Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1977-04-15
1978-10-17
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
260857TW, 264210R, 264289, 264290N, B29D 724
Patent
active
041209281
ABSTRACT:
A process for preparing a biaxially stretched film of a polyamide blend, which comprises (1) melt extruding a polyamide blend to make an unstretched film and (2) stretching the unstretched film first in the machine direction and then in the transverse direction, or (2') stretching the unstretched film first to make a uniaxially stretched film having a plane orientation index of about 0.6 to 1.7 and then stretching the uniaxially stretched film in a direction substantially at a right angle to the direction at the previous stretching, said polyamide blend comprising 97 to 80% by weight of an .alpha.-type aliphatic polyamide (Component A) and 3 to 20% by weight of at least one polyamide (Component B) selected from the group consisting of (i) an .alpha.-type aliphatic polyamide different from the Component A, (ii) a .gamma.-type aliphatic polyamide, (iii) a non-crystalline aliphatic polyamide, and (iv) a ring-containing polyamide which contains in the molecule 0 to 50 mol % of repeating units comprising a xylylenediamine residue.
REFERENCES:
patent: 3637906 (1972-01-01), Parathoen
patent: 3652759 (1972-03-01), Schlemmer et al.
patent: 3843479 (1974-10-01), Matsunami et al.
patent: 3968071 (1976-07-01), Miyamoto et al.
"An Investigation of the Structures of Polyamide Series"-Kinoshita-Die Makro Molecular Chemie, 33, 1 (1959), pp. 1-20.
Furukawa Kaoru
Matsunami Koichi
Murakami Tetsushi
Nagai Hiroshi
Ota Toshihiko
Thurlow Jeffery R.
Toyo Boseki Kabushiki Kaisha
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