Abstract: Scorch safety and shelf-life of a heat-curable composition including a chlorine- or bromine-containing halopolymer such as chlorinated polyethylene; a 1,3-diaminopropane or salt thereof; a sulfur source; and an acid acceptor are improved by adding N-(cyclohexylthio)phthalimide and N-nitrosodiphenylamine to the composition.

Abstract: Normally solid heat-activatable thermoplastic adhesives having improved hot tack strength at heat-seal temperatures are composed essentially of copolymers of ethylene with acrylic acid or methacrylic acid having standard melt flow values from about 1 to about 3 dg/min., and are especially useful as heat-seal coating or layer on substrates for packaging.

Abstract: A manually operated sprayer for dispensing liquids from a container includes an improved, self-sealing outlet check valve having a resilient diaphragm convexed toward and in seating engagement with the dispensing orifice. The diaphragm is designed to flex out of engagement with the dispensing orifice when the pressure of the liquid in the pump chamber exceeds the engaging force of the diaphragm, thereby permitting the liquid in the pump chamber to flow out of the dispensing orifice in an atomized form.

Abstract: An improvement in a process for removing residual vinyl chloride monomer from an aqueous dispersion of a synthetic polymer wherein the dispersion is subjected to boiling conditions while being maintained in a vessel having a vapor space above the liquid level of the dispersion. In the improved process, the content of vinyl chloride monomer in the dispersion is continuously monitored by a boiling point suppression technique.

Abstract: A latex obtained by emulsion polymerizing (a) 50 to 95 parts by weight of vinylidene chloride; (b) 0.5 to 30 parts by weight of propylene; (c) 4.5 to 20 parts by weight of a comonomer such as methyl acrylate; and, optionally, (d) no more than 5 parts by weight of a polar comonomer such as acrylic acid. Such latices are eminently suited for use as coating compositions due to their superior low temperature heat-sealing properties and decreased blocking tendencies.

Abstract: Halopolymers, such as chlorinated polyethylene, are uniquely vulcanized by heating a curable mixture including the halopolymer and a 1,3-diaminopropane or salt thereof. A preferred mixture further includes an acid acceptor, such as calcium oxide or calcium hydroxide, and sulfur or a sulfur-containing compound.

Abstract: A crystallizable vinylidene chloride polymer powder is recovered from a latex obtained by emulsion polymerizing in sequence (a) a first monomer mixture comprising a predominant amount of vinylidene chloride and an ethylenically unsaturated comonomer which is copolymerizable therewith, such as acrylonitrile; (b) a minor amount of a polyfunctional monomer for providing graft sites on the product of (a); and (c) a second monomer mixture which is predominantly acrylonitrile, the amount of the second monomer mixture being in the range of about 10 to about 25 percent of the weight of the first monomer mixture. The so-formed solvent is admixed with an acrylic polymer and a suitable solvent and then spun into fibers having improved flame-retardancy.

Abstract: Foamed radiation-crosslinked high density polyethylenes having substantially closed cells and uniform structure are made from radiation-crosslinked high density polyethylene compositions comprising thermosensitive foaming agents by heating such compositions while excluding molecular oxygen from contact therewith during that heating and foaming step. Oxygen is excluded by providing an oxygen-free inert gas atmosphere or by submerging the foamable material beneath the surface of a body of liquid heat transfer medium during the heating and foaming step.