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AssigneeSika Corporation
InventorsChin-Jui Chang, Gerald Fitzgerald
Estimating the term…
Expandable sealant and baffle compositions and methods of forming and using such compositions are provided wherein the compositions comprise a first thermoplastic resin, an epoxy resin, preferably a second thermoplastic resin different from the first thermoplastic resin, and optionally a compound selected from the group consisting of pigments, blowing agents, catalysts, curing agents, reinforcers, and mixtures thereof. The resulting compositions are formed as self-sustaining bodies which can be heat-expanded into a lightweight, high strength product for sealing hollow structural members of vehicles, substantially decreasing the noise which travels along the length of those members as well as strengthening those members with minimal increases in their weights. In a preferred embodiment, the first thermoplastic resin is an SBS block co-polymer, the epoxy resin is a bisphenol A-based liquid epoxy resin, the second thermoplastic resin is a polystyrene, and the reinforcer is hydrated amorphous silica. The compositions can be formed into free-standing, self-sustaining parts or into U-shaped members supported on lattice-type nylon supports.
An expandable sealing body useful for reinforcing cavities in a vehicle, said body comprising a synthetic resin composition including a quantity of a polystyrene having a molecular weight of from about 150,000-320,000, said polystyrene being mixed with from about 30-45% by weight of an epoxy resin, said body exhibiting at least about 95% expansion and having a compressive strength of at least about 1200 psi after heating of the body to a temperature of at least about 300° F.
An expandable sealing body useful for reinforcing cavities in a vehicle, said body comprising a synthetic resin composition including a quantity of a rubber selected from the group consisting of an SBS block co-polymers, styrene-butadiene rubbers, nitrile-butadiene rubbers, and mixtures thereof, said rubber being mixed with from about 30-45% by weight of an epoxy resin, said body exhibiting at least about 95% expansion and having a compressive strength of at least about 1200 psi after heating of the body to a temperature of at least about 300° F.
An expandable sealing body useful for reinforcing cavities in a vehicle, said body comprising a synthetic resin composition including a quantity of an SBS block co-polymer having a molecular weight of from about 100,000-150,000, said SBS block co-polymer being mixed with from about 30-45% by weight of an epoxy resin, said body exhibiting at least about 95% expansion and having a compressive strength of at least about 1200 psi after heating of the body to a temperature of at least about 300° F.
An expandable sealing body useful for reinforcing cavities in a vehicle, said body comprising a synthetic resin composition including from about 5-20% by weight of a polystyrene mixed with from about 30-45% by weight of an epoxy resin, said body exhibiting at least about 95% expansion and having a compressive strength of at least about 1200 psi after heating of the body to a temperature of at least about 300° F.
An expandable sealing body useful for reinforcing cavities in a vehicle, said body comprising a synthetic resin composition including:
An injection moldable, reinforcing sealant and baffle body comprising an expanded, self-sustaining synthetic resin composition, said composition comprising:
A sealant and baffle device for sealing a cavity of a vehicle body, said device comprising:
A sealant and baffle device for sealing a cavity of a vehicle body, said device comprising:
Dependencies are inferred from the claim text.