Patent ID: 8022130

Claim:
Adhesive and sealant composition comprising a member selected from the group consisting of polyurethane, unsaturated polyester resins, vinyl ester resins, acrylates, polyvinyl acetate, polyvinyl alcohol, polyvinyl ether, ethylene vinyl acetate, ethylene-acrylic acid copolymers, polyvinyl acetates, polyvinyl chloride, chloroprene rubber, nitrile rubber, butyl rubber, polysulfide, fluorinated hydrocarbons saturated polyesters and copolyesters, urea-formaldehyde resins, melamine-formaldehyde resins, polyimides, polybenzimidazoles, and polysulfones, containing 1 wt. % to 15 wt. % of a compacted hydrophobic, pyrogenic silica having a compacted bulk density of 60 g/l to 200 g/l, a BET surface area of 80 to 290 m 2 /g and a carbon content of 1.0 to 6.5 wt. %, wherein the silica has been compacted by a pressing filter belt and as a result of said silica being compacted in such way said adhesive and sealant composition is rendered thixotropic and the time required for incorporating said compacted hydrophobic pyrogenic silica into said adhesive and sealant composition is reduced compared to the time required for incorporation into said composition of silica that has not been compacted by a pressing filter belt, and wherein the silica has been made hydrophobic with a silicone oil, with an octyl silane, with hexadimethyl disilazane, with a methacrylate silane, or with an octamethyl cyclotetrasiloxane.