Stock material or miscellaneous articles – Hollow or container type article – Shrinkable or shrunk
Reexamination Certificate
1999-08-03
2001-08-07
Chen, Vivian (Department: 1773)
Stock material or miscellaneous articles
Hollow or container type article
Shrinkable or shrunk
C428S034900, C428S035700, C428S480000, C428S515000, C428S519000, C428S521000, C156S084000
Reexamination Certificate
active
06270866
ABSTRACT:
TECHNICAL FIELD
The present invention relates to heat shrinkable films for labeling, which are excellent in low temperature heat shrinking properties and UV absorbing properties.
BACKGROUND ART
It is a common practice to apply heat shrinkable films (labels) bearing printing on the internal surface to containers such as plastic containers for exhibiting product names, instructions for use and other information, or for decorative purposes (Japanese Unexamined Patent Publications Nos. 114380/1997 and 272182/1997).
Recently, however, there is remarkable increase in the number of plastic containers having low heat resistance and those made of thin sheets so as to facilitate recycling and decrease pollution caused by waste incineration. On the other hand, aseptic filling is becoming increasingly popular as a technique for filling containers. If a heat shrinkable film (label) is applied to an aseptically filled plastic container having low heat resistance or made of a thin sheet, there arises the problem that the container is markedly deformed when the film (label) is shrunk by the conventional wet heat at about 85 to 90° C. Further, some products need to be labeled at the lowest possible temperature to maintain their quality.
Accordingly, there is a strong demand for heat shrinkable films for labeling which show proper shrinking properties at low temperatures (70 to 84° C.).
Also demanded are low temperature heat shrinkable films for labeling which have UV absorbing properties (UV screening properties) to protect products prone to deterioration, change in quality or discoloration by UV light (such as medicines, foods, refined sake and like drinks, and cosmetics).
An object of the present invention is to provide a low temperature heat shrinkable film for labeling showing proper shrinking properties at low temperatures (70 to 84° C.).
Another object of the invention is to provide a low temperature heat shrinkable film for labeling comprising a specific resin system.
A further object of the invention is to provide a low temperature heat shrinkable film for labeling having excellent UV absorbing properties.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a schematic illustration of a label applied to a container having a fill point, wherein
1
indicates a container;
2
, a filling point;
3
, a label before heat shrinkage;
4
, a label after heat shrinkage; and
5
, the main orientation direction of the film.
FIG. 2
is a diagram showing gradients Y′ satisfying Equations 1, 2, 5 and 6, respectively. The gradient Y′ according to the invention is in the area between the gradients of Equations 1 and 2, more preferably in the area between the gradients of Equations 5 and 6.
FIG. 3
is a diagram showing heat shrinkage percentages Y satisfying Equations 3, 4, 7 and 8, respectively. The heat shrinkage percentage Y according to the invention is in the area between the heat shrinkage percentages of Equations 3 and 4, more preferably in the area between the heat shrinkage percentages of Equations 7 and 8.
FIG. 4
is a correlation diagram showing the gradients Y′ satisfying Equations 1, 2, 9, 10, 11 and 12, respectively.
FIG. 5
is a correlation diagram showing the heat shrinkage percentages Y satisfying Equations 3, 4, 9, 10, 11 and 12, respectively.
FIG. 6
is a chart showing the results of spectrophotometric determination of the transmission of UV light (and a slight amount of visible light) through the film obtained in Example 1.
FIG. 7
is a chart showing the results of spectrophotometric determination of the transmission of UV light through the film obtained by following the procedure of Example 1 with the exception of not using the UV absorber.
REFERENCES:
patent: 4161324 (1992-06-01), None
patent: 5305664 (1993-11-01), None
patent: 8323859 (1996-12-01), None
patent: 9254257 (1997-09-01), None
patent: 9272182 (1997-10-01), None
Abstract of WO99/29490 Jun. 1999.
Kuriu Hiroki
Okuda Tomohisa
Tanaka Hiroyuki
Wada Fusazo
Baker & Botts L.L.P.
Chen Vivian
Gunze Limited
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