An epoxy resin composition includes an epoxy resin; a curing agent; alumina particles; and a silane compound which does not have a functional group that is reactive with an epoxy group and which has a functional group that is unreactive with an epoxy group, wherein the silane compound has a structure in which the functional group that is unreactive with an epoxy resin is bound to a silicon atom, or is bound to a silicon atom via a chain hydrocarbon group having 1 to 5 carbon atoms.

An epoxy resin composition includes an epoxy resin; a curing agent; alumina particles; and a silane compound which does not have a functional group that is reactive with an epoxy group and which has a functional group that is unreactive with an epoxy group, wherein the silane compound has a structure in which the functional group that is unreactive with an epoxy resin is bound to a silicon atom, or is bound to a silicon atom via a chain hydrocarbon group having 1 to 5 carbon atoms.

Provided is a millable silicone rubber composition capable of yielding a silicone rubber (cured product) superior in heat resistance. The composition contains: (A) 100 parts by mass of an organopolysiloxane having at least two silicon atom-bonded alkenyl groups in one molecule, and having an average polymerization degree of not lower than 100; (B) 5 to 100 parts by mass of a reinforcing silica having a specific surface area of not smaller than 50 m.sup.2/g; (C) 0.01 to 10 parts by mass of a titanium oxide doped with a transition metal oxide of 0.01 to 5% by mass; (D) 0.01 to 10 parts by mass of a cerium oxide and/or a cerium hydroxide; and (E) 0.01 to 10 parts by mass of a curing agent.

Provided is a millable silicone rubber composition capable of yielding a silicone rubber (cured product) superior in heat resistance. The composition contains: (A) 100 parts by mass of an organopolysiloxane having at least two silicon atom-bonded alkenyl groups in one molecule, and having an average polymerization degree of not lower than 100; (B) 5 to 100 parts by mass of a reinforcing silica having a specific surface area of not smaller than 50 m.sup.2/g; (C) 0.01 to 10 parts by mass of a titanium oxide doped with a transition metal oxide of 0.01 to 5% by mass; (D) 0.01 to 10 parts by mass of a cerium oxide and/or a cerium hydroxide; and (E) 0.01 to 10 parts by mass of a curing agent.

An objective of the present invention is to provide a curable resin composition for forming a cured product having excellent heat resistance, light resistance, flexibility, and toughness. The present invention provides a curable resin composition containing the following components in specific blended amounts. (A): A polyorganosiloxane represented by average unit formula: (SiO.sub.4/2).sub.a1(R.sup.1SiO.sub.3/2).sub.a2(R.sup.1.sub.2SiO.sub.2/2).sub.a3(R.sup.1.sub.3SiO.sub.1/2).sub.a4 R.sup.1 is alkyl, aryl, alkenyl, or the like; a proportion of the alkyl is from 30 to 98 mol %, a proportion of the aryl is from 1 to 50 mol %, and a proportion of the alkenyl is from 1 to 20 mol % relative to a total amount of R.sup.1; and a1>0, a2>0, a30, a4>0, 0.01a1/a210, and a1+a2+a3+a4=1. (B): A polyorganosiloxane having not more than 10 silicon atoms and having a proportion of an alkenyl group relative to a total amount (100 mol %) of the organic groups bonded to the silicon atom from 20 to 60 mol %. (C): An organopolysiloxane represented by average unit formula below: (R.sup.xSiO.sub.3/2).sub.x1(R.sup.x.sub.2SiO.sub.2/2).sub.x2(R.sup.x.sub.2SiR.sup.AR.sup.x.sub.2SiO.sub.2/2).sub.x3(R.sup.x.sub.3SiO.sub.1/2).sub.x4 where R.sup.x is alkyl, aryl, alkenyl, or the like; a proportion of the aryl relative to a total amount of R.sup.x is from 1 to 50 mol %, and at least two of all the R.sup.x moieties are alkenyl; R.sup.A is a divalent hydrocarbon group; and 0.05>x10, x2+x3>0, x4>0, and x1+x2+x3+x4=1. (D) A polyorganosiloxane represented by average composition formula below:
R.sup.2.sub.mH.sub.nSiO.sub.[(4-m-n)/2] where R.sup.2 is alkyl or aryl, and at least two silicon atoms are bonded to hydrogen atoms; and 0.7m2.1, 0.001n1, and 0.8m+n3. (E): A hydrosilylation catalyst.

An objective of the present invention is to provide a curable resin composition for forming a cured product having excellent heat resistance, light resistance, flexibility, and toughness. The present invention provides a curable resin composition containing the following components in specific blended amounts. (A): A polyorganosiloxane represented by average unit formula: (SiO.sub.4/2).sub.a1(R.sup.1SiO.sub.3/2).sub.a2(R.sup.1.sub.2SiO.sub.2/2).sub.a3(R.sup.1.sub.3SiO.sub.1/2).sub.a4 R.sup.1 is alkyl, aryl, alkenyl, or the like; a proportion of the alkyl is from 30 to 98 mol %, a proportion of the aryl is from 1 to 50 mol %, and a proportion of the alkenyl is from 1 to 20 mol % relative to a total amount of R.sup.1; and a1>0, a2>0, a30, a4>0, 0.01a1/a210, and a1+a2+a3+a4=1. (B): A polyorganosiloxane having not more than 10 silicon atoms and having a proportion of an alkenyl group relative to a total amount (100 mol %) of the organic groups bonded to the silicon atom from 20 to 60 mol %. (C): An organopolysiloxane represented by average unit formula below: (R.sup.xSiO.sub.3/2).sub.x1(R.sup.x.sub.2SiO.sub.2/2).sub.x2(R.sup.x.sub.2SiR.sup.AR.sup.x.sub.2SiO.sub.2/2).sub.x3(R.sup.x.sub.3SiO.sub.1/2).sub.x4 where R.sup.x is alkyl, aryl, alkenyl, or the like; a proportion of the aryl relative to a total amount of R.sup.x is from 1 to 50 mol %, and at least two of all the R.sup.x moieties are alkenyl; R.sup.A is a divalent hydrocarbon group; and 0.05>x10, x2+x3>0, x4>0, and x1+x2+x3+x4=1. (D) A polyorganosiloxane represented by average composition formula below:
R.sup.2.sub.mH.sub.nSiO.sub.[(4-m-n)/2] where R.sup.2 is alkyl or aryl, and at least two silicon atoms are bonded to hydrogen atoms; and 0.7m2.1, 0.001n1, and 0.8m+n3. (E): A hydrosilylation catalyst.

The present disclosure relates to a coating agent composition comprising: (A) an organopolysiloxane resin that is solid at 25 C., including a siloxane unit represented by the general formula: R.sup.1.sub.3SiO.sub.1/2 and a siloxane unit represented by the formula: SiO.sub.4/2, a molar ratio of the siloxane unit represented by the general formula: R.sub.3SiO.sub.1/2 to the siloxane unit represented by the formula: SiO.sub.4/2 being from 0.5 to 1.2; (B) an organopolysiloxane that is liquid at 25 C., including in a molecule at least two silicon atom-bonded hydrolyzable groups or hydroxyl groups; (C) a silane compound or a partially hydrolyzed condensate thereof; (D) a catalyst for condensation reaction; and (E) an organic solvent. The present coating agent composition has excellent adhesion to a structure such as mortar and concrete, or a primer layer or an intermediate coating layer on the surface thereof, and can form a thin cured film with low surface tack.

The present disclosure relates to a coating agent composition comprising: (A) an organopolysiloxane resin that is solid at 25 C., including a siloxane unit represented by the general formula: R.sup.1.sub.3SiO.sub.1/2 and a siloxane unit represented by the formula: SiO.sub.4/2, a molar ratio of the siloxane unit represented by the general formula: R.sub.3SiO.sub.1/2 to the siloxane unit represented by the formula: SiO.sub.4/2 being from 0.5 to 1.2; (B) an organopolysiloxane that is liquid at 25 C., including in a molecule at least two silicon atom-bonded hydrolyzable groups or hydroxyl groups; (C) a silane compound or a partially hydrolyzed condensate thereof; (D) a catalyst for condensation reaction; and (E) an organic solvent. The present coating agent composition has excellent adhesion to a structure such as mortar and concrete, or a primer layer or an intermediate coating layer on the surface thereof, and can form a thin cured film with low surface tack.

Described in the present application are methods of producing silane-crosslinked polymer membranes at moderate temperatures using acid catalysts that, in certain embodiments, result in membranes with unexpectedly high permeabilities and selectivities. In certain embodiments, grafting and crosslinking of the silanes occur by immersing a preformed membrane in a solution comprising a silane and an acid catalyst. Alternatively, in certain embodiments, grafting of silanes to a polymer occurs in the presence of acid catalyst in solution and subsequent casting and drying produces crosslinked membranes. In certain embodiments, an acid catalyst is a weak acid catalyst. Also described in the present application are asymmetric crosslinked polymer membranes with porous layers. In certain embodiments, crosslinked cellulose acetate membranes have permeability up to an order of magnitude greater than the permeability of unmodified cellulose acetate membranes. The membranes have porous layers with a high porosity due to their processing in moderate conditions.

Described in the present application are methods of producing silane-crosslinked polymer membranes at moderate temperatures using acid catalysts that, in certain embodiments, result in membranes with unexpectedly high permeabilities and selectivities. In certain embodiments, grafting and crosslinking of the silanes occur by immersing a preformed membrane in a solution comprising a silane and an acid catalyst. Alternatively, in certain embodiments, grafting of silanes to a polymer occurs in the presence of acid catalyst in solution and subsequent casting and drying produces crosslinked membranes. In certain embodiments, an acid catalyst is a weak acid catalyst. Also described in the present application are asymmetric crosslinked polymer membranes with porous layers. In certain embodiments, crosslinked cellulose acetate membranes have permeability up to an order of magnitude greater than the permeability of unmodified cellulose acetate membranes. The membranes have porous layers with a high porosity due to their processing in moderate conditions.