Abstract: The object is to provide, without use of an epoxy resin, a curable composition which has good workability and which has excellent adhesiveness even after an alkaline treatment. The object is attained by providing a curable composition containing: (A) 100 parts by weight of an organic polymer having a hydrolyzable silyl group; (B) 3 parts by weight to 35 parts by weight of at least one type of process oil selected from the group consisting of paraffinic process oils, naphthenic process oils, and aromatic process oils; (C) 20 parts by weight to 200 parts by weight of silica sand; and (D) 2 parts by weight to 10 parts by weight of a silane compound having an epoxy group and/or a silane compound having an amino group.

Abstract: Provided is a curable composition that, while reducing a used amount of (meth)acrylic acid ester monomers having a large number of carbon atoms, yields a cured product which has both good transparency and good elongation. The curable composition contains (A) a silyl group-containing (meth)acrylic-based polymer, (B) a silyl group-containing polyoxyalkylene-based polymer having a number average molecular weight of 20,000 or more, and (C) an aromatic ring-containing plasticizer. Units derived from CH2?C(R1)(COOR2), where R1 is a hydrogen atom or a methyl group, and R2 is a group having nine or more carbon atoms, account for 5% by weight or less of all structural units of (A). The curable composition contains 60 parts by weight or more of (C) with respect to 100 total parts by weight of (A) and (B), and a cured product has a haze of 55 or less, the haze being obtained through a curing test.

Abstract: Provided is a curable composition that, while reducing a used amount of (meth)acrylic acid ester monomers having a large number of carbon atoms, yields a cured product which has both good transparency and good elongation. The curable composition contains (A) a silyl group-containing (meth)acrylic-based polymer, (B) a silyl group-containing polyoxyalkylene-based polymer having a number average molecular weight of 20,000 or more, and (C) an aromatic ring-containing plasticizer. Units derived from CH2?C(R1)(COOR2), where R1 is a hydrogen atom or a methyl group, and R2 is a group having nine or more carbon atoms, account for 5% by weight or less of all structural units of (A). The curable composition contains 60 parts by weight or more of (C) with respect to 100 total parts by weight of (A) and (B), and a cured product has a haze of 55 or less, the haze being obtained through a curing test.

Abstract: A transparent curable composition includes 100 parts by weight of a polyoxyalkylene-based polymer (A); and 0.1 to 20 parts by weight of a weathering stabilizer (B). The polyoxyalkylene-based polymer (A) has a reactive silicon group that can be crosslinked by forming a siloxane bond, and the weathering stabilizer (B) is a hindered-amine-based photostabilizer (B1).

Abstract: A pyranometer comprises: a light sensor; a first lens arranged to face a light-receiving surface of the light sensor; and a light-shielding ring arranged between the light sensor and the first lens, the light-shielding ring having a light-transmissive region allowing transmission of light at some angles of incidence in the light passing through the first lens.

Abstract: 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.

Abstract: A transparent curable composition includes 100 parts by weight of a polyoxyalkylene-based polymer (A); and 0.1 to 20 parts by weight of a weathering stabilizer (B). The polyoxyalkylene-based polymer (A) has a reactive silicon group that can be crosslinked by forming a siloxane bond, and the weathering stabilizer (B) is a hindered-amine-based photostabilizer (B1).

Abstract: A curable composition includes (A) an organic polymer having a reactive silyl group; (B) at least one ester compound (except for compounds having a methyl ester group) selected from the group consisting of isophthalic acid ester compounds, terephthalic acid ester compounds, 1,3-cyclohexanedicarboxylic acid ester compounds, and 1,4-cyclohexanedicarboxylic acid ester compounds; and (C) a compound having a methyl ester group.

Abstract: 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.

Abstract: The present invention provides a sealant composition that includes a reactive silyl group-containing organic polymer, and gives a cured product having a low modulus and not having wrinkles or cracks on the surface even though the sealant includes as a curing catalyst a tetravalent tin compound, which is presumed to reduce recovery. The sealant composition is a one-component curable sealant composition including: a linear organic polymer (A) having a number average molecular weight of 11,000 to 30,000, and having an ethanol-elimination reactive silyl group at a molecular terminal; a tetravalent tin compound (B); and a plasticizer (C).

Abstract: A curable composition includes (A) an organic polymer having a reactive silyl group; (B) at least one ester compound (except for compounds having a methyl ester group) selected from the group consisting of isophthalic acid ester compounds, terephthalic acid ester compounds, 1,3-cyclohexanedicarboxylic acid ester compounds, and 1,4-cyclohexanedicarboxylic acid ester compounds; and (C) a compound having a methyl ester group.

Abstract: A curable composition includes (A) an organic polymer having a silicon-containing group, which can be crosslinked by forming a siloxane bond (100 parts by weight), (B) a diester compound obtained from polyethylene glycol and aliphatic monocarboxylic acid and/or alicyclic monocarboxylic acid (21-300 parts by weight), and (C) an amidine compound (0.01-20 parts by weight).

Abstract: An organic polymer, having a number-average molecular weight of 800 to 15,000, and comprising 0.5 or more but less than 1.2 reactive silicon groups in each molecule of the polymer on average, in which the reactive silicon groups are introduced into one-side out of terminals thereof, and heightening, in particular, the proportion of molecules (of the polymer) into each of which the silicon group is introduced.

Abstract: An object of the present invention is to provide a curable composition that provides high hardness and can be used in adhesives and coating agents. This object can be achieved by a curable composition containing: 100 parts by weight of a reactive silyl group-containing organic polymer (A) that has a number average molecular weight of 2,000 to 6,000 and contains 1.3 to 5 reactive silyl groups per molecule; and 0 to 40 parts by weight of a plasticizer (C). This curable composition is suitable for flooring adhesives and tile adhesives, which require high hardness.

Abstract: The present invention aims to provide a curable composition without adverse effects on the environment, which exhibits excellent curability without containing a toxic organotin curing catalyst, and gives a cured product that does not have discoloration and cracks on the surface thereof even after being exposed to the atmosphere and ultraviolet light for a long time. The present invention also aims to provide the cured product. The curable composition comprises: (A) an organic polymer having a reactive silyl group; (B) a guanidine compound having a specific structure; and (C) a phosphorus compound that has an aryl group, has a phosphorus atom with an oxidation number of +5, and has a melting point of 23° C. or higher.

Abstract: Provided is a curable composition that has low modulus, high elongation and low viscosity, and can be used for building sealing materials. This curable composition includes: an organic polymer (A) containing on average at least 1.4 reactive silyl groups per molecule; and an organic polymer (B) containing on average less than one reactive silyl group per molecule, wherein the number average molecular weight of component (B) is lower than the number average molecular weight of component (A) by at least 3,000, and the ratio (y)/(x) of the number of moles (y) of organic polymers containing only one reactive silyl group per molecule among components (A) and (B) to the number of moles (x) of organic polymers containing at least 2 reactive silyl groups per molecule among components (A) and (B) is not more than 5.

Abstract: The present invention provides a sealant composition that includes a reactive silyl group-containing organic polymer, and gives a cured product having a low modulus and not having wrinkles or cracks on the surface even though the sealant includes as a curing catalyst a tetravalent tin compound, which is presumed to reduce recovery. The sealant composition is a one-component curable sealant composition including: a linear organic polymer (A) having a number average molecular weight of 11,000 to 30,000, and having an ethanol-elimination reactive silyl group at a molecular terminal; a tetravalent tin compound (B); and a plasticizer (C).

Abstract: An object of the invention is to yield a highly transparent cured article wherein bubbles are less generated when a catalyst and others are added to a curable composition that contains an organic polymer having a silicon-containing group which can be crosslinked by the formation of a siloxane bond and then the resultant mixture is stirred. Another object thereof is to provide a cured article which is small in surface stickiness, slightly gets dirty over a long term, and has a practical adhesiveness. These objects are attained by a curable composition which comprises (A) an organic polymer having a silicon-containing group that can be crosslinked by the formation of a siloxane bond, (B) a bivalent tin carboxylate and (C) an amine compound having no reactive silicon group, and which turns transparent when cured; or a transparent cured article obtained by curing the composition.

Abstract: The present invention provides a curable composition mainly comprising an organic polymer containing a reactive silyl group, which is free from toxic organotin catalysts so as to be environmentally friendly and maintains good surface properties after being cured. The curable composition of the present invention comprises: (A) an organic polymer having a silyl group cross-linkable by siloxane bond formation; (B) a carboxylic acid and/or a carboxylate metal salt; (C) an amine compound; and (D) a phosphorus compound having an aryl group and a melting point of 23° C. or higher.

Abstract: Provided is a curable composition that has low modulus, high elongation and low viscosity, and can be used for building sealing materials. This curable composition includes: an organic polymer (A) containing on average at least 1.4 reactive silyl groups per molecule; and an organic polymer (B) containing on average less than one reactive silyl group per molecule, wherein the number average molecular weight of component (B) is lower than the number average molecular weight of component (A) by at least 3,000, and the ratio (y)/(x) of the number of moles (y) of organic polymers containing only one reactive silyl group per molecule among components (A) and (B) to the number of moles (x) of organic polymers containing at least 2 reactive silyl groups per molecule among components (A) and (B) is not more than 5.