Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1983-12-28
1985-10-08
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264211, 26433117, D01F 110, D01D 5092
Patent
active
045459509
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. and the resulting unstretched extrudate is cooled to solidify it. The unstretched solidified extrudate is then subjected to a stretching treatment 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), Tordella
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.
Mantoku Hitoshi
Motooka Masanori
Ohno Takao
Lowe James
Mitsui Petrochemical Industries Ltd.
LandOfFree
Process for producing stretched articles of ultrahigh-molecular- does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for producing stretched articles of ultrahigh-molecular-, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing stretched articles of ultrahigh-molecular- will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2218970