Layered constructions, such as those used in pressure sensitive adhesive constructions and release liner constructions, are disclosed having a functional layer that is capable of removal. Methods of utilizing the layered constructions are also disclosed.

Self-immolative polymers and compositions comprising such polymers are described. The polymers are copolymers of phthalaldehyde and one or more additional aldehydes and can degrade/decompose upon exposure to a desired stimulus, like light, heat, sound, or chemical trigger. The copolymers can be linear or cyclic, and can be crosslinked or uncrosslinked. Polymer compositions, including multilayered and multiregioned compositions, containing the copolymers are disclosed. These compositions can contain agents such as crosslinking agents, crosslinking catalysts, photocatalysts, theremocatalyts, sensitizers, chemical amplifiers, freezing point depressing agent, photo-response delaying agents, and the like. Methods of making and using the copolymers are also described.

A polyacetal resin composition which is suppressed low in formaldehyde generation, while having high stiffness and high toughness. The resin is produced by a method including blending from 0.1 part by weight to 2 parts by weight (inclusive) of a polyacetal copolymer having a branched or crosslinked structure, which is a copolymer of a trioxane, a compound having from 3 to 4 (inclusive) cyclic ether units in each molecule and a compound having one cyclic ether unit in each molecule, per 100 parts by weight of a linear polyacetal copolymer which contains an oxymethylene unit as a main constituent, while containing, as a comonomer unit, an oxyalkylene unit at a ratio of from 0.4% by mole to 0.9% by mole (inclusive) relative to the constituents of the linear polyacetal copolymer, the linear polyacetal copolymer being obtained by copolymerization wherein a heteropolyacid or the like is used as a polymerization catalyst.

A battery includes a battery cell including a positive electrode plate and a negative electrode plate. At least one of the positive electrode plate or the negative electrode plate includes a polymer that includes an aldehyde ketone polymer. The aldehyde ketone polymer has a slope K of an elastic modulus G-loss modulus G curve that is measured by subjecting a sheet-like structure formed of the aldehyde ketone polymer to dynamic frequency scanning tests at (Tm+20) C., and 0.8K<, where Tm C. represents the melting temperature of the aldehyde ketone polymer.