Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Structurally defined
Reexamination Certificate
2000-08-30
2001-05-15
Schilling, Richard L. (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Structurally defined
C430S533000, C428S480000
Reexamination Certificate
active
06232054
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a polyester support having excellent cutting property, particularly a polyethylene naphthalate-type support, and also relates to a silver halide photographic light-sensitive material using the support.
BACKGROUND OF THE INVENTION
Silver halide photographic light-sensitive materials (hereinafter sometimes referred to as a “light-sensitive material”) using a polyester support are described in JP-A-6-035118 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”), JP-A-11-202445, JP-A-11-202446 and the like. However, using such a light-sensitive material, when a brownie or 135 light-sensitive material was manufactured and subjected to a series of processing at a processing laboratory (lab) cutting failure occurred with use of a cutter fixed to a mini-lab, a splicer or a mounter for reversal. This is attributable to the fact that the cutter is fitted to conventional TAC (triacetyl cellulose) supports which are very easy to cut, and therefore, encounters difficulty in cutting a polyester support having high mechanical strength and poor cuttability.
With an attempt to solve this problem, JP-A-10-293381 discloses a method of anisotropically stretching the polyester support (2 times or less in MD and from 2.5 to 6 times in TD). Nevertheless, the cutting failure still occurs, moreover, the polyester support cannot be cut straight in TD and cutting eats even into the image. These problems are generated particularly when the core set curl is strong.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a polyester support having excellent cutting property and a silver halide photographic light-sensitive material using the support.
The object of the present invention can be attained by (1) to (13) below.
(1) A polyester support having a tear strength in the transverse direction (TD) of 10 to 100 g, a break strength in TD of 10 to 40 Kg/mm
2
, a break strength in the machine direction (MD) of 2 to 25 Kg/mm
2
and a thickness unevenness in MD of 0 to 8 &mgr;m.
(2) The polyester support as described in (1), wherein the elongation at break in TD is from 20 to 140% and the elongation at break in MD is from 10 to 180%.
(3) The polyester support as described in (1), wherein the tear strength ratio between MD and TD (MD/TD) is from 1.2 to 10.
(4) The polyester support as described in (1) or (2), wherein the core set curl in MD is from 30 to 140 m
−1
.
(5) The polyester support as described in (1), wherein the thickness unevenness in TD is from 0 to 8 &mgr;m.
(6) The polyester support as described in (1), wherein the generation ratio of delamination is from 0 to 75% each in TD and MD.
(7) The polyester support as described in (1), wherein the ratio of modulus between TD and MD (MD/TD) is from 1.2 to 6.
(8) The polyester support as described in (1), wherein the ratio of elongation at break between MD and TD (TD/MD) is from 1.2 to 10.
(9) The polyester support as described in any one of (1) to (4), wherein the total light transmittance is from 70 to 98%, the haze is from 0 to 2% and the thickness is from 90 to 150 &mgr;m.
(10) The polyester support as described in any one of (1) to (9), which consists of a dicarboxylic acid residue comprising from 65 to 95 mol % of a naphthalene dicarboxylic acid residue and from 5 to 35 mol % of an aliphatic and/or aromatic dicarboxylic acid residue having from 3 to 15 carbon atoms, and a diol residue comprising from 65 to 100 mol % of an ethylene crlycol residue and from 0 to 35 mol % of a HO—{(CH
2
)
n
O}
m
—H (wherein n is an integer of 3 to 6 and m is an integer of 2 to 30) and/or H—(OCH
2
CH
2
) n—O—B—R—B—O(CH
2
CH
2
O)
m
—H (wherein n and m, which may be the same or different, each is an integer of 1 to 3, R represents —O—, —S—, —CH
2
— or —C(CH
3
)
2
—, and B represents a benzene ring) residue.
(11) The polyester support as described in any one of (1) to (10), which is sequentially stretched in MD to from 1.0 to 3.0 times and in TD to from 3.0 to 5.0 times and then heat set to have a heat of crystal fusion of 30 to 60 J/g.
(12) The polyester support as described in any one of (1) to (11), which is heat-treated at a temperature in the range from 50° C. to the glass transition temperature (Tg) of the polyester.
(13) A rolled silver halide photographic light-sensitive material using the support of (1) to (12) and wound along MD.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a polyester-type support which is rendered easy to cut by imparting it specific break strength in addition to tearing property. In the present invent-Lon, the tear strength in TD is preferably from 10 to 100 g, more preferably from 20 to 80 g, still more preferably from 20 to 60 g. The ratio of tear strength between the machine direction and the transverse direction (MD/TD) is from 1.2 to 10, preferably from 1.5 to 8, still more preferably from 1.7 to 6, whereby the cutting property is improved.
The break strength in TD is preferably set to an appropriate strength range. If the strength is too low, the support may be cut during the transportation within a camera, whereas if it is too high, cutting failure may occur at the lab. Accordingly, the break strength is from 10 to 40 Kg/mm
2
, more preferably from 15 to 35 Kg/mm
2
. With this break strength, the elongation at break is preferably from 20 to 140%, more preferably from 30 to 110%, still more preferably from 40 to 90%. The ratio of the elongation at break (MD/TD) is preferably from 1.2 to 5, more preferably from 1.2 to 4, still more preferably from 1.2 to 3.
The break strength in MD is preferably from 2 to 25 Kg/mm
2
, more preferably from 4 to 20 Kg/mm
2
, still more preferably from 7 to 18 Kg/mm
2
.
With this break strength, the elongation at break is preferably from 10 to 180%, more preferably from 20 to 140%, still more preferably from 30 to 90%. The core set curl in MD is from 30 to 140 m
−1
, more preferably from 40 to 130 m
−1
, still more preferably from 50 to 120 m
−1
, so that the light-sensitive material can be prevented from sliding below the cutter blade to cause cutting failure.
The thickness unevenness in MD is from 0 to 8 &mgr;m, more preferably from 0 to 6 &mgr;m, still more preferably from 0 to 5 &mgr;m, whereby the linearity at the cutting can be improved. The thickness unevenness in TD is from 0 to 8 &mgr;m, more preferably from 0 to 6 &mgr;m, still more preferably from 0 to 5 &mgr;m, whereby the linear cutting property can be more improved.
The polyester support preferably has a total light transmittance of 70 to 98%, more preferably from 80 to 96%, still more preferably from 86 to 95%. The haze is preferably from 0 to 2%, more preferably from 0 to 1.5%, still more preferably from 0 to 1%.
In the polyester support, the generation ratio of delamination is from 0 to 75% in both MD and TD, more preferably from 0 to 60%, still more preferably from 0 to 50%.
The ratio of modulus between TD and MD (TD/MD) is preferably from 1.5 to 6, more preferably from 1.8 to 5, still more preferably from 1.6 to 4.
The support satisfying these conditions can be achieved as follows.
The polyester support is constructed by raw materials of a dicarboxylic acid and a diol. In the polyester support of the present invention, the dicarboxylic acid comprises a 2,6-naphthalenedicarboxylic acid component in an amount of 65 to 95 mol %, preferably from 70 to 95 mol %, and as another copolymerization dicarboxylic acid component other than the 2,6-naphthalenedicarboxylic acid, an aliphatic and/or aromatic dicarboxylic acid component having from 3 to 15 carbon atoms in an amount of 5 to 35 mol %, preferably from 5 to 30 mol %. Preferred examples of the dicarboxylic acid component other than 2,6-naphthalenedicarboxylic acid include ester formation products of adipic acid (AA), terephthalic acid (TPA), isophthalic acid (IPA), (1,5-, 1,4-, 2,7-)naphthalenedicarboxylic acid (NDCA) and paraphenylenedicarboxylic acid (PPDC).
The diol component comprises an ethylene glycol (EG) component in
Hashimoto Kiyokazu
Okutu Toshimitu
Fuji Photo Film Co. , Ltd.
Schilling Richard L.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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