Two-component polyurethane composition
AssigneeSika Technology AG
InventorSteffen KELCH
Life of this patent
Estimating the term…
Abstract
A two-component polyurethane composition which includes a polyol component and a polyisocyanate component, wherein the polyol component includes at least one reaction product of epoxidized vegetable oils with monofunctional C1-8-alcohols A1-1 and/or at least one reaction product of epoxidized fatty acid esters with monofunctional C1-8-alcohols with aliphatic alcohols A1-2, at least one polybutadiene polyol A2 and at least one alkoxulated alkylenediamine A3. The polyurethane composition of the invention has high strength and only a minor dependence of mechanical properties, especially of strength, on temperature, especially in the range from −50° C. to +120° C.
Claims15
A two-component polyurethane composition consisting of a polyol component K1 and a polyisocyanate component K2;
- wherein the polyol component K1 comprises
- at least one reaction product of epoxidized vegetable oils having a C18 fatty acid content of more than 50% by weight based on the total amount of fatty acids, with monofunctional C1-8 alcohols A1-1;
- and/or
- at least one reaction product of epoxidized fatty acid esters of monofunctional C1-8 alcohols with aliphatic alcohols having an OH functionality in the range from 2 to 5, where the parent fatty acid component of the epoxidized fatty acid esters is fatty acid mixtures having a content of C18 fatty acids of at least 50% by weight, based on the overall fatty acid mixture A1-2;
- and
- at least one polybutadiene polyol having an OH functionality in the range from 2.1 to 2.9, and having an average molecular weight in the range from 2000 to 4000 g/mol, and an OH number of 40-100 mg KOH/g A2;
- and
- at least one alkyoxylated alkylenediamine having an OH number of 350-950 mg KOH/g A3;
- and wherein the polyisocyanate component K2 comprises
- at least one aromatic polyisocyanate B1,
- and where the ratio of all NCO groups of the aromatic polyisocyanates B1:
- all OH groups of the polyol component K1=0.9:1-1.2:1.
Dependencies are inferred from the claim text.