Abstract: A syringe barrel including a cylindrical main body including an injection section and an insertion section, in which the cylindrical main body includes a layered structure, and a surface roughness of an inner surface of the cylindrical main body is 4 nm to 25 nm in terms of arithmetic average roughness (Ra).

Abstract: The polyester resin according to the present invention is a polyester resin mainly including a diol structural unit and a dicarboxylic acid structural unit, wherein 10 to 84 mol % of the diol structural unit is a structural unit derived from ethylene glycol, 16 to 90 mol % of the diol structural unit is a structural unit derived from neopentyl glycol represented by a particular formula (i), and 50 to 100 mol % of the dicarboxylic acid structural unit is a structural unit derived from a naphthalenedicarboxylic acid. Further, the optical lens according to the present invention is obtained by molding the polyester resin. Furthermore, the optical lens system according to the present invention includes the optical lens and an additional optical lens.

Abstract: A polyester resin having a diol unit containing a unit derived from ethylene glycol and a unit derived from a diol represented by the following formula (I), and a dicarboxylic acid unit containing a unit derived from an aromatic dicarboxylic acid in an amount of 50 mol % or more; wherein the entire diol unit contains the unit derived from ethylene glycol in an amount of 40 to 99 mol %, and the unit derived from a diol represented by formula (I) in an amount of 1 to 60 mol %: wherein A represents an aromatic ring selected from the group consisting of benzene, naphthalene, anthracene, phenanthrene and pyrene; R1 represents a C1 to C12 alkyl group, a substituted or unsubstituted C6 to C12 aryl group or a halogen atom; n represents an integer of 0 to 4; and when plural R1 are present, R1 may be the same as or different from each other.

Abstract: A method of producing a polyester resin comprising a dicarboxylate constitutional unit and a diol constitutional unit, the diol constitutional unit comprising a constitutional unit having a cyclic acetal skeleton, the method comprising reacting a diol (A) having a cyclic acetal skeleton, a bisalkyl dicarboxylate ester (B), and a diol (C) having no cyclic acetal skeleton in the presence of a basic compound (D).

Abstract: The present invention relates to a polyester resin including a diol constitutional unit and a dicarboxylic acid constitutional unit as main constitutional units, in which the diol constitutional unit contains from 70 to 95% by mol of a constitutional unit derived from ethylene glycol and from 5 to 30% by mol of a constitutional unit derived from tricyclodecane dimethanol or pentacyclopentadecane dimethanol, and the dicarboxylic acid constitutional unit contains 50% by mol or more of a constitutional unit derived from a naphthalenedicarboxylic acid, and an optical lens obtained by molding the polyester resin. According to the present invention, there are provided a polyester resin that has a high refractive index and a low Abbe number and can be molded into a good optical lens, and an optical lens obtained by molding the polyester resin.

Abstract: Disclosed is a glycol compound which is useful as a raw material and an intermediate for synthetic resins, additives for synthetic resins, medicines, cosmetics, food additives, surfactants and the like, further disclosed is a method for producing the compound. The glycol compound is represented by the following Formula (1): wherein R represents an alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 10 carbon atoms or a halogen atom; n represents an integer of 1 to 4; and when n represents an integer of 2 to 4, plural R may be the same or different from each other.

Abstract: Disclosed is a glycol compound which is useful as a raw material and an intermediate for synthetic resins, additives for synthetic resins, medicines, cosmetics, food additives, surfactants and the like, further disclosed is a method for producing the compound. The above glycol compound is represented by the following Formula (1): wherein A represents a divalent linkage group comprising a condensed aromatic ring selected from the group consisting of naphthalene, anthracene, phenanthrene and pyrene; R represents an alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 10 carbon atoms or a halogen atom; n represents an integer of 0 to 4; and when n represents an integer of 2 to 4, plural R may be the same or different from each other.

Abstract: A polyester resin having a diol unit containing a unit derived from ethylene glycol and a unit derived from a diol represented by the following formula (I), and a dicarboxylic acid unit containing a unit derived from an aromatic dicarboxylic acid in an amount of 50 mol % or more; wherein the entire diol unit contains the unit derived from ethylene glycol in an amount of 40 to 99 mol %, and the unit derived from a diol represented by formula (I) in an amount of 1 to 60 mol %: wherein A represents an aromatic ring selected from the group consisting of benzene, naphthalene, anthracene, phenanthrene and pyrene; R1 represents a C1 to C12 alkyl group, a substituted or unsubstituted C6 to C12 aryl group or a halogen atom; n represents an integer of 0 to 4; and when plural R1s are present, R1s may be the same as or different from each other.

Abstract: A polyester resin having a diol unit containing a unit derived from ethylene glycol and a unit derived from a diol represented by the following formula (I), and a dicarboxylic acid unit containing a unit derived from an aromatic dicarboxylic acid in an amount of 50 mol % or more; wherein the entire diol unit contains the unit derived from ethylene glycol in an amount of 40 to 99 mol %, and the unit derived from a diol represented by formula (I) in an amount of 1 to 60 mol %: wherein A represents an aromatic ring selected from the group consisting of benzene, naphthalene, anthracene, phenanthrene and pyrene; R1 represents a C1 to C12 alkyl group, a substituted or unsubstituted C6 to C12 aryl group or a halogen atom; n represents an integer of 0 to 4; and when plural R1s are present, R1s may be the same as or different from each other.

Abstract: The present invention relates to a polyester resin including a diol constitutional unit and a dicarboxylic acid constitutional unit as main constitutional units, in which the diol constitutional unit contains from 70 to 95% by mol of a constitutional unit derived from ethylene glycol and from 5 to 30% by mol of a constitutional unit derived from tricyclodecane dimethanol or pentacyclopentadecane dimethanol, and the dicarboxylic acid constitutional unit contains 50% by mol or more of a constitutional unit derived from a naphthalenedicarboxylic acid, and an optical lens obtained by molding the polyester resin. According to the present invention, there are provided a polyester resin that has a high refractive index and a low Abbe number and can be molded into a good optical lens, and an optical lens obtained by molding the polyester resin.

Abstract: Vibration damping film comprising a composition obtained by dispersing titanium dioxide (Y) and mica flakes (Z) in a polyester resin (X) comprising dicarboxylic acid units and diol units, satisfying conditions (I) to (III), and having a thickness in the range of 20 to 200 ?m : (I) Content of polyester resin (X), titanium dioxide (Y) and mica flakes (Z) in the composition is in the range of 35 to 60% by mass, in the range of 5 to 15% by mass and in the range of 30 to 55% by mass, respectively, (II) Average particle diameter of the mica flakes (Z) in the resin composition is in the range of 5 to 80 ?m, and (III) Elongation at failure point of the resin composition measured according to JIS K7127 is in the range of 30 to 70%.

Abstract: A resin composition for a vibration damping material, comprising a polyester resin mainly formed of a dicarboxylic acid constitutional unit and a diol constitutional unit; and a filler, in which the polyester resin contains: a dicarboxylic acid constitutional unit (A) mainly derived from an aromatic dicarboxylic acid, in particular, isophthalic acid; a diol constitutional unit (B) mainly derived from ethylene glycol; and a constitutional unit (C) formed of an aliphatic dicarboxylic acid, an aliphatic diol, and/or an aliphatic hydroxycarboxylic acid each having 5 or more carbon atoms, and the resin composition contains, as the filler, a flake-like or plate-like filler (D) and a filler (E) made of a particulate metal oxide.

Abstract: A polyester resin having a diol unit containing a unit derived from ethylene glycol and a unit derived from a diol represented by the following formula (I), and a dicarboxylic acid unit containing a unit derived from an aromatic dicarboxylic acid in an amount of 50 mol % or more; wherein the entire diol unit contains the unit derived from ethylene glycol in an amount of 40 to 99 mol %, and the unit derived from a diol represented by formula (I) in an amount of 1 to 60 mol %: wherein A represents an aromatic ring selected from the group consisting of benzene, naphthalene, anthracene, phenanthrene and pyrene; R1 represents a C1 to C12 alkyl group, a substituted or unsubstituted C6 to C12 aryl group or a halogen atom; n represents an integer of 0 to 4; and when plural R1s are present, R1s may be the same as or different from each other.

Abstract: Vibration damping film comprising a composition obtained by dispersing titanium dioxide (Y) and mica flakes (Z) in a polyester resin (X) comprising dicarboxylic acid units and diol units, satisfying conditions (I) to (III), and having a thickness in the range of 20 to 200 ?m : (I) Content of polyester resin (X), titanium dioxide (Y) and mica flakes (Z) in the composition is in the range of 35 to 60% by mass, in the range of 5 to 15% by mass and in the range of 30 to 55% by mass, respectively, (II) Average particle diameter of the mica flakes (Z) in the resin composition is in the range of 5 to 80 ?m, and (III) Elongation at failure point of the resin composition measured according to JIS K7127 is in the range of 30 to 70%.

Abstract: Provided is a vibration damping material comprising: a polyester resin containing dicarboxylic acid constitutional units and diol constitutional units; and mica being dispersed in the polyester resin, wherein: (1) a ratio [(A1+B1)/(A0+B0)] of a total of (A1) a number of the dicarboxylic acid constitutional units having an odd number of carbon atoms in a polyester main chain and (B1) a number of the diol constitutional units having an odd number of carbon atoms in the polyester main chain with respect to a total of (A0) a number of total dicarboxylic acid constitutional units and (B0) a number of total diol constitutional units in the polyester resin is in the range of 0.5 to 1; and (2) an average particle diameter calculated from a volume-based particle diameter frequency distribution of the mica in the vibration damping material is 25 to 500 ?m. The damping material has a high versatility, is lightweight, shows an excellent vibration damping property and can be produced easily with a batch mixer.

Abstract: Disclosed is a glycol compound which is useful as a raw material and an intermediate for synthetic resins, additives for synthetic resins, medicines, cosmetics, food additives, surfactants and the like, further disclosed is a method for producing the compound. The above glycol compound is represented by the following Formula (1): wherein A represents a divalent linkage group comprising a condensed aromatic ring selected from the group consisting of naphthalene, anthracene, phenanthrene and pyrene; R represents an alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 10 carbon atoms or a halogen atom; n represents an integer of 0 to 4; and when n represents an integer of 2 to 4, plural R may be the same or different from each other.

Abstract: Disclosed is a glycol compound which is useful as a raw material and an intermediate for synthetic resins, additives for synthetic resins, medicines, cosmetics, food additives, surfactants and the like, further disclosed is a method for producing the compound. The glycol compound is represented by the following Formula (1): wherein R represents an alkyl group having 1 to 12 carbon atoms, a substituted or unsubstituted aryl group having 6 to 10 carbon atoms or a halogen atom; n represents an integer of 1 to 4; and when n represents an integer of 2 to 4, plural R may be the same or different from each other.

Abstract: Provided is a vibration damping material, which includes a resin composition obtained by dispersing titanium dioxide (Y) and a mica flake (Z) in a polyester resin (X) containing dicarboxylic acid constitutional units an diol constitutional units, in which: (1) in the polyester resin (X), a ratio of a total of a number of the dicarboxylic acid constitutional units (A1) having an odd number of carbon atoms in a main chain and a number of the diol constitutional units (B1) having an odd number of carbon atoms in a main chain with respect to a total of a number of total dicarboxylic acid constitutional units (A0) and a number of total diol constitutional units (B0), i.e., [(A1+B1)/(A0+B0)] is in a range of 0.5 to 1; and (2) a mass ratio (X:Y:Z) of the polyester resin (X), the titanium dioxide (Y), and the mica flake (Z) is in a range of 15 to 40:5 to 30:30 to 80.

Abstract: Provided are a resin composition for a vibration damping material, including: a polyester resin mainly formed of a dicarboxylic acid constitutional unit and a diol constitutional unit; and a filler, in which the polyester resin contains: a dicarboxylic acid constitutional unit (A) mainly derived from an aromatic dicarboxylic acid, in particular, isophthalic acid; a diol constitutional unit (B) mainly derived from ethylene glycol; a constitutional unit (C) formed of an aliphatic dicarboxylic acid, an aliphatic diol, and/or an aliphatic hydroxycarboxylic acid each having 5 or more carbon atoms; and a flake-like or plate-like filler (D) and a filler (E) made of a particulate metal oxide as the filler; and a vibration damping material. Thus, there can be provided a vibration damping material exerting high vibration damping performance in a wide temperature region and being excellent in toughness and processability.

Abstract: Provided is a vibration damping material, which includes a resin composition obtained by dispersing titanium dioxide (Y) and a mica flake (Z) in a polyester resin (X) containing dicarboxylic acid constitutional units and diol constitutional units, in which: (1) in the polyester resin (X), a ratio of a total of a number of the dicarboxylic acid constitutional units (A1) having an odd number of carbon atoms in a main chain and a number of the diol constitutional units (B1) having an odd number of carbon atoms in a main chain with respect to a total of a number of total dicarboxylic acid constitutional units (A0) and a number of total diol constitutional units (B0), i.e., [(A1+B1)/(A0+B0)] is in a range of 0.5, to 1; and (2) a mass ratio (X:Y:Z) of the polyester resin (X), the titanium dioxide (Y), and the mica flake (Z) is in a range of 15 to 40:5 to 30:30 to 80.