Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-09-22
1994-05-31
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
215355, 215358, C08K 1100, B65D 3900, B65D 3912
Patent
active
053170474
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a composition adapted to be used in particular for manufacturing stoppers, and to its process for manufacture.
The technical domain of the invention is that of the cork industry.
Much research has been made for developing compositions whose properties are close to those of natural cork and which enable it to be replaced, particularly for the manufacture of stoppers, for example stoppers intended for closing wine bottles.
In fact, the harvesting of cork is limited to a few regions in the world where cultivation of corkoaks is economically viable, and the production of natural cork hardly responds to the needs.
Such research has led to manufacturing stoppers of cork agglomerate constituted by particles of cork and a binding agent or glue which ensures cohesion of the stopper.
Unfortunately, the cork agglomerate does not present the same characteristics as natural cork, which means that the cork agglomerate stoppers are used only for the conservation of wines of lesser quality which are not intended to age in the bottle.
The natural cork which serves for the conventional manufacture of stoppers also has shortcomings: in fact, depending on the quality of the natural cork with which it is made, the stopper obtained presents defects often visible to the naked eye or in the form of large cavities, which may be the cause of defective tightness and which are sometimes filled with cork powder in order to improve the stopper's appearance and to overcome these defects in tightness; furthermore, this disparity in quality has led the manufacturers to distinguish about six classes of quality of stoppers; in addition, certain stoppers in low-quality natural cork give the wine with which they are in prolonged contact, undesirable tastes.
It has also been attempted to manufacture entirely synthetic stoppers, particularly based on polyurethane or other plastics materials.
Canadian Patent Application 1 177 600 (PAISLEY et al) describes and claims a method of manufacturing stoppers of plastics material (such as an ethylene-vinyl acetate copolymer) by moulding.
U.S. Pat. 4 042 543 (STRICKMAN et al) describes a composition for the manufacture of stoppers, which comprises polyethylene or ethylene vinyl acetate copolymer mixed with particles of natural cork; production of this composition includes an operation of heating at about 250.degree. C., allowing fusion of the copolymer.
Other documents describe products and processes which attempt to overcome the shortcomings of natural cork stoppers, such as for example Patent Application DE 2 910 692 (PFEFFER KORN) which describes and claims stoppers for bottles which comprise a capsule made of an absolutely gas-tight material, for example a metal capsule; this method presents the particular drawback of preventing the wine from ageing due to this perfect tightness.
All known stoppers, their processes of manufacture and their composition therefore present drawbacks.
The problem raised is therefore that of providing a composition, its process of manufacture and its use for the manufacture of stoppers, particularly for wine bottles, which maintain the advantages of natural cork, which therefore present similar physical characteristics, without being penalized by the drawbacks associated with the disparity in quality of these stoppers, and which enables stoppers and other products using this composition to be obtained, which present an outer appearance very similar to natural cork and which do not present the drawbacks of known synthetic stoppers, particularly their lack of elasticity, their too perfect tightness to gas, their outer appearance different from natural cork.
One solution to the problem raised consists in producing a composition principally constituted by particles of ligneous plant matter, a plastics material of closed cellular structure and a binding agent, and such that the mean dimension of the cells of said closed cellular structure is less than 1 millimeter and said mean dimension is preferably included between 10 microns and 200 microns,
REFERENCES:
patent: 4042543 (1977-08-01), Strickman et al.
patent: 4188457 (1980-02-01), Throp
Patent Abstracts of Japan, vol. 4, No. 6(C-9)(543) May 8, 1980 and JP,A.55029550 (Dainippon Ink Kagaku Kogyo K.K. Mar. 1, 1980.
Japanese Patents Gazette Section Ch, Week C45, Dec. 17, 1980, Derwent Publications Ltd., London, GB; Class A, p. 18, AN80035 C/45 and JP,A,55125129 (Kanegafuchi Chem. K.K.) Sep. 26. 1980.
Jeanty Gerard
Masse Joel
Sabate Bernard
Bouchons A Champagne Sabate, S.A.
DeWitt LaVonda
Michl Paul R.
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