Process for producing stretched articles of ultrahigh-molecular-

Details Process for producing stretched articles of ultrahigh-molecular- Process for producing stretched articles of ultrahigh-molecular-

1985-07-16

1986-09-16

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

2642106, 2642108, 264211, 2642896, D01F 110, D01D 5088

Patent

active

046121480

ABSTRACT:
Stretched articles of ultrahigh-molecular-weight polyethylene are prepared by melt-kneading a mixture of ultrahigh-molecular-weight polyethylene with a paraffinic wax having a melting point of 40.degree. to 120.degree. C. and a weight average molecular weight of at least 230 but less than 2000 in a screw extruder while maintaining the temperature of the mixture at 180.degree. to 280.degree. C. The molten mixture is melt-extruded through a die at a temperature of 180.degree. to 300.degree. C. under a draft condition of a draft ratio of less than 2 or in the absence of a draft and the resulting unstretched extrudate is cooled to solidify it. The unstretched solidified extrudate is than subjected to a stretching treatment in a heated liquid medium which is a solvent for the paraffinic wax at a temperature of 60.degree. to 140.degree. C. at a particular stretch ratio. Stretch shaped articles of ultrahigh-molecular-weight polyethylene having high tensile strength and modulus of elasticity are produced uniformly and reproducibly. The stretched shaped articles are substantially free from stretching uneveness. Examples of the paraffinic wax include n-alkanes having at least 22 carbon atoms.

REFERENCES:
patent: 3502764 (1970-03-01), Tardella
patent: 3665068 (1972-05-01), Duling et al.
patent: 3903234 (1975-09-01), Ikeda et al.
patent: 4327009 (1982-04-01), Allen et al.
patent: 4413110 (1983-11-01), Kavesh et al.
patent: 4422993 (1983-12-01), Smith et al.
patent: 4430383 (1984-02-01), Smith et al.
Chemical Abstracts, vol. 81, No. 24, Dec. 16, 1974, p. 88, No. 153964q, Columbus, Ohio.

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