| 摘要 |
PURPOSE:To obtain a resin composition reduced in metal hydrate cpntent, excellent in mechanical strength and flame retardancy, generating no toxic gas in its combustion, useful for e.g. the electrical insulation of cables, by incorporating an ethylene-vinyl acetate copolymer of specific composition with a metal hydrate and specific foaming agent. CONSTITUTION:The objective resin composition can be obtained by incorporating (I) a composition prepared by incorporating (A) 100 pts.wt. of a base resin comprising an ethylene-vinyl acetate copolymer (EVA) containing >=20wt.% of vinyl acetate with (B) 150-230 pts.wt. of a metal hydrate (e.g. magnesium hydroxide) with (C) 0.1-20 pts.wt. of a foaming agent >=200 deg.C in decomposition temperature (e.g. azodicarbonamide) and, optionally, (D) an inorganic filter such as talc, flame retarding auxiliary such as antimony trioxide, antioxidant, light stabilizer, ultraviolet absorber, processing auxiliary, pigment, etc. This resin composition is reduced in metal hydrate content, improved in flame retardancy without decline in its mechanical properties, and generates no toxic halogen gas when burned, thus useful for e.g. electrical insulating protective tubes for electric cables. |
