Poly(arylene sulfide) sheet and production process thereof

Details Poly(arylene sulfide) sheet and production process thereof Poly(arylene sulfide) sheet and production process thereof

B - Operations, Transporting

29

C

18/1036

B29C 41/26 (2006.01) B29C 47/00 (2006.01) B29C 47/88 (2006.01) B29D 7/01 (2006.01)

Patent

CA 2004273

(1) ABSTRACT A poly(arylene sulfide) sheet excellent in planarity and smoothness is formed of a poly(arylene sulfide) having a melt viscosity, ?* of 1,000-25,000 poises as measured at 310°C and a shear rate of 200 sec- 1, and a melt crystallization temperature, Tc2 of 170- 240°C, wherein Tc2 is an exothermic peak temperature of crystallization which appears upon the measurement by a differential scanning calorimeter at a cooling rate of 10°C/min after the polymer is heated from 23°C to 380°C at a rate of 10°C/min and then held for 3 minutes at 380°C. It has a surface roughness, Ra of 0.09 µm or less on at least one side thereof and a degree of crystallization of at least 5%. Its number of flexings to break, Y satisfies the following equation (I): log Y ? 7.11 - 2.34log t (I) wherein t means a thickness (~µm) of the sheet. The sheet is produced by melt-extruding the poly(arylene sulfide) through a slit die into a sheet-like form and then cooling and crystallizing the sheet on a casting roll. The temperature, T (°C) of the casting roll is controlled to a temperature ln a range satisfylng the following equation (II): 120 ? T ? 190 - 0.02t (II) wherein t means a thickness (µm) of the sheet, thereby conducting the cooling and the crystallization of the - 78 - (2) sheet at one stage.

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