Abstract: According to the present invention, a resin composition can be provided, which comprises a solvent represented by general formula (1) and a polycarbonate resin containing a structural unit (a) represented by general formula (A) (provided that a polycarbonate homopolymer composed only of a structural unit represented by formula (i) is excluded). (In formula (1), Ra represents a hydrogen atom or the like; Rb represents an alkyl group having 1 to 20 carbon atoms which may have a substituent, or the like; Rc to Rf independently represent a hydrogen atom or the like; and n represents an integer of 1 to 10.) (In formula (A), R1 to R8 independently represent a hydrogen atom or the like; and X represents —O— or the like.

Abstract: Provided is a seal device, which can reliably prevent leakage of substances from a gap in a coupling portion for two flow paths while improving ease of operation at the time of coupling the two flow paths to each other and decoupling the two flow paths from each other. The seal device includes: a first flow path (16A) which allows substances to pass therethrough; a second flow path (16B) separably coupled to the first flow path (16A); a sealing member (52), which has elasticity, and is held in a gap in a coupling portion (15) between the first flow path (16A) and the second flow path (16B); and a movable member (30) that closes the gap in the coupling portion (15) by deforming the sealing member (52) when the first flow path (16A) and the second flow path (16B) are to be coupled to each other.

Abstract: According to the present invention, there can be provided a resin composition, comprising: a polycarbonate resin comprising a constituent unit represented by the following general formula (1): wherein R1 to R4 and R11 to R14 each independently hydrogen, fluorine, chlorine, bromine or iodine, etc., a represents an integer of 1 to 1,000, and X represents —S—, etc.; and a carbonate-based organic solvent, wherein the content of the polycarbonate resin in the resin composition is 0.05% to 50% by mass; the content of the carbonate-based organic solvent in the resin composition is 50% to 99.

Abstract: Provided is a polycarbonate resin having excellent solubility in low-boiling-point non-halogenated solvents and having a high glass transition temperature. The polycarbonate resin includes constituent units (A) represented by general formula (1) and constituent units (B) represented by general formula (2), the molar ratio of the constituent units (A) to the constituent units (B), A/B, being 45/55 to 95/5.