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

1991-01-10

1992-03-31

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264101, 264216, A29C 4126

Patent

active

051005930

ABSTRACT:
A poly(arylene sulfide) sheet excellent in planarity and smoothness is formed of a poly(arylene sulfide) having a melt viscosity, .eta..sup.* of 1,000-25,000 poises as measured at 310.degree. C. and a shear rate of 200 sec.sup.-1, and a melt crystallization temperature, Tc.sub.2 of 170.degree.-240.degree. C., wherein Tc.sub.2 is an exothermic peak temperature of crystallization which appears upon the measurement by a differential scanning calorimeter at a cooling rate of 10.degree. C./min after the polymer is heated from 23.degree. to 380.degree. C. at a rate of 10.degree. C./min and then held for 3 minutes at 380.degree. C. It has a surface roughness, Ra of 0.09 .mu.m 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):

REFERENCES:
patent: 4370469 (1983-01-01), Deguchi et al.
patent: 4645826 (1986-01-01), Iizuka et al.
patent: 4769190 (1988-09-01), Usumi

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