >93% of the total of all the OH groups of the two-component polyurethane composition, characterized by controllable hydrolytic degradability.
Claims10
A two-component polyurethane adhesive composition consisting of a polyol component K1 and a polyisocyanate component K2;
- wherein:
- the polyol component K1 comprises castor oil A1 and 1,2,3-propanetriol A2,
- the polyisocyanate component K2 comprises at least one aromatic polyisocyanate B1,
- a ratio of the wt % of the castor oil A1 to the 1,2,3-propanetriol is 8-30,
- a ratio of a sum of all NCO groups of the aromatic polyisocyanate B1:a sum of all OH groups of the castor oil A1 and the 1,2,3-propanetriol A2=1.15:1-0.85:1,
- a sum of all OH groups of the castor oil A1 and the 1,2,3-propanetriol A2 is ≧99.5% of a sum of all OH groups of the two-component polyurethane adhesive composition, and
- wherein the two-component polyurethane adhesive composition is a hydrolytically degradable adhesive.
Dependencies are inferred from the claim text.