Patent

A polymerizable adhesive composition comprises at least one α-cyanoacrylate monomer and at least one absorbable viscosity modifying agent. The absorbable viscosity modifying agent has repeated units of the following structure: - R1 is a methyl group or a hydrogen. R2 is a straight, branched or cyclic alkyl group having from 1 to 6 carbon atoms. R3 is a s straight, branched or cyclic alkyl group having from 1 to 12 carbon atoms, and n is 2 or more.

A cyanoacrylate adhesive composition having a toughening agent comprising poly(vinylidene-co-acrylonitrile) in combination with fumed silica. A useful amount of poly(vinylidene-co-acrylonitrile) is about 1.0% by weight to about 20.0% by weight fumed silica is usefully present in amounts of 1-10% by wt.

A process for enhancing the security of implantable surgical devices secured to bone tissue comprising implanting in bone tissue a surgical device with a biocompatible adhesive and/or sealant selected from the group consisting of: p1 (a) a material made from monomers of the formula:

A cyanoacrylate adhesive contains an added ester, the ester used being at least one partial and/or full ester of monobasic or polybasic aliphatic carboxylic acids containing 1 to 5 carbon atoms directly attached to one another and monohydric to pentahydric aliphatic alcohols containing 1 to 5 carbon atoms directly attached to one another, the number of carbon atoms directly attached to one another in the other aliphatic groups being at most three where one aliphatic group contains 4 or 5 carbon atoms.

Cyanoacrylate compositions which employ fumed silicas treated with polydimethylsiloxane or trialkoxyalkylsilane are stable and exhibit an unexpectedly high thixotropic ratio. Such compositions are useful in adhesive applications or, when stabilized so as to prevent polymerization in contact with moisture, in latent fingerprint developing applications.

A cyanoacrylate adhesive composition thickened by a copolymer or terpolymer resin capable of being dissolved or solvated by the cyanoacrylate monomer exhibits significantly improved peel strength. Storage stability is also enhanced. Preferred thickeners are acrylonitrile-butadiene-styrene terpolymers, methacrylate-butadiene-styrene terpolymers, and vinylidene chloride-acrylonitrile copolymers. Preferred monomers are methyl and ethyl cyanoacrylates.

This invention relates to a system for forming a composite from a cyanoacrylate composition and a filler within depressions, holes, cracks or spaces in a substrate. The system also allows for the placement of a cantilevered member in the filled depression, hole, crack or space in the substrate to support a load when the cyanoacrylate has cured.

Surface-conforming materials, such as sheets, ribbons, tapes or moldable material may be adhered to a wide variety of underwater target surfaces with a cyanoacrylate adhesive. The cyanoacrylate adhesive is evacuated from it container under water, applied to a surface of the surface-conforming material, and then the surface-conforming material is pressed against the target surface for a relatively short period of time. The method provides a method, for example, of attaching a plastic explosive to the hull of a ship entirely under water.

Objects may be bonded to target surfaces of a variety of materials, including rough surfaces, surfaces at temperatures down to -40.degree. F. and surfaces submerged under water, by securing a sheet of compliant material to the object, applying cyanoacylate to the exposed surface of compliant material and pressing the object against the target surface for a time sufficient to establish a cure of the cyanoacrylate adequate to support the object from the target surface.

Pastes of alpha-cyanoacrylic acid esters and insolluble fillers can be applied to surfaces submerged in water for securing thereto, in situ, a wide variety of metallic and non. metallic substances.