Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
2001-01-26
2003-01-28
Chen, Vivian (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S212000, C428S213000, C428S215000, C428S216000, C428S480000, C430S271100, C430S523000, C430S531000, C430S533000
Reexamination Certificate
active
06511738
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a support for rolled light-sensitive photographic materials which can be used for 120 or 135 photographic films, which are widely employed as silver halide photographic films for general purpose cameras.
BACKGROUND OF THE INVENTION
Generally, cited as representative examples of silver halide light-sensitive photographic materials (photographic film) are sheet films such as X-ray film, film for graphic arts, cut film, and roll film. Listed as representative roll film are color film and black-and-white film having a width of 35 mm or less, which are placed in velvet lined cartridges which are loaded in general purpose cameras and employed for general picture taking. In addition, 120 film, having a greater width, may be listed.
Heretofore, cellulose triacetate film (TAC) has been used as the primary support for roll film. TAC film as the photographic support features excellent properties such as no optical anisotropy, high transparency, and residual curl diminishing properties, after photographic processing. Said TAC film is obtained by dissolving cellulose triacetate in organic solvents such as methylene chloride or the like, and casting the resultant solution onto a metal belt and the like, and subsequently drying the resultant film. Said organic solvents, especially chlorine based solvents such as methylene chloride and the like, which are used to dissolve cellulose triacetate, may cause environmental problems.
On the other hand, known as materials which make it possible to form film without employing solvents are polyesters such as polyethylene terephthalate (PET), polyethylene-2,6-naphthalate (PEN), and the like. Generally, a PET film is obtained by melt extruding PET and subsequently biaxially stretching the resultant film. Such PET film has been conventionally employed as a support for X-ray film as well as lithographic film. However, when said PET film is employed as a support for 120 and 135 films, namely is employed in a rolled set, roll set curl tends to occur. As a result, problems occur such as, for example, conveyance problems in the camera, generation of abrasion during the photographic processing as well as the printing process after said photographic processing, which is carried out to form images on a photographic paper, jamming during conveyance, and the like.
As a method to improve recovery properties from said roll set curl, Japanese Patent Publication Open to Public Inspection No. 1-244446 describes a copolymerized PET film provided with hydrophilicity, which is obtained by utilizing an aromatic dicarboxylic acid having a metal sulfonate group as a copolymerization component. Japanese Patent Publication Open to Public Inspection No. 4-93937 describes a technique which maintains recovery properties from roll set curl, as well as enhances the mechanical strength in which polyesters having different moisture contents are laminated.
Further, as techniques to enhance the adhesion between layers of the laminated film, produced by laminating copolyesters, Japanese Patent Publication Open to Public Inspection No. 6-23929 describes a technique in which copolymerization components in the layer which is employed for lamination are noted, Japanese Patent Publication Open to Public Inspection No. 6-289534 describes a technique in which differences in the amount of copolymerization components between laminated layers are noted, and Japanese Patent Publication Open to Public Inspection No. 6-161035 describes a technique in which in one layer, polyester employed in the other layer(s) is blended. Such techniques are preferable since they improve recovery properties from roll set curl, as well as improving mechanical strength and adhesion between layers of a laminated film.
Specifically, the technique described in said Japanese Patent Publication Open to Public Inspection No. 6-161035 is advantageous with the reduction of cost, because general purpose homopolyesters can be employed.
However, said technique is developed while primarily investigating a thin base having a layer thickness of about 80 &mgr;m. By contrast, the thickness of the TAC film employed in 120 and 135 films is about 120 &mgr;m. Though a decrease in film thickness is useful for decreasing the size of cameras and the like, the film thickness is preferably about 120 &mgr;m so that no focusing problem occurs when employed, instead of the commonly used TAC film.
It has been discovered that when the technique described in said patent is simply applied to an approximately 120 &mgr;m thick layer, the roll set curl tends to increase; recovery properties from the roll set curl is somewhat degraded compared to an 80 &mgr;m thick layer; conveyance in processors is degraded, and adhesion between layers is insufficient.
SUMMARY OF THE PRESENT INVENTION
In the foregoing, the present invention is accomplished. An object of the present invention is to provide a support for rolled light-sensitive photographic materials such as 120 and 135 films, which may be produced without using solvents, and to provide a production method thereof.
Namely, by adjusting film thickness from 105 to 130 &mgr;m, provided are rolled light-sensitive photographic materials which can be employed in cameras designed for commonly used 120 and 135 film, without resulting in focusing problems; results in almost no problem of roll set curl tendency even at a film thickness of 105 to 130 &mgr;m; exhibit excellent recovery properties from roll set curl as well as excellent adhesion between layers; and can be used in processors and the like without resulting in any problem.
The aforementioned object of the present invention is achieved employing the embodiments described below.
1. A support for a rolled light-sensitive photographic material comprised of at least three laminated layers, wherein primary component of outer layers is copolyester; at least one interlayer is a mixture layer composed of a mixture of copolyester and homopolyester; the total thickness of the laminated layers is 105 to 130 &mgr;m; the total thickness of interlayers is 45 to 85 &mgr;m; and the ratio of said copolyester in the layer composed of said copolyester and said homopolyester is 10 to 40 percent by weight.
2. The support for a rolled light-sensitive photographic material of item
1
, wherein the copolyester of the primary component of the outer layers and copolyester of the mixture layer contain, as a component of copolymer, at least one aromatic dicarboxylic acid having a metal sulfonate group, and at least one of polyalkylene glycol and polyalkylene oxydicarboxylic acid.
3. The support for a rolled light-sensitive photographic material of item
2
, wherein the copolyester comprises 4 to 10 mole percent of the aromatic dicarboxylic acid component having a metal sulfonate group with respect to the entire ester bonding units, and 2 to 8 percent by weight of at least one of polyalkylene glycol and polyalkylene oxydicarboxylic acid.
4. The support for a rolled light-sensitive photographic material of item
3
, wherein the copolyester comprises 4.5 to 8 mole percent of the aromatic dicarboxylic acid component having a metal sulfonate group with respect to the entire ester bonding units, and 4 to 7 percent by weight of at least one of polyalkylene glycol and polyalkylene oxydicarboxylic acid.
5. The support for a rolled light-sensitive photographic material of item
1
, wherein at least one of copolymerization component of the copolyester, copolymerization ratio and layer thickness is different from each other between the outer layers.
6. The support for a rolled light-sensitive photographic material of item
1
, wherein the mixture layer comprises 10 to 40% by weight of the copolyester substantially same as the copolyester of the primary component of at least one of the outer layers.
7. The support for a rolled light-sensitive photographic material of item
1
, wherein the mixture layer is adjacent to at least one of the outer layers and comprises 10 to 40% by weight of the copolyester substantially same as the copolyester o
Koyama Hirokazu
Shibue Toshiaki
Bierman, Muserlian and Lucas
Chen Vivian
Konica Corporation
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