3M Innovative Properties Company

Jiangdong Tong

Ashok Sengupta

Hui Zhu

David Edward Livingstone

A free-standing solid composite intumescent structure has at least one bendable metal mesh, preferably at least two, secured on or in a bendable intumescent sheet material. The structure is bendable by a bending force into a shape at a temperature above &#x2212;10&#xb0; C. while retaining the bended shape when the bending force is removed. The intumescent sheet material has 10 wt % or more, based on total weight of the sheet material, of a polymeric resin; inorganic filler; and, an intumescent component. Fire protection barriers can be made from the free-standing solid composite intumescent structure, which can be used in fire protection systems where the fire protection barrier is installed on a substrate, for example steel building elements.

Solid composite intumescent structures for fire protection

A solid intumescent material is made of a of about 30 wt % or less, based on total weight of the intumescent material, of a hot melt thermoplastic or elastomeric resin (e.g. an EVA resin), a reinforcing material (e.g. glass fibers having an aspect ratio of at least about 100), inorganic filler and an intumescent component (e.g. ammonium polyphosphate, pentaerythritol and melamine). The intumescent material may be formed into fire protection barriers of various thicknesses and may be shaped at a temperature well below the activation temperature of the intumescent material to permit conforming the barrier to requirements at a job site.

Hot melt intumescent materials for fire protection

An intumescent fire protection barrier in the form of an adhesive sheet or continuous roll of tape. The barrier comprises laminated layers of an intumescent material, a reinforcing matrix, a pressure sensitive adhesive and a release liner. The intumescent material is adhesively applied to a structural steel substrate and expands by at least 10 times its original thickness during a fire to provide fire protection to the substrate. Multiple layers of the fire protection barrier may be installed on top of one another. This application method dramatically reduces installation time as compared with sprayed on fire protection coatings.

Multi-layer intumescent fire protection barrier with adhesive surface

A liner is the product of reaction of (a) a hydrophilic prepolymer bearing isocyanate groups; and (b) a water-borne polymer dispersion, the polymer bearing groups that are reactive to isocyanate groups; wherein the dispersion has a sufficiently high solids content, and the polymer has a sufficiently high modulus and glass transition or crystalline melting temperature, that the product of reaction exhibits a 24-hour Tensile Strength of at least about 2.5 MPa.

Sprayable mining liner

The invention provides a process for reducing the amount of monomeric polyisocyanate in a composition comprising a polymer or oligomer bearing isocyanate groups, the method comprising reacting the composition with a quenching agent, the quenching agent comprising an arylalkyl alcohol and an alkoxysilane bearing a secondary amino group.

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London, Canada

Jiangdong Tong