Dow Corning Corporation

Massachusetts Institute of Technology

Massachusetts Inst. Tech.

Other

Dow Coming Corporation

John Robert Keryk

Bizhong Zhu

Dimitris Katsoulis

Frederick J McGarry

Dimitris Elias Katsoulis

Zhongtao Li

Herschel Henry Reese

Yuhong Wu

Randall Gene Schmidt

William James Schulz, Jr

Peter Y Lo

Antony P Wright

Harold L Vincent

Padmakumari J Varaprath

Kermit S Kwan

Katherine L Ulman

Debora F Bergstrom

Katsuya Eguchi

LeRoy E Thayer

Peter Y Kwai Lo

Ramnath Subramanian

A fiber reinforced composite including layers of fibers, each layer being impregnated with a resin. The layers include in combination a layer of an addition cured silicone resin and a layer of an organic resin. The layers form a hybrid composite having a higher modulus retention at elevated temperatures than the addition cured silicone resin alone. The hybrid composite's mechanical properties are similar to the organic resin composite, but demonstrate enhanced thermal resistance and reduced flammability.

Hybrid composite of silicone and organic resins

An organopolysiloxane copolymer, comprising (i) R SiO units, (ii) random R SiO units, and (iii) linear (R SiO) units, wherein R is independently hydrocarbyl or halogen-substituted hydrocarbyl, R and R are independently R or H, n has an average value of from 5 to 500, the mole ratio of R SiO units to R SiO units is from 1 to 30, and the mole ratio of R SiO units and R SiO units combined to (R SiO) units is from 3 to 600 when the copolymer contains aliphatic unsaturation or from 1 to 600 when the copolymer is free of aliphatic unsaturation; and a method of preparing the organopolysiloxane copolymer.

Organopolysiloxane copolymer and method of preparing

A hydrosilylation reaction curable composition that includes a silsesquioxane polymer, a mixture of silanes or siloxanes as a cross-linking compound and a hydrosilylation reaction catalyst. The curable composition is cured to form a cured resin having high fracture toughness and strength without the loss of elastic modulus.

High fracture toughness hydrosilyation cured silicone resin

A hydrosilylation reaction curable composition including a silsesquioxane polymer, a cross-linking compound, a hydrosilylation reaction catalyst and colloidal silica having a surface coating formed thereon. The curable composition is cured to form a cured resin having high fracture toughness and strength without the loss of elastic modulus and glass transition temperature.

Hydrosilyation cured silicone resin containing colloidal silica and a process for producing the same

A process for producing a cured silsesquioxane resin. The process includes fractionating the silsesquioxane resin a plurality of times utilizing an organic solvent in combination with an organic non-solvent. The fractionated resin is then stripped of excess solvent. The stripped resin is then mixed with a cross-linking compound to form a curable composition. The curable composition is cured to form a cured resin having high fracture toughness and strength without the loss of elastic modulus.

Hydrosilyation cured silicone resins obtained by fractionation

Novel rubber-modified rigid silicone resins are disclosed. The novel resins are the copolymerized reaction product of (A) an organosilicon composition selected from the group consisting (I) an organosilicone resin, (II) hydrolyzable precursors of (I), and an hydrolyzate of (II), (B1) a first silicone rubber having a nonfunctional linear chain length between functional groups from 6 to 100 and (B2) a second silicone ruberr having terminal functional groups and a degree of polymerization from about 200 to 1,000. The novel rubber-modified rigid silicone resins of the invention show remarkably high fracture toughness, K.sub.Ic, and critical strain energy release rate G.sub.Ic.

Rubber-modified rigid silicone resins and composites produced therefrom

Novel rubber-modified rigid silicone resins a novel method of making the same are disclosed. The resins are the copolymerized reaction product of (A) an organosilicon composition selected from the group consisting (I) an organosilicone resin, (II) hydrolyzable precursors of (I), and an hydrolyzate of (II) and (B) an silicone rubber. In the method of the invention, the copolymerization step is carried out in an organic solvent, preferably utilizing a relatively weak condensation catalyst. Thereafter, the solution is devolatilized and the composition cured by heating.

Method of making rubber-modified rigid silicone resins and composites

Novel rubber-modified rigid silicone resins are disclosed. The novel resins are the copolymerized reaction product of (A) an organosilicon composition selected from the group consisting (I) an organosilicone resin, (II) hydrolyzable precursors of (I), and an hydrolyzate of (II) and (B) an silicone rubber. The novel rubber-modified rigid silicone resins of the invention show remarkably high fracture toughness, K.sub.Ic, and critical strain energy release rate G.sub.Ic.

The invention relates to a method of forming siloxane polymers using a heteropoly catalyst having a Keggin structure. The method comprises contacting a fluid comprising at least one siloxane polymer precursor selected from the group consisting of cyclic siloxanes (I) having the formula (RR'SiO).sub.a and linear siloxanes (II) having the formula ##STR1## where R is a substituted or unsubstituted monovalent hydrocarbon having from 1 to 6 carbon atoms, R' is hydrogen or a substituted or unsubstituted monovalent hydrocarbon having from 1 to 6 carbon atoms, a is at least 3 and b is at least 1; with an effective amount of a heteropoly catalyst having a Keggin structure, selected from the group consisting of heteropoly acids (III) having the formula H.sub.n XM.sub.12 O.sub.40, salts thereof and mixed acid-salts thereof, where X is B.sup.+3, Si.sup.+4, Ge .sup.+4, p.sup.+5, M is Mo.sup.+6 and n is 3, 4 or 5, as required for the valence of the heteropoly acid to equal 0, at a temperature ranging from about 23.degree. C. to the boiling point of the siloxane polymer precursor.

Method of forming siloxane polymers using a heteropoly catalyst having a

Silane modified polyoxometalate anions represented by the formula YZ(SiRR').sub.n were prepared by reacting a silane having two hydrolyzable groups with a lacunary polyoxometalate anion. In the formula YZ(SiRR').sub.n, Z is M.sub.11 O.sub.39.sup.-12, M.sub.9 O.sub.34.sup.-14 or M.sub.17 O.sub.61.sup.-20, where M is tungsten or molybdenum; Y is As.sup.+5, Si.sup.+4, B.sup.+3, Ge.sup.+4, P.sup.+5 or Fe.sup.+5 when Z is M.sub.11 O.sub.39.sup.-12, Y is Si.sup.+4, Ge.sup.+4, or P.sup.+5 when Z is M.sub.9 O.sub.34.sup.-14 and Y is As.sub.2.sup.+10 or P.sub.2.sup.+10 when Z is M.sub.17 O.sub.61.sup.-20 ; R is selected from the group consisting of monovalent hydrocarbon radicals having from 1 to 24 carbon atoms, monovalent halogenated hydrocarbon or carbon radicals having from 1 to 24 carbon atoms and monovalent hydrocarbon radicals having from 1 to 24 carbon atoms substituted with an epoxy group, an amino group, a mercapto group or a methacrylo group; R' is a hydrogen atom or R and n represents the number of (.dbd.SiRR').sup.+2 groups bonding to the polyoxometalate anion and has a value from 1 to 3.

Silane modified polyoxometalate anions

This invention provides organosiloxane compounds containing silicon-bonded polyoxometalate (POM) structures that are present as pendant groups. The invention also provides methods for preparing these reaction products.

Organosiloxane compounds containing polyoxometalate groups

The instant invention pertains to a hot-melt pressure sensitive adhesive composition wherein the composition is comprised of a mixture of (i) a silicone resin and (ii) a silicone fluid, the mixture exhibiting tackiness and adhesiveness, the mixture being blended with (B) from about 1.0 to 20 weight percent, based on the total weight of the mixture of (i) and (ii), of a siloxylated allyloxypropane diol copolymer. The instant invention also encompasses method of using the composition, methods of making hot-melt silicone pressure sensitive adhesive-coated substrates, and devices made using the composition.

Hot-melt silicone pressure sensitive adhesive with siloxylated

Curable organosilicon compounds which contain (meth)acryl-amido-substituted hydrocarbon radicals have their viscosities greatly reduced by the addition of a small amount of a vinyl monomer compound. Advantageously, the resulting compositions are more easily applied to a substrate, such as paper, in fast-paced coating operations without the significant loss of useful properties, such as the cure rate of the curable composition and the adhesive release behavior of the cured composition.

Curable silicone compositions comprising vinyl monomer

An improved, curable, silicone, release coating composition is provided which cures more rapidly, at lower temperature, and with less residual reactive functionality. The composition contains siloxane polymers bearing higher alkenyl groups with 6 or more carbon atoms and cures by the metal catalyzed reaction of SiH with the alkenyl groups. An improved on-line process for preparing release laminates of substrates and adhesive using the coating composition is further provided.

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Midland, MI, United States of America

John Robert Keryk