Polymer Additives

Alpha-cyanoacrylate adhesive compositions each of which comprise a alpha-cyanoacrylic ester and a diacrylic ester compound or dimethacrylic ester compound which is added to the former ester and adhesives prepared from said composiiton having very excellent heat-resisitance.

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.

An adhesive composition (I) comprises up to 50 wt.% monomeric 2-alkoxy-alkyl-2-cyanoacrylate and 1-15 wt.% poly(1-5C) alkyl(meth)acrylate having an average mol. wt. of 10,000-60,000. An adhesive composition (I) comprises(with respect to components (A)-(C)): (a) up to 50 wt.% monomeric 2-alkoxy-alkyl-2-cyanoacrylate; (b) 1-15 wt.% poly(1-5C) alkyl(meth)acrylate having an average mol. wt. of 10,000-60,000; (c) 0-10 wt.% hydrophobic pyrogenic silicic acid; (d) 50-10,000 ppm polymerization stabilizer and; (e) 200-10,000 ppm accelerator.

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.

The mechanical properties of the adhesively bonded joints with ethyl-2-cyanoacrylate and ethyl-2-cyanoacrylate modified with poly(methylmethacrylate) were determined. The modifier lowers tensile stiffness, increases deformability and relaxation of the adhesive bond and improves impact resistance. A morphological structure similar to an interpenetrating network system is suggested which arises from the rapid polymerization of the solvent. The results obtained may be helpful for the design of joints with cyanoacrylate bonding.