Tubular laminate and process for producing the same

Details Tubular laminate and process for producing the same Tubular laminate and process for producing the same

1994-01-25

1997-09-02

Lee, Helen

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 359, 428421, 428422, B29D 2200, B32B 108

Patent

active

056629729

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a tubular laminate of a fluorine-containing resin a process for producing the same.


BACKGROUND ART

A fluorine-containing resin has excellent characteristics such as non-stickiness, stain resistance, heat resistance, chemical resistance, clearness, ultraviolet ray aging resistance, weatherability, and water and oil repelling property, which are not possessed by the other resins. However, the fluorine-containing resin is very difficult to be laminated on the other materials due to its non-sticking characteristic. Therefore, the fluorine-containing resin is not actually widely used in spite of the above-mentioned excellent characteristics. A tubular laminate is not an exception.
Effort to conduct lamination on a fluorine-containing resin molded article has been first directed to modification of a surface of the fluorine-containing resin molded article, and various modification methods have been developed. For example, there are known methods in which an electric discharge treatment such as corona discharge is conducted (JP-B-17485/1962, JP-B-51421/1984, JP-B-54848/1990, JP-A-214620/1984, JP-A-9533/1988, JP-A-218336/1988, JP-A-222838/1988), a method in which a flame treatment or a metallic sodium treatment is conducted (JP-B-10176/1988), a method in which surface roughing treatment is conducted by sand blast, and the like. In most cases, however, sufficient adhesion may not be obtained only by modifying the surface of the fluorine-containing resin. Therefore, an adhesive is used for lamination.
These methods are similarly applied to lamination of a tubular fluorine-containing resin molded article. JP-B-51421/1984 discloses a process for producing a tubular laminate in which after treating an outer surface of an inner layer of the fluorine-containing resin molded article by corona discharge, a rubber-based primer layer is formed on the treated surface, and an unvulcanized rubber sheet is wrapped on the primer layer, then vulcanization is conducted.
For forming the primer layer or the adhesive layer, however, more steps are necessary corresponding thereto. Further, various considerations are required for selection of the adhesive.
The present invention provides a process for producing a tubular fluorine-containing resin laminate without an adhesive layer (a primer layer) and having a strong adhesion to each other.


DISCLOSURE OF THE INVENTION

The present invention relates to a process for producing a tubular laminate which comprises, discharge-treating an outer surface of a tubular fluorine-containing resin molded article in an inert gas atmosphere containing an organic compound having a functional group, extruding a molten resin onto the treated surface, and coating the treated surface with the molten resin.
The preferred embodiments of the present invention are explained hereinbelow:
The fluorine-containing resin used in the present invention is not restricted, provided that a tubular molded article can be produced from the resin. Examples are polytetrafluoroethylene (PTFE) or a modified compound thereof, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoro-propylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-vinylidene fluoride copolymer (TFE/VdF), tetrafluoroethylene-hexafluoro-propylene-perfluoroalkyl vinyl ether copolymer (EPA), polychlorotrifluoroethylene (PCTFE), chlorotrifluoro-ethylene-ethylene copolymer (ECTFE), chlorotrifluoro-ethylene-vinylidene fluoride copolymer (CTFE/VdF), poly(vinylidene fluoride) (PVdF), poly(vinyl fluoride) (PVF), and the like. Among them, PTFE, PFA, FEP, ETFE, PCTFE and PVdF are particularly preferable. The fluorine-containing resin molded article may be either a tubular article itself or a coated layer formed on other tubular substrates, for example, a metallic pipe made of steel, copper, aluminium or the like, a nonmetallic pipe made of glass, cement, resin or the like.
For the surface modification of the fluorine-containing resin molded

REFERENCES:
patent: 3296011 (1967-01-01), McBride et al.
patent: 3472756 (1969-10-01), Punderson
International Search Report in PCT/JP93/00688.
Supplementary European Search Report for Appln No. EP 93 91 0385 mailed May 27, 1994.

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