Abstract: A composition cureable to a solid crosslinked polyorganosiloxane comprises:a) a norbornene functional silicone prepolymer having a plurality of groups of the formula: ##STR1## bound to silicone atoms thereof, where R is H or methyl, R.sup.1 is a direct bond of --C(.dbd.O)O-- and R.sup.4 is ethylene, ethenylene, propylene or propenylene,b) a coreactive silicone prepolymer selected from SiH functional silicones, and alkylthiol functional silicones, said polyorganosiloxanes (a) and (b) being present in an equivalent ratio of between 2:1 and 1:2 norbornene to silicon hydride or alkyl thiol groups, andc) an effective amount of a hydrosilation or thiol-ene cure catalyst, respectively.

Abstract: A composition curable to a solid crosslinked polyorganosiloxane comprises:(a) an acrylic functional silicone prepolymer having a plurality of acrylic groups of the formula: ##STR1## bound to silicon atoms thereof, where R is H or methyl, and R.sup.1 is a divalent olefinically unsaturated hydrocarbon group,(b) a silicone prepolymer having a plurality of organothiol groups thereon, and(c) an effective amount of a thiol-ene cure catalyst.Particularly preferred formulations are photoinitiated formulations employing alkylthiol functional silicones in which the total number of thiol groups is between 0.5 and 1.5 times the total number of ene groups counting both the acrylic and the linking group R.sup.1 as ene groups.

Abstract: Novel polyorganosiloxane polymers having at least one terminal cyclic diorganosiloxane moiety containing a plurality of acrylic units of the formula ##STR1## wherein R.sup.1 is H or lower alkyl; X is O, NH or S; and Y is a divalent linking group.

Abstract: A method of curing a liquid silicone composition to a crosslinked polymer on a substrate having shadow areas no readily accessible to direct UV light, the method comprising:(a) applying a liquid composition to the substrate in a manner so as to cover both the light accessible and the shadow areas, the composition comprising a radical photoinitiator and a crosslinkable polydihydrocarbylsiloxane prepolymer having a molecular weight of at least 1000, having a plurality of acrylate or methacrylate groups bound thereto and further including a plurality of groups of the formula ##STR1## where R.sup.1 is a hydrolyzable organic group and R.sup.2 is R.sup.1 or, if R.sup.1 is dialkylamino, R.sup.2 is R.sup.1 or hydrocarbyl;(b) irradiation the substrate with UV irradiation sufficient to substantially cure the composition in the areas directly accessible to UV light, and(c) exposing the composition on the substrate to moisture for sufficient time to cure the composition in the shadow areas.

Abstract: Compositions of (a) a silicone resin characterized by an intermediate region free of acrylic groups, at least 150 siloxane units long, and terminal acrylic groups; (b) at least 10% of a fumed silica filler; and (c) a photoinitiator, can be cured by UV irradiation to tough elastomeric materials useful in adhesive and sealant applications.

Abstract: Polyorganosiloxanes having an average of more than two siloxane repeat units, at least one of which repeat units includes a photoinitiating group bound to the silicon atom thereof, the photoinitiating group having the formula ##STR1## where R.sup.1 and R.sup.2 are the same or different alkyl groups or R.sup.1 and R.sup.2 are alkylene groups linked to each other so that R.sup.1 and R.sup.2 together with the carbon atom to which both are attached comprise a cycloalkyl group, and R.sup.3 is H or hydrocarbyl.Compositions of these polyorganosiloxanes and silicones or organic monomers with free radical curable groups are readily cured by irradiation with UV light.

Abstract: Methacrylated siloxanes are prepared by hydrosilation of beta(allyloxy)ethyl methacrylate using a silicon hydride functional siloxane. Propene elimination is not a significant side reaction of the method. Methacrylated silicones prepared in accordance with the invention are capable of anaerobic cure.

Abstract: A polyorganosiloxane polymer having a structure represented by one of the formulas(AB).sub.m C or [(AB).sub.m ].sub.n SiR.sub.(4-n)where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith; A is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which are acrylic groups containing repeat units represented by the formula ##STR1## where R.sup.1 is H or lower alkyl, R.sup.2 is alkylene or alkenylene, and y is 0-4; B is a polyorganopolysiloxane segment represented by the formula ##STR2## where x is an integer of at least 100; C is A or a triorganosilyl group; m is an integer of 1 or more; and n is 3 or 4.

Abstract: Novel dual curing silicones are terminated with acrylic functional dialkoxy or diaryloxy silyl groups. They are prepared by condensation of a silanol terminated silicone with a silane represented by the formula ##STR1## where R.sup.3 is alkyl or aryl, R.sup.4 is H or C.sub.1-5 alkyl and R.sup.5 is alkylene, the ratio of silane to silanol silicone being between about 2.1 and 6.1.Compositions of the novel silicones with moisture cure catalysts, photoinitiators and optionally up to 70% trimethyl silyl terminated silicone oils, are both moisture and UV curable and produce soft gel or rubbery cured materials suitable for electronic potting applications.

Abstract: Polymers having .alpha.-alkylacrylate functionality may be prepared by hydrosilating an aliphatically unsaturated polymer with a grafting agent of structure (A) or (B): ##STR1## where R.sup.1 is an alkyl group; R.sup.2 is a divalent group nonreactive under hydrosilation conditions; n is 0, 1, 2, 3, or 4; x and y are 0, 1, 2, 3 or 4 and x+y=1, 2, 3 or 4; and, the R.sup.3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl or ##STR2## groups. Preferred olefinically unsaturated polymers include homopolymers and copolymers of butadiene or alkyl substituted butadiene and polyorganosiloxanes with unsaturated hydrocarbyl groups such as vinyl or allyl.

Abstract: Novel copolymeric silicones including repeat units of the formulaR.sub.a.sup.1 R.sub.b.sup.2 SiO.sub.(4-a-b)/2 (I)and repeat units of the formulaR.sub.a.sup.3 R.sub.b.sup.4 SiO.sub.(4-a-b)/2 (II)where R.sup.1, R.sup.2 and R.sup.3 are the same or different alkyl, haloalkyl, aryl, substituted aryl, alkoxy or aryloxy groups; R.sup.4 is ##STR1## where R.sup.5 is H or alkyl and R.sup.6 is an unsaturated divalent hydrocarbon group; a is an integer from 0-2, b is an integer from 1-3 and a+b=1, 2 or 3; and the repeat units of formula II represent no more than about 30% of the total copolymer repeat units.The copolymers may be rapidly cured by UV light to give useful elastomers or coating films. They may also be cured with traditional peroxide methods including heat and anaerobic activated methods. They are readily prepared by hydrosilation of acrylate or 2-alkylacrylate esters of acetylenic alcohols with SiH functional silicones.

Abstract: Polyurethane foam formulations containing halogenated phosphate ester additives are inhibited against scorching through the use of an effective amount of 4,4'-bis(.alpha., .alpha.-dimethylbenyl)diphenylamine.

Abstract: Selected amino ethers are disclosed for use as catalysts in the preparation of polyurethane foam.

Abstract: Selected amines are used as catalysts in the preparation of polyurethane foam.