| 摘要 |
<p>A multi-layer composition comprises (a) a first layer comprising semicrystalline copolymer comprising interpolymerized units derived from tetrafluoroethylene and allylic hydrogen-containing olefin monomer (e.g., propylene), wherein less than 10 % of the total heat of fusion is attributable to a secondary melt-transition above 300 ~C as shown by the heating curve from Differential Scanning Calorimetry; and (b) a second layer comprising meltprocessable polymer (e.g., polyethylene) which is both substantially thermally stable and capable of being melt-processed at temperatures below the decomposition temperature of the semi-crystalline copolymer. The multi-layer composition can be used to form shaped articles (e.g., films, sheets, tubing, coated wires, cable jacketing, or bottles) for use in a variety of applications.</p> |
