Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Reexamination Certificate
1997-10-03
2001-05-29
Resan, Stevan A. (Department: 1773)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
C428S327000, C428S341000, C428S411100, C428S473500, C428S474400, C428S500000, C428S908000
Reexamination Certificate
active
06238785
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a thermoplastic resin film permitting excellent paper feed and discharge and excellent transfer of offset printing ink and ink adhesion even under high humidity conditions in the summertime.
2. Description of the Related Arts
An opaque or semitransparent film comprising a single polyolefin film layer containing a fine inorganic powder or a laminate having such a fine inorganic powder-containing polyolefin film layer on at least one side thereof, especially a microporous stretched film, is useful as synthetic paper [JP-B-46-407994 (the term “JP-B” as used herein means an “examined published Japanese patent publication”), U.S. Pat. No. 3,765,999).
Synthetic paper comprising the above-mentioned fine inorganic powder-containing or organic filler-containing thermoplastic resin film has experienced a steadily increasing use over a very broad field, for example, a poster paper, atlas paper, bar code paper, prepaid card base paper, in-mold labels, playing card paper or a support for a heat transfer recording paper, because of its excellent physical properties such as water resistance, toughness and surface smoothness. With its increasing utility, synthetic paper of this type having improved antistatic properties and printability in offset printing or printing with ultraviolet-curing inks is in greater demand than ever.
Because polyolefins per se are non polar and hydrophobic, synthetic paper, particularly, polyolefin synthetic paper does not always-have satisfactory antistatic properties or offset printability, and it is usually subjected to an appropriate surface treatment such as corona discharge treatment, plasma treatment or ozone treatment, to improve these properties.
Among such surface treatments, it is the common practice to apply primer coating with polyethyleneimine or the like subsequent to the corona discharge treatment (U.S. Pat. No. 4,906,526, U.S. Pat. No. 4,420,536, JP-B-43-6676). The above method is however accompanied by the drawbacks that uniform primer coating cannot be obtained, presumably because the corona discharge treatment is inferior in the capacity to make the surface hydrophilic, and adhesion of an offset ink to a film is inferior, presumably because molecular cleavage of the polyolefin resin occurs owing to corona discharge and low-molecular weight oxides are formed.
SUMMARY OF THE INVENTION
In a first aspect of the present invention, there is provided a thermoplastic resin film having a surface subjected to a flame treatment at an energy of 8,000 to 200,000 joule/m
2
, which is provided thereon with a coated layer comprising at least one surfactant selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants and amphoteric surfactants.
In a second aspect of the present invention, there is provided a thermoplastic resin film having a surface subjected to a flame treatment at an energy of 8,000 to 200,000 joule/m
2
which is provided thereon with a coated layer comprising a water-soluble quaternary ammonium salt copolymer (I) containing a structural unit (a) represented by the following formula (1):
wherein A represents —O— or —NH—, R
1
represents a hydrogen atom or a methyl group, R
2
represents a C
2-4
alkylene group or —CH
2
—CH(OH)—CH
2
—, R
3
, R
4
, R
5
and R
6
are the same or different and each independently represents a C
1-3
alkyl group, R
7
represents a C
1-10
alkyl group or a C
7-10
aralkyl group, n stands for an integer of 1 to 3, and X represents a chlorine, bromine or iodine atom; a structural unit (b) represented by the following formula (2):
wherein R
8
represents a hydrogen atom or a methyl group, R
9
represents a C
1-22
alkyl group, C
7-22
aralkyl group or C
5-22
cycloalkyl group; and a structural unit (c) derived from a monomer copolymerizable with the components (a) and (b), the copolymerization weight ratio of said components (a), (b) and (C) falling within a range of 30 to 70:30 to 70:0 to 40.
In a third aspect of the present invention, there is provided a thermoplastic resin film which is further provided thereon with a coated layer further comprising, based on 100 parts by weight of the water-soluble quaternary ammonium salt copolymer (I), 10 to 600 parts by weight of a polyethyleneimine polymer (II) selected from the group consisting of polyethyleneimine, poly(ethyleneimine-urea), polyaminepolyamide-polyethyleneimine adduct and alkylated (preferably, C
1-8
alkyl groups) polyethyleneimine, 5 to 500 parts by weight of a polyaminepolyamide-epichlorohydrin adduct (III), and 5 to 200 parts by weight of an alkali metal salt or alkaline earth metal salt (IV).
In a fourth aspect of the present invention, there is provided a thermoplastic resin film having a surface subjected to a flame treatment at an energy of 8,000 to 200,000 joule/m
2
which is provided thereon with a coated layer comprising a betaine type amphoteric copolymer (V) containing a structural unit (d) represented by the following formula (3):
wherein A represents —O— or —NH—, B represents a C
2-6
alkylene group, R
10
represents a hydrogen atom or a methyl group, R
11
and R
12
each represents a C
1-4
alkyl group, X represents a chlorine, bromine or iodine atom, and M represents an alkali metal ion (particularly, sodium, potassium or lithium); a structural unit (4) represented by the following formula (e):
wherein R
13
represents a hydrogen atom or a methyl group, R
14
represents a C
1-22
alkyl group, C
7-22
aralkyl group or C
5-22
cycloalkyl group; a structural unit (5) represented by the following formula (f):
and a structural unit (g) derived from a monomer copolymerizable with the component (d), (e) and (f), the copolymerizable weight ratio of said components (d), (e), (f) and (g) falling within a range of 25 to 45:30 to 70:0 to 25:0 to 25.
In a fifth aspect of the present invention, there is provided a thermoplastic resin film which is further provided thereon with a coated layer further comprising, based on 100 parts by weight of the betaine type amphoteric copolymer (V) copolymer (I), 10 to 600 parts by weight of a polyethyleneimine polymer (II) selected from the group consisting of polyethyleneimine, poly(ethyleneimine-urea), polyaminepolyamide-polyethyleneimine adduct and alkylated (preferably, C
1-8
alkyl groups) polyethyleneimine, 5 to 500 parts by weight of a polyaminepolyamide-epichlorohydrin adduct (III), and 5 to 200 parts by weight of an alkali metal salt or alkaline earth metal salt (IV).
According to the flame treatment, the adhesion of the surfactant to the film can be improved, and in addition, the coated surfactant layer makes it possible to improve the paper feed and discharge and also the transfer of the offset printing ink and ink adhesion even under high temperature and high humidity conditions in the summertime.
As described above, the synthetic paper according to the present invention permits excellent paper feed and discharge and also the transfer of the offset printing ink and ink adhesion under the high humidity conditions in the summertime so that broad demand in the practical use can be satisfied.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The thermoplastic resin film of the present invention having excellent printability comprises a base layer comprised of a thermoplastic resin film, particularly a thermoplastic resin film layer having a surface of polyolefin synthetic paper subjected to flame treatment; and a coated layer formed by applying thereto at least one coating agent comprising a surfactant selected from anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants, followed by drying.
Thermoplastic Resin Film Layer
Non-limiting examples of the thermoplastic resin film as a base layer usable in the present invention include films of thermoplastic resins such as polyolefins, e.g., polypropylene, polyethylene, and propylene-ethylene copolymer, polyethylene terephthalate, polybutylene terephthalate, polystyrene and nylon-6; and films each having
Asami Koichi
Kitamura Kazuhisa
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Oji-Yuka Synthetic Paper Co., Ltd.
Resan Stevan A.
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