Kao Corporation

Shotaro Shibata

Yutaka Yoshida

Yoshiaki Kumamoto

Motoi Konishi

Takuma Tsuboi

Shunsuke Fukui

Minato Nakamura

The invention relates to [1] a cellulose fiber composite excellent in dispersion stability, in which at least one amine selected from a polyamine and a monoamine having a reactive functional group bonds to anion-modified cellulose fibers, and which satisfies at least one of amine introduction ratio of 60% or less (requirement 1) and average polymerization degree of anion-modified cellulose fibers of 300 or less (requirement 2), [2] a dispersion in which the cellulose fiber composite is dispersed in a medium, [3] a resin composition produced by blending the cellulose fiber composite and a resin, [4] a molded article produced by molding the cellulose fiber composite or the resin composition, and [5] a method for producing the cellulose fiber composite.

Cellulose fiber composite

A rubber composition containing a rubber and modified cellulose fibers, wherein one or more substituents selected from substituents represented by the following general formulas (1) and (2): &#x2014;CH&#x2014;CH(OH)&#x2014;R(1), &#x2014;CH&#x2014;CH(OH)&#x2014;CH&#x2014;(OA)&#x2014;O&#x2014;R(2), wherein each Rin the general formulas (1) and (2) is independently a linear or branched alkyl group having 3 or more carbon atoms and 30 or less carbon atoms; n in the general formula (2) is a number of 0 or more and 50 or less; and A is a linear or branched, divalent saturated hydrocarbon group having 1 or more carbon atoms and 6 or less carbon atoms are bonded to cellulose fibers via an ether bond, wherein the modified cellulose fibers have a cellulose I crystal structure. The rubber composition of the present invention can be suitably used for machine tool parts, household electric appliance parts, automobile parts, and the like.

Rubber composition

Modified cellulose fibers, wherein each of (A) one or more substituents selected from substituents represented by the following general formula (1) and substituents represented by the following general formula (2): &#x2014;CH&#x2014;CH(OH)&#x2014;R(1); &#x2014;CH&#x2014;CH(OH)&#x2014;CH&#x2014;(OA)-O&#x2014;R(2), wherein each Rin the general formula (1) and the general formula (2) is independently a linear or branched alkyl group having 3 or more carbon atoms and 30 or less carbon atoms; n in the general formula (2) is a number of 0 or more and 50 or less; and A is a linear or branched, divalent saturated hydrocarbon group having 1 or more carbon atoms and 6 or less carbon atoms, and (B) a substituent represented by the following general formula (3): &#x2014;CH&#x2014;CH(OH)&#x2014;R(3), wherein Rin the general formula (3) is an alkyl group having 1 or more carbon atoms and 2 or less carbon atoms, is independently bonded to cellulose fibers via an ether bond, wherein the modified cellulose fibers have a cellulose I crystal structure. The resin composition blended with the modified cellulose fibers of the present invention can be suitably used in various industrial applications such as daily sundries, household electric appliance parts, wrapping materials for household electric appliance parts and automobile parts.

Modified cellulose fibers

A resin composition containing: (A) one or more resins selected from the group consisting of a thermoplastic resin, and a curable resin selected from an epoxy resin, a (meth)acrylic resin, a phenolic resin, an unsaturated polyester resin, a polyurethane resin, or a polyimide resin; and (B) modified cellulose fibers wherein one or more substituents selected from substituents represented by the following general formulas (1) and (2): &#x2014;CH&#x2014;CH(OH)&#x2014;R(1), &#x2014;CH&#x2014;CH(OH)&#x2014;CH&#x2014;(OA)-O&#x2014;R(2), wherein each Rin the general formulas (1) and (2) is independently a linear or branched alkyl group having 3 or more carbon atoms and 30 or less carbon atoms; n in the general formula (2) is a number of 0 or more and 50 or less; and A is a linear or branched, divalent saturated hydrocarbon group having 1 or more carbon atoms and 6 or less carbon atoms are bonded to cellulose fibers via an ether bond, wherein the modified cellulose fibers have a cellulose I crystal structure. The resin composition of the present invention can be suitably used in various applications such as daily sundries, household electric appliance parts, wrapping materials for household electric appliance parts, automobile parts, and resins for three-dimensional modeling.

Growing community of inventors

Wakayama, Japan

Shotaro Shibata