| 摘要 |
The invention relates to the use of a microcrystalline polyamide for producing an object whose entire or partial external surface consists of said microcystalline polyamide having a specific surface state and wherein the object production involves heating stages between a Tg (vitreous transition temperature) and a Tm (fusion temperature) of said microcrystalline polyamide, the microcrystalline polyamide transparency is such that the light transmission of 560 nm to a polished 1 mm thick object is >80 %, preferably >88 %, wherein said transparency is measured on the obtained object by means of usual methods for carrying out calandring film injection or extrusion. Advantageously, said microcrystalline polyamide has a crystallinity ratio ranges from > 10 % to > 30 % (1<SUP>st</SUP> DSC heating according to ISO 11357 at 40 °C/m) and a fusion enthalpy from > 25J/g tot < 75J/G (1<SUP>st</SUP> DSC heating according to ISO 11357 at 40 °C/m). In the preferred embodiment, the Tg (vitreous transition temperature) ranges from 40 °C to 90 °C and the Tm (fusion temperature) ranges from 150 °C to 200 °C. Advantageously, a monomer linking is carried out in such a way that 50 and more % by weight of said monomers are in >=C9 (number of carbon atoms >=9).
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