JPS61144786A - Slip sheet for cassette tape - Google Patents

Abstract

PURPOSE:To realize a sheet excellent in transparency, anti-static property and slip characteristic by constituting a slip layer of a vinyl group polymer in which organopolysiloxane units are combined in blocklike and graftlike forms and it derivative. CONSTITUTION:The slip sheet for a cassette tape consists of a base material sheet made of transparent plastic sheet and a slip layer. The slip layer is constituted of vinyl group polymer A in which organopolysiloxane units are combined in blocklike form or graftlike form or a derivative B made by deforming the polymer A or mixture of the two. By constituting the slip layer of specific polymers, a slip sheet excellent in transparency, anti-static property and slip characteristic can be realized.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention aims to prevent the tape and reel of a cassette tape from becoming static-charged.

This relates to a slip sheet for casseno toteso that is loaded into the magazine of casseno toteso for the purpose of achieving smooth rotation, and provides a transparent sheet that exhibits a permanent antistatic function for tapes and reels. It is.

[Conventional technology]

Conventionally, in order to prevent static electricity on the tape and reel of cassette tape, and to achieve the effect of smoothly rotating the tape and reel, the slip sheet for cassette tape loaded into the magazine of cassette tape has [1] A plastic sheet made by mixing a conductive substance such as carbon black or graphite with tetrafluoroethylene or ultra-high molecular weight polyethylene, or a paper (conductive paper) in which the conductive substance is mixed with a lubricant such as silicone resin or fluorine resin. (ii) A sheet made of polyethylene terephthalate 7- coated with the conductive substance, etc. (ii) A surface of a transparent plastic sheet coated with a surfactant-based antistatic agent or a lubricant. 5 (iii) A synthetic resin film containing a surfactant or a lubricant is formed on the surface of a transparent plastic sheet. A sheet or the like on which a conductive metal thin film is entirely formed is used.

[Problem that the invention seeks to solve]

By the way, since the notebook described in item [1] above is opaque, the winding state of the magnetic tape cannot be seen from the outside of the cassette tape, and the sheet described in item [11] above is not electrically charged. Antistatic agents and lubricants tend to become sticky or peel off from Surinozonote, damaging the antistatic effect, and peeled antistatic agents and lubricants adhere to the tape, causing the tapes to stick together and hindering smooth tape running. Furthermore, the sheet described in section Ciii) above is
In addition to insufficient transparency, the conductive metal thin film peeled off, resulting in a decrease in antistatic properties.

In contrast, the present invention provides a novel slip sheet for cassette tapes that has excellent properties such as transparency, antistatic properties, and lubricity properties, and which maintains these properties for a long period of time. [Means for solving the problem] The slip sheet for cassette tapes of the present invention comprises a base sheet made of a transparent plastic sheet and a slip layer formed on at least one side of the base sheet. The slip layer is essentially a vinyl polymer [A] in which organopolysiloxane units are bonded in a block or graft form, or a modified derivative of the polymer [B]. ], or a mixture of both.

Since the slip sheet for cassette tapes of the present invention is characterized by the slip layer of the sheet, the structure of this slip layer will be explained below.

As described above, the slip layer of the slip sheet for cassette tapes of the present invention is made of a vinyl polymer [A] in which organopolysiloxane units are bonded in a block or graft form, or a modified polymer [A]. derivative [B
], or consisting essentially of both of these polymers [A] and [B], coating at least one side of the base sheet with a coating agent containing the vinyl polymer [A], etc. A method of forming a slip layer by drying, etc., and coating at least one side of a base sheet with a coating agent containing a composition in which the vinyl polymer [A] etc. is produced by heating, etc., and then heating. There is a method of forming a syslip layer by producing the vinyl polymer [A] and the like on a base sheet.

Vinyl polymer in which organopolysiloxane units are bonded in block or graft form [A) 1r: One method for obtaining vinyl polymer is to obtain an organopolysiloxane unit having at least one siloxane unit represented by the general formula or in the molecule. This is a method of polymerizing polysiloxane and a radically polymerizable monomer.

As mentioned above, the organopolysiloxane used in obtaining the vinyl polymer [A]e by this method is a siloxane represented by the general formula fll or general formula (2) as a siloxane unit bonded to a silicon atom. It is sufficient that it has at least one unit, and there are no particular restrictions on its molecular structure or the bonding position of the siloxane unit represented by the above general formula (1) or general formula (2). It may be either a linear structure or a two-molecular chain structure. In addition, this organopolysiloxane has a molecular chain terminal such as a triol group such as a trimethylsilyl group, a hydroxydiorganosilyl group such as a hydroxydimethylsilyl group, or a mercazotozolopyldimethyl group (2). As the organic group bonded to a silicon atom other than the siloxane unit represented by, for example, an organopolysiloxane having a methyl group, an ethyl group, a zolopyl group, a phenyl group, a trifluorozolopyl group, etc. is preferably used. Furthermore, in this organopolysiloxane, there is of course no restriction on the arrangement order of the siloxane units represented by the above general formula (1) or general formula (2) and other organosiloxane units; All units of the polysiloxane may be represented by the general formula +1) or the general formula (2).

The other component, the radically polymerizable monomer, used to obtain the vinyl polymer [A]t- in the above method is a monomer represented by the general formula, for example, methyl methacrylate, Methyl acrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate,
Butyl methacrylate, inbutyl acrylate, inbutyl methacrylate, t-butyl acrylate, t-
Butyl methacrylate, inamyl acrylate, inamyl methacrylate, cyclohexyfluacrylate,
Cyclohexyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, N-methylol acrylamide, 2-hydroxyethyl acrylate, 2-hydrochine ethyl methacrylate,
2-Hydroxyzolopyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 2-hydroquine-3-phenoquine zolobyl methacrylate, 2-hydroxy-3-phenoxyzolobyl acrylate, acrylic acid , methacrylic acid, acryloyloxyethyl monosuccinate, glycidyl methacrylate, 2-aziridinylethyl methacrylate, allyl 2-aziridinylpropionate, acrylamide, methacrylamide, diaseptone acrylamide, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-acrylamido-2-methylpropanesulfonic acid, an adduct of a diisocyanate such as an equimolar adduct of 2.4-1-ruene diiso7anate and 2-hydroxyethyl acrylate, and a radically polymerizable monomer having active hydrogen. etc., vinyl esters of fatty acids such as vinyl acetate, zorobio/vinyl acid, monomers such as styrene, α-methylstyrene/l vinyltoluev, maleic anhydride, itaconic acid, and mixtures of these monomers. etc. can be used.

Another method for obtaining a vinyl polymer [A] in which organopolysiloxane units are bonded in a block or graft form is to add the above-mentioned radically polymerizable monomer to mercazo, which is added as necessary. A whole vinyl polymer having functional groups such as hydroxyl group, carboxyl group, epoxy group, incyanate group, and amino group is produced by polymerizing in the presence of a polymerization degree regulator such as ethanol, mercaptozolopionic acid, and dodenylmercagutan. After the obtained polymer is obtained, a bonding reaction between the polymer and a reactive organopolysiloxane having a methyloquine group, a hydroxyl group, a carboxyl group, an amino group, an epoxy group, a mercapto group, etc. is performed, if necessary, with a polyvalent isoneanate compound, This method is carried out in the presence of a polyvalent epoxy compound or the like.

In addition, the vinyl polymer [which is the reaction product of the vinyl polymer having the functional group obtained by polymerizing the radically polymerizable monomer described above and the reactive organopolysiloxane]
In the case where the bonding reaction between the two is carried out by post-treatment such as heating, the formation of the slip layer composed of A] is performed by combining a vinyl polymer having a functional group and a reactive organopolysiloxane. This can also be achieved by coating at least one side of the base sheet with the coating agent contained therein, and then subjecting it to a post-treatment such as heating.

There is no particular restriction on the ratio of the above-mentioned organopolysiloxane and the above-mentioned radically polymerizable monomer in the vinyl polymer [A] constituting the slip layer in the slip sheet for cassette tape of the present invention. In a wide range of ratios of 1,000,000 to 1 part by weight of radically polymerizable monomer to 100 parts by weight of polysiloxane,
It has been confirmed that the slip layer has sufficient lubricity and antistatic properties.

In addition, each polymerization in obtaining the polymer [A]'e can be carried out using conventionally known polymerization methods, such as benzoyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide,
Solution polymerization, suspension polymerization, emulsion polymerization, bulk polymerization, etc. using a polymerization initiator such as α, α′-azodiisobutyronitrile can be used. Also, the vinyl polymer [A] can be obtained by each of the above methods. In this case, by selecting and using a monomer having a quaternary ammonium base or a tertiary amino group as a component of the radically polymerizable monomer, better sliding properties and antistatic performance can be achieved. The slip layer may have the following properties.

In addition, as a component of the radically polymerizable monomer when forming the vinyl polymer (A:l), one that completely blinds functional groups such as hydroxyl group, carboxyl group, epoxy group, aziridinyl group, isocyanate group, etc. When used, the slip layer can be thermally cured using the functional groups of the vinyl polymer [A] in the slip layer, so it has good heat resistance in addition to slipperiness and antistatic property. It is also possible to form a completely blind slip layer with excellent properties.Incidentally, the formation of a heat-cured slip layer is performed using a coating agent containing a vinyl polymer [A] having the above-mentioned heat-curable functional group. (2) A coating agent containing two or more thermosetting polymers is applied onto the substrate sheet and then heated. (3) The coating agent contains a thermosetting polymer. A crosslinking agent such as a polyisocyanate-based compound, a polyepoxy compound, a polyaziridinyl-based compound, a polyamino compound, etc. is added and cured after coating on the base sheet. (4) Various catalysts, as necessary, are added to the coating agent. For example, a method may be used in which a material containing dibutyltin laurylate, pyridine, or the like is applied onto a base sheet and then cured.

Furthermore, the derivative CB obtained by modifying the vinyl polymer (:A)' contains, for example, a hydroxyl group, a carboxyl group, The vinyl polymer [A] obtained using a monomer having a functional group selected from an epoxy group, an aziridinyl group, an incyanate group, etc. was modified by introducing a third component into the functional group. A typical example of this derivative CB) is a derivative CB) in which a radically polymerizable unsaturated group is introduced into the carboxyl group of the vinyl polymer [A] by, for example, a total addition reaction of glycidyl methacrylate. By doing so, it is possible to obtain a material with excellent heat resistance in which the slip layer is essentially composed of a polymer having a crosslinked structure introduced by irradiation with ionizing radiation.

In addition, the method of introducing a radically polymerizable unsaturated group into the polymer [A] is as follows: ([) When the functional group is a hydroxyl group, a condensation reaction is carried out with a monomer having a carboxyl group such as acrylic acid or methacrylic acid. (21 (3) When the functional group is a carboxyl group or a sulfone group, a monomer having a hydroxyl group is subjected to a condensation reaction. (3) When the functional group is an epoxy group, incyanate group, or aziridinyl group, a monomer having a hydroxyl group or a monomer having a carboxyl group is (4) When the functional group is a hydroxyl group or a carboxyl group, a monomer having an epoxy group or a monomer having an aziridinyl group, or furthermore, a diinocyanate compound and an acrylic ester monomer having a hydroxyl group. A method such as an addition reaction of an equimolar adduct with a polymer is used, but the reaction is preferably carried out in the presence of a trace amount of a polymerization inhibitor such as hydroquinone while blowing dry air.

Further, the derivative C into which the radically polymerizable unsaturated group is introduced
In the case of a slip layer according to B), ethylene glycol diacrylate, ethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate is added in the coating agent in order to improve the crosslinking density of the derivative CB) by irradiation with ionizing radiation. , hexanediol diacrylate, hexanediol dimethacrylate, l-rimethylolnoroban triacrylate, trimethylolpropane trimethacrylate, trimethylolpropane diacrylate,
Trimethylolzolopane dimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate,
Dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, ethylene glycol diglycidyl ether diacrylate, ethylene glycol diglycidyl ether dimethacrylate, polyethylene glycol diglycidyl ether diacrylate, polyethylene glycol diglycidyl ether dimethacrylate, propylene glycol diglycidyl Ether diacrylate, propylene glycol diglycidyl ether dimethacrylate, polypropylene glycol diglydyl ether diacrylate, polypropylene glycol diglydyl ether dimethacrylate, nlubitol tetraglycidyl ether tetraacrylate,
It is preferable to mix sorbitol tetraglycidyl ether tetramethacrylate or the like in an amount of about 0.1 to 100% by weight based on the derivative (B).

Methods for introducing a crosslinked structure into the derivative CB) include a method of total irradiation with ionizing radiation and a method of using radical polymerization initiator sound, but a method using ionizing radiation is preferred from the viewpoint of completing curing in a short time. As ionizing radiation, electron beams, ultraviolet rays, r-rays, etc. can be used, and electron beams, r11! In this case, it is preferably about 1 to 20 Mrad,
In the case of ultraviolet irradiation, sensitizers that generate radicals upon ultraviolet irradiation, such as benzoquinone, benzoin, be/zoin methyl ether natonopenzoin ethers, halogenated acetophenones, and biacyl, can be used. preferable. In addition, in a method using a radical polymerization initiator, a polymerization initiator such as various peroxides such as benzoyl peroxide or α, α'-azobisin butyronitrile is added at a ratio of 0.1 to the derivative (B). ~1% by weight
It is sufficient to add a certain amount and heat it above the decomposition temperature.

The slip sheet for cassette tapes of the present invention, that is, the slip layer essentially consists of the polymer [A], the derivative [B] obtained by modifying the polymer [A], or both. As described above, the slipcoat for cassette chives of the invention includes a polymer [A] or a derivative obtained by modifying the polymer [A]'r on at least one side of a base sheet made of a transparent silicone sheet. [B], or a coating agent containing both, or a post-treatment such as heating to form the polymer [A].
It can be easily obtained by coating with a coating agent containing a component that produces such as, drying, and subjecting it to post-treatments such as heating if necessary. To the coating agent for forming the slip layer, an appropriate solvent is added as necessary to adjust the coating suitability, but the reaction product solution obtained when obtaining the polymer [A] or derivative CB) may be used as is as a coating agent. Further, in order to improve storage stability, it is preferable to add a polymerization inhibitor such as hydroquinone or hydroquinone monomethyl ether to this coating agent. The coating agent is composed of the above-mentioned polymer [A], derivative [B], or polymer [A] and derivative CB). Of course, it is a homogeneous solution containing additives such as agents. However, in the slinosozoate for kasenttheso according to the present invention, since the slip layer is essentially composed of the polymer [A], the derivative [B], or both thereof, the above-mentioned coating agent contains If necessary, it may contain polymers such as cellulose resins such as ethyl cellulose and nitrocellulose, polyester resins, polyurethane resins, rosin ester resins, im-based resins such as cyclized im, chlorinated polyolefin resins, pigments, etc. Coloring agents such as dyes may also be added as appropriate.

The method of forming a slip layer on the surface of the base sheet using the coating agent is the same as the conventional coating method of general coating agents, such as roll coating method, gravure coating method, screen coating method, fountain coating method, etc. Coating on the surface of a base sheet, such as polyester film, polyzolopyrene film, cellophane, cellulose acetate film, etc., with a solid content of about 0.1 to 4 f/m2 by the coating method of
It is dried to form a slip layer as a surface layer. .

In addition, the above-mentioned polymer [A
] or derivative (B), after the solvent etc. in the coating agent layer formed on the base sheet is dried, a predetermined thermosetting treatment or ionizing radiation irradiation treatment is performed.

〔Example〕

Below are specific configurations and manufacturing examples of the slip/tape for cassette tapes of the present invention? This will be explained below, and the properties of the obtained sulinosot for caseno totes will also be explained.

Example 1 The following composition (1) was completely sealed in a reaction vessel equipped with a heating and stirring device, and the mixture was refluxed for 10 hours to carry out a polymerization reaction.

Composition (1) Methyl methacrylate 30 parts by weight Dimethylaminoethyl methacrylate 152 parts by weight Methacrylic acid 43 parts by weight Dimethylpolysiloxane (*1) 50 parts by weight Methyl ethyl ketone 1500 parts by weight α, α'-azobisin butyronitrile Itt part , 0.2 parts by weight of hydroquinone, 75 parts by weight of allyl chloride, and 1500 parts by weight of inzolovyl alcohol were added to the reaction product solution, and the mixture was reacted at 80°C for 6 hours to complete the polymerization reaction described above. The tertiary amino groups in the polymer produced were converted to quaternary ammonium groups.

Coating material [A] consisting of the reaction product solution obtained in this way
'lz, a ratio of 0.52 (solid content) 2 to 2 ('co,
A syslip layer was formed by applying the coating approximately evenly with a gravure plate and drying to obtain a slip sheet (a) for a cassette tape, which is an example of the present invention.

The surface electrical resistance of the obtained Slip-N-1 (a) for cassette cheese was 3.6×10 10 Ω, and the half-life of the charging voltage was 4 minutes 35 seconds. The coefficient of dynamic friction between the slip layers of Note t.(aJ) was 0.13, and the coefficient of dynamic friction of the slip layer against the polyester film was 0.24.

In addition, the cassette chip slot (a) is cut to a predetermined size and is interposed as a slotted sheet between the magnetic tape and the cassette case, and the slotted sheet is inserted between the magnetic tape and the cassette case.
When a durability test was conducted for 00 reciprocations, it showed excellent antistatic performance (VC), no dust was attached to the magnetic tape, and no irregular winding of the tape occurred.

Example 2 Coating material [A] 1o used in Example 1 above.

Coating material CB:l' consisting of a homogeneous mixed solution of 3 parts by weight of glycerol l-'J glycidyl ether,
The same polyester film as that used in Example 1 was coated at a ratio of o, sr (solid content)/m'', dried, and then crosslinked at 60°C for 20 hours to form a polyester film according to the present invention. Slip notebook for cassette tape as an example product (b
)k got it.

The surface electrical resistance of the obtained slip sheet for cassette tape [b, 1] was 6.2×10”Ω, and the half-life of the charging voltage was 1/5.
It was 5 seconds. Further, the coefficient of dynamic friction of the slip layer of Note [b] with respect to the polyester film was 0.22.

Furthermore, when the sheet (b) was punched into a predetermined size and simultaneously subjected to embossing at 150°C, these processes and forming were carried out extremely smoothly.

Example 3 A polymerization reaction was carried out in which the following composition +21'i was reacted for 10 hours in a reaction vessel.

Composition (2) Methyl methacrylate 300 parts by weight Dimethylaminoethyl methacrylate 314 parts by weight 2-hydroxymethacrylate 130 parts by weight Dimethyl poly/loxane (*1) 15 parts by weight α,α'-azobisisobutyronitrile 2.5 parts by weight Part toluene 1000 parts Methyl ethyl ketone 250 parts Next, 100 parts by weight of toluene, 150 parts by weight allyl chloride, and 200 parts by weight methyl alcohol were added to the reaction product solution, and reacted at 80°C for 4 hours. .

A coating material (CJe, used in Example 1) was prepared by adding 1.5 parts by weight (solid content) of tolylene diincyanate adduct [organic ino/anate compound manufactured by Nippon Polyurethane ■: Coronate L] to the reaction product solution thus obtained. It was coated onto the same polyester film using a gravure plate with a depth of 40μ at a ratio of 12 (solid content)/m', dried, rolled up, and aged indoors at 40°C for 48 hours.

By curing, the Srinozo sheet for Caseno Toteso [C)?, which is an embodiment of the present invention, is cured. : Gain.

Vol. 1) Dynamic friction coefficient of the slip layer in sorting [C] with respect to the ester film &'! , 0.12, and the charging voltage half-life was 45 seconds.

When the sheet [C] was subjected to the same durability test as the sheet [a] in Example 1, it was found to have excellent antistatic effect.

Example 4 A polymerization reaction was carried out consisting of refluxing the following composition +31'ilo hours in a reaction vessel.

Composition (3) Methyl methacrylate 200 parts by weight Dimethinogeminoethyl acrylate 910 parts by weight (2-hydroxyethyl methacrylate) 260 parts by weight Dimethylpolysiloxane (*2) 24 parts by weight α,α-azobisisobutyronitrile 5 Part by weight Ethyl acetate 4100 parts by weight Next, 1 part by weight of benzoquinone was added to the reaction product solution to stop the reaction, and then 640 parts by weight of 2-hydroquine ethyl acrylate and 2,4-toluene diisocyanate were added. The molar adduct was added, and further 50 parts by weight of dibutyltin silaurylate was added, and the mixture was reacted at 80° C. for 5 hours with dry air running at full speed. Thereafter, 1000 parts by weight of methyl ethyl ketone, 450 parts by weight of allyl chloride and 1200 parts by weight of methyl alcohol were added, and the mixture was heated at 80°C.
After reacting at C for 4 hours, the reaction product solution was cooled to room temperature, and 200 parts by weight of an ultraviolet sensitizer (Nilgacure 184, manufactured by Ciba Geigy) was added to form an ultraviolet curable coating material (D). Obtained.

The obtained coating material (D)'& 17 (solid content)/
After coating approximately evenly in the ratio of m', and drying, apply ultraviolet rays of 10 to
A slip sheet (d) t- for a cassette tape, which is an example of the present invention, was obtained by passing the slip sheet under Crn at a running speed of 10 m/min to form a slip layer.

The obtained slip sheet for cassette tape (d) had a surface electrical resistance of 8.2×10 9 Ω and a charging voltage half-life of 17 seconds. The coefficient of dynamic friction of the slip layer of sheet (d) with respect to the polyester film was 0.27.

When sheet (d) was subjected to a durability test as a slip sheet in the same manner as sheet (a) in Example 1, it showed excellent antistatic effect.

Example 5 A polymerization reaction was carried out consisting of refluxing the following composition (4) for 10 hours in a reaction vessel.

Composition (4) Stearyl acrylate 324 ftt parts Dimethylaminoethyl methacrylate 314 parts acrylic acid 72 parts by weight Dimethylpoly/loxane (ゞ3) 35 parts α,α'-azobisisobutyronitrile 2 parts by weight Toluene
1,000 parts by weight 250 parts by weight of methyl ethyl ketone Next, after adding 0.3 parts by weight of hydroquinone to the reaction product solution, 71 parts by weight of glyc7dyl methacrylate was heated at 90°C to 100° while blowing dry air. The reaction was carried out at C for 8 hours. Furthermore, 1,000 parts by weight of toluene, 150 parts by weight of allyl chloride
parts by weight and 200 parts by weight of methyl alcohol at 80°C.
By reacting for 4 hours, the coating material (E)? :Obtained.

The thus obtained coating material (E) was coated with a 50 μm thick polyester film that had been subjected to t-corona discharge treatment using a gravure plate with a plate depth of 40 μm to give a coating material of 0.39 (solid content)/
After coating approximately evenly in the ratio of -, the solvent was dried, and an electron beam accelerated to 175 KV in a nitrogen gas atmosphere was applied.
A slip layer was formed by irradiating and curing the material, thereby obtaining a sli-no-zo sheet for cassette tape [e], which is an example of the present invention.

The half-life of the charging voltage of the obtained slip sea) (e) is 7 seconds,
The coefficient of dynamic friction of the slip layer against the polyester film was 0.27.

Example 6 A coating material obtained by adding 5 parts by weight of dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku: DPHA) to 100 parts by weight of the coating material (E) in Example 5 and uniformly dissolving it. Coating material CF) f:,
Coated on polyester film using the same procedure as in Example 5 above.

After drying, a slip layer was formed by irradiating and curing with an electron beam IMrad accelerated to 175 KV in a nitrogen gas atmosphere, thereby obtaining a slip sheet for cassette totezo [f], which is an example of the present invention.

The half-life of the charged voltage of the obtained Surinozo/-to [f] is 9 seconds,
The dynamic friction coefficient of the suritsuno layer against the polyester film was 0.25.

Example 7 A polymerization reaction was carried out consisting of refluxing the following composition f5+f for 10 hours in a reaction vessel.

Composition (5) Methyl methacrylate 300 parts by weight Dimethylaminoethyl acrylate 314 parts by weight 2-hydroxyethyl methacrylate 130 parts by weight α,α'-azobisisobutyronitrile 2 parts by weight Toluene
1,000 parts by weight methyl ethyl ketone
To 100 parts by weight of the reaction product solution obtained, 250 parts by weight was prepared with a viscosity of 200 centistokes (200 centistokes) in which both ends of the molecular chain were blocked with γ-mercazotozolovir dimethylnryl groups.
A coating material containing 3.5 parts by weight of dimethylpolysiloxane (25°C) and 15 parts by weight of tolylene diisocyanate adduct [organic isocyanate compound manufactured by Nippon Polyurethane ■: Coronate L] was not subjected to corona discharge treatment. 11 on a polyester film with a thickness of 50μ
(solid content)/A approximately evenly applied, after drying, 40°
The entire slit layer was formed by leaving the sheet in an atmosphere of C for 72 hours to cure it, thereby obtaining a slig sheet (g) for a cassette totezo, which is an example of the present invention.

The half-life of the charging voltage of the obtained sheet [g] was 18 seconds, and the coefficient of dynamic friction of the slip layer against the polyester film was 0.
It was 24.

In addition, two surisono sheets (g)'t-1 and 7-t (g
) are overlapped so that the slitsuzo layers are in contact with each other, 150
When left for 1 second at 13 kg/cm2 at °C, it was confirmed that there was no phenomenon such as fusion on the overlapping surfaces, and a slip layer with excellent heat resistance was obtained.

Example 8 A polymerization reaction was carried out consisting of refluxing the following composition (6) for 10 hours in a reaction vessel.

Composition (6) Ethyl methacrylate 110 parts by weight Methacrylic acid 20 parts by weight Diethylaminoethyl methacrylate x5 parts by weight Succinic anthodoperoxide 1 part by weight Toluene
250 parts by weight methyl ethyl ketone 2
After adding 1 part by weight of hydroquinone monomethyl ether to the obtained 50 parts by weight solution, 75 parts by weight of allyl chloride and 250 parts by weight of inonorobyl alcohol were added, and the mixture was allowed to react at 80°C for 4 hours. Ta.

Epoxy-modified silicone oil (KF-100 manufactured by Nishinetsu Chemical Co., Ltd.) was added to 100 parts by weight of the obtained reaction product solution.
The coating material (H) to which all 5 parts by weight had been added was applied to the coating material CG)e in Example 7.

The product was formulated into a polyester film using the same drying and curing procedure to obtain Surisozoshi Bh) 1 for Kasent Teso, which is an example product of the present invention.

The half-life of the charging voltage of the obtained sea Bh) was 15 seconds, and the coefficient of dynamic friction of the slip layer against the polyester film was 0.2.
It was 1.

The half-life of the charging voltage for the slip sheet for cassette tape in each of the above examples was determined by fixing the sample on a rotating disk of a measuring instrument [Model Sp-428 Electrostatic Paper Analyzer manufactured by Kawaguchi Electric Works] and rotating it at 1.00 rpm. 5KV
This is the value obtained by measuring the charging voltage of the sample in an atmosphere of 25° C. and 50% RH after applying a charge to the sample for 30 seconds by corona discharge.

Moreover, the dynamic friction coefficient is a value measured according to ASTM D 1894.

[Action and effect]

The slip sheet for cassette tapes of the present invention is equipped with a slip layer essentially composed of a specific polymer, and exhibits permanent slip properties and antistatic properties, as well as excellent transparency. It is something that exhibits the same characteristics.

Claims (3)

[Claims] (1) A slip sheet for a cassette tape comprising a base sheet made of a transparent plastic sheet and a slip layer formed on at least one side of the base sheet, wherein the slip layer is made of organopolysiloxane units. A vinyl polymer [A] bonded in a block or graft form, or a modified derivative of the polymer [A] [B], or both of these polymers [A],
A slip sheet for cassette tape, characterized in that it essentially consists of [B]. (2) Vinyl polymer [A], a modified derivative of the polymer [A] [B], or both of these polymers [
The cassette tape slip according to claim 1, wherein A] and [B] are (co)polymers of one or more monomers having a quaternary ammonium base or a tertiary amino group. sheet. (3) Vinyl polymer [A], a modified derivative of the polymer [A] [B], or both of these polymers [
The slip sheet for a cassette tape according to claim 1, wherein A] and [B] are polymers having a crosslinked structure.