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AssigneeKyowa Gas Chemical Industry Co., Ltd.
InventorsHaruo Nagai, Tetsuo Suzuki, Kazuhiro Sato
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A methacrylic resin molding material, comprising a partially cross-linked polymer gel obtained by partially polymerizing a mixture comprising (A) a resin raw material selected from the group consisting of monomeric alkyl methacrylates, .alpha., .beta.-ethylenically unsaturated monomer mixtures formed preponderantly of alkyl methacrylates and a syrup containing at least one of said monomers and at least one of the polymers thereof and (B) 4 to 150 parts by weight of a cross-linking agent based on 100 parts by weight of said resin raw material in the presence of a polymerization initiator, whereby a cross-linked polymer is formed with the aid of said cross-linking agent and said polymerization initiator to the extent that increase of the polymer formed thereby reaches 4 to 62% by weight over the polymer content of said mixture with the total polymer content kept from exceeding the upper limit of 62% by weight said molding material being recovered from the polymerization system as a non-sticky, easy-handled gel-like material which has shape-retaining properties, but which, on the application of shear stress, at normal room temperature or at an elevated temperature, is enabled to flow, and preserved for use in the manufacture of shaped articles.
A methacrylic resin molding material comprising a partially cross-linked polymer gel obtained by partially polymerizing a mixture comprising (A) a resin raw material selected from the group consisting of monomeric C1-C4-alkyl methacrylates, .alpha.,.beta.-ethylenically unsaturated monomer mixtures formed predominantly of C1-C4-alkyl methacrylates, and a syrup containing at least one of said monomers and at least one of the polymers thereof and (B) 4 to 150 parts by weight of a cross-linking agent based on 100 parts by weight of said resin raw material in the presence of a polymerization initiator, whereby a cross-linked polymer is formed with the aid of said cross-linking agent and said polymerization initiator to the extent that the total polymer content reaches between 4 to 62% by weight over the polymer content of said mixture with the total polymer content kept from exceeding the upper limit of 62% by weight, said molding material being recovered from the polymerization system as a non-sticky, easy-handled, kneadable gel-like material which has shape-retaining properties, but which, on the application of shear stress, at normal room temperature or at an elevated temperature, is enabled to flow, and preserved for use in the manufacture of shaped articles.
A method for the production of methacrylic resin molding material formed of a partially cross-linked polymer gel obtained by partially polymerizing a mixture comprising (A) a resin raw material selected from the group consisting of monomeric C1-C4-alkyl methacrylates, .alpha.,.beta.-ethylenically unsaturated monomer mixtures formed predominantly of C1-C4-alkyl methacrylates, and a syrup containing at least one of said monomers and at least one of the polymers thereof and (B) 4 to 150 parts by weight of a cross-linking agent based on 100 parts by weight of said resin raw material in the presence of a polymerization initiator, whereby a cross-linked polymer is formed with the aid of said cross-linking agent and said polymerization initiator to the extent that the total polymer content reaches between 4 to 62% by weight over the polymer content of said mixture with the total polymer content kept from exceeding the upper limit of 62% by weight, recovering from the polymerization system the so-obtained non-sticky, easy-handled, kneadable gel-like material which has shape-retaining properties, but which, on the application of shear stress, at normal room temperature or at an elevated temperature, is enabled to flow, and preserving the same for use in the manufacture of shaped articles.
A method for preparing a shaped article composed of polymeric methacrylic resin materials which method comprises supplying a compression mold, an extrusion mold, an injection mold or a transfer mold with a methacrylic resin molding material capable of further polymerization at a temperature in the range of 90.degree. to 180.degree. C. and heating the same to said temperature, to carry out the completion of the polymerization of the remaining monomer and thereby to effect formation of articles of desired shape in the mold, wherein the said methacrylic resin molding material is a partially cross-linked polymer gel obtained by partially polymerizing a mixture comprising (A) a resin raw material selected from the group consisting of monomeric C1-C4-alkyl methacrylates, .alpha.,.beta.-ethylenically unsaturated monomer mixtures formed predominantly of C1-C4-alkyl methacrylates, and a syrup containing at least one of said monomers and at least one of the polymers thereof and (B) 4 to 150 parts by weight of a cross-linking agent based on 100 parts by weight of said resin raw material in the presence of a polymerization initiator, whereby a cross-linked polymer is formed with the aid of said cross-linking agent and said polymerization initiator to the extent that the total polymer content reaches between 4 to 62% by weight over the polymer content of said mixture with the total polymer content kept from exceeding the upper limit of 62% by weight, recovering from the polymerization system the so-obtained non-sticky, easy-handled, kneadable gel-like material which has shape-retaining properties, but which, on the application of shear stress, at normal room temperature or at elevated temperatures, is enabled to flow.
Dependencies are inferred from the claim text.