RESIN COMPOSITION WITH CONTROLLED EXPANDABILITY

PURPOSE:To provide the titled compsn. with controlled expandability during molding, by adding a specified hindered phenol compd. to a copolymer of a methacrylate ester with an arom. monoalkenyl monomer. CONSTITUTION:30-70wt% methacrylate ester monomer such as ethyl methacrylate and 70-30wt% arom. mo...

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1. Verfasser:	TSUNODA RINICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PHYSICS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	PURPOSE:To provide the titled compsn. with controlled expandability during molding, by adding a specified hindered phenol compd. to a copolymer of a methacrylate ester with an arom. monoalkenyl monomer. CONSTITUTION:30-70wt% methacrylate ester monomer such as ethyl methacrylate and 70-30wt% arom. monoalkenyl monomer such as styrene are copolymerized in 2-20% (based on the combined amount of the monomers) diluent in the presence of a free radical-generating catalyst such as acetyl peroxide to obtain a copolymer having a viscosity of 2-10cP in 10% methyl ethyl ketone at 25 deg.C. 100-10,000ppm of a hindered phenol having an MW of 350 or above of formula I (wherein R1, R2 are each H, alkyl; R3 is an org. substituent of formula II, III, IV or V; R4 is H; R5 is t-butyl) is added to said copolymer. USE:Optical high-density information recording medium, cosmetics container.