Abstract: There is provided a die for extrusion in which an undesired reaction is suppressed in an inside thereof and with which variation in thickness of a resin sheet to be obtained can be reduced. A die for extrusion of the present invention includes: a cylindrical inflow port into which a molten resin flows; a manifold connected to the inflow port; a first slit connected to the manifold; a second slit connected to the first slit; and a lip land connected to the second slit. In the die for extrusion, the shape of a flow path is optimized based on a relationship among a position in the die, an operation time, and a vulcanization degree.

Abstract: The present invention provides an apparatus for manufacturing a plastic optical fiber suitable for adjusting a plastic optical fiber to be uniform in size while inhibiting the entry of a metal that causes an increase in transmission loss of the plastic optical fiber. The apparatus for manufacturing a plastic optical fiber of the present invention is provided with an extruding device and a gear pump. The extruding device has a containing portion that contains a resin composition, and introduces a gas into the containing portion to extrude the resin composition from the containing portion by means of the gas. The gear pump adjusts a flow rate of the resin composition extruded from the extruding device.

Abstract: There is provided a die for extrusion in which an undesired reaction is suppressed in an inside thereof and with which variation in thickness of a resin sheet to be obtained can be reduced. A die for extrusion of the present invention includes: a cylindrical inflow port into which a molten resin flows; a manifold connected to the inflow port; a first slit connected to the manifold; a second slit connected to the first slit; and a lip land connected to the second slit. In the die for extrusion, the shape of a flow path is optimized based on a relationship among a position in the die, an operation time, and a vulcanization degree.

Abstract: Provided is a protective sheet for glasses, which has excellent workability, visibility and transparency. A protective sheet for glasses, characterized by having a distinctness of image of 70% or more and an internal haze of 3.0% or less as measured in accordance with JIS K7136.

Abstract: Provided is a protective sheet for glasses, which has excellent workability, adhesion reliability, visibility and impact resistance. A protective sheet for glasses, characterized by having a scratched area ratio of 0.15% or less as measured in an impact resistance test, a tensile elastic modulus of 50 MPa to 3500 MPa as measured in accordance with JIS K7124, a bending strength of 2.0×107 to 5.5×1010 ?m3·MPa, a distinctness of image of 70% or more, and a thickness of 45 to 250 ?m.

Abstract: Provided is a pressure-sensitive adhesive sheet having good unwinding property from a roll body or the like and excellent antistatic property, and suitable for a surface protective film or the like. A pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet including a back surface layer (A), a backing layer (B), and a pressure-sensitive adhesive layer (C), the back surface layer (A) and the pressure-sensitive adhesive layer (C) being outermost layers. The back surface layer (A) has a peel strength of 0.1 to 3.5 N/20 mm, and the back surface layer (A) has a surface resistance value of less than 1×1014?/?.

Abstract: Provided is a pressure-sensitive adhesive sheet having good unwinding property from a roll body or the like and excellent antistatic property, and suitable for a surface protective film or the like. A pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet including a back surface layer (A), a backing layer (B), and a pressure-sensitive adhesive layer (C), the back surface layer (A) and the pressure-sensitive adhesive layer (C) being outermost layers. The pressure-sensitive adhesive sheet has a 10-m/min unwinding force of 0.6 N/20 mm or less, and the back surface layer (A) has a surface resistance value of less than 1×1014?/?.

Abstract: Provided is a pressure-sensitive adhesive sheet having good unwinding property from a roll body or the like and excellent antistatic property, and suitable for a surface protective film or the like. A pressure-sensitive adhesive sheet of the present invention is a pressure-sensitive adhesive sheet including a back surface layer (A), a backing layer (B), and a pressure-sensitive adhesive layer (C), the back surface layer (A) and the pressure-sensitive adhesive layer (C) being outermost layers. The back surface layer (A) contains a block polymer formed of a block of a polyolefin and a block of a hydrophilic polymer at a content of 7 to 50 wt %, and the back surface layer (A) contains a releasing agent at a content of 2 to 20 wt %.