TRANSPARENT HEAT-RESISTANT THERMOPLASTIC RESIN COMPOSITION

• Main Authors: UEDA KENICHI, FUJIOKA KAZUCHIKA
• Format: Patent
• Language: English
• Published: 26.05.2000
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a transparent, heat-resistant thermoplastic resin composition having adjusted refractive index and compatibility, having excellent transparency, and excellent in the balance of heat resistance, impact resistance and molding processability. SOLUTION: This transparent, heat-resistant thermoplastic resin composition consists mainly of (A) a rubber-modified styrenic resin, (B) a heat-resistant resin having a Vicat softening point of >=120 deg.C, and (C) one or more other thermoplastic resins. Therein, the transparent, heat-resistant thermoplastic resin composition satisfies the inequality: |nDA1-nDm|<=0.01, wherein nDm=(wA2×nDA2+wB×nDB+wC×nDC)/(wA2+wB+wC). Therein, nDA1, nDm, nDB, nDC are the refractive indexes of the rubber portions of the component A, the matrix portion of the component A, the component B and the component C, respectively, and wA1, wA2, wB, and wC are the weights (wt.%) of the rubber portion of the component A, the matrix portion of the component A, the component B and the component C, respectively. The matrix of the component A is thermodynamically compatible with a mixture comprising the components B and C. The 3 mm thick flat plate molded product of the thermoplastic resin composition preferably has a whole light transmittance of >=75%. Since the refractive index of the thermoplastic resin composition is adjusted in such the manner as above, the refractive index can easily finely be adjusted.