Abstract: A method for property modification of bulk polymers, by initially treating a short chain monomeric organic acid, having a carboxylic group (with dissociation constant between 10.sup.-2 to 10.sup.-6 cm.sup.-1, and less than 8 carbons); with a Group IA, IIA or IIB metal, metal oxide, peroxide, hydroxide, or halogens, for forming a metal ligand or complex metal salt of the acid. The bulk polymers are mixed with the complex metal salts and free radicals are introduced into the mixture by means of oxidizing materials, to functionalize the bulk polymer with ionic polymerization sites. A copolymer formation is effected between the monomeric organic metal salt anion and the bulk polymer, as catalyzed by the metal cation, at such sites. The polymerization is a substantially non-cross linked ionic one resulting from the dissociation parameters and the short chain length of the complex metal salt, which is maintained prior to copolymer formation.

Abstract: A container defining an inner containment region and having means for positively sealing and opening at least one end to provide access to the containment region. An enclosure member is provided with at least one closure secured thereto for hinged movement adjacent to the opening, the closure being bi-directionally movable from a locked first position wherein the closure seals the container opening, through an intermediate position to a locked second position wherein the closure positively unseals the opening. The enclosure member resiliently deforms in coopertive interaction with the closure as the closure moves between the first and second positions, respectively, to aid further movement thereof from the intermediate position to either of the first locked closed positiion or the second locked open position. A method for manufacturing the container is also disclosed.