Ricoh Company, Ltd.

Tokyo University of Science Foundation

Tatsuki Yamaguchi

Takashi Okada

Soh Noguchi

Mitsunobu Morita

Satoshi Takahashi

Masahide Kobayashi

Takenori Suenaga

Satoshi Kojima

Masahiko Ishikawa

Ryota Inoue

Shinji Aoki

Yuichi Sato

Takao Hiraoka

Yoshihiro Moriya

Tatsuru Moritani

Shosuke Aoai

Masaru Ohgaki

Koji Arimitsu

Tadahiko Morinaga

A particulate poly(lactic-co-glycolic) acid (PLGA) is provided. The particulate PLGA comprises a poly(lactic-co-glycolic) acid (PLGA), and has an average volume-based panicle diameter of 80 nm or less and a relative span factor (R.S.F.) satisfying the following formula (1):0<.≤1.20  Formula (1)

Particulate poly(lactic-co-glycolic) acid, method for manufacturing particulate poly (lactic-co-glycolic) acid, and particulate poly(lactic-co-glycolic) acid manufacturing apparatus

Provided is a composition including: an acrylamide compound (A1) having a molecular weight of 150 or greater but 250 or less; and a multifunctional polymerizable compound (A2), wherein a content of the multifunctional polymerizable compound (A2) is 15% by mass or greater but 35% by mass or less.

Composition, artificial nail composition, nail decoration material, artificial nail, stored container, image forming apparatus, and image forming method

To provide an active-energy-ray-curable composition including a compound represented by General Formula (I) below: where in the General Formula (I), R is hydrogen or a methyl group; A is a structure expressed by one selected from the group consisting of Structural Formulas (II) to (VII) below, each of which may have a substituent such as an alkyl group or an alkoxy group, or both; j and k in the Structural Formulas (VI) and (VII) are an integer of 0 or more; X denotes a substituent including a heteroatom; n is an integer of 0 or more, m is an integer of 1 or more, and n+m is 3 or more, or n is an integer of 0 and m is an integer of 2; and wavy lines in the Structural Formulas (II) to (VII) each independently denote a bond with X or a (meth)acryloyl group (HC═CR—C(═O)—):

Active-energy-ray-curable composition, active-energy-ray-curable ink composition, active-energy-ray-curable inkjet ink composition, composition stored container, two-dimensional or three-dimensional image forming apparatus, two-dimensional or three-dimensional image forming method, cured material, and decorated article

An active energy ray curable composition contains an allophanate-bond-containing compound having an activatable group at exposure to active energy rays and a polyester resin having a polymerizable unsaturated bond.

Active energy ray curable composition, active energy ray curable ink composition, active energy ray curable inkjet ink composition, composition container, image forming device, image forming method, cured matter, and decorated matter

Provided is a composition including: an acrylamide compound represented by general formula (1) below; urethane (meth)acrylate having a SI value of 3 or less in a skin sensitization test; and a polymerization initiator having a molecular weight of 800 or greater, where in general formula (1), Rrepresents an alkyl group containing 1 through 6 carbon atoms, X represents an alkylene group containing 1 through 6 carbon atoms, and Y represents any one selected from the group consisting of general formula (2) below and general formula (3) below, where in general formula (2), Rrepresents an alkyl group containing 1 through 10 carbon atoms, and * represents a binding site with X above, where in general formula (3), Rrepresents an alkyl group containing 1 through 10 carbon atoms, and * represents a binding site with X above.

An active energy ray curable composition contains an acrylamide compound A1 represented by the following Chemical formula 1 or the following Chemical formula 2; 

Active energy ray curable composition, active energy ray curable ink, composition accommodating container, two or three dimensional image forming apparatus, two or three dimensional image forming method, cured matter, decorative matter, artificial nail composition, nail decorative material, and artificial nail

Provided is a composition including an acrylamide compound having a molecular weight of 150 or greater but 250 or less (A1), and a monomer having a cyclic structure represented by General Formula (3) below, or General Formula (4) below, or both (A2), where, in General Formulae (3) and (4), L is a single bond or a straight chain or branched alkylene group that has from 1 through 10 carbon atoms and may include an oxygen atom, a nitrogen atom, or a sulfur atom; A is a cyclic structure that has from 2 through 10 carbon atoms and may include an oxygen atom, a nitrogen atom, or a sulfur atom; Ris a hydrogen atom or a methyl group; and Rand Rare each a straight chain or branched alkyl group having from 1 through 10 carbon atoms.

Composition, cured product, storage container, image forming apparatus, and image forming method

Provided is a composition including: an acrylamide compound represented by general formula (1) in 20% by mass or greater but 50% by mass or less; a multifunctional monomer in 40% by mass or greater but 70% by mass or less; and a polymerization initiator, where in general formula (1), Rrepresents alkyl group containing 1 through 6 carbon atoms, X represents alkylene group containing 1 through 6 carbon atoms, and Y represents any one selected from the group consisting of general formula (2) below and general formula (3) below, where in general formula (2), Rrepresents alkyl group containing 1 through 10 carbon atoms, and * represents binding site with X above, where in general formula (3), Rrepresents alkyl group containing 1 through 10 carbon atoms, and * represents binding site with X above.

Provided is a composition including an acrylamide compound having a molecular weight of 150 or greater but 250 or less (A1), a polyfunctional polymerizable compound including an alkylene oxide group (A2), and a polyfunctional polymerizable compound (A3) different from the polyfunctional polymerizable compound (A2).

Provided is a composition including an acrylamide compound (A1) having a molecular weight of 150 or greater but 250 or less, and a trifunctional or higher polymerizable compound (A2), wherein an amount of the trifunctional or higher polymerizable compound (A2) is 1% by mass or greater but 30% by mass or less relative to a total amount of the composition.

A composition contains an acrylamide compound A1 having an ester structure and a polymerization initiator B1 having a molecular weight of 800 or more.

Composition, accommodating unit, image forming device, and image forming method

Provided is a toner including toner base particles and an external additive, wherein each of the toner base particles includes a binder resin, a release agent, and silica, an average abundance ratio (X) of the silica on a region adjacent to a surface of the toner base particle is from 70% through 90%, and a projected area average value S(180) per particle of the toner when the toner is heated to 180&#xb0; C. and a projected area average value S(30) per particle of the toner when the toner is 30&#xb0; C. satisfy Formula (1) below,1.4&#x2264;(180)/(30)&#x2264;1.7&#x2003;&#x2003;Formula (1).

Toner, toner stored unit, and image forming apparatus

Provided is a toner including at least: a binder resin; and a release agent, wherein in a transmission electron microscopic (TEM) image of a torn cross-section of the toner, the release agent has an acicular or filiform shape and an average aspect ratio of 31 or greater, and wherein a displacement amount of the toner when 250 micronewtons is applied to the toner in a microcompression test is 700 nm or less.

A toner includes a toner base particle including a binder resin; a release agent; and an inorganic fine particle, and an external additive. The inorganic fine particle is silica having an average abundance ratio at the surface of the toner base particle of from 70% to 90%. The toner base particle has a BET specific surface area of from 1.0 m/g to 2.5 m/g after the external additive is removed from the toner.

Toner, toner housing unit, and image forming apparatus

An electrostatic-image developing toner including at least a binder resin; a colorant; and a release agent, wherein an average circularity of particles having a particle diameter in a range of 0.79 times or more but less than 1.15 times as large as a most frequent diameter in a number particle size distribution of the toner is within a range of 1.010 times or more but less than 1.020 times as high as an average circularity of particles having a particle diameter of 1.15 times or more as large as the most frequent diameter.

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Kanagawa, Japan

Tatsuki Yamaguchi