Daikin Industries, Ltd.

Masakatsu Kitano

Takeshi Inaba

Tetsuo Shimizu

Takafumi Yamato

Yoshihisa Yamamoto

Hirofumi Nishibayashi

The present invention is to provide a method of producing multilayer laminates comprising a polyamide and a fluorine-containing ethylenic polymer laminated together and being excellent in interlayer adhesion strength by multilayer coextrusion in an easy and simple manner without need of any additional step or without being limited to some or other particular adhesive material. The present invention is a production method of a multilayer laminate which comprises laminating at least a polyamide (A) and a fluorine-containing ethylenic polymer (B) by simultaneous multilayer coextrusion using a coextrusion apparatus to obtain the laminate comprising said polyamide (A) and said fluorine-containing ethylenic polymer (B), said coextrusion apparatus comprising a die and a plurality of extruders for feeding resins to said die, and the temperature of said die being set within the range exceeding 260&#xb0; C. but not higher than 310&#xb0; C.

Process for producing multilayered product

In a thermoplastic resin laminate having at least three thermoplastic resin layers, wherein an intermediate layer interposed between a first layer of a thermoplastic resin A and a second layer of a thermoplastic resin B which are not bonded each other, is a thermoplastic resin composition which contains as a main component a thermoplastic resin A having a bonding property to the thermoplastic resin A and a thermoplastic resin B having a bonding property to the thermoplastic resin B and forms a dispersion structure, wherein the thermoplastic resin A forms a continuous phase and the thermoplastic resin B forms a dispersed phase in the intermediate layer at the vicinity of the interface between the intermediate layer and the first layer, and wherein the thermoplastic resin B forms the continuous phase and the thermoplastic resin A forms the dispersed phase in the intermediate layer at the vicinity of the interface between the intermediate layer and the second layer, the first layer and the second layer are firmly bonded by the intermediate layer.

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Toyonaka, Japan

Masakatsu Kitano