This UV curable silicone composition contains (A) an organopolysiloxane represented by general formula (1)

##STR00001##

[R.sup.1 represents a monovalent hydrocarbon group having 1-20 carbon atoms, R.sup.2 represents an aromatic group, X represents a group represented by formula (2), a, m, and n respectively represent numbers in the ranges of 1≤a≤3, 1≤m≤2,000, 1≤n≤2,000, and m/(n+m)≥0.01 is satisfied.

##STR00002##

(R.sup.1 is as defined above. R.sup.3 represents an oxygen atom or an alkylene group having 1-20 carbon atoms, R.sup.4 represents an acryloyloxyalkyl group, a methacryloyloxyalkyl group, an acryloyloxyalkyloxy group, or a methacryloyloxyalkyloxy group, p represents a number in the range of 0≤p≤10, and c represents a number in the range of 1≤c≤3)], (B) a mono-functional (meth)acrylate compound not containing a siloxane structure, and (C) a photopolymerization initiator, and provides, as a temporary fixing material, a cured product having excellent adhesiveness and rubber strength.

Disclosed herein is a composition comprising a first block copolymer that comprises a first block and a second block; where the first block has a higher surface energy than the second block; a second block copolymer that comprises a first block and a second block; where the first block of the first block copolymer is chemically the same as or similar to the first block of the second block copolymer and the second block of the first block copolymer is chemically the same as or similar to the second block of the second block copolymer; where the weight percent based on total solids of the first block of the second block copolymer is greater than that of the first block of the first block copolymer; where the first block copolymer phase separates into a first morphology of cylindrical or lamellar domains when disposed singly on a substrate.

The invention provides a class of high RI polysiloxane vinylic crosslinkers. Each of the polysiloxane vinylic crosslinkers of the invention comprise (1) a polysiloxane segment comprising dimethylsiloxane units and aryl-containing siloxane units each having one methyl substituent and one organic substituent having up to 45 carbon atoms and at least one aryl moiety which is linked to Si atom through a linker having at least 2 (preferably 3) carbon atoms; (2) ethylenically-unsaturated groups. The invention also provides an insert or silicone hydrogel contact lens which comprises a crosslinked polymeric material comprising repeating units of at least one of such a class of high RI polysiloxane vinylic crosslinkers.

The invention provides a class of high RI polysiloxane vinylic crosslinkers. Each of the polysiloxane vinylic crosslinkers of the invention comprise (1) a polysiloxane segment comprising dimethylsiloxane units and aryl-containing siloxane units each having one methyl substituent and one organic substituent having up to 45 carbon atoms and at least one aryl moiety which is linked to Si atom through a linker having at least 2 (preferably 3) carbon atoms; (2) ethylenically-unsaturated groups. The invention also provides an insert or silicone hydrogel contact lens which comprises a crosslinked polymeric material comprising repeating units of at least one of such a class of high RI polysiloxane vinylic crosslinkers.

This invention relates to copolymers AB having moieties derived from vinyl-terminated polysiloxanes A with more than one vinyl group bound to the polysiloxane, and moieties derived from two or more alkyl esters B of an olefinically unsaturated carboxylic acid, wherein at least two different alkyl esters B1 and B2 are used; the alkyl group of the first alkyl ester B1 of an olefinically unsaturated carboxylic acid has from one to five carbon atoms, the alkyl group of the second alkyl ester B2 of an olefinically unsaturated carboxylic acid has from six to thirty carbon atoms, and moieties derived from at least one hydroxyalkyl ester B3 of an olefinically unsaturated carboxylic acid, the ester B3 having at least one hydroxyl group in the alkyl group, and from two to six carbon atoms in the alkyl group, to a process for their preparation, and to a method of use thereof as flow modifiers in coating compositions.

Pressure sensitive adhesive compositions are described comprising at least one low Tg ethylenically unsaturated monomer, and at least one silsesquioxane polymer crosslinker comprising a plurality of ethylenically unsaturated groups. The low Tg ethylenically unsaturated monomer typically has a Tg no greater than 10° C. In some embodiments, the composition comprises at least 50, 55, 60, 65, or 70 wt-% of low Tg ethylenically unsaturated monomer. The low Tg ethylenically unsaturated monomer is typically an alkyl (meth)acrylate comprising 4 to 20 carbon atoms. In another embodiment, an adhesive composition is described comprising a syrup. The syrup comprising i) a free-radically polymerizable solvent monomer; ii) a solute (meth)acrylic polymer comprising polymerized units derived from one or more alkyl (meth)acrylate monomers, and iii) at least one silsesquioxane polymer crosslinker comprising a plurality of ethylenically unsaturated groups. The free-radically polymerizable solvent monomer, polymerized units of the solute (meth)acrylic polymer, or a combination thereof comprise a low Tg ethylenically unsaturated monomer. Also described are pressure sensitive adhesive articles and method of preparing adhesive articles.

A hydrophobic hybrid organosiloxane nano latex is provided as the copolymerizate of: (a) organosiloxane monomer of the general formula M.sub.aM.sup.v.sub.bD.sub.cD.sup.v.sub.dT.sub.eT.sup.v.sub.fQ.sub.g
wherein: M=R.sub.1R.sub.2R.sub.3SiO.sub.1/2, M.sup.v=R.sub.4R.sub.5R.sub.uSiO.sub.1/2, D=R.sub.6R.sub.7SiO.sub.2/2, D.sup.v=R.sub.8R.sub.uSiO.sub.2/2, T=R.sub.9SiO.sub.3/2, T.sup.v=R.sub.uSiO.sub.3/2, and Q=SiO.sub.4/2 in which R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8 and R.sub.9 each independently is hydrogen, a hydroxyl group, a hydrocarbyl group having up to 100 carbon atoms and optionally containing at least one hetroatom; R.sub.u is a free-radical polymerizable group; subscripts a, b, c, d, e, f and g each independently range from 0 to 10,000 subject to the limitation that b+d+f is at least 1, p, q and r are integers independently selected from 0 to 100 and subscript h is 0 or 1; and, (b) monomer possessing a group which is free-radical copolymerizable with group R.sub.u of organosiloxane monomer (a).

One-pot synthetic methods are disclosed for synthesizing curable, antimicrobial silsesquioxane-silica hybrids by hydrolytically co-condensing a tetraalkoxysilane with two different trialkoxysilanes. Particles are also disclosed that are substantially spherical and have an ordered lamellar internal structure. In addition, polymers prepared front the curable, antimicrobial silsesquioxane-silica hybrids and co-monomers are disclosed.

One-pot synthetic methods are disclosed for synthesizing curable, antimicrobial silsesquioxane-silica hybrids by hydrolytically co-condensing a tetraalkoxysilane with two different trialkoxysilanes. Particles are also disclosed that are substantially spherical and have an ordered lamellar internal structure. In addition, polymers prepared front the curable, antimicrobial silsesquioxane-silica hybrids and co-monomers are disclosed.

An objective is to provide a surface-protective PSA sheet capable of reducing adherend damage and well maintaining appearance, etc. The surface-protective PSA sheet capable of reducing adherend damage and well maintaining appearance, etc., comprises a surface layer, a resin substrate layer and a PSA layer, and has a multilayer structure with the resin substrate layer placed between the surface layer and the PSA layer, wherein the surface layer is a layer obtainable by curing a heat-curable composition comprising the following components: (a) a hydroxyl group-containing (meth)acrylic copolymer having a glass transition temperature of −40° C. to 30° C.; (b) an allophanate polyisocyanate and/or a biuret polyisocyanate; and (c) a polysiloxane comprising a hydroxyl group-containing hydrocarbon group and/or polymer.