JPH0561285B

PURPOSE:To obtain the titled substrate having low birefringence and improved strength and solvent resistance, by hardening a methacrylic partial polymer containing a monoethylenically unsaturated monomer consisting essentially of methyl methacrylate and a crosslinking monomer in a specific proportio...

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Bibliographische Detailangaben
Hauptverfasser:	HASEGAWA TERUO, ARAKAWA KOJI, OOTANI MITSUO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the titled substrate having low birefringence and improved strength and solvent resistance, by hardening a methacrylic partial polymer containing a monoethylenically unsaturated monomer consisting essentially of methyl methacrylate and a crosslinking monomer in a specific proportion. CONSTITUTION:A uniform methacrylic partial polymer consisting of (A) 90-99.7 wt% monoethylenically unsaturated monomer consisting essentially of methyl methacrylate, and (B) 0.3-10wt% crosslinking monomer preferably polyethylene glycol di(meth)acrylate (having 170-1,020 molecular weight of the polyethylene glycol), neopentyl glycol di(meth)acrylate, pentaerythritol tri(meth)acrylate and/or trimethylolpropane tri(meth)acrylate, and having 5-200 poises viscosity (25 deg.C) is hardened under pressing and heating conditions in the presence of a radical polymerization initiator in a mold to give the aimed substrate.