Patent ID: 7776935

Claim:
A method of preparing a silicone elastomer porous material, comprising: providing a water-in-oil emulsion comprising a liquid silicone rubber material which forms a silicone elastomer upon curing, a silicone oil material which has a surface activation function, and water droplets dispersed in the liquid silicone rubber material; subjecting the emulsion to a primary heating, thereby curing the liquid silicone rubber material to form a silicone elastomer and confining the water droplets within the silicone elastomer substantially as they are present in the emulsion; and subjecting the silicone elastomer confining the water droplets therein to a secondary heating, thereby evaporating and removing the water droplets from the silicone elastomer, thereby forming the silicone elastomer porous material; wherein the silicone oil material has a hydrophilic group; and wherein the silicone oil material comprises a mixture of a first ether-modified silicone oil and a second ether-modified silicone oil, and a difference in HLB value between the first ether-modified silicone oil and the second ether-modified silicone oil is at least 3.