| abstract |
PURPOSE: To improve the oxygen barrier properties of a hot water circulating pipe for floor heating, by blending a saponified ethylene/vinyl acetate copolymer, polybutene and optionally a modified polyolefin. n CONSTITUTION: A saponified ethylene/vinyl acetate copolymer (A) having an ethylene content of 20W60mol% and a degree of saponification of 95% or above, a polybutene (B) and optionally modified polyolefin (C) having a chemically bonded modifier content of 0.01W10wt%, modified with an unsaturated carboxylic acid or anhydride, are blended together. Component A is used in a quantity of 10W50pts.wt. per 100pts.wt. component B. Pref. 1W20pts.wt. component C' is added thereto. As component B, maleic anhydride-modified polybutene is preferred. As component C, malenic anhydride-modified polyolefins (e.g. 2W12C α-olefin polymers) are preferred. By improving the oxygen barrier properties, metallic parts of heat exchangers, in hot water circulating passage can be prevented from being corroded. n COPYRIGHT: (C)1986,JPO&Japio |