Toyo Seikan Kaisha, Ltd.

Toyo Seikan Daisha, Ltd.

Tetsuo Miyazawa

Katsuhiro Imazu

Seishichi Kobayashi

Masanori Aizawa

Sachiko Machii

Hiroshi Ueno

Toshio Sue

Kazuhiro Sato

Yoshitsugu Maruhashi

Kazuo Taira

Makoto Horiguchi

Tatsuo Mori

Kenichirou Nakamaki

Susumu Takahashi

Nobuyuki Satoh

Yoshiki Takesue

Masashi Ichishima

Yasuji Nakamura

Kouji Suzuki

Norimasa Maida

Yasufumi Tadaki

Hiroko Hosono

Kazuhiro Satoh

Kenichiro Nakamaki

A laminate obtained by laminating a resin composed chiefly of a polyester on a base material, said resin layer having a melt viscosity ratio (R) defined by the following formula (1),

Laminate and container made of the same

A laminate for can-making is disclosed, comprising a metal sheet and a thermoplastic resin layer provided on the surface of the metal sheet. The thermoplastic resin layer comprises a laminate film layer comprising a polyester-base resin intermediate layer (A) containing 10 wt % or more of coloring agent particles, a polyester-base resin outer surface layer (B) and a polyester-base resin backing layer (C). The outer surface layer (B) and the backing layer (C) each contains the coloring agent particles in an amount of 20 wt % or less and at the same time, in an amount less than that contained in the intermediate layer (A). Also disclosed is a process for making a can using the laminate.

Laminate sheet and process for making a seamless can using the same

The present invention is a packaging material composed of a thermoplastic polyester as a constituent material. By adjusting the contents of a dibasic carboxylic acid and its oligomer derived from the polyester to 500 ppm or less, and adjusting sodium to 6 ppm or less and all alkali metals to 30 ppm or less, especially 20 ppm or less, the flavor retention of the packaging material can be markedly increased.

Packaging material having excellent flavor retention

A thin-walled, deep-draw-ironed seamless can comprising a laminate of a metal sheet and a biaxially stretched film of polyester or copolyester mainly comprising an ethylene terephthalate unit. The thickness of the side wall portion of the can is reduced to from 30 to 85% of the original thickness of the laminate. The film layer on the side wall portion of the can has a parallel component orientation (D1) defined by formula (1) of 65% or more and a half width (Wh) of the peak at an angle of diffraction 2.theta. of from 14.degree. to 20.degree. falling within 1.8.degree..

Seamless can

A laminated metal sheet obtained by laminating a polyester film on a metal sheet, wherein the polyester film has a double refraction represented by the following relation,

Polyester-metal laminated sheet and seamless cans using the same

A laminated draw-formed container that is obtained by draw-forming a laminated material of a metal plate on which a resin film is laminated into a cup having bottom, wherein said resin film comprises a surface layer of a high molecular oriented copolymerized polyester derived from acid components of 85 to 97% of terephthalic acid and 3 to 15% of isophthalic acid, and a diol component, and a lower layer of a low molecular oriented copolymerized polyester (B) derived from acid components of 84.5 to 96.5% of terephthalic acid and 3.5 to 15.5% of isophthalic acid, the amount of the isophthalic acid being larger than that of the copolymerized polyester (A) of the surface layer, and a diol component, and said surface layer having a double refraction method orientation degree (.DELTA. n) as represented by the following relation,

Laminated draw-formed container having excellent flavor-retentivity and

A laminated sheet metal for the manufacture of containers is made from a sheet metal and, a layered thermoplastic resin film wherein the primer resin includes from about 50 to about 98 weight percent of polyamidodicarboxylic acid-modified epoxy resin, from about 2 to about 50 weight percent of curing agent resin, and from about 0.05 to about 10 weight percent of curing catalyst; also disclosed is a primer resin composition for use in the manufacture of laminated sheet metal for use in the manufacture of containers, made from about 50 to about 98 weight percent of polyamidodicarboxylic acid-modified epoxy resin, from about 2 to about 50 weight percent of curing agent resin, and from about 0.05 to about 10 weight percent of curing catalyst.

Laminated sheet metal for container manufacture and primer used in

A laminated draw-formed container obtained by draw-forming a laminated material of a metal plate on which a resin film is laminated into a cup with bottom, wherein the resin film comprises a polyester composition which contains a polyethylene terephthalate component as a chief component and further contains a polyethylene isophthalate component and a polybutylene terephthalate component, the resin film having a density of from 1.32 to 1.39 g/cc at any part of the container and further having, on the upper part of the container, a trans ratio of ethylene glycol residue of from 0.1 to 1.5 as found by the ATR method, as well as a process for producing the container. The draw-formed container exhibits excellent shock resistance irrespective of the passage of time, and particularly dent resistance and barrier property against corrosive components, as well as intimate adhesion to the metal substrate.

Laminated draw-formed container having excellent shock resistance and

Process for preparation of thickness-reduced deep-draw-formed can

Thickness-reduced deep-draw-formed can

Disclosed is a laminated metal plate for a drawn can, which comprises a laminate comprising a base metal, a layer of a film of a polyester composed mainly of ethylene terephthalate units and, if desried, an adhesive primer layer interposed between the base metal and the polyester film layer, wherein the X-ray diffraction intensity ratio, defined by the following formula (I), of the polyester film layer is in the range of from 0.5 to 15:

Laminated metal plate for drawn can, and drawn can prepared therefrom

Disclosed is a process for the production of a covered deep-drawn can, which comprises subjecting a metal sheet covered with a thermoplastic resin to drawing and deep-drawing. By heat-treating the formed covered deep-drawn can at a temperature higher than the glass transition point of the thermoplastic resin covering but lower than the melting point of the thermoplastic resin covering, the corrosion resistance, heat resistance and denting resistance of the can are improved, and the adhesion of the resin covering to the metal sheet and the heat resistance of the resin covering to the metal sheet and the heat resistance of the resin covering are improved without degradation of film characteristics inherently possessed by the resin covering.

Process for production of covered deep-drawn can

A process for producing an epoxy-type lacquer, which comprises reacting a liquid epoxy resin having about one bisphenol A skeleton on an average in the molecular chain and derived from bisphenol A and an epihalohydrin, with bisphenol A in the presence of a catalyst in an inert organic solvent to prepare a concentrated solution of an epoxy resin having a number average molecular weight of from 2,000 to 10,000, adding an organic solvent to the concentrated solution to dilute it and maintain it at a temperature lower than that at which the catalyst is active, and mixing the resulting diluted solution with a solution of a resin acting as a curing agent for the epoxy resin. The resulting lacquer is especially useful for coating metallic containers.

Process for producing epoxy-type-lacquer

Disclosed is a side seam-coated welded can comprising a welded can body having a seam on the side face and a resin coating layer covering at least one surface side of the seam, wherein said coating layer comprises a thermosetting resin and a thermoplastic resin having a softening point of 50.degree. to 300.degree. C. as determined according to the ring and ball method, at a volume ratio ranging (A) from 95/5 to 25/75 or (B) from 20/80 to 1/99, and one of said two resins is present in the coating in the form of a continuous phase and at least a part of the other resin is present in the coating in the form of fine dispersed particles. This can is excellent in corrosion resistance and processability.

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Ayase, Japan

Tetsuo Miyazawa