1988

Crosslinked polymers which are produced from monomers containing glycerol carbonate groups, crosslinking monomers and, where appropriate, other monoethylenically unsaturated monomers are composed of principally spherical porous particles and are very suitable as carrier materials for the immobilization of biologically active substances.

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.

The influence of type and size of filler particles and viscosity of the cyanoacrylate component on the volume resistivity, conductivity mechanism and adhesive strength of the resultant bond has been investigated. Various carbon and metal fillers were used to make conductive cyanoacrylate adhesive compositions and the best results were obtained when Ag, Ni or Mo powders (5–10 μm) were incorporated in thickened ethyl 2-cyanoacrylate with a viscosity of 50–100 cP

The introduction of high molecular weight poly(methyl methacrylate) or poly(butadiene-co-acrylonitrile) into ethyl 2-cyanoacrylate produced viscous adhesives with a homogeneous or heterogeneous structure after cure. Steel joints bonded with these adhesives are shown to have improved tensile shear strength, deformability and stress relaxation of bonds compared with pure cyanoacrylate adhesive. Poly(methyl methacrylate)-modified adhesive is recommended for static load-bearing joints while poly(butadiene-co-acrylonitrile)-modified adhesive is more suited to cyclic or vibrating loads.

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.

Instant adhesives (cyanoacrylate adhesives ) are one-part solvent-free adhesives that cure immediately at room temperature and offer strong bonding strength. Instant adhesive was first developed in 1949 by Alan E. Ardis at Goodrich Company in the U.S., and was later developed into a product by F. B. Joyner and G. F. Hawkins at Eastman Company and marketed as Eastman 910 in 1959. Since then, various adhesive manufacturers around the world have improved and modified methods of synthesizing the main components, monomer.

The effects of substituents at the alpha-carbon atom on the donor properties of primary amines and amino alcohols have been studied. Such substituted amino species have important applications in industrially relevant gas separation processes. Qualitative molecular orbital arguments, along with detailed calculations at the MNDO level of theory, show that upon methyl substitution at the alpha-carbon atom the interaction of the methyl group properties of the amino species. Infrared spectroscopic data supporting the calculations are also described.

This invention relates to an electrically conductive powder for mixing with cyanoacrylates, and an electrically conductive composition containing this powder and one or more cyanoacrylates as basic components.