A well treatment composition for use in a hydrocarbon-bearing reservoir comprising a reversible aminal gel composition. The reversible aminal gel composition includes a liquid precursor composition. The liquid precursor composition is operable to remain in a liquid state at about room temperature. The liquid precursor composition comprises an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a metal salt composition. The liquid precursor composition transitions from the liquid state to a gel state responsive to an increase in temperature in the hydrocarbon-bearing reservoir. The gel state is stable in the hydrocarbon-bearing reservoir at a temperature similar to a temperature of the hydrocarbon-bearing reservoir, and the gel state is operable to return to the liquid state responsive to a change in the hydrocarbon-bearing reservoir selected from the group consisting of: a decrease in pH in the hydrocarbon-bearing reservoir and an addition of excess metal salt composition in the hydrocarbon-bearing reservoir.

A medical device including a silicone hydrogel which is less likely to harden due to drying, and which is less likely to cause stimulation at a site in contact with a human body, is disclosed. The medical device includes a silicone hydrogel satisfying the following conditions: (1) the water content in hydrous state is within the range of 10% by mass to 70% by mass; (2) the content of silicon atoms with respect to the total mass in dry state is within the range of 8% by mass to 30% by mass; and (3) the tensile elastic modulus in dry state is within the range of 0.1 MPa to 3.5 MPa.

Provided are: a silicone gel composition providing a silicone gel cured product having excellent heat resistance at high temperatures; and a cured product (silicone gel) thereof. This silicone gel composition is an addition reaction-curable silicone gel composition containing, with respect to the total (mass) of the composition, 1-1,000 ppm of a niobium carboxylate and/or nickel carboxylate represented by the following formula (3).
(R.sup.3COO).sub.fM(3)
(In the formula, R.sup.3 is a homogeneous or heterogeneous monovalent hydrocarbon group, M is at least one metal selected from among nickel and niobium, and f is 2 when M is nickel and 4 or 5 when M is niobium).

A well treatment composition for use in a hydrocarbon-bearing reservoir, optionally as a kill pill, and comprising a reversible aminal gel composition. The reversible aminal gel composition includes a liquid precursor composition. The liquid precursor composition is operable to remain in a liquid state at about room temperature. The liquid precursor composition comprises an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a metal salt composition. The liquid precursor composition transitions from the liquid state to a gel state responsive to an increase in temperature in the hydrocarbon-bearing reservoir. The gel state is stable in the hydrocarbon-bearing reservoir at a temperature similar to a temperature of the hydrocarbon-bearing reservoir, and the gel state is operable to return to the liquid state responsive to a change in the hydrocarbon-bearing reservoir selected from the group consisting of: a decrease in pH in the hydrocarbon-bearing reservoir and an addition of excess metal salt composition in the hydrocarbon-bearing reservoir.

A medical device including a silicone hydrogel which is less likely to harden due to drying, and which is less likely to cause stimulation at a site in contact with a human body, is disclosed. The medical device includes a silicone hydrogel satisfying the following conditions: (1) the water content in hydrous state is within the range of 10% by mass to 70% by mass; (2) the content of silicon atoms with respect to the total mass in dry state is within the range of 8% by mass to 30% by mass; and (3) the tensile elastic modulus in dry state is within the range of 0.1 MPa to 3.5 MPa.

The invention relates to new oil gelling polyurethanes useful for preparing clear gels in organic media (oils, solvents) and to a process for their preparation. The invention also relates to the gels formed from these gelling polyurethanes and to compositions containing them, in particular cosmetic compositions.

A well treatment composition for use in a hydrocarbon-bearing reservoir comprising a reversible aminal gel composition. The reversible aminal gel composition includes a liquid precursor composition. The liquid precursor composition is operable to remain in a liquid state at about room temperature. The liquid precursor composition comprises an organic amine composition; an aldehyde composition; a polar aprotic organic solvent; and a metal salt composition with valence 3, 4, or 5. The liquid precursor composition transitions from the liquid state to a gel state responsive to an increase in temperature in the hydrocarbon-bearing reservoir. The gel state is stable in the hydrocarbon-bearing reservoir at a temperature similar to a temperature of the hydrocarbon-bearing reservoir, and the gel state is operable to return to the liquid state responsive to a change in the hydrocarbon-bearing reservoir selected from the group consisting of: a decrease in pH in the hydrocarbon-bearing reservoir and an addition of excess metal salt composition in the hydrocarbon-bearing reservoir.

A cooling support cushion and method of forming same is provided. In particular, the present cooling support cushions and methods of producing the same make use of a plurality of surface coatings to a base layer to provide an extended cooling effect. The surface coating may be mixed and applied or may be applied as separated layers.

An aspect of the present invention is directed to a vibration damping material for use in a mount part for supporting a motor, the vibration damping material including: a gel of a dehydration condensation reaction product of silicone oil and boric acid, wherein the boric acid is in an amount of 25 to 75 moles based on 100 moles of the total amount of the silicone oil and the boric acid.

Provided is an oil gel comprising a chain polyurethane (A) and a paraffin based oil (B), wherein the chain polyurethane (A) is a chain polyurethane (A1) formed by polymerization of a chain diol (x) and a diisocyanate (y), and the paraffin based oil (B) is a paraffin based oil (B1) having a kinetic viscosity at 40 C. of 20 mm.sup.2/s or more and 100 mm.sup.2/s or less, and the chain polyurethane (A1) is included at a proportion of 10% by mass or more and 50% by mass or less based on the total amount of the chain polyurethane (A1) and the paraffin based oil (B1). Also provided is a pressure proof material for protecting an electronic device.