Silylated polyurethane/polyorganosiloxane blend and sealant composition and fumed silica composition containing same

摘要

There is provided herein a composition comprising: (A) a silanol and/orhydrocarbon-terminated polyorganosiloxane in an amount of from about 30 weight percent to about 90 weight percent; and, (B) a moisture curable silylated polyurethane resin in an amount of from about 10 weight percent to about 70 weight percent. There is also provided herein in another embodiment a two part sealant composition wherein the first part comprises: (A) a silanol and/or hydrocarbon-terminated polyorganosiloxane in an amount of from about 15 weight percent to about 60 weight percent, (B) a moisture curable silylated polyurethane resin in an amount of from about 2 weight percent to about 32 weight percent, and (C) a filler, said weight percents being based on the weight of the first part. In addition, there is provided herein a fumed silica composition comprising: (A) a silanol and/or hydrocarbon-terminated polyorganosiloxane in an amount of from about 20 weight percent to about 62 weight percent; (B) a moisture curable silylated polyurethane resin in an amount of from about 8 weight percent to about 38 weight percent; and, (C) a treated fumed silica in an amount of from about 5 to about 10 weight percent.

主权项

1. A composition comprising:
(A) a silanol or an alkoxy-terminated and end-capped polyorganosiloxane in an amount of from 4 weight percent to 40 weight percent, wherein radicals bonded to Si atoms of the polyorganosiloxane are selected from the group consisting of —O—, —OH and monovalent; and, (B) a moisture curable silylated polyurethane resin in an amount of from at least 60 weight percent to about 90 weight percent, wherein said composition is opaque, and wherein the moisture curable silylated polyurethane resin (B) is a continuous phase and the silanol or alkoxy terminated polyorganosiloxane (A) is a domain phase.