Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1976-01-07
1976-08-17
Jacobs, Lewis T.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264 92, 264176R, 264216, B29C 1704, B29F 3012
Patent
active
039754855
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: 2743250 (1956-04-01), Sweet et al.
patent: 3155756 (1964-11-01), Hechelhammer et al.
patent: 3423493 (1969-01-01), Klenk et al.
patent: 3775521 (1973-11-01), Yamamota et al.
patent: 3790327 (1974-02-01), Haberle
patent: 3836620 (1974-09-01), Bhuta et al.
patent: 3840497 (1974-10-01), Gondorchin et al.
Amin Surendra A.
Bollen Phillip Stuart
Sacks William
Allied Chemical Corporation
Criss Roger H.
Henry Patrick L.
Jacobs Lewis T.
Person S. M.
LandOfFree
Production of 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 Production of 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 Production of films and sheets of polyester-polycarbonate blends will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1486461