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US 8,785,511 B2Granted
Silicone-containing polyurethane foam
AssigneeWacker Chemie AG
InventorsJens Cremer, Steffen Jungermann
Life of this patent
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Abstract
Low density silicone-containing polyurethane foams with excellent surface characteristics are prepared by reacting a foamable composition containing a siloxane of the formula and an isocyanate, in the presence of at least one blowing agent.
Claims11
A foamable composition, comprising
- (A) at least one siloxane of the formula
- where
- R in each occurrence is the same or different and is hydrogen or a monovalent, optionally substituted hydrocarbon radical,
- R1 in each occurrence is the same or different and is a divalent, optionally substituted hydrocarbon radical optionally interrupted by heteroatoms,
- R2 in each occurrence is the same or different and is a divalent, optionally substituted hydrocarbon radical optionally interrupted by heteroatoms,
- R3 in each occurrence is the same or different and is hydrogen or a monovalent, optionally substituted hydrocarbon radical,
- X in each occurrence is the same or different and is —O—, —S— or —NR4—,
- R4 is hydrogen or a monovalent, optionally substituted hydrocarbon radical,
- n is the same or different and is an integer not less than 1, and
- m is an integer not less than 1,
- with the proviso that at least one R3 radical in formula (I) is an optionally substituted hydrocarbon radical having at least one hydroxyl group and/or thiol group, and
- (B) a polyisocyanate.
9 more elements
Dependencies are inferred from the claim text.