Surface-coated vessel and process for producing same

Details Surface-coated vessel and process for producing same Surface-coated vessel and process for producing same

1996-09-20

1997-12-02

Lesmes, George F.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

427517, 427519, 522 16, B29D 2200, C08F 250

Patent

active

056933908

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/JP96/00163 filed Jan. 29, 1996.


FIELD OF THE INVENTION

The present invention relates to a resin composition for hard coating for producing a hard coat on a substrate, such as a resin molded product, to coated products with such a hard coat, to a surface-coated vessel made of a resin based on polyester on which such a hard coat is formed and to a process for producing the surface-coated vessel. In particular, the present invention relates to a resin composition for hard coating which can afford to build up a hard coat exhibiting superior properties, such as surface hardness, resistance to scratch, abrasion resistance, flexibility, surface gloss, heat resistance, water resistance, resistance to solvent, resistance to alkali, weather resistance and tight adhesion, to coated products, to a surface-coated vessel, such as a returnable bottle intended for reuse, and to a process for producing such a surface-coated vessel.


BACKGROUND OF THE INVENTION

Resin molded articles made of a thermoplastic resin or a thermosetting resin are not only superior in the impact strength with light-weighing but also possessed of various advantages, such as low costs and ease in the production, as compared with products of metals and glasses, so that they are used widely in the place of metal and glass products in various fields including parts and accessories of automobile and autocycle, domestic electrified products and household goods of daily use. However, resin molded articles have, in general, lower surface hardness and are subject to damage by scratch and abrasion leaving surface flaws, as compared with products of metals and glass.
Vessels of resins based on polyester, such as polyethylene terephthalate (PET), are not only low-priced and easy in their production, but also light weighing and superior in the impact strength and in impermeability for gases and can be processed easily by, for example, molding etc., so that they are now in wide use for vessels of food products, such as drink bottles. However, vessels of a resin based on polyester exhibit lower surface hardness and lower resistance against scratch and abrasion, leaving easily surface flaws, as compared with vessels made of metals and glass.
For remedying these disadvantages, a technique has been incorporated in order to improve the material properties, such as surface hardness etc., of resin products, in which the surface of the resin substrate is provided with a hard coat. As a resin composition for hard coating of this kind in the prior art, Japanese Patent Kokai Sho 59-25840 proposes a resin poly(meth)acrylated polyoxyalkanepolyol, a photopolymerization initiator, for example, 1-(4-isopropylphenyl)-2-hydroxy-2-methyl-1-propanone, and an inorganic filler, such as silica powder.
When a resin molded product is coated with such a resin composition for hard coating and a hard coat is produced on the resin substrate of the molded product, the hardening characteristic upon the curing of the coating layer in the air is excellent and the resulting hard coat exhibits superior coating properties, such as surface hardness, resistance to scratch and abrasion, flexibility, surface gloss, heat resistance, water resistance, resistance to solvents, weather resistance and tight adhesion on the substrate. In some cases, however, there is a further requirement in accordance with the specific use of the product that a hard coat exhibiting excellent coating properties, in particular, with respect to the surface hardness, resistance to alkali and so on is obtained. Especially, when a surface-coated vessel is used for a returnable vessel, such as returnable bottle, improved coating properties, such as surface hardness and weather resistance, are requested so as to meet the condition for collecting and reclamative processing thereof including washing procedure for preparing for reuse of the used-up and collected vessel, in addition to a higher resistance to alkali so as to withstand the alkali washing condition.
An object of the present invention

REFERENCES:
patent: 4515836 (1985-05-01), Cobbs, Jr. et al.
patent: 4526920 (1985-07-01), Sakashita et al.
patent: 4569869 (1986-02-01), Kushida et al.
patent: 5145885 (1992-09-01), Berner et al.

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