Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-07-16
1976-05-11
Czaja, Donald E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260860, 260DIG35, C08G 3910
Patent
active
039562298
ABSTRACT:
This invention provides a film or sheet capable of being thermoformed into a shaped article and being formed from a blend of about 60 to 85 parts by weight of a polyethylene terephthalate polymer having an intrinsic viscosity of at least about 0.90 and correspondingly about 40 to 15 parts by weight of a polycarbonate polymer, the polyethylene terephthalate portion of the film or sheet having a degree of crystallinity in the range of about 20 to 40%. The film is essentially non-oriented. The present invention also provides shaped articles thermoformed from such film or sheet, such as cook-in-trays. Moreover, this invention provides a process of forming such film or sheet which comprises the steps of blending about 60 to 85 parts by weight of a polyethylene terephthalate polymer having an intrinsic viscosity of at least about 0.90 with correspondingly about 40 to 15 parts by weight of a polycarbonate resin, extruding the resultant blend at a temperature of above about 500.degree.F onto a moving support such as a casting roll while maintaining the surface of the support at a temperature of about 225.degree. to 380.degree.F whereby a film or sheet of the blend is formed, and collecting the thus formed film or sheet.
REFERENCES:
patent: 3218372 (1965-11-01), Okamura et al.
patent: 3479318 (1969-11-01), Jackson et al.
patent: 3516957 (1970-06-01), Gray et al.
patent: 3720732 (1973-03-01), Sevenich
patent: 3833685 (1974-09-01), Wambach
patent: 3855277 (1974-12-01), Fox
patent: 3889039 (1975-06-01), Wainer
I. Goodman et al., Polyesters, Vol. 1: Saturated Polyesters, 1965, p. 61.
Amin Surendra A.
Bollen Phillip Stuart
Sacks William
Allied Chemical Corporation
Criss Roger H.
Czaja Donald E.
Henry Patrick L.
Person S. M.
LandOfFree
Films and sheets of polyester-polycarbonate blends does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Films and sheets of polyester-polycarbonate blends, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Films and sheets of polyester-polycarbonate blends will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1302016