Two-component polyurethane compositions containing OH-functional polydimethylsiloxanes
AssigneeBayer MaterialScience AG
InventorsMeike Niesten, Jörg Tillack
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Abstract
The present invention relates to two-component compositions containing A) hydroxyl-containing polydimethylsiloxanes having number average molecular weights of 400 to 3000 and an average OH functionality of ≧1.8, and containing at least one structural unit of formula I) wherein R is an aliphatic, linear or branched C1 to C20 radical, R1 is a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms and R2 is either hydrogen or a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms, B) polyhydroxyl compounds other than A) or polyamines, and C) polyisocyanates. The present invention also relates to coatings, adhesives or sealants obtained from these compositions.
Claims15
A two-component composition consisting of
- A) a hydroxyl-containing polydimethylsiloxane having a number average molecular weight of 400 to 3000 and an average OH functionality of ≧1.8, and containing at least one structural unit of formula (I)
- wherein R is an aliphatic, linear or branched C1 to C20 radical, R1 is a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms and R2 is either hydrogen or a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms,
- B) a polyhydroxyl compound other than A) or a polyamine, and
- C) a polyisocyanate.
A two-component composition consisting of
- A) a hydroxyl-containing polydimethylsiloxane having a number average molecular weight of 400 to 3000 and an average OH functionality of ≧1.8, and containing at least one structural unit of formula (I)
- wherein R is an aliphatic, linear or branched C1 to C20 radical, R1 is a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms and R2 is either hydrogen or a linear or branched hydroxyalkyl radical having 2 to 10 carbon atoms,
- B) a polyhydroxyl compound other than A) or a polyamine,
- C) a polyisocyanate, and
- D) one or more surface-active substances, internal release agents, fillers, dyes, pigments, flame retardants, hydrolysis inhibitors, microbiocides, flow control assistants, solvents and/or antioxidants.
Dependencies are inferred from the claim text.