The present disclosure discloses a low-water-vapor-permeability polyolefin-elastomer film and its preparation method. The film comprises: 50-100 mass parts of a matrix resin, 0-40 mass parts of a modified resin, 0.001-2 mass parts of an activator, 0.1-3 mass parts of an organic peroxide, 0.02-5 mass parts of an assistant cross-linker, 0.02-2 mass parts of a silane coupling agent, 0.005-2 mass parts of a light stabilizer, and 0-20 mass parts of a water blocking filler. In the present disclosure, by adding the modified resin and the activator that have an active group, a cross-linking degree and a cross-linking density of the film are improved, and a water-vapor permeability is reduced; by adding the water blocking filler, the water blocking property of the film is further improved, thereby ensuring reliability of the assembly, and prolonging service life of the assembly.

The present invention relates to a biodegradable PLA filament composition for molding a porous structure. The biodegradable PLA filament composition for molding a porous structure according to one embodiment of the present invention includes polylactic acid (PLA) in 50% by weight to 60% by weight; polybutylene succinate (PBS) in 20% by weight to 30% by weight; polybutylene adipate terephthalate (PBAT) in 7% by weight to 9% by weight; an additive in 0.1% by weight to 1% by weight; a crystallization nucleating agent in 0.1% by weight to 1% by weight; a natural grapefruit seed powder (Jamongci_genu pectin type) in 0.1% by weight to 2% by weight; an inorganic filler in 1% by weight to 10% by weight; and a crosslinking agent in 0.001% by weight to 10% by weight.

The adhesive tape of the present disclosure includes: a substrate; and an adhesive layer disposed on one surface of the substrate. In the adhesive tape of the present disclosure, when a breakdown voltage in a thickness direction of the adhesive tape is represented as X (unit: kV) and an initial elastic modulus evaluated from a stress-strain curve in a tensile test is represented as Y (unit: N/mm), an inequality Y ≤ 4.5X -22.5 is satisfied. The adhesive tape of the present disclosure has an excellent balance between insulating properties and winding properties in winding work.

The adhesive tape of the present disclosure includes: a substrate; and an adhesive layer disposed on one surface of the substrate. In the adhesive tape of the present disclosure, when a breakdown voltage in a thickness direction of the adhesive tape is represented as X (unit: kV) and an initial elastic modulus evaluated from a stress-strain curve in a tensile test is represented as Y (unit: N/mm), an inequality Y ≤ 4.5X -22.5 is satisfied. The adhesive tape of the present disclosure has an excellent balance between insulating properties and winding properties in winding work.

An object of the present invention is to provide a golf ball having a decreased spin rate on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) two or more α,β-unsaturated carboxylic acids having 3 to 14 carbon atoms and having no substituent group at a carbon atom bonding to the carboxy group, and/or a metal salt thereof, and (c) a crosslinking initiator.

An object of the present invention is to provide a golf ball having a decreased spin rate on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) a base rubber, (b) two or more α,β-unsaturated carboxylic acids having 3 to 14 carbon atoms and having no substituent group at a carbon atom bonding to the carboxy group, and/or a metal salt thereof, and (c) a crosslinking initiator.

A method for forming a golf ball with a graphene core disclosed herein. The method includes mixing a graphene masterbatch material with a polybutadiene material to form a core mixture, wherein the graphene masterbatch material comprises graphene in an amount from 0.1 to 80.0 weight percent of the graphene masterbatch material mixed with a carrier polymer in an amount from 99.9 to 20 weight percent of the graphene masterbatch material.

A method for forming a golf ball with a graphene core disclosed herein. The method includes mixing a graphene masterbatch material with a polybutadiene material to form a core mixture, wherein the graphene masterbatch material comprises graphene in an amount from 0.1 to 80.0 weight percent of the graphene masterbatch material mixed with a carrier polymer in an amount from 99.9 to 20 weight percent of the graphene masterbatch material.

A method for forming a golf ball with a graphene core disclosed herein. The method includes mixing a graphene masterbatch material with a polybutadiene material to form a core mixture, wherein the graphene masterbatch material comprises graphene in an amount from 0.1 to 80.0 weight percent of the graphene masterbatch material mixed with a carrier polymer in an amount from 99.9 to 20 weight percent of the graphene masterbatch material.

A perfluorodiacyl peroxide represented by the following formula (1):
(C.sub.5F.sub.11COO).sub.2   (1).
Also disclosed is a solution containing the perfluorodiacyl peroxide, a polymerization initiator containing the perfluorodiacyl peroxide, a method for producing a polymer which includes polymerizing a radically polymerizable monomer with the perfluorodiacyl peroxide, and a perfluoroacyl chloride represent by the following formula (2):
C.sub.5F.sub.11COCl (2).