| 摘要 |
Moisture curable silicone adhesives used for sealing joints and for the bonding of substrates such as PVC, concrete, mineral substrates, metals, glass, ceramic, wood, or painted surfaces are prepared from crosslinkable compositions containing both hydrophilic and hydrophobic fumed silicas in a mass ratio of 1:10 to 10:1. |
| 主权项 |
1. A composition comprising:
(A) 100 parts by weight of at least one silane-crosslinking polymer of the formula
Y—[(CR12)b—SiRa(OR2)3-a]x (I), where Y is an x-valent, nitrogen-, oxygen-, sulfur-, or carbon-bonded polymer radical containing at least one polyether unit or at least one polyester unit, R each individually is a monovalent, optionally substituted hydrocarbyl radical, R1 each individually is hydrogen or a monovalent, optionally substituted hydrocarbyl radical, optionally bonded to carbon via nitrogen, phosphorus, oxygen, sulfur, or a carbonyl group, R2 each individually is hydrogen or a monovalent, optionally substituted hydrocarbyl radical, x is an integer from 1 to 10, a each individually is 0, 1, or 2 and, b each individually is an integer from 1 to 10, and (B) 5 to 100 parts by weight of fumed silica comprising (B1) hydrophilic fumed silica and (B2) hydrophobic fumed silica, with the proviso that (B1) and (B2) are used in a mass ratio of 10:1 to 1:10. |
