The present invention is directed to a method for producing a semi-IPN composite, including: mixing a polyurethane (A) and a polymerization product (B) of a hydrophilic acrylic monomer (b1) and an acrylic monomer (b2) having a hydrolyzable silyl group; and causing the polymerization product (B) to undergo crosslinking. The hydrophilic acrylic monomer (b1) preferably includes an acrylic monomer (b1-1) having an amide group and an acrylic monomer (b1-2) having an oxyethylene group. Further, the polymerization ratio (molar ratio) of the acrylic monomer (b1-1) having an amide group, the acrylic monomer (b1-2) having an oxyethylene group, and the acrylic monomer (b2) having a hydrolyzable silyl group {(b1-1)/(b1-2)/(b2)} is preferably in the range of 50/49.5/0.5 to 89/1/10.

A photoresist composition includes a photoresist polymer including a repeating unit to which a silicon-containing leaving group is combined, a photo-fluorine generator including a sulfonium fluoride, and a solvent.

A photoresist composition includes a photoresist polymer including a repeating unit to which a silicon-containing leaving group is combined, a photo-fluorine generator including a sulfonium fluoride, and a solvent.

A siloxane group-containing silane compound represented by the following formula (1) or (2) wherein each of the symbols in the formulae is as described herein:

R.sup.S1.sub.?X.sup.AR.sup.H.sub.?(1)

RN.sub.?X.sup.AR.sup.S2X.sup.AR.sup.H.sub.?(2).

Also disclosed is a composition containing the siloxane group-containing silane compound and an article including a substrate and a layer on the substrate, wherein the layer is formed of the siloxane group-containing silane compound.

An organosilicon compound includes a mixture of polymeric alkyl silicates. The polymeric alkyl silicates include at least 90% by weight a mixture of polymeric alkyl silicates of the formula (I) [SiO.sub.4/2].sub.a [(R.sup.xO)SiO.sub.3/2].sub.b [(R.sup.yO)SiO.sub.3/2].sub.b [(R.sup.xO).sub.2SiO.sub.2/2].sub.c [(R.sup.xO)(R.sup.yO)SiO.sub.2/2].sub.c [(R.sup.yO).sub.2SiO.sub.2/2].sub.c [(R.sup.xO).sub.3SiO.sub.1/2].sub.d [(R.sup.xO).sub.2(R.sup.yO)SiO.sub.1/2].sub.d [(R.sup.xO)(R.sup.yO).sub.2SiO.sub.1/2].sub.d [(R.sup.yO).sub.3SiO.sub.1/2].sub.d [O.sub.1/2R.sup.zO.sub.1/2].sub.e [O.sub.1/2R.sup.zOH].sub.e [O.sub.1/2R.sup.zOR.sup.X].sub.e [O.sub.1/2R.sup.zOR.sup.y*].sub.e (I). Polymeric alkyl silicates of a formula II are excluded.

An organosilicon compound includes a mixture of polymeric alkyl silicates. The polymeric alkyl silicates include at least 90% by weight a mixture of polymeric alkyl silicates of the formula (I) [SiO.sub.4/2].sub.a [(R.sup.xO)SiO.sub.3/2].sub.b [(R.sup.yO)SiO.sub.3/2].sub.b [(R.sup.xO).sub.2SiO.sub.2/2].sub.c [(R.sup.xO)(R.sup.yO)SiO.sub.2/2].sub.c [(R.sup.yO).sub.2SiO.sub.2/2].sub.c [(R.sup.xO).sub.3SiO.sub.1/2].sub.d [(R.sup.xO).sub.2(R.sup.yO)SiO.sub.1/2].sub.d [(R.sup.xO)(R.sup.yO).sub.2SiO.sub.1/2].sub.d [(R.sup.yO).sub.3SiO.sub.1/2].sub.d [O.sub.1/2R.sup.zO.sub.1/2].sub.e [O.sub.1/2R.sup.zOH].sub.e [O.sub.1/2R.sup.zOR.sup.X].sub.e [O.sub.1/2R.sup.zOR.sup.y*].sub.e (I). Polymeric alkyl silicates of a formula II are excluded.

Provided is a curable composition which is free of organotin compounds to be environmentally friendly and whose cured product shows high elongation and high elastic recovery to be suitable particularly as a sealant. The present invention relates to a curable composition containing a reactive silyl group-containing organic polymer (A) which has a highly active reactive silyl group at a molecular chain end, and a compound (B) having 2 to 10 ethyloxy groups in its molecule but having no amino group in its molecule, the compound (B) being a C1-C20 saturated hydrocarbon having one alkoxysilyl group, a C1-C20 hydrocarbon having two or more alkoxysilyl groups, or a C1-C20 polycarboxylic acid ester.

Provided is a curable composition which is free of organotin compounds to be environmentally friendly and whose cured product shows high elongation and high elastic recovery to be suitable particularly as a sealant. The present invention relates to a curable composition containing a reactive silyl group-containing organic polymer (A) which has a highly active reactive silyl group at a molecular chain end, and a compound (B) having 2 to 10 ethyloxy groups in its molecule but having no amino group in its molecule, the compound (B) being a C1-C20 saturated hydrocarbon having one alkoxysilyl group, a C1-C20 hydrocarbon having two or more alkoxysilyl groups, or a C1-C20 polycarboxylic acid ester.

An adjuvant composition contains lecithin and an organosilicon surfactant as defined herein.

A photoresist composition includes a photoresist polymer including a repeating unit to which a silicon-containing leaving group is combined, a photo-fluorine generator including a sulfonium fluoride, and a solvent.