Kuraray Co., Ltd.

Hiroshi Ozawa

Yasuhito Kitade

Atsuhiro Nakahara

Toru Takahashi

Shouji Tanaka

Toru Abe

Takuro Niimura

Yusaku Nomoto

Atsushi Matsumura

Hiroyuki Konishi

Takashi Fukumoto

Kenichi Hamada

Yoshihiro Morishita

Motohiro Fukuda

Toyoaki Kurihara

Tomiaki Otake

Masashi Akari

Nobutaka Hiraoka

Yuichi Katoh

The present invention provides a multilayered acrylic polymer coagulate characterized in that the coagulate has a bulk density of 0.3 to 0.6 g/cmand a median diameter of 50 to 400 μm and contains particles having a particle diameter of 75 or less in a proportion of 50% or less, and the amount of alkali metal and alkaline earth metal contained in the coagulate satisfies the following formula (1):Σ()×(120−)≤100  (1)wherein

Acrylic polymer coagulates

A resin film comprising a resin (A) and a multi-layered particle (B), the multi-layered particle comprising a layer (a) made of a polymer comprising 80 to 99.99% by mass of a methyl methacrylate unit, 0.01 to 2% by mass of a crosslinkable monomer unit and 0 to 19.99% by mass of additional copolymerizable monomer units, a layer (b) made of a polymer comprising 70 to 99.8% by mass of an alkyl acrylate unit, 0.2 to 10% by mass of a crosslinkable monomer unit and 0 to 29.8% by mass of additional copolymerizable monomer units, and a layer (c) made of a polymer comprising 80 to 100% by mass of a methyl methacrylate unit and 0 to 20% by mass of additional copolymerizable monomer units, wherein an amount of the layer (a) is 5 to 15 parts by mass, an amount of the layer (b) is 40 to 60 parts by mass and an amount of the layer (c) is 35 to 50 parts by mass, based on 100 parts by mass of the total amount of the layer (a), the layer (b) and the layer (c), and the layer (a), the layer (b) and the layer (c) are arranged in this order from the center of the particle toward the outer surface of the particle, and a volume-based average particle diameter is 90 to 150 nm.

Resin film

A methacrylic resin composition comprising not less than 90% by mass of a methacrylic resin, wherein the methacrylic resin comprises 95 to 100% by mass of methyl methacrylate monomer units and 0 to 5% by mass of acrylate monomer units, the methacrylic resin has an Mw of 57000 to 90000, Mw representing a weight-average molecular weight, and a ratio Mw/Mn of not more than 1.9, Mn representing a number-average molecular weight, the methacrylic resin composition has an absolute value of a difference between YI4 and YI2 of not more than 3, YI4 representing a yellow index at an optical path length of 200 mm of an injection-molded article obtained at a cylinder temperature of 280&#xb0; C. in a molding cycle of 4 minutes, YI2 representing a yellow index at an optical path length of 200 mm of an injection-molded article obtained at a cylinder temperature of 280&#xb0; C. in a molding cycle of 2 minutes, and meets a relationship represented by Formula (B) and Formula (C):R&#x2265;11&#x2003;&#x2003;Formula (B)0.8&#x3c;R/E&#x3c;1.2&#x2003;&#x2003;Formula (C)where R represents the melt flow rate of the methacrylic resin composition as measured at 230&#xb0; C. under a load of 3.8 kg, the melt flow rate R being expressed in g/10 min; and E represents a value calculated by Formula (A), the value E being expressed in g/10 min, the Formula (A) being E=exp (0.17112&#xd7;W&#x2212;0.00399&#xd7;P+5.09713) where W represents the ratio of acrylate monomer units to the total monomer units in the methacrylic resin, the ratio W being expressed in % by mass; and P represents the degree of polymerization of the methacrylic resin.

Methacrylic resin composition and injection-molded article

A methacrylic resin composition containing 10 to 99 parts by mass of a methacrylic resin (A) containing 80% by mass or more of a methyl methacrylate unit, and 90 to 1 part by mass of a block copolymer (B) containing 10 to 60% by mass of a methacrylic acid ester polymer block (b1) and 90 to 40% by mass of an acrylic acid ester polymer block (b2), where the total of the methacrylic resin (A) and the block copolymer (B) is 100 parts by mass, where a weight-average molecular weight Mwof the methacrylic resin (A), a maximum weight-average molecular weight Mwof the methacrylic acid ester polymer block (b1) and a maximum weight-average molecular weight Mwof the acrylic acid ester polymer block (b2) satisfy (1): 0.5&#x2264;Mw/Mw&#x2264;2.5 and (2): 40000&#x2264;Mw&#x2264;120000.

Methacrylic resin composition

A methacrylic resin composition comprises not less than 90% by mass and not more than 100% by mass of a methacrylic resin [A] having: the total content of a structural unit derived from methyl methacrylate of not less than 90% by mass; a molecular weight Mof not less than 30000 and not more than 100000 in terms of polystyrene corresponding to the retention time indicating the value of the maximum strength in a chromatogram obtained by gel permeation chromatography; the area Sof a region enclosed by an approximate curve obtained by fitting the data of a range indicating the strength of not less than 70% relative to the value of the maximum strength to a Gaussian function by the method of nonlinear least squares and the base line of the chromatogram of 45 to 80% of the area Senclosed by the chromatogram and its base line; and the ratio Mw/Mnof a weight average molecular weight Mwto a number average molecular weight Mnof not less than 1.01 and not more than 1.20 in terms of polystyrene computed based on an approximate curve obtained by the above fitting.

Methacrylic resin or methacrylic resin composition

A copolymer comprising a structural unit (I) derived from a phosphonate monomer (1) such as diethyl methacryloyloxymethyl phosphonate and diethyl 2-methacryloyloxyethyl phosphonate, a structural unit (II) derived from a radical polymerizable monomer (2) such as methacrylic acid, acrylic acid, 8-tricyclo[5.2.1.0]decanyl methacrylate, and t-butyl methacrylate, and a structural unit (III) derived from methyl methacrylate, the content of phosphorus atoms derived from the phosphonate monomer (1) being not less than 1.0% by mass and less than 2.0% by mass relative to the mass of the copolymer, and a formed article comprising the copolymer.

Copolymer and molded article

Provided are a break-resistant copolymer having high transparency and heat resistance and also having a high tensile strain at break, and a molded article. A copolymer contains 80% by mass to 98% by mass of structural units derived from a methacrylic ester monomer and 2% to 10% by mass of ester structural units derived from a cyclic ketene acetal monomer. The copolymer has a weight average molecular weight of 80,000 or more and a molecular weight distribution of 1.75 to 3.80.

Copolymer, and molded article

A methacrylic resin [1] having a triad syndiotacticity (rr) of not less than 65% and a methacrylic resin [2] having a triad syndiotacticity (rr) of 45 to 58% are melt kneaded in a mass ratio of the methacrylic resin [1]/the methacrylic resin [2] of 40/60 to 70/30, and further melt kneaded preferably with a polycarbonate resin in a ratio of 1 to 10 parts by mass of the polycarbonate resin to the total 100 parts by mass of the methacrylic resin [1] and the methacrylic resin [2] to obtain a methacrylic resin composition.

Methacrylic resin composition and molded body thereof

A method for producing a (meth)acrylic resin composition, comprising: continuously feeding reaction starting materials to a tank reactor, the reaction starting materials comprising a polymerizable monomer component, a chain transfer agent and a radical polymerization initiator, the polymerizable monomer component comprising 50 to 100% by mass of methyl methacrylate, 0 to 20% by mass of an acrylic acid alkyl ester and 0 to 30% by mass of an additional monomer; conducting bulk polymerization of the polymerizable monomer component at a polymerization conversion ratio of 40 to 70% by mass to obtain a liquid containing a (meth)acrylic resin; continuously feeding the resulting liquid to a vented extruder to separate volatile component from the (meth)acrylic resin; conducting distillation using an atmospheric distillation column to separate the volatile component into a high boiling fraction (C) and a low boiling fraction (A); and conducting distillation using a vacuum distillation column having a pressure of &#x2212;50 kPaG to &#x2212;101 kPaG at the top of the vacuum distillation column to separate the high boiling fraction (C) into a high boiling fraction (C) and a low boiling fraction (A); reusing the low boiling fraction (A) and the low boiling fraction (A) as part of the reaction starting materials.

Process for producing (meth)acrylic resin composition

A (meth)acrylic resin composition is obtained by a method comprising: continuously feeding a raw material solution essentially comprising methyl methacrylate, a chain transfer agent and a radical polymerization initiator, and optionally comprising an acrylic acid alkyl ester in a mass ratio of the acrylic acid alkyl ester to the methyl methacrylate of 0/100 to 20/80 into a tank reactor to allow bulk polymerization to proceed in the tank reactor at a polymerization conversion ratio of 40 to 70% by mass to obtain a reaction product while continuously discharging the reaction product from the tank reactor; heating the discharged reaction product with a heat exchanger; removing volatile matter from the heated reaction product; filtrating a liquid additive through a filter; and adding the filtrated liquid additive to the reaction product from which the volatile matter has been removed.

Method for producing (meth)acrylic resin composition

A method for producing a (meth)acrylic resin composition, the method comprising continuously feeding a polymerizable monomer component comprising 50 to 100% by mass of methyl methacrylate, 0 to 20% by mass of an acrylic acid alkyl ester and 0 to 30% by mass of an additional monomer, a chain transfer agent, and a radical polymerization initiator to a tank reactor; conducting bulk polymerization of the polymerizable monomer component at a polymerization conversion ratio of 40 to 70% by mass to obtain a liquid containing a (meth)acrylic resin; continuously feeding the liquid to a vented extruder to separate a volatile component from the (meth)acrylic resin; continuously feeding the separated volatile component to a distillation column to obtain a fraction containing methyl methacrylate; adding a polymerization inhibitor to the fraction; and reusing the fraction which contains the polymerization inhibitor as part of the polymerizable monomer component.

A (meth)acrylic resin composition is obtained by a method that comprises: preparing a liquid starting material (A) comprising methyl methacrylate, an acrylic acid alkyl ester and a chain transfer agent, having a mass ratio of the acrylic acid alkyl ester to the methyl methacrylate of 0/100 to 20/80, and having a dissolved oxygen concentration of not more than 50 ppm, preparing a liquid starting material (B) comprising a radical polymerization initiator, a polymerization inhibitor and methyl methacrylate, and having been maintained at a temperature of not more than 10&#xb0; C. in the presence of oxygen, continuously feeding the liquid starting material (A) and the liquid starting material (B) into a tank reactor, allowing bulk polymerization to proceed in the tank reactor at a polymerization conversion ratio of 40 to 70% by mass to give a reaction product, and continuously discharging the reaction product from the tank reactor.

Production method of (meth)acrylic resin composition

A method of producing a (meth)acrylic resin composition. The method comprises a step of continuously feeding a monomer mixture comprising 80 to 100% by mass of methyl methacrylate and 20 to 0% by mass of an alkyl acrylate to a tank reactor and bulk polymerizing the monomer mixture until obtaining a polymerization conversion of 40 to 70% by mass to prepare a reaction product; continuously discharging the reaction product, and heating the reaction product to 200&#xb0; C. to 270&#xb0; C. with a heater, and then separating the unreacted monomer with a extruder equipped with a vent; and transferring the separated unreacted monomer entrained by an inert gas flow to reuse the separated unreacted monomer as a raw material of the monomer mixture.

A copolymer comprising a structural unit (I) derived from a phosphonate monomer (1) such as diethyl methacryloyloxymethyl phosphonate, diethyl 2-methacryloyloxyethyl phosphonate and the like, and a structural unit (II) derived from a radical polymerizable monomer (2) such as methacrylic acid, acrylic acid, 8-tricyclo[5.2.1.0]decanyl methacrylate, t-butyl methacrylate and the like, wherein the content of phosphorus atoms from the phosphonate monomer (1) is 2.0 to 6.0% by mass relative to the mass of the copolymer. A formed article comprising the copolymer.

Copolymer and molded body

A methacrylic resin composition containing 10 to 99 parts by mass of a methacrylic resin (A) containing 80% by mass or more of a methyl methacrylate unit, and 90 to 1 part by mass of a block copolymer (B) containing 10 to 60% by mass of a methacrylic acid ester polymer block (b1) and 90 to 40% by mass of an acrylic acid ester polymer block (b2), where the total of the methacrylic resin (A) and the block copolymer (B) is 100 parts by mass, where a weight-average molecular weight Mwof the methacrylic resin (A), a maximum weight-average molecular weight Mwof the methacrylic acid ester polymer block (b1) and a maximum weight-average molecular weight Mwof the acrylic acid ester polymer block (b2) satisfy (1): 0.5&#x2266;Mw/Mw&#x2266;2.5 and (2): 40000&#x2266;Mw&#x2266;120000.

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Tainai, Japan

Hiroshi Ozawa