A two part moisture curing composition, exhibiting low thermal conductivity, has a part A) and a part B). Part A) comprises either: 1) a siloxane polymer (I) having at least two terminal hydroxyl or hydrolysable groups and a viscosity of from 20,000 to 40,000 mPa.Math.s at 25 C.; or 2) a polymer mixture (II) of polymer (i) a siloxane polymer having at least two terminal hydroxyl or hydrolysable groups and a viscosity25,000 mPa.Math.s at 25 C., and polymer (ii) a siloxane polymer having at least two terminal hydroxyl or hydrolysable groups and a viscosity of between 1,000 and 20,000 mPa.Math.s at 25 C. Part A) further comprises a reinforcing filler and a low-density filler, the total filler content being between 30 and 45% in volume of the total composition. Part B) comprises a moisture curing agent formulation comprising a tin based catalyst and one or more crosslinkers.

A two part moisture curing composition, exhibiting low thermal conductivity, has a part A) and a part B). Part A) comprises either: 1) a siloxane polymer (I) having at least two terminal hydroxyl or hydrolysable groups and a viscosity of from 20,000 to 40,000 mPa.Math.s at 25 C.; or 2) a polymer mixture (II) of polymer (i) a siloxane polymer having at least two terminal hydroxyl or hydrolysable groups and a viscosity25,000 mPa.Math.s at 25 C., and polymer (ii) a siloxane polymer having at least two terminal hydroxyl or hydrolysable groups and a viscosity of between 1,000 and 20,000 mPa.Math.s at 25 C. Part A) further comprises a reinforcing filler and a low-density filler, the total filler content being between 30 and 45% in volume of the total composition. Part B) comprises a moisture curing agent formulation comprising a tin based catalyst and one or more crosslinkers.

A packaging material is provided. The packaging material includes (a) epoxy silsesquioxane, (b) epoxy resin, and (c) siloxane-imide-containing benzoxazine compound. (a) Epoxy silsesquioxane and (b) epoxy resin have a weight ratio of 0.3:1 to 10:1. The total weight of (a) epoxy silsesquioxane and (b) epoxy resin and the weight of (c) siloxane-imide-containing benzoxazine compound have a ratio of 100:20 to 100:150.

A packaging material is provided. The packaging material includes (a) epoxy silsesquioxane, (b) epoxy resin, and (c) siloxane-imide-containing benzoxazine compound. (a) Epoxy silsesquioxane and (b) epoxy resin have a weight ratio of 0.3:1 to 10:1. The total weight of (a) epoxy silsesquioxane and (b) epoxy resin and the weight of (c) siloxane-imide-containing benzoxazine compound have a ratio of 100:20 to 100:150.

A pneumatic tire includes a tread portion composed of a tread rubber composition containing silica. The pneumatic tire exhibits improved processability over time without negatively affecting the wet grip properties and rolling resistance of the tread rubber composition. The tread portion includes a tread rubber composition including: 50 parts by mass to 90 parts by mass of silica, per 100 parts by mass of diene rubber containing 30 mass % to 90 mass % of a terminal-modified diene rubber; an alkylsilane; a fatty acid metal salt a containing an alkali metal element; and a fatty acid ester; and by further compounding, at an amount of 5 mass % to 12 mass % with respect to the silica amount, a sulfur-containing silane coupling agent not containing a mercapto group.

A pneumatic tire includes a tread portion composed of a tread rubber composition containing silica. The pneumatic tire exhibits improved processability over time without negatively affecting the wet grip properties and rolling resistance of the tread rubber composition. The tread portion includes a tread rubber composition including: 50 parts by mass to 90 parts by mass of silica, per 100 parts by mass of diene rubber containing 30 mass % to 90 mass % of a terminal-modified diene rubber; an alkylsilane; a fatty acid metal salt a containing an alkali metal element; and a fatty acid ester; and by further compounding, at an amount of 5 mass % to 12 mass % with respect to the silica amount, a sulfur-containing silane coupling agent not containing a mercapto group.

A surface-treating agent including at least one perfluoro(poly)ether group containing silane compound of the formula (1): ##STR00001##
wherein Rf, PFPE, Z, Q, R.sup.1, R.sup.2, X, Y, e, f, g, h and n are as defined herein. Also disclosed is a process for preparing the compound of formula (1).

A method that has a step (a) of melt-kneading 0.003 to 0.3 part by mass of an organic peroxide, 0.5 to 400 parts by mass of an inorganic filler, and more than 2 parts by mass and 15.0 parts by mass or less of a silane coupling agent, with respect to 100 parts by mass of a resin containing a halogen-containing resin, at a temperature equal to or higher than a decomposition temperature of the organic peroxide, to prepare a silane master batch; a heat-resistant crosslinked resin formed body obtained by the method, a silane master batch, a mixture and a formed body thereof, and a heat-resistant product.

A method that has a step (a) of melt-kneading 0.003 to 0.3 part by mass of an organic peroxide, 0.5 to 400 parts by mass of an inorganic filler, and more than 2 parts by mass and 15.0 parts by mass or less of a silane coupling agent, with respect to 100 parts by mass of a resin containing a halogen-containing resin, at a temperature equal to or higher than a decomposition temperature of the organic peroxide, to prepare a silane master batch; a heat-resistant crosslinked resin formed body obtained by the method, a silane master batch, a mixture and a formed body thereof, and a heat-resistant product.

A method that has a step (a) of melt-kneading 0.003 to 0.3 part by mass of an organic peroxide, 0.5 to 400 parts by mass of an inorganic filler, and more than 2 parts by mass and 15.0 parts by mass or less of a silane coupling agent, with respect to 100 parts by mass of a resin containing a halogen-containing resin, at a temperature equal to or higher than a decomposition temperature of the organic peroxide, to prepare a silane master batch; a heat-resistant crosslinked resin formed body obtained by the method, a silane master batch, a mixture and a formed body thereof, and a heat-resistant product.