US 5,096,652 AGranted

Method of manufacturing a multilayered molding

AssigneeMitsui Petrochemical Industries, Ltd.

InventorsAkira Uchiyama, Naoaki Jimbo, Shizuo Shimizu

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Abstract

A multilayered molding is disclosed, which has a base molding outer layer mainly composed of a partial crosslinking type substance A obtained from polyolefin resin and ethylene-.alpha.-olefin copolymer rubber or a mixture B of polyolefin resin and ethylene-.alpha.-olefin copolymer rubber or both. The outermost layer is in direct contact with and forms a lamination with an inner intermediate layer or a base molding composed of a polyethylene resin, for instance, and is firmly bonded to the outermost layer. A method of manufacturing such multilayered molding is also disclosed, in which a composite sheet of the thermoplastic elastomer with or without the intermediate layer is preliminarily heated, followed by being suction held in close contact with a mold cavity inner surface, thus forming a surface layer. The mold is then clamped, and fluidized and plasticized polyolein resin is injected to produce the molding. The polyolefin resin may also be injected prior to the clamping.

Claims7

Dependent claims

A method of manufacturing a multilayered molding comprised of a base molding body having a surface layer formed thereon,

said surface layer being comprised of a composite sheet or film formed by laminating (1) an outer layer mainly composed of a thermoplastic elastomer, which is constituted by a partial crosslinking type substance A obtained from polyolefin resin and ethylene-.alpha.-olefin copolymer rubber partial crosslinking type resin, (2) an intermediate foamed layer formed of a flexible polyolefin resin foam body and (3) a protective layer mainly composed of a thermoplastic elastomer selected from a partial crosslinking type substance A obtained from polyolefin resin and ethylene-.alpha.-olefin copolymer rubber or a mixture B of polyolefin resin and ethylene-.alpha.-olefin copolymer rubber partial crosslinking type substance,
wherein said method comprises
preheating the surface layer,
setting the preheated surface layer in a mold having a cavity with an inner surface such that said outer layer (1l) of the preheated surface layer is on the side of the cavity inner surface,
holding the set preheated surface layer in close contact with said cavity inner surface by producing a negative pressure in said cavity,
clamping the mold,
injecting a base molding body forming, fluidized and plasticized polyolefin resin into said cavity, and
manufacturing a multilayered molding, in which the base molding body formed, is integrated with the surface layer formed thereon, in the production of the multilayered molding.

5 more elements

A method of manufacturing a multilayered molding comprised of a base molding body having a surface layer formed thereon,

said surface layer being comprised of a composite sheet or film formed by laminating (1) an outer layer mainly composed of a thermoplastic elastomer, which is constituted by a partial crosslinking type substance A obtained from polyolefin resin and ethylene-.alpha.-olefin copolymer rubber, a mixture B of polyolefin resin and ethylene-.alpha.-olefin copolymer rubber partial crosslinking type resin, (2) an intermediate foamed layer formed of a flexible polyolefin resin foam body and (3) a protective layer mainly composed of a thermoplastic elastomer selected from a partial crosslinking type substance A obtained from polyolefin resin and ethylene-.alpha.-olefin copolymer rubber or a mixture B of polyolefin resin and ethylene-.alpha.-olefin copolymer rubber partial crosslinking type substance,
wherein said method comprises
preheating the surface layer,
setting the preheated surface layer in a mold having a cavity with an inner surface such that said outer layer (1) of the preheated surface layer is on the side of the cavity inner surface,
holding the set preheated surface layer in close contact with said cavity inner surface by producing a negative pressure in said cavity, `injecting a base molding body forming, fluidized and plasticized polyolefin resin into said cavity,
clamping the mold, and
manufacturing a multilayered molding, in which the base molding body formed, is integrated with the surface layer formed thereon, in the production of the multilayered molding.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/593,499Filed 4 Oct 1990 · continuation
Priority: JP 63-1931629 Jan 1988
Granted: 17 Mar 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B32B 5/18
Layered products characterised by the non- homogeneity or physical structure , i.e. comprising a fibrous, filamentary, particulate or foam…
B29C 45/14811
The article consisting of a material with particular properties, e.g. porous, brittle: multilayered articles
B32B 25/08
Comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic…
B32B 27/065
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of foam