A preparation method of separation membrane is provided. First, a polyimide composition including a dissolvable polyimide, a crosslinking agent and a solvent is provided. The dissolvable polyimide is represented by formula 1:

##STR00001## wherein B is a tetravalent organic group derived from a tetracarboxylic dianhydride containing aromatic group, A is a divalent organic group derived from a diamine containing aromatic group, A′ is a divalent organic group derived from a diamine containing aromatic group and carboxylic acid group, and 0.1≦X≦0.9. The crosslinking agent is an aziridine crosslinking agent, an isocyanate crosslinking agent, an epoxy crosslinking agent, a diamine crosslinking agent, or a triamine crosslinking agent. A crosslinking process is performed on the polyimide composition. The polyimide composition which has been subjected to the crosslinking process is coated on a substrate to form a polyimide membrane. A wet phase inversion process is performed on the polyimide membrane.

A preparation method of separation membrane is provided. First, a polyimide composition including a dissolvable polyimide, a crosslinking agent and a solvent is provided. The dissolvable polyimide is represented by formula 1:

##STR00001## wherein B is a tetravalent organic group derived from a tetracarboxylic dianhydride containing aromatic group, A is a divalent organic group derived from a diamine containing aromatic group, A′ is a divalent organic group derived from a diamine containing aromatic group and carboxylic acid group, and 0.1≦X≦0.9. The crosslinking agent is an aziridine crosslinking agent, an isocyanate crosslinking agent, an epoxy crosslinking agent, a diamine crosslinking agent, or a triamine crosslinking agent. A crosslinking process is performed on the polyimide composition. The polyimide composition which has been subjected to the crosslinking process is coated on a substrate to form a polyimide membrane. A wet phase inversion process is performed on the polyimide membrane.

A pressure-sensitive adhesive composition, which may have excellent durability under high temperature or humidity conditions and exhibit high close adhesion to optical films, thereby forming a pressure-sensitive adhesive having superior cuttability and re-workability, is provided. Also, a pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive capable of effectively inhibiting bending when applied to a thin substrate such as a very thin glass substrate, minimizing a time required to stabilize physical properties, and preventing a degradation of the secured physical properties in time, a pressure-sensitive adhesive optical member formed using such a pressure-sensitive adhesive composition, an optical laminate, and a display device are provided.

The present invention provides an adhesive film hardly suffering from fisheyes and deposition of dirt and dusts thereonto and having excellent mechanical strength and heat resistance as well as good adhesion properties, which can be suitably used as various surface protective films, etc. The present invention relates to an adhesive film comprising a polyester film and an adhesive layer formed on at least one surface of the polyester film, in which the adhesive layer comprises a resin having a glass transition point of not higher than 0° C., and an antistatic agent, and a thickness of the adhesive layer is not more than 10 μm.

The present invention relates to a carboxylic branched chain-cutting agent for a golf ball-covering ionomer resin, a golf ball coating composition, and a method for manufacturing a golf ball. The present invention can provide a coating composition containing within an appropriate range, a specific compound for use as a carboxylic branched chain-cutting agent for a golf ball-covering ionomer resin, and thus can provide a golf ball on which a bridge is formed between a golf ball covering resin and a coating resin. By providing the coating composition containing a specific composition for use as a carboxylic branched chain-cutting agent for a golf ball-covering ionomer resin, the present invention is appropriate for ensuring the physical properties of the golf ball, such as yellowing resistance, and workability, such as pot life, even eliminating an adhesion pretreatment step, thereby reducing side effects due to the existing pretreatment step while providing a golf ball having excellent physical properties.

The present invention relates to a carboxylic branched chain-cutting agent for a golf ball-covering ionomer resin, a golf ball coating composition, and a method for manufacturing a golf ball. The present invention can provide a coating composition containing within an appropriate range, a specific compound for use as a carboxylic branched chain-cutting agent for a golf ball-covering ionomer resin, and thus can provide a golf ball on which a bridge is formed between a golf ball covering resin and a coating resin. By providing the coating composition containing a specific composition for use as a carboxylic branched chain-cutting agent for a golf ball-covering ionomer resin, the present invention is appropriate for ensuring the physical properties of the golf ball, such as yellowing resistance, and workability, such as pot life, even eliminating an adhesion pretreatment step, thereby reducing side effects due to the existing pretreatment step while providing a golf ball having excellent physical properties.

A circular tire frame includes a resinous material including a polyamide-based thermoplastic elastomer and a caprolactam.

A circular tire frame includes a resinous material including a polyamide-based thermoplastic elastomer and a caprolactam.

A circular tire frame includes a resinous material including a polyamide-based thermoplastic elastomer and a caprolactam.

A preparation method of separation membrane is provided. First, a polyimide composition including a dissolvable polyimide, a crosslinking agent, and a solvent is provided. The dissolvable polyimide is represented by formula 1: ##STR00001## wherein B is a tetravalent organic group derived from a tetracarboxylic dianhydride containing aromatic group, A is a divalent organic group derived from a diamine containing aromatic group, A′ is a divalent organic group derived from a diamine containing aromatic group and carboxylic acid group, and 0.1≤X≤0.9. The crosslinking agent is an aziridine crosslinking agent, an isocyanate crosslinking agent, an epoxy crosslinking agent, a diamine crosslinking agent, or a triamine crosslinking agent. A crosslinking process is performed on the polyimide composition. The polyimide composition which has been subjected to the crosslinking process is coated on a substrate to form a polyimide membrane. A dry phase inversion process is performed on the polyimide membrane.