Biodegradable particles for delivering a nucleic acid encoding gene-editing factors or a nucleic acid associated with a therapeutic protein to a cell, and compositions, methods, systems, and kits for gene editing in vivo or ex vivo or gene therapy for treating retinal eye diseases are disclosed.

The present invention relates to a compression limiter made of a first thermoplastic composition comprising a semi-crystalline semi-aromatic polyamide. The invention further relates to a process for producing the compression limiter, and to an assembly comprising the compression limiter and a thermoplastic body made of a second thermoplastic polyamide composition. According to the invention, the compression limiter is made of a thermoplastic composition.

A fiber-reinforced resin composite sheet of the present invention contains: a polyamide resin film containing a dicarboxylic acid component (a) and a diamine component (b); and a plurality of reinforcing fibers laminated in a state of being oriented in the same direction on the polyamide resin film, the reinforcing fibers being obtained by opening a reinforcing fiber bundle. The dicarboxylic acid component (a) contains 60 mol % or more and 100 mol % or less of terephthalic acid. The diamine component (b) contains 60 mol % or more and 100 mol % or less of 1,9-nonanediamine and 2-methyl-1,8 octanediamine. The fiber-reinforced resin composite sheet has a volume content rate Vf of the reinforcing fibers of 20% or more and 70% or less and a thickness of 20 μm or more and 70 μm or less.

The present invention relates to a polymer film (P) containing a polyamide composition (PC) that comprises an amorphous polyamide (A) and a semicrystalline polyamide (B) and to a method for producing the polymer film (P). The present invention further relates to a method for packaging food products with the polymer film (P).

Provided is a polyamide resin having a high glass transition temperature and a low water absorption rate and from which a molded article that exhibits minimal deformation after water absorption is obtained. The polyamide resin includes diamine-derived structural units and dicarboxylic acid-derived structural units. More than 30 mol% of the diamine-derived structural units are derived from a diamine represented by the following formula, and more than 30 mol% of the dicarboxylic acid-derived structural units are derived from an aromatic dicarboxylic acid:

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Provided is a polyamide resin having a high glass transition temperature and a low water absorption rate and from which a molded article that exhibits minimal deformation after water absorption is obtained. The polyamide resin includes diamine-derived structural units and dicarboxylic acid-derived structural units. More than 30 mol% of the diamine-derived structural units are derived from a diamine represented by the following formula, and more than 30 mol% of the dicarboxylic acid-derived structural units are derived from an aromatic dicarboxylic acid:

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Provided is a polyamide resin having a low mass loss at a temperature slightly higher than the melting point. The polyamide resin includes diamine-derived structural units and dicarboxylic acid-derived structural units, and of the diamine-derived structural units, from 70 to 97 mol % are derived from p-benzenediethanamine and from 3 to 30 mol % are derived from a diamine represented by formula (1). 50 mol % or more of the dicarboxylic acid-derived structural units are derived from an aromatic dicarboxylic acid.

##STR00001##

Provided is a polyamide resin having a low mass loss at a temperature slightly higher than the melting point. The polyamide resin includes diamine-derived structural units and dicarboxylic acid-derived structural units, and of the diamine-derived structural units, from 70 to 97 mol % are derived from p-benzenediethanamine and from 3 to 30 mol % are derived from a diamine represented by formula (1). 50 mol % or more of the dicarboxylic acid-derived structural units are derived from an aromatic dicarboxylic acid.

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A continuous polymerization method for nylon. Polymerization starting materials comprise, in parts by mass, 5-60 parts of polymerization monomer dibasic acid and/or dibasic acid ester, 3-50 parts of diamine, and 10-90 parts of reactive dispersion medium polyamide. Polymerization steps comprise: continuously adding the polymerization starting materials into a material mixing device in proportion, so that the raw materials are mixed and reacted in the material mixing device to form a continuously conveyed melt, and reacting the evenly dispersed melt in a subsequent polymerization device until nylon is polymerized to reach a required molecular weight. The method is an efficient and environment-friendly polymerization method for nylon.

Provided are a polyamide resin having high crystallinity, a high glass transition temperature, and a low mass loss rate, and a polyamide resin composition and a molded article in which the polyamide resin is used. The polyamide resin includes a diamine-derived structural unit and a dicarboxylic acid-derived structural unit, in which 50 mol % or more of the diamine-derived structural units are structural unit derived from p-benzenediethanamine, and of the dicarboxylic acid-derived structural units, from not less than 20 mol % to less than 95 mol % are structural units derived from an aromatic dicarboxylic acid and from more than 5 mol % to not more than 80 mol % are structural units derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 15 carbons.