Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1976-11-05
1978-10-31
Danison, Walter C.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
264176R, 426108, 426123, C08L 6702
Patent
active
041234731
ABSTRACT:
A sheet formed from a uniform blend of from about 80 to 97% by weight of polyethylene terephthalate having an intrinsic viscosity of above about 0.9 and a melt viscosity at 525.degree. F. of above about 10,000 poises and correspondingly from about 20 to 3% by weight of a polycarbonate resin having an intrinsic viscosity of about 0.4 to 0.6 and a melt viscosity at 500.degree. F. of less than 50,000 poises; said sheet having a haze value as determined by ASTM D-1003 of less than about 2% and being essentially amorphous and non-oriented. Also disclosed is a process for forming a sheet which comprises uniformly blending the composition, extruding the composition into a sheet at a temperature between about 490.degree. to 530.degree. F. and rapidly cooling the sheet by contact with at least one cooling surface maintained at a surface temperature in the range of about 50.degree. to 160.degree. F. for a period of time not exceeding about 15 seconds. Containers may be formed from such sheets by a thermoforming step at temperatures in the range of about 210.degree. to 280.degree. F.
REFERENCES:
patent: 3218372 (1965-11-01), Okamura et al.
patent: 3720732 (1973-03-01), Sevenich
patent: 3745150 (1973-07-01), Corsover
patent: 3956229 (1976-05-01), Bollen et al.
patent: 3975355 (1976-08-01), Bollen et al.
Amin Surendra A.
Bollen Phillip S.
Sacks William
Allied Chemical Corporation
Criss Roger H.
Danison Walter C.
Naylor Henry E.
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