Rubycon Corporation

Arina Hayakawa

Toshihito Kanai

The present invention pertains to a thin-film polymer laminated capacitor having a structure in which a resin thin film layer and an internal electrode metal layer are alternately laminated. The resin thin film layer has a high molecular weight structure obtained through polymerization of a first monomer which is a polyfunctional monomer and a second monomer which is a monofunctional monomer. The first monomer and the second monomer satisfy at least one of conditions (a) and (b). (a) The HLB value Hof the second monomer is less than the HLB value Hof the first monomer. (b) By using the following manufacturing method (1), when a first polymer member formed by using only the first monomer as the monomer and a second polymer member formed by using only the second monomer as the monomer are manufactured, and the water absorption rate of each of the polymer members is measured after being left still at 40° C. for 40 hours at 95%-relative humidity, the water absorption rate of the second polymer member is lower than the water absorption rate of the first polymer member. Here, the manufacturing method (1) comprises; providing the first monomer or the second monomer as a test monomer, obtaining a mixture by mixing a photoinitiator at a proportion of 0.2±0.01 mol with respect to 100 mol of the test monomer, pouring the mixture in a round plate; and creating a disc shaped polymer member having a dimension of diameter 30 mm×depth 1 mm by irradiating, with UV, the mixture poured in the round plate in a nitrogen atmosphere at 120 W and from a distance of 250 mm until progress of polymerization stops.

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Ina, Japan

Arina Hayakawa