摘要:
An aqueous silicone emulsion which upon the evaporation of the water forms a surface modified elastomeric silicone material providing improved coverage and adhesion of paint and reduced staining and coefficients of friction, each relative to other silicone elastomers from aqueous emulsions. The silicone emulsion comprises (A) water; (B) a plurality of particles dispersed in the water comprising a crosslinked product of a diorganosiloxane polymer; (C) a surfactant; and (D) an amount of an oxygen curing compound or a salt thereof effective for the surface modification. If a surface active salt of an oxygen curing compound is used, it may not be required to add additional surfactant in order to form the silicone emulsion.
摘要:
This invention relates to a method of sealing openings in structural components of a building to reduce the amount of smoke which may pass through the opening in the event of a fire. The method comprises filling an opening in a structural component of a building with a support material; applying a coating of a silicone composition over the filled opening and allowing the silicone composition to cure into a continuous elastomeric film having certain properties. These silicone compositions exhibit pseudo plastic rheology which facilitates their application by spraying.
摘要:
The longevity of a surface driving oil layer on a room temperature vulcanizable silicone sealant is increased by adding zinc oxide to a non-acidic composition and exposing the composition to atmospheric moisture which forms the surface drying oil layer on an air exposed surface.
摘要:
The discoloration of a non-acidic room temperature vulcanizable silicone sealant containing a ultraviolet radiation degradable fungicide is delayed by adding zinc oxide.
摘要:
A crosslinked polysiloxane dispersion comprising a siloxane polymer, polymer mixture, or polymer/solvent mixture, capable of crosslinking via condensation, addition or free radical reactions, and having a viscosity of greater than 5000 mPa.s but less than 500,000 mPa.s, if required, 0.1 to 10 weight parts of a crosslinking agent, and, if required, depending on the nature of the catalyst and silicon cure system, 0.000001 to 10 weight parts of a catalyst, 0.5 to 10 weight parts of a surfactant or surfactant mixture, and 0.5 to 25 weight parts water per 100 weight parts siloxane polymer. Optionally, adhesion promoters, pigments, reinforcing or non-reinforcing fillers, silicone resins, stabilizers, freeze/thaw additives, etc. may also be added to the dispersion.
摘要:
A crosslinked polymer dispersion comprising a preformed polymer, selected from the group consisting of silicon modified organic polymers, mixtures of silicon modified organic polymers, mixtures of silicon modified organic polymer(s) with regular organic polymers, mixtures of silicon modified organic polymer(s) with siloxane polymers, mixtures of above polymers, and mixtures of above polymer(s) with organic plasticizers or solvents.
摘要:
This invention relates to an aqueous silicone emulsion which forms a silicone elastomer upon the removal of water having improved adhesions to substrates. The silicone emulsion comprises the product form by mixing a diorganosiloxane polymer, water, surfactant, optionally a crosslinker, a tin condensation catalyst, optionally an acid and an effective amount of an aminofunctional siloxane which is formed by reacting an aminofunctional silane and a hydroxy-endblocked organosiloxane.
摘要:
This invention relates to sprayable aqueous silicone emulsions which form silicone elastomers upon the removal of water having improved smoke and fire resistant properties. The aqueous silicone emulsion comprises water, a product of a diorganosiloxane polymer and a crosslinker, a surfactant and a filler selected from the group consisting of aluminum trihydrate, fumed titanium dioxide, magnesium oxide, ceramic fillers and zinc borate. The silicone emulsion has a viscosity of 10,000 to 120,000 mPa s and exhibits pseudo plastic rheology which facilitates its application by spraying. A softening agent may also be added for modulus control.
摘要:
A condensation curable silyl functional hydrocarbon polymer composition with improved adhesion to substrates. The composition comprises: (A) 100 parts by weight of an organic hydrocarbon polymer having a number average molecular weight of about 500 to about 300,000, and on average at least 1 hydrolyzable silyl group per molecule; (B) 0.1 to 100 parts by weight per 100 parts by weight of (A) of an alkoxy-silyl substituted organic adhesion promoter of an number average molecular weight in the range of 500 to 5,000, selected from the group consisting of di- or trialkoxy-silyl substituted polybutadiene, polyisoprene, polyisobutylene, copolymers of isobutylene and isoprene, copolymers of isoprene and butadiene, copolymers of isoprene and styrene, copolymers of butadiene and styrene and polyolefin polymers prepared by hydrogenating polyisoprene, polybutadiene or a copolymer of isoprene and styrene, a copolymer of butadiene and styrene or a copolymer of isoprene, butadiene and styrene, with the proviso that component (B) is different from component (A); and (C) 0.01 to 10 parts by weight per 100 parts by weight of (A) of a condensation cure catalyst; optional ingredients include (D) non reinforcing fillers and/or low-reinforcing fillers; (E) reinforcing filler and (F) water or a moisture-containing component. Applications include use as sealants for insulating glazing.
摘要:
A hydrosilylation curable composition containing a comprising (A) 100 parts by weight of an organic polymer haying on average at least 1.4 alkenyl groups per molecule; (B) an amount sufficient to cure the composition of a crosslinker having on average at least 1.4 Si—H groups per molecule; (C) a platinum group metal-containing catalyst in an amount sufficient to effect curing of the composition; (D) 0.1 to 20 parts by weight per 100 parts by weight of (A) of an alkoxy silyl substituted organic oligomer having a number average molecular weight in the range of 200 to 5,000, having a polymer backbone selected from the group of polybutadiene, polyisoprene, polyisobutylene, copolymers of isobutylene and isoprene, copolymers of isoprene and buta-diene, copolymers of isoprene and styrene, copolymers of butadiene and styrene, copolymers of isoprene, butadiene and styrene and polyolefin polymers prepared by hydrogenating polyisoprene, polybutadiene or a copolymer of isoprene and styrene, a copolymer of butadiene and styrene or a copolymer of isoprene, butadiene and styrene, and optionally a titanium compound having Ti—O—C bonds. The composition provides improved self adhesion to substrates.