Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1996-06-28
1998-07-14
Dye, Rena L.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
428 349, 428212, 264510, 264512, 293102, 293110, 293120, B60R 1902, B32B 702, B32B 704
Patent
active
057801290
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a multi-layer blow-molded article having hollow structure made by a blow molding technique using a plurality of thermoplastic resins as raw materials.
BACKGROUND ART
Various techniques are known by which multi-layer, hollow-structure molded articles are made of a plurality of thermoplastic resins of raw materials. Needless to say, the primary object of making multi-layer molded articles is generally to provide an article having different features of individual materials. For example, this means to provide a molded article which is outstanding in both physical properties A and B by means of laminating a resin (a) that is superior in property A but is inferior in property B, and a resin (b) that is superior in property B but is inferior in property A.
In order to cope with such requirements, multi-layer blow-molding techniques have been developed. For example, much attention has been focused on, especially automobile fuel tanks as large industrial parts. Many proposals have been made on methods and machines for producing them as in Japanese Patent Publication Nos. 52-37026 (1977) and 57-53175 (1982). At present, multi-layer blow-molded fuel tanks as products come into actual use in some automobiles. Other examples of the multi-layer blow-molded articles are containers for mayonnaise and ketchup consumed in general homes. In the production of such containers, a parison is formed in such a manner that a plurality of resin layers are positioned concentrically and that each layer has a generally equal thickness over its entire circumference.
Also known are multi-layer blow-molded articles made of parisons each of which has the different number and thickness of layers partially. For example, Japanese Patent Laid-open No. 2-88214 (1990) discloses a multi-layer blow-molded plastic article made of a multi-layer parison in which a-part of the parison is different in the number and thickness of layers from the other part of the parison. In the example of the patent, a trilayer parison is disclosed in which the outer layer is preferably made of a composition comprising crystalline polyolefin and engineering plastic or a thermoplastic, elastomeric, polyolefin composition, the intermediate layer is preferably a reprocessed-material layer comprising, e.g., flash formed in the production of multi-layer blow-molded articles and defective moldings or a foamed-material layer comprising polyolefin or the reprocessed material mentioned above, and the inner layer is preferably made of crystalline polyolefin.
In addition, Japanese Patent Laid-open No. 4-14427 (1992) discloses a method of producing multi-layer blow-molded articles using a parison in which approximately half of the parison in the circumferential direction is made of a material for reinforced portions and the remaining part is made of a material for external portions or approximately half of the parison in the circumferential direction is made of a material for reinforced portions and the remaining part is made of a laminate consisting of a material for reinforced portions and a material for external portions. However, in a multi-layer blow-molded article produced by such a method, the layers-are generally adhered to each other by means of adhesives or fusing so that the layers will not separate from each other.
In this respect, Japanese Patent Laid-open No. 2-88214 (1990), for example, discloses a multi-layer blow-molded article in which the outer layer is made of a composition comprising crystalline polyolefin and engineering plastic or a thermoplastic, elastomeric, polyolefin composition, the inner layer is made of crystalline polyolefin, and the intermediate layer is a reprocessed material comprising, e.g., flash formed in the production of the multi-layer blow-molded article itself and defective moldings or a foamed-material layer comprising polyolefin or the reprocessed material mentioned above, whereby there is provided affinity between the layers due to the common polyolefin component present in all the la
REFERENCES:
patent: 3798103 (1997-03-01), Gaunt
patent: 4870736 (1989-10-01), Kacalieff
Dye Rena L.
Nippon Steel Chemical Co. Ltd.
Nippon Steel Corporation
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