Toyo Boseki Kabushiki Kaisha

Kaoru Furukawa

Hiroshi Nagai

Koichi Matsunami

Hikoichi Nagano

Tetsushi Murakami

Takashi Akiyama

Hideo Ikeda

Kazuo Tamaki

Toshihiko Ota

Shinichiro Seki

Singo Ueda

Chiaki Tsukamoto

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.

Production of biaxially stretched film of polyamide blend

A hot melt adhesive which comprises a copolyamide consisting essentialy of (1) .epsilon.-caprolactam, (2)(a) hexamethylenediamine and (b) at least one straight chain, saturated aliphatic dicarboxylic acid having 6 to 20 carbon atoms in a substantially equimolar ratio and (3)(a) at least one of 2,2,4-trimethylhexamethylenediamine and 2,4,4-trimethylhexamethylenediamine and (b) at least one straight chain, saturated aliphatic dicarboxylic acid having 6 to 20 carbon atoms in a substantially equimolar ratio, the proportion of [A] the constituent unit essentially consisting of the component (1), [B] the contituent unit essentially consisting of the components (2)(a) and (2)(b) and [C] the constituent unit essentially consisting of the components (3)(a) and (3)(b) therein being within a pentagon circumscribed by the lines connecting the points P (82/17/1), Q (52/47/1), R (0/65/35), S (0/50/50) and T (86/7/7) in the graph as shown in FIG. 1 of the accompanying drawing (the numerals in the parenthesis following P, Q, R, S and T indicating the molar percentages of the constituent units [A], [B] and [C], respectively).

Hot melt adhesives comprising copolymeric polyamides

A block copolymer of 99.8 to 90 % by weight of a polyamide segment and 0.2 to 10 % by weight of a polyether segment dispersed in an island state of not more than about 10 .mu. in particle size, the polyamide segment comprising at least one diamine component containing 100 to 50 mol % (preferably 100 to 70 mol %) of m-xylylenediamine or its mixture with p-xylylenediamine and at least one dicarboxylic acid component containing 100 to 50 mol % (preferably 100 to 70 mol %) of at least one aliphatic dicarboxylic acid having 6 to 12 carbon atoms, the polyether segment comprising at least one polyether having a molecular weight of 2,000 to 20,000 and an amino group or a carboxyl group at at least one terminal position thereof and the block copolymer having a scattering index of not less than 1.

Block copolymer of polyamide and polyether, and its preparation and use

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Otsu, Japan

Kaoru Furukawa