Abstract:
Cyclic aminoalkylsilane compositions are prepared by the reaction of approximately equimolar amounts of an aminoalkyltrialkoxysilane such as 3-aminopropyltrimethoxy-silane and a glycidyl ether such as methyl glycidyl ether. They are useful as adhesion promotors in room temperature vulcanizable compositions comprising polyalkoxysilyl-terminated polydiorganosiloxanes.
Abstract:
An article comprises a weatherable surface exposed to precipitation or airborne debris; and a weather resistant coating disposed on the weatherable surface, wherein the coating comprises component A, a one- or two-part room temperature vulcanizable polyorganosiloxane composition; and component B, an ice release-enhancing proportion of at least one polyorganosiloxane comprising one or more silanol or alkoxy-silyl groups and comprising from about 10 weight percent to about 85 weight percent of at least one hydroxy-terminated or alkoxy-terminated polyoxyalkylenealkyl radical; and any reaction products thereof. In another embodiment, an article comprises a weatherable surface exposed to precipitation or airborne debris; and a weather resistant coating disposed on the weatherable surface, wherein the coating includes a one- or two-part addition curable polyorganosiloxane composition comprising a resin polymer and a crosslinker, wherein the resin polymer and/or crosslinker comprises an ice release-enhancing proportion of covalently bound hydrophilic functionality that contributes from about 0.5 weight percent to about 40 weight percent of the coating composition; and any reaction products thereof.
Abstract:
A coating composition is provided comprising: (i) a fluorinated polymer comprising (a) structural units having the formula (I): —CR1R2—CFX— (I) wherein R1 and R2 are each independently an alkyl group, a fluorine atom, a chlorine atom, a hydrogen atom or a trifluoromethyl group, and X is a fluorine atom, a chlorine atom, a hydrogen atom or a trifluoromethyl group, and (b) structural units comprising at least one type of crosslinkable functional group; (ii) a crosslinking agent; and (iii) a plurality of particles functionalized with a functional group, wherein the functional group on the particles is essentially non-reactive with the fluorinated polymer and with the crosslinking agent. Articles comprising a coating composition described in embodiments of the invention are also provided.
Abstract:
An article comprising a surface portion is provided. The surface portion has a plurality of primary features, and the primary features have a height dimension in the range from about I micron to about 500 microns, an aspect ratio in the range from about 0.5 to about 10, and a spacing dimension in the range from about 0.5 to about 50 feature width units. The surface portion comprising the features has a wettability of the surface sufficient to generate, with a reference fluid, a static contact angle of greater than about 120 degrees and a total transmission of at least about 70% in the visible range of electromagnetic radiation.
Abstract:
A silicone composition is provided which comprises a room-temperature vulcanizable adhesive formulation which comprises bis(trialkoxysilylalkyl)hydromuconate.
Abstract:
Room temperature vulcanizable coating compositions, useful as anti-fouling coatings for marine structures such as ships, are prepared by a method comprising the steps of first blending a particulate reinforcing filler such as silica with a non-reactive polyorganosiloxane oil under high shear conditions, and subsequently combining the resulting masterbatch with at least one reactive polyorganosiloxane having a relatively low viscosity, a condensation catalyst and a crosslinking agent. The resulting compositions are sprayable in the absence of solvents, although solvents may be added if desired.
Abstract:
Addition-curable platinum group metal catalyzed silicone compositions are provided which utilize an adhesion promoter in the form of a Michael reaction product of a bis(aminoalkyl)tetraalkyldisiloxane, such as bis(aminopropyl)tetramethyldisiloxane, with an acryloxyorganotrialkoxysilane, for example, acryloxypropyltrimethoxysilane. The addition-curable silicone compositions can bond to plastic and metal substrates at temperatures of less than 100.degree. C. and in less than 1 hour, forming composites which fail cohesively upon separation.
Abstract:
Bis(bis-silylalkyl) dicarboxylates, especially maleates and fumarates, are prepared by a three-step process including esterification of malaic or fumaric acid or a functional derivative thereof with a branched dienol such as 1,6-heptadien-4-ol to form an alkadienol ester, reaction of the olefinic groups in said ester with a chlorosilane and alcoholysis of the chlorine atoms attached to silicon. The products are useful as adhesion promoters in addition curable polyorganosiloxane compositions.
Abstract:
Room temperature vulcanizable platinum group metal catalyzed silicone compositions are provided which utilize an N-heterocyclic adhesion promoter, such as 2,6 bis(trimethoxysilyltrimethyleneoxy)pyridine. Cohesive bonding is effected on various substrates.
Abstract:
Silicone foams are prepared by microwave curing of a mixture of at least one polyorganosiloxane having vinyl groups attached to silicon; at least one hydride polysiloxane; a blowing agent comprising water and, preferably, at least one monohydroxyaliphatic compound, a cyclodextrin inclusion compound of a platinum group metal coordination complex (preferably with a cyclic diene) and a filler. The use of the inclusion compound as a catalyst increases the shelf life of the composition, whereupon curing and foaming occur together upon exposure to microwave radiation.