Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1973-09-04
1976-08-10
White, Robert F.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
260 47C, 264 80, 264126, 264322, 264331, B29B 300
Patent
active
039742504
ABSTRACT:
Polyesters of para-oxybenzoyl are infusible and very resistant to acids and solvents, thus limiting the means by which such polymers can be fabricated. Such a polyester is made more amorphous, thus improving compression moldability, by subjecting it to a high temperature treatment, followed by a rapid quench. The resulting polymer has reduced crystalline orientation, as evidenced by X-ray diffraction patterns, and molded articles thereof have improved flexural strength, without adversely affecting the modulus. The thermal treatment is carried out on the polymer by heating at a temperature of at least 300.degree.C, and up to just below the decomposition temperature of the polymer, followed by quenching of the hot polymer.
REFERENCES:
patent: 3644593 (1972-02-01), Nowak et al.
patent: 3662052 (1972-05-01), Nowak et al.
patent: 3725519 (1973-04-01), Seifried et al.
patent: 3759870 (1973-09-01), Economy et al.
patent: 3790528 (1974-02-01), Tesaki et al.
patent: 3829406 (1974-08-01), Cottis et al.
Cottis Steve G.
Economy James
Storm Roger S.
Wohrer Luis C.
Dougherty David E.
Green Raymond W.
Lowe James B.
The Carborundum Company
White Robert F.
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