A recyclable, sealable packaging that has one or several polyamides, in a proportion greater than or equal to 90% by weight with respect to the total, and the sealing layer consists of one or several polyamides that are sealable at less than 200° C. is disclosed. The invention affords the main advantages of being recyclable after its use and having a sufficiently low melting temperature for it to seal with itself and with other polyamides.

The present disclosure relates to a composition that includes a first repeat unit that includes ##STR00001##
where x is between 1 and 1,000, inclusively, and R.sub.1 includes at least one of a first hydrocarbon chain and/or a first hydrocarbon ring. In some embodiments of the present disclosure, R.sub.1 may further include at least one of an oxygen atom, a nitrogen atom, a sulfur atom, and/or a phosphorus atom.

The present disclosure relates to a composition that includes a first repeat unit that includes ##STR00001##
where x is between 1 and 1,000, inclusively, and R.sub.1 includes at least one of a first hydrocarbon chain and/or a first hydrocarbon ring. In some embodiments of the present disclosure, R.sub.1 may further include at least one of an oxygen atom, a nitrogen atom, a sulfur atom, and/or a phosphorus atom.

Provided are a novel polyamide polymer obtained by polymerizing monomers including aromatic diamine substituted with a nitrile group and an amide group and an aromatic dibasic acid compound, a spinning dope comprising the same, and a polyamide molded article. A fiber obtained using the novel polyamide polymer according to the present invention, particularly, a fiber obtained by spinning the polymer according to the present invention may have high strength and high elasticity, such that the fiber may be applied to various industrial fields.

Provided are a novel polyamide polymer obtained by polymerizing monomers including aromatic diamine substituted with a nitrile group and an amide group and an aromatic dibasic acid compound, a spinning dope comprising the same, and a polyamide molded article. A fiber obtained using the novel polyamide polymer according to the present invention, particularly, a fiber obtained by spinning the polymer according to the present invention may have high strength and high elasticity, such that the fiber may be applied to various industrial fields.

A resin having a small linear thermal expansion coefficient and a low absorbance is provided. The resin is characterized by including at least one structure selected from structures represented by the following general formulae (1) and (2):

##STR00001##

Provided are a polyamide resin with a high melting point and a high glass transition temperature, a polyamide resin composition, and a molded article. The polyamide resin includes diamine-derived structural units and dicarboxylic acid-derived structural units, in which 50 mol % or more of the diamine-derived structural units are structural units derived from p-benzenediethanamine, and 65 mol % or more of the dicarboxylic acid-derived structural units are structural units derived from an aromatic dicarboxylic acid.

Provided are a polyamide resin with a high melting point and a high glass transition temperature, a polyamide resin composition, and a molded article. The polyamide resin includes diamine-derived structural units and dicarboxylic acid-derived structural units, in which 50 mol % or more of the diamine-derived structural units are structural units derived from p-benzenediethanamine, and 65 mol % or more of the dicarboxylic acid-derived structural units are structural units derived from an aromatic dicarboxylic acid.

The present invention relates to a composite semipermeable membrane including: a support membrane including a base and a porous support layer; and a separation functional layer disposed on the porous support layer and including a crosslinked aromatic polyamide, in which the separation functional layer contains sulfo groups in an amount of 7.0×10.sup.−5 to 5.0×10.sup.−2 g/m.sup.2 and includes a structure represented by the formula 1.

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.