Asahi Kasei Kogyo Kabushiki Kaisha

Jiro Kurita

Makoto Honda

Kazuhiro Hosoya

Kohe Ozawa

Masaharu Horikawa

Takeaki Abe

An acrylic resin having an intrinsic viscosity [.eta.] of about 0.028 to about 0.117 l/g and a weight-average molecular weight to number-average molecular weight ratio (Mw/Mn), measured by gel permeation chromatography of about 2.3 to about 6.0, said resin comprising the polymerization product of (1) about 50 to 100 wt. % of methyl methacrylate and (2) 0 to about 50 wt. % of at least one monomer selected from the group consisting of acrylic ester monomer and methacrylic ester monomer, said acrylic ester monomer comprising the reaction product of an alkyl alcohol having 1 to 8 carbon atoms and acrylic acid and said methacrylic ester comprising the reaction product of an alkyl alcohol having 2 to 12 carbon atoms and methacrylic acid.

Acrylic resin having excellent solvent resistance and moldability

An acrylic resin having resistance to crazing or crack formation when brought into contact with an organic solvent may be prepared by polymerizing or copolymerizing a monomer or monomers comprising (1) 50 to 100 wt. % of methyl methacrylate and (2) 0 to 50 wt. % of at least one monomer selected from the group consisting of an acrylic ester and a methacrylic acid ester, and adding a chain transfer agent after initiation and prior to completion of the polymerization. The acrylic resins have an intrinsic viscosity of 0.028 to 0.117 liters per gram, and a ratio of weight-average molecular weight to number-average molecular weight of 2.3 to 6.0.

Solvent resistent acrylic resin and process for producing the same

A novel three-component type acrylic resin composition comprising a C.sub.3 -C.sub.8 alkyl ester of acrylic acid, methyl acrylate and methyl methacrylate in a specific ratio. Such composition can be readily molded into a shaped article which is excellent in solvent resistance even upon being fabricated. The composition of the present invention is also featured by its good heat distortion temperature and mechanical strength, as compared to the conventional acrylic resin composition.

Solvent resistant acrylic resin composition

A process for preparing arcylate polymers comprising subjecting to suspension-polymerization a system (I) comprising an alkyl ester of methacrylic acid, said system (I) optionally containing an alkyl ester of acrylic acid and other vinyl monomer copolymerizable with said esters, to obtain a suspension containing polymer beads; and adding to the resulting suspension an aqueous suspension of a system (II) comprising an alkyl ester of acrylic acid and a cross-linking monomer, said system (II) optionally containing an alkyl ester of methacrylic acid and being employed in an amount of 20 to 70 parts by weight per 100 parts by weight of said system (I), under agitation at a temperature allowing substantial advance of polymerization to effect a final polymerization. The polymers obtained by the process are excellent in both the weather resistance and impact resistance, which are suitable for formation of molded products having excellent properties, especially, suitable for formation of films having a beautiful lustrous surface and excellent mechanical properties.

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Yokohama, Japan

Jiro Kurita