Techno-Umg Co., Ltd.

Umg Abs, Ltd.

Takashi Iwanaga

Yoshitaka Naito

Ichiro Kamata

Hironori Matsuyama

Hiroyuki Atsuta

Yuusuke Fukamachi

Kousaku Tao

Nobutaka Hase

What is provided is a RAFT polymerization reaction solution containing a RAFT agent represented by a specific chemical formula, water, and a water-soluble inorganic base, in which the RAFT polymerization reaction solution may further contain a polymerization initiator as an optional component, the RAFT agent has an acid group, the acid group forms a salt, and a molar ratio represented by M3/(M1+M2) is 1.0 to 10, in which the number of moles of the acid group forming the salt is indicated as M1, the number of moles of an acid group of the polymerization initiator, which may form a salt, is indicated as M2, and the number of moles of the water-soluble inorganic base is indicated as M3.

Raft polymerization reaction solution and raft polymerization reaction solution production method

A method for producing a rubbery polymer includes a step of preparing a mixture containing an alkyl (meth)acrylate, a hydrophobe, and an emulsifier, wherein an amount of the hydrophobe is 0.1-10 parts by mass relative to 100 parts by mass of the alkyl (meth)acrylate, and an amount of emulsifier is 0.01-1.0 part by mass relative to 100 parts by mass of the alkyl (meth)acrylate; a step of applying a shear force to the mixture to prepare a pre-emulsion, and a step of heating the pre-emulsion to polymerize the resulting mixture by miniemulsion polymerization.

Method of producing a rubbery polymer

A graft copolymer (B-III) includes a rubbery polymer (A-III) that is a miniemulsion polymerization reaction product of an alkyl (meth)acrylate; and at least one monomer selected from aromatic vinyl compounds, (meth)acrylic acid esters, and vinyl cyanide compounds graft-polymerized onto the rubbery polymer (A-III).

Graft copolymer, and thermoplastic resin composition using same

Provided is a rubbery polymer (A) including a unit of a crosslinking agent (I) represented by Formula (I) below and a unit of a (meth)acrylate ester (a). The volume-average particle size (X), the frequency upper limit 10%-volume particle size (Y), and the frequency lower limit 10%-volume particle size (Z) of the rubbery polymer (A) satisfy specific relationships. Also provided are a graft copolymer (B) produced by graft polymerization of one or more selected from an aromatic vinyl and a vinyl cyanide onto the rubbery polymer (A), a thermoplastic resin composition including the graft copolymer (B), and a molded article produced by molding the thermoplastic resin composition.CH&#x2550;CR&#x2014;CO-(Q)-COCR&#x2550;CH&#x2003;&#x2003;(I)

Rubbery polymer, graft copolymer, and thermoplastic resin composition

A graft copolymer has good moldability and good continuous moldability, and a thermoplastic resin molded article having excellent impact resistance can be produced. A method can produce the graft copolymer. A graft copolymer (B-I) produced by grafting at least one vinyl monomer (b-I) selected from the group consisting of an aromatic vinyl, an alkyl (meth)acrylate, and a vinyl cyanide to a rubbery polymer mixture including a rubbery polymer (A-I) and a hydrophobic substance, the rubbery polymer (A-I) including an alkyl (meth)acrylate unit and a multifunctional monomer unit copolymerizable with the alkyl (meth)acrylate, the hydrophobic substance having a kinematic viscosity of 5 mm/s or more at 40&#xb0; C. or a kinematic viscosity of 2 to 4 mm/s at 100&#xb0; C., a principal constituent of the hydrophobic substance being a hydrocarbon. A thermoplastic resin composition includes the graft copolymer (B-I). A molded article produced uses the thermoplastic resin composition.

A thermoplastic resin composition of the present invention contains a graft copolymer (B) obtained by polymerizing a vinyl-based monomer component (m1) in the presence of a composite rubber polymer (A) formed from a polyorganosiloxane (Aa) and a poly(meth)acrylate ester (Ab), and a (meth)acrylate ester resin (C) obtained by polymerizing a vinyl-based monomer component (m2), wherein the amount of the polyorganosiloxane (Aa) relative to the total mass (100% by mass) of the composite rubber polymer (A) is from 1 to 20% by mass, the volume average particle size of the composite rubber polymer (A) is from 0.05 to 0.15 &#x3bc;m, and relative to the total mass (100% by mass) of the vinyl-based monomer component (m2), the amount of the maleimide-based compound is from 1 to 30% by mass, and the amount of the aromatic vinyl compound is from 5.5 to 15% by mass.

Growing community of inventors

Ube, Japan

Takashi Iwanaga