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: A polymerizable composition, suitable for use as an adhesive, sealant or coating, comprising a urethane-acrylate-capped prepolymer based on a graft polyol derived from the reaction between the polyol and a vinyl monomer or polymer. In a preferred embodiment, the graft polyol is present as the disperse phase of a polymer/polyol dispersion. The composition provides improved general properties, particularly cure-through-gap and impact properties. The composition typically has a relatively low viscosity, making it especially useful for "retaining" purposes. A process for preparing the composition and a process for using it are also disclosed.

Abstract: An anti-drip caulking device is provided having a "floating" anti-kickback dog which engages the plunger shaft. When the forward motion of the shaft is stopped, the floating action permits recoil of the plunger and dog until a tension spring is sufficiently stretched to balance the recoil force, or until a mechanical stop is engaged. The floating feature is provided by a tension and compression spring acting in opposition.

Abstract: An initiator, particularly useful for anaerobic compositions and replacing the commonly used hydroperoxides, having the formula ##STR1## In a preferred embodiment, R is a lower alkyl group, and R' is hydrogen and Q is a hydroxyl group.

Abstract: There is provided a curable anaerobic pressure sensitive adhesive composition, a mixture of a curable anaerobic system and a high molecular weight polymer system. The mixture which may include a tackifier and other functional additives constitutes a pressure sensitive adhesive and exhibits elastomeric properties. There is also provided in the composition an initiator system necessary to permit curing of the anaerobic pressure sensitive composition upon activation by the exclusion of oxygen. One or more accelerators for cure may also be provided.In one embodiment a component of the catalyst system may be either absent and provided later or latently present in microspheres which upon rupture will enhance the curing operation.

Abstract: A curable composition based on bisphenol-A derivatives or compositions corresponding to the formula ##EQU1## ("R" groups as defined herein) in combination with a free radical initiator and a bismaleimide- or nadic-type additive. These compositions have improved strength properties at elevated temperatures and improved resistance to thermal degradation.Also disclosed is a process for sealing or adhering surfaces by use of these compositions.

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: Porous articles impregnated with certain anaerobic polymerizable sealants and having a coating of such sealant on their surface can have such coating removed by dissolving the sealant in an aqueous solution of a surfactant having the general formula X.sup.1 --O(C.sub.2 H.sub.4 O).sub.x X.sup.2. The removal can be done at room temperature.

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.