Stock material or miscellaneous articles – Composite – Of polyester
Reexamination Certificate
1999-05-25
2001-08-14
Chen, Vivian (Department: 1773)
Stock material or miscellaneous articles
Composite
Of polyester
C428S421000, C428S483000, C428S522000, C430S523000, C430S531000, C430S533000, C430S534000, C430S535000, C430S542000
Reexamination Certificate
active
06274247
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a low-heat-shrinkage film, and particularly to a low-heat-shrinkage polyester film. The present invention also relates to a low-heat-shrinkage heat-development photographic light-sensitive material using the film as a support.
BACKGROUND OF THE INVENTION
Hitherto, for a silver halide photographic light-sensitive material, a wet development has been applied using a developing solution after photographing. However, the method has the following inconveniences, and improvement has been desired.
[1] Because development, bleaching, fixing, and drying are carried out, a long time is required for the development processing.
[2] Because plural tanks containing a developing solution are required, a processor cannot be made small in size and light in weight.
[3] Inconveniences, such as the replenishment of a developing solution, the disposal of processing liquids, washing of developing tanks, etc., are required.
As described in the above, since a silver halide photographic light-sensitive material has been subjected to a complicated processing, some users have not been able to use it.
In order to improve that, photographic light-sensitive materials that are processed using a development method by heating (hereinafter, referred to as “heat development”) to a temperature of from 80 to 150° C. are proposed, as described in, for example, the specification of U.S. Pat. No. 3,152,904, the specification of U.S. Pat. No. 3,457,075, JP-B-43-4921 (“JP-B” means an examined Japanese patent publication), and JP-B-43-4924. One example is a method of previously incorporating a precursor for a developing agent in a light-sensitive layer, decomposing the precursor by heating, to form a developing agent, and subjecting to development. In such a heat-development system, the development processing may be carried out by only applying heat, whereby the processing can be carried out in a short time and a processor can be small in size. Furthermore, the system has such characteristics that there are no inconveniences with the replenishment and the disposal of a developing solution.
However, when the light-sensitive material of this system was applied to a printing light-sensitive material, when 4 plates (blue, green, red, and black plates) were piled up, there was a problem that color discrepancy and distortion of an image were caused by the dimensional change that occurred during heat development. To solve the problem, a method of heat treating under a low tension is disclosed in JP-A-8-211547 (“JP-A” means unexamined published Japanese patent application). However, this method did not cause any problem of dimensional distortion when applied to a small-size plate of 45 cm or less, but a dimensional distortion occurred when it was applied to a larger-size plate exceeding the above size. Further, when the light-sensitive material according to the method was stored after heat development, with the lapse of time color discrepancy occurred as a result of the dimensional distortion. Therefore, this method also has a disadvantage in dimensional stability during storage, and there has been a need to solve the problem.
Further, in the above conventional methods, there is a problem that color discrepancy occurs as a result of dimensional change occurring immediately after a heat development, i.e., within three (3) hours after the heat development. This problem is especially serious in the production of a newspaper, in which exposure, development, and printing are conducted in a short time, and solution of the problem has been demanded.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a low-heat-shrinkage polyester support excellent in dimensional stability. Another object of the present invention is to provide a heat-development photographic light-sensitive material that is excellent in dimensional stability during both heating and storage, and that is also capable of preventing from distortion of an image and color discrepancy.
Still another object of the present invention is to provide a low-heat-shrinkage film excellent in dimensional stability. Further another object of the present invention is to provide a heat-development photographic light-sensitive material having the film as a support.
Other and further objects, features, and advantages of the invention will appear more fully from the following description.
DETAILED DESCRIPTION OF THE INVENTION
That is, according to the present invention there are provided the following means:
(1) A polyester support, which has the dimensional change with the lapse of time after heating which corresponds to heat development, in a range of from −0.03% to +0.05% both in the longitudinal (machine) direction and the transverse (width-wise) direction;
(2) The polyester support as stated in the above (1), wherein the absolute value of a difference between the maximum and the minimum of the dimensional change with the lapse of time after heating which corresponds to heat development, that is measured along the transverse direction, is in a range of from 0% to +0.04% both in the longitudinal direction and the transverse direction;
(3) The polyester support as stated in the above (1) or (2), wherein the thermal dimensional change due to heating, which corresponds to heat development, is in a range of from −0.04% to +0.04% both in the longitudinal direction and the transverse direction;
(4) The polyester support as stated in the above (1), (2), or (3), wherein the absolute value of a difference between the maximum and the minimum of the thermal dimensional change due to heating, which corresponds to heat development, that is measured along the transverse direction, is in a range of from 0% to 0.04% both in the longitudinal direction and the transverse direction;
(5) The polyester support as stated in any one of the above (1) to (4), wherein the polyester support is subjected to heat treatment, so that the polyester shrinks in the longitudinal direction and stretches in the transverse direction, and also that the stretch in the transverse direction is completed before the completion of the shrinkage in the longitudinal direction;
(6) The polyester support as stated in the above (5), wherein the polyester is shrunk by the heat treatment in a range of from −2% to −0.2% in the longitudinal direction, compared to the polyester before the treatment, and the time necessary to complete the shrinkage is in a range of from 15 sec to 5 min;
(7) The polyester support as stated in the above (5), wherein the polyester is stretched by the heat treatment in a range of from more than 0% to +0.4% in the transverse direction, compared to the polyester before the treatment, and the time necessary to complete the stretch is in a range of from 5 sec to 20 sec;
(8) The polyester support as stated in the above (5), (6), or (7), wherein the heat treatment is carried out at a temperature of from 140° C. to 200° C. in a time of from 15 sec to 5 min;
(9) The polyester support as stated in any one of the above (5) to (8), wherein a ratio of the maximum to the minimum in the transverse direction of a thermal dimensional change amount at 120° C. for 30 sec is in a range of from 1 to 1.4 both in the longitudinal direction and the transverse direction, in terms of the polyester support before subjected to the heat treatment (the raw film); and
(10) A heat-development photographic light-sensitive material, which comprises the polyester support as stated in any one of the above (1) to (9), having coated thereon a silver halide photographic light-sensitive layer, wherein a dimensional change after heat development with the lapse of time is in a range of from −0.03% to +0.07% both in the longitudinal direction and the transverse direction (herein, the polyester supports stated in the above (1) to (9) and the heat-development photographic light-sensitive material stated in the above (10) are combined and referred to as a first invention of the present invention
Hashimoto Kiyokazu
Nishikawa Sumio
Burns Doane , Swecker, Mathis LLP
Chen Vivian
Fuji Photo Film Co. , Ltd.
LandOfFree
Low-heat-shrinkage polyester support and heat-development... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low-heat-shrinkage polyester support and heat-development..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-heat-shrinkage polyester support and heat-development... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2550782