The present invention relates to novel polymer compositions and their use in polyolefin resins. Films and rigid or semi-rigid articles made from these novel polymer compositions provide improved oxygen and/or carbon dioxide barrier protections, optical appearance and/or mechanical properties.

A studless tire having a tread composed of a rubber composition for a tread comprising 1 to 20 parts by mass of a farnesene resin and 1 to 20 parts by mass of a terpene resin based on 100 parts by mass of a rubber component.

The present invention provides a photosensitive resin composition which has a light-blocking property, and at the same time, a high sensitivity, and has excellent half-tone characteristics. The present invention provides a photosensitive resin composition including an (A) alkali-soluble resin, a (B) radically polymerizable compound, a (C) photo initiator, and a (D) colorant, where the (A) alkali-soluble resin contains a polyimide, a polyimide precursor, a polybenzoxazole precursor, and/or a copolymer thereof, and the (B) radically polymerizable compound contains a (B-1) bifunctional or higher (meth)acrylic compound that has a glass transition temperature of 150 C. or higher as a homopolymer, and a (B-2) tetrafunctional or higher (meth)acrylic compound other than the (B-1).

The present invention provides a photosensitive resin composition which has a light-blocking property, and at the same time, a high sensitivity, and has excellent half-tone characteristics. The present invention provides a photosensitive resin composition including an (A) alkali-soluble resin, a (B) radically polymerizable compound, a (C) photo initiator, and a (D) colorant, where the (A) alkali-soluble resin contains a polyimide, a polyimide precursor, a polybenzoxazole precursor, and/or a copolymer thereof, and the (B) radically polymerizable compound contains a (B-1) bifunctional or higher (meth)acrylic compound that has a glass transition temperature of 150 C. or higher as a homopolymer, and a (B-2) tetrafunctional or higher (meth)acrylic compound other than the (B-1).

A method of manufacturing copper powder according to the present invention includes: a first step of reducing copper particles in water by using at least one compound selected from the group consisting of potassium borohydride, sodiumborohydride, and lithium borohydride; after the first step, a second step of washing with water; a third step of washing copper powder obtained in the second step with at least one compound selected from the group consisting of ether compounds and alcohol compounds; and a fourth step of bringing the copper powder obtained in the third step into contact with an organic acid solution, in which at least one compound selected from the group consisting of ether compounds and alcohol compounds is used as a solvent.

A method of manufacturing copper powder according to the present invention includes: a first step of reducing copper particles in water by using at least one compound selected from the group consisting of potassium borohydride, sodiumborohydride, and lithium borohydride; after the first step, a second step of washing with water; a third step of washing copper powder obtained in the second step with at least one compound selected from the group consisting of ether compounds and alcohol compounds; and a fourth step of bringing the copper powder obtained in the third step into contact with an organic acid solution, in which at least one compound selected from the group consisting of ether compounds and alcohol compounds is used as a solvent.

A method for preparing solid microcapsules by adding, with stirring, a composition C1, having at least one active ingredient, in a photocrosslinkable polymeric composition C2, to obtain an emulsion (E1), adding, with stirring of the emulsion (E1) in a composition C3, the viscosity of the composition C3 being greater than 2000 mPa.Math.s at 25 C., to obtain a double emulsion (E2), applying shear to the emulsion (E2), the applied shear rate being less than 1000 s.sup.1, to obtain a double emulsion (E3), and polymerizing by photopolymerization of the composition C2.

A method for preparing solid microcapsules by adding, with stirring, a composition C1, having at least one active ingredient, in a photocrosslinkable polymeric composition C2, to obtain an emulsion (E1), adding, with stirring of the emulsion (E1) in a composition C3, the viscosity of the composition C3 being greater than 2000 mPa.Math.s at 25 C., to obtain a double emulsion (E2), applying shear to the emulsion (E2), the applied shear rate being less than 1000 s.sup.1, to obtain a double emulsion (E3), and polymerizing by photopolymerization of the composition C2.

A metallic acrylate composition comprises a metallic acrylate and a dispersant, wherein the content of the dispersant is in the range from 0.1 weight percent to 5 weight percent based on the total weight of the metallic acrylate composition, and the metallic acrylate has the structure represented by Formula (I) or Formula (II) as follows:

##STR00001## wherein in Formula (I) and Formula (II), X is larger than 0 and less than 2, and M.sup.2+ is zinc ion (Zn.sup.2+), magnesium ion (Mg.sup.2+) or calcium ion (Ca.sup.2+); R1 is a hydrogen group or a saturated alkyl group; and R2 is

##STR00002##

and the dispersant is polytetrafluoroethylene (PTFE) wax or PTFE-modified polyethylene wax.

A metallic acrylate composition comprises a metallic acrylate and a dispersant, wherein the content of the dispersant is in the range from 0.1 weight percent to 5 weight percent based on the total weight of the metallic acrylate composition, and the metallic acrylate has the structure represented by Formula (I) or Formula (II) as follows:

##STR00001## wherein in Formula (I) and Formula (II), X is larger than 0 and less than 2, and M.sup.2+ is zinc ion (Zn.sup.2+), magnesium ion (Mg.sup.2+) or calcium ion (Ca.sup.2+); R1 is a hydrogen group or a saturated alkyl group; and R2 is

##STR00002##

and the dispersant is polytetrafluoroethylene (PTFE) wax or PTFE-modified polyethylene wax.