Process for the manufacture of molded articles from polyolefins

Details Process for the manufacture of molded articles from polyolefins Process for the manufacture of molded articles from polyolefins

1977-07-27

1978-08-29

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Plural, intermittent pressure applying

264126, 264319, 264325, B29C 300

Patent

active

041103912

ABSTRACT:
A process for the manufacture of a molded article from a powder form of a polyolefin of molecular weight of at least one million which comprises introducing a homopolymer of ethylene or a copolymer of ethylene with an .alpha.-olefin of 3 to 10 carbon atoms having a molecular weight of at least one million into a mold loosely closed with a plug, heating the same in said mold in an inert atmosphere at a temperature of 150.degree. to 250.degree. C, whereby said polyolefin is transformed into a rubbery elastic state, thereafter compressing said polyolefin in said mold for at least two minutes at a pressure of 2.5 to 25 N/mm.sup.2 and thereafter compressing said polyolefin for at least one minute at a pressure of 40 to 100 N/mm.sup.2.

REFERENCES:
patent: 3026570 (1962-03-01), Beck et al.
patent: 3134830 (1964-05-01), Roelen
patent: 3975481 (1976-08-01), Baumgaertner

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