Patent

A cyanoacrylate-based adhesive composition comprises 55-92% by weight of a 2-cyanoacrylate ester, preferably the ethyl ester, from 40-30% by weight of a vinyl chloride/vinyl acetate copolymer and not more than 25% by weight of a plasticizer (the plasticizer may be omitted entirely). The copolymer is preferably a vinyl chloride/vinyl acetate/maleic acid terpolymer.

The disclosed compounds are adducts of imidazole or derivatives thereof and sulfur dioxide. The adducts are apparently of the Lewis acid - Lewis base type, and are useful as latent curing agents for epoxide resins. The adducts are prepared by interacting the imidazole and sulfur dioxide under anhydrous conditions. Equimolar imidazole-SO2 adducts can serve as a source of sulfur dioxide at room temperature.

The disclosed compounds are adducts of imidazole or derivatives thereof and sulfur dioxide. The adducts are apparently of the Lewis acid-Lewis base type, and are useful as latent curing agents for epoxide resins. The adducts are prepared by interacting the imidazole and sulfur dioxide under anhydrous conditions. Equimolar imidazole-SO2 adducts can serve as a source of sulfur dioxide at room temperature.

This invention relates to a process for curing polyepoxides. More particularly, this invention relates to a new process for curing polyepoxides, to novel curing agents used in the process, and to useful products obtained from the process.

The disclosed compounds are adducts of imidazole or derivatives thereof and sulfur dioxide. The adducts are apparently of the Lewis acid-Lewis base type, and are useful as latent curing agents for epoxide resins. The adducts are prepared by interacting the imidazole and sulfur dioxide under anhydrous conditions. Equimolar imidazole--SO.sub.2 adducts can serve as a source of sulfur dioxide at room temperature.

This invention relates to the reaction of organic substituted hydrazines with sulfur dioxide. In one specific aspect, it relates to a novel process for making organic substituted hydrazinium hydrazinesulfinates. In yet another aspect, it relates to the composition of matter produced thereby.

My invention relates to improvements in blowing agents for the manufacture of porous rubber and plastic articles. Foamed articles of plastics or rubber are prepared by various means including solution of nitrogen under high pressures and subsequent release of pressure. A simpler method is to incorporated in the rubber or plastic composition a suitable chemical agent which, on heating to vulcanization or molding temperatures, releases large quantities of gas and thus causes foaming of the composition.

An adhesive composition comprising monomeric methyl allyl methylenemalonate is useful for bonding together a wide range of materials.

A fast-setting .alpha.-cyanoacrylate-type adhesive composition having good storage stability comprising an .alpha.-cyanoacrylate and about 0.1 ppm or more of at least one macrocyclic polyether compound or an analogue thereof, such as 18-crown-6 or 15-crown-5.

A process for bonding a polyolefin, polyfluoroolefin, polyethylene terephthalate, polyacetal, nylon or plasticizer-rich soft polyvinyl chloride substrate to a like substrate or for bonding a polyolefin, polyfluoroolefin, polyethylene terephthalate, polyacetal, nylon or plasticizer-rich soft polyvinyl chloride substrates to another substrate which comprises applying to the surface of at least one of the substrates to be bonded together an adhesion promoter composition comprising 0.001-10 wt.