Abstract: A composition of matter which is useful in a process for impregnating and sealing of porous articles, the composition comprising:(a) an azonitrile;(b) a polymerizable acrylic monomer;(c) a substituted, sterically-hindered phenol; and(d) a metal ion chelator.

Abstract: A flexible adhesive tape comprising a thermoplastic support film etched on one side with a suitable etchant or etching method, said etched side being coated with a polyvinylformal pre-coat, and further coated with a photo-sensitive adhesive composition comprising,(i) at least one polymerizable acrylate ester monomer;(ii) a photo-initiator;(iii) optionally a film former;and the other side of said thermoplastic support film being coated with a release agent.These tape are useful as protective coatings, and adhere to a variety of surfaces, particularly high surface energy materials.

Abstract: A preapplied, non-migratory, anti-galling composition, capable of retaining excellent lubricating properties up to temperatures of about 1200.degree. F. for an extended period of time, comprising an aqueous dispersion of graphite powder or metal powder, or both, in a polymeric binder. The composition is especially useful for providing a lubricating agent for metallic threaded objects to be subjected to high temperatures.

Abstract: A polymerizable adhesive and sealant composition comprising a urethane-acrylate-capped prepolymer based on a polybutadiene polyol or polyamine having at least about 70 percent of the butadiene units in the 1,4-configuration. The composition provides improved thermal, impact and cure-through-gap properties. A process for preparing the composition and a process for using it are also disclosed.

Abstract: Curable acrylate ester compositions having as an accelerator for the polymerization a hydrazine derivative of the formula R.sup.1 --HN--NH--CO--R.sup.2. Typical of the monomers are the polyalkylene-glycol dimethacrylates and the so-called urethane acrylates. Polymerization is preferably initiated by a peroxy compound such as cumene hydroperoxide, such a composition having anaerobic curing characteristics.

Abstract: Polymerizable anaerobic compositions can be made more stable and capable of greater speed of cure by removing from the composition at least a substantial portion of the metal contamination.

Abstract: Anaerobic compositions containing strong acid impurities and/or strong acid precursors are neutralized and stabilized against the degrading effects of pH decrease during storage by adding about 0.1 to about 10 percent by weight of the total composition of an epoxy.

Abstract: An improved dental filling material is prepared from polymerizable urethane-acrylate resins which cure by a free-radical mechanism to form hard and durable filling compositions which bond strongly and adhesively to tooth enamel, to dentin, to dental prostheses and to preexisting dental filling materials.

Abstract: A curable system such as a curable adhesive type system having a relatively long pot life is disclosed. The curable system of the present invention comprises polymer containing material including at least one curable epoxy resin, at least one imidazole type catalytic curing agent for the resin and a solvent for the epoxy resin capable of suppressing or inhibiting the catalytic reaction between the resin and curing agent at least at about room temperature, the solvent being selected from methanol, ethanol and mixtures thereof.

Abstract: A process for producing metallocenes encapsulated by a urea-formaldehyde polymer shell. The presence of a small amount of a cationic surfactant, preferably an alkyl hydroxy amine, is required during the condensation polymerization which forms the shell.

Abstract: A self-emulsifying anaerobic-curing composition is disclosed. The composition is rendered self-emulsifying by incorporating certain anionic and/or nonionic surfactants in a concentration range of about 0.25 to about 10.0 percent. The preferred anionics comprise the petroleum sulfonates and the sodium alkyl or alkylaryl sulfonates. The preferred nonionics comprise the ethoxylated alkyl alcohols, the ethoxylated alkyl phenols, and the polyoxyethylene/polyoxypropylene glycols. Any anaerobic monomer or monomer mixture in which the surfactant is soluble and compatible with the cure system may be used.These self-emulsifiable compositions have the advantage of being readily removed from surfaces by washing with water, which makes them especially useful in impregnation processes where uncured resin must be removed from areas which are difficult to wash, such as small, blind holes.

Abstract: This invention relates to polymerizable compositions, which serve as adhesives, sealants, potting compounds, etc., the primary components of which are an acyl peroxide initiator, an arylamine polymerization accelerator, and a polymerizable acrylate-isocyanate monomer.

Abstract: Stable cyanoacrylate adhesive compositions having viscosities greater than about 200 centipoise are prepared by incorporating therein, as a thickening agent, a soluble acrylic polymer having a reduced viscosity of about 5 or greater, and a content of free radical polymerization initiator less than 1% by weight. These properties are obtained by subjecting the thickening agent to temperatures of about 140.degree.-180.degree. C. for about 30-180 minutes prior to incorporating it in the cyanoacrylate.

Abstract: This invention concerns anaerobic compositions which contain acrylate ester monomers, peroxy polymerization initiators, a substituted thiourea, and an acidic substance and which exhibit improved ability to cure through relatively large gaps.

Abstract: A process for repairing dental caries which comprises:A. Removing decayed tooth structure to form a dental cavity;B. Filling said cavity with a dental filling composition comprising1. A free-radical polymerizable acrylate monomer;2. A free radical polymerization initiator; and3. An inorganic filler;C. Applying an aqueous solution of waterglass to the surface of the composition and allowing the water to evaporate to leave a solid, essentially oxygen-impermeable coating of waterglass;D. Permitting said composition to harden to form a restored dental surface; andE. Washing off the waterglass coating with water.