Process to form amorphous, crystallizable thermoplastic polymers

Details Process to form amorphous, crystallizable thermoplastic polymers Process to form amorphous, crystallizable thermoplastic polymers

1984-02-15

1985-04-02

Phynes, Lucille M.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428220, 528323, 528324, F16L 1100

Patent

active

045087695

ABSTRACT:
A method of forming an amorphous crystallizable thermoplastic polymer composition. The polymer composition has a modulus of rigidity which decreases to a minimum value with increasing temperature and then begins to increase. The process includes heating polymer to below a temperature at which crystal formation occurs and form the polymer. The polymer composition is then heated to a temperature at which crystal formation can occur and be annealed. This process is useful to make articles having a thickness of from 0.127 cm (0.050 inches) to 1.27 cm (0.50 inches) such as sheets and tubes of the amorphous polymer and then reforming and annealing them.

REFERENCES:
patent: 3861973 (1975-01-01), Koch
patent: 4028476 (1977-06-01), Kleinschmidt et al.
patent: 4243074 (1981-01-01), Strutzel et al.
patent: 4444829 (1984-04-01), Bollen et al.
patent: 4455417 (1984-06-01), Vanderkooi et al.

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