KR20200069844A - Film and tile comprising the same - Google Patents

Abstract

The present invention relates to a film and a tile comprising the same. The present invention, specifically, relates to a film with minimal dimensional change under heating conditions, including a styrene-butadiene copolymer and mineral oil, and a tile having excellent dimensional stability, reduced gap opening, reduced curling, and improved eco-friendliness, including the same.

Description

Film and tile comprising the same

The present invention relates to a film and a tile comprising the same, a film having a minimal dimensional change under heating conditions, including a styrene-butadiene copolymer and a mineral oil, and excellent dimensional stability, including the same, opening, curling, and eco-friendly It's about improved tiles.

The commonly used tiles are gravure printing or transfer printing on a white sheet to prepare a printing layer, and then protect the printing layer with a transparent layer to express the appearance and base layer under the printing layer for product structural stability And it was prepared by sequentially stacking the balance layer.

At this time, a polyvinyl chloride (Poly Vinyl Chloride) resin is used as the transparent layer. In the conventional tile, a transparent film containing a large amount of a plasticizer is applied for flexibility and moldability.

For example, in Korean Patent Publication No. 10-2007-0032460, 100 parts by weight of vinyl chloride resin having a polymerization degree of 1,000 to 1,300 on the top of the printed layer, 35 parts by weight of dioctylphthalate, 3 parts by weight of barium-zinc compound, 3 parts by weight of epoxy resin Disclosed is a floor tile in which a transparent film including parts is laminated.

However, the conventional transparent film has a glass transition temperature of about 15-20°C, which is lower than the heating condition (15-45°C), so the dimensions change in the heating condition, and accordingly, the tile applied the transparent film as a transparent layer There was a problem that the dimensional stability was lowered, and the gaps were opened and curling occurred.

In addition, the conventional transparent film as described above contains a large amount of phthalate-based plasticizers, which are widely known as endocrine disruptors, so-called environmental hormones, and when the transparent film is applied to tiles, the plasticizer elutes and adversely affects human safety. There was.

Therefore, there is an urgent need to develop a transparent film with minimal dimensional change under heating conditions and a tile having improved dimensional stability, including improved clearance, curling, and eco-friendliness.

10-2007-0032460 A (2007.03.22)

The present invention has been devised to solve the above problems, and aims to provide a film having minimal dimensional change under heating conditions and excellent dimensional stability including the same, and improved clearance, curling, and eco-friendliness. do.

In order to achieve the above object, the present invention provides a film comprising a styrene-butadiene copolymer and a mineral oil, and having a rate of change in the dimensional dimension in the longitudinal direction after heating at 80 (±2)° C. for 6 hours is 0.25% or less. .

In addition, the present invention is a tile comprising a balance layer, a base layer, a printing layer and a transparent layer from bottom to top, the transparent layer comprising the styrene-butadiene copolymer and mineral oil, but at 80 (±2)° C. for 6 hours It provides a tile that is a film having a dimensional change rate in the longitudinal direction after heating for 0.25% or less.

The film of the present invention includes a styrene-butadiene copolymer and mineral oil to minimize dimensional change under heating conditions, and the tile comprising the same has excellent dimensional stability, improved clearance, curling, and eco-friendliness.

1 is a cross-sectional view schematically showing an embodiment of a tile of the present invention.

Hereinafter will be described in detail with the accompanying drawings of the present invention.

The present invention relates to a film comprising a styrene-butadiene copolymer and mineral oil, wherein the rate of dimensional change in the longitudinal direction after heating at 80 (±2)° C. for 6 hours is 0.25% or less.

The styrene-butadiene copolymer may be polymerized using a styrene-based monomer and a butadiene-based monomer.

Optionally, the styrene-butadiene copolymer may be polymerized by further using a comonomer other than a styrene-based monomer and a butadiene-based monomer.

Examples of the styrene-based monomers are styrene, α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, and 2-ethyl- It may be one or more selected from the group consisting of 4-benzyl styrene and 4-(phenylbutyl) styrene. In a specific example, the styrene-based monomer may be styrene.

The butadiene-based monomer may be at least one selected from the group consisting of butadiene, isoprene and 2,3-dimethyl-1,3-butadiene. In a specific example, the butadiene-based monomer may be butadiene.

The other comonomer may be, for example, one or more selected from the group consisting of ethylene, propylene, vinyl chloride, vinyl fluoride, polyvinyl alcohol or vinyl acetate.

In the styrene-butadiene copolymer, the bonding form of the styrene-based monomer and the butadiene-based monomer is not particularly limited, and the bonding form may be, for example, one or more selected from the group consisting of linear, branched and radial forms. have.

In the styrene-butadiene copolymer, the copolymerization form may be, for example, one or more selected from the group consisting of alternating, random, and block.

The styrene-butadiene copolymer may be, for example, a block copolymer of styrene and butadiene having viscoelasticity suitable for calendering.

As a specific example, the styrene-butadiene copolymer may be a di (di) or tri (tri) block copolymer of a hard block (A) composed of a styrene-based monomer and a soft block (B) composed of a butadiene-based monomer. In the case of a tri-block copolymer, for example, it may be A-B-A or B-A-B structure.

In another specific example, the styrene-butadiene copolymer is a di(di) or tree of a hard block (A) composed of a styrene monomer and a soft block (B') composed of a random copolymer of a styrene monomer and a butadiene monomer. (tri) block copolymer. In the case of a tri-block copolymer, for example, it may have an A-B'-A or B'-A-B' structure.

When the styrene-butadiene copolymer is a block copolymer, the glass transition temperature (Tg) of the hard block (A) may be 80 to 120°C or 90 to 110°C, and the glass transition of the soft block (B, B') The temperature may be -40 to 0°C or -30 to -10°C. The glass transition temperature may be measured using a differential scanning calorimetry (DSC) Ta instrument Q10.

Accordingly, the styrene-butadiene block copolymer has a glass transition temperature at low temperature, and thus includes a soft block having elastic properties and a hard block having hard properties at high temperature, so the styrene-butadiene copolymer The film comprising can be flexible and minimize dimensional changes under heating conditions.

The styrene-butadiene copolymer may include 50-90% by weight or 60-80% by weight of styrene and 10-50% by weight or 20-40% by weight of butadiene. When the styrene content in the styrene-butadiene copolymer is less than the above range, compatibility with a highly polar resin such as PVC resin may be deteriorated and dimensional stability may be deteriorated. Can be.

Further, optionally, when the styrene-butadiene copolymer is further polymerized using another comonomer, the other comonomer content may be included in an amount of 10% by weight or less, 5% by weight or less, or 1% by weight or less.

The styrene-butadiene copolymer can be a melt volume rate of 3-20cm ³ / 10min or 5-15cm ³ / 10min. The melt volume rate may be measured by ISO 1133 (200 ℃, 5kg). When the melt volume rate of the styrene-butadiene copolymer is outside the above range, workability may be deteriorated.

The styrene-butadiene copolymer may have a hardness of 25-75, 30-70 or 40-60. The hardness may be Shore D measured by ISO 868. When the hardness of the styrene-butadiene copolymer is less than the above range, the surface properties of the film may be deteriorated, and if it is more than the above range, the film may become hard and break.

The styrene-butadiene copolymer may have a flexural strength of 1-40 MPa, 3-35 MPa, or 10-30 MPa. The flexural strength may be measured by ISO 178 (23°C). When the flexural strength of the styrene-butadiene copolymer is less than the above range, the dimensional stability of the film may be deteriorated, and if it is more than the above range, winding of the film may be difficult as the flexibility of the film decreases.

The styrene-butadiene copolymer has a weight average molecular weight of 50,000 - may be 200,000g / mol or 70,000-130,000g / mol. When the weight-average molecular weight of the styrene-butadiene copolymer is less than the above range, moldability may deteriorate, and if it is more than the above range, processability and lightness may deteriorate. Here, the weight average molecular weight means the average molecular weight obtained by averaging the molecular weights of the component molecular species of the polymer compound having a molecular weight distribution by weight fraction. The weight average molecular weight may be measured by gel permeation chromatography (GPC).

The styrene-butadiene copolymer may have a light transmittance at 550 nm of 75% or more, 80% or more, or 90% or more. The light transmittance may be measured according to ASTM D1003. The upper limit of the light transmittance is not particularly limited, but may be 100% or less, for example. The styrene-butadiene copolymer has a light transmittance in the above range, so that the film containing it can realize excellent transparency.

The styrene-butadiene copolymer may have a haze of 7% or less, 5% or less, or 2% or less. The haze may be measured according to ASTM D1003. The lower limit of the haze is not particularly limited, but may be, for example, 0% or more or 0.5% or more. The styrene-butadiene copolymer has a haze in the above range, so that the film containing it can realize excellent transparency.

The styrene-butadiene copolymers may be used alone or in combination of two or more different styrene-butadiene copolymers.

The styrene-butadiene copolymer is 70-90% by weight or 75-88% by weight in the film It may be included. The styrene-butadiene copolymer is included in the above range to implement excellent dimensional stability.

The mineral oil serves as a softening agent, and may be for controlling moldability and Young's modulus and realizing excellent workability.

The mineral oil may be, for example, one or more selected from the group consisting of paraffin-based, naphthenic-based, and aromatic oils. As a specific example, the mineral oil may be a paraffin-based oil having excellent weather resistance and light resistance.

The mineral oil may have a kinematic viscosity at 40°C of 50-150 mm ² /s or 70-130 mm ² /s. The kinematic viscosity may be measured by ASTM D 445. If the kinematic viscosity of the mineral oil is less than the above range, mechanical properties may deteriorate, and if it exceeds the above range, flowability may deteriorate.

The mineral oil may be contained in the film 3-25% by weight or 5-20% by weight. When the mineral oil is included below the above range, the film may be hardened and the workability may be deteriorated as the Young's modulus is too high, and when it is included above the above range, the mineral oil may be bleeded onto the film surface. Workability may deteriorate.

The film may optionally further include one or more selected from the group consisting of antioxidants, lubricants, processing aids, stabilizers and flame retardants, the content is not particularly limited.

The antioxidant may be, for example, one or more selected from the group consisting of phenol-based, sulfur-based, and phosphorus-based antioxidants.

The lubricant may be used alone or in combination with stearic acid or higher fatty acids, which are saturated higher fatty acids having 18 carbon atoms, corresponding to eco-friendly lubricants.

The processing aid may be, for example, an acrylic copolymer.

The stabilizer may be, for example, at least one selected from the group consisting of barium-zinc-based or calcium zinc-based thermal stabilizers.

For example, the flame retardant may be at least one selected from the group consisting of a metal hydroxide including aluminum hydroxide and magnesium hydroxide, a phosphorus-based flame retardant, and ammonium pyrophosphate.

The film may have a thickness of 0.01-2.0mm or 0.1-1.0mm. When the film has a thickness less than the above range, it may be easily worn and the appearance may be damaged. If the film has a thickness outside the above range, manufacturing cost may increase and curling may occur.

The film may have a dimensional change rate in the longitudinal direction of 0.25% or less, 0.20% or less, or 0.10% or less after standing at 80 (±2)° C. for 6 hours, and a dimensional change rate in the width direction of 0.09% or less, 0.05% or less, or 0.03% or less. The film may have excellent dimensional stability by having a rate of dimensional change in the above range. Accordingly, the tile of the present invention to which the film is applied can minimize dimensional changes under heating conditions and improve gap opening and curling.

The film may have a Young's modulus of 15-25 MPa or 17-23 MPa in the longitudinal direction and 14-22 MPa or 16-20 MPa in the width direction. The Young's modulus may be a ratio of force to deformation in the length/width direction when the tensile test is performed at room temperature using a Universal Testing Machine (UTM). When the Young's modulus of the film is less than the above range, mechanical properties may be deteriorated, and if it is more than the above range, the film may be too hard.

The film may have a haze of 5% or less or 4% or less. The haze may be measured according to ASTM D1003. The lower limit of the haze is not particularly limited, but may be, for example, 0% or more. The film of the present invention can realize excellent transparency by having a haze in the above range.

The film may include a portion where the glass transition temperature is measured at 80 to 120°C or 90 to 110°C and a portion measured at -40 to 0°C or -30 to -10°C. The glass transition temperature may be measured using a differential scanning calorimetry (DSC) Ta instrument Q10. The film may be flexible, including two parts having a glass transition temperature in the above range, but may have excellent dimensional stability under heating conditions.

The invention also provides a tile comprising a film according to the foregoing.

Referring to FIG. 1, the tile 1 of the present invention includes a balance layer 10, a base layer 30, a printing layer 50, and a transparent layer 70 from bottom to top, wherein the transparent layer 70 is It may be the above-described film.

The balance layer 10 may be positioned at the bottom to serve to impart a warpage balance to the tile 1.

The balance layer 10 is produced by molding the composition for the balance layer 10, for example, 30-50% by weight or 35-45% by weight of PVC resin, 30-50% by weight or 35-45% by weight of filler, and Plasticizer 1-15% by weight or 5-10% by weight.

The balance layer 10 may have a thickness of 0.1-2.0mm or 0.4-1.6mm. The balance layer 10 may have an excellent effect of imparting a warpage balance to the tile 1 by having a thickness in the above range.

The base layer 30 may be positioned above the balance layer 10 to serve to give volume and strength to the tile 1.

The base layer 30 is produced by molding the composition for the base layer 30, for example, 5-20% by weight or 10-15% by weight of PVC resin, 65-85% by weight or 70-80% by weight of filler, and It may be a plasticizer containing 1-15% by weight or 3-10% by weight.

The base layer 30 may have a thickness of 0.5-5.0mm or 1.0-4.0mm. The base layer 30 may have an effect of giving volume and strength to the tile 1 by having a thickness in the above range.

The printing layer 50 may be located on the base layer 30 and may serve to give various effects to the tile 1 in terms of appearance and design.

The printing layer 50 may be manufactured by printing on one surface of a monochromatic film through one or more printing methods selected from the group consisting of transfer printing, gravure printing, and screen printing.

The monochromatic film is a layer having a white or other color, and is prepared by molding the composition for the monochromatic film, for example, 60-80% by weight or 65-75% by weight of PVC resin, 5-20% by weight of filler, or 10 -15% by weight, 1-20% by weight or 5-15% by weight of the plasticizer and 0.001-5% by weight or 0.01-3% by weight of the pigment.

The printing layer 50 may have a thickness of 0.01-2.0mm or 0.05-1.0mm. The printing layer 50 may have various appearances and design effects to the tile 1 by having a thickness in the above range.

The transparent layer 70 may be positioned above the printing layer 50 to protect the printing layer 50.

The transparent layer 70 is a film containing a styrene-butadiene copolymer and a mineral oil, which is the same as the film described above, and repeated substrates are omitted.

The transparent layer 70 may have a thickness of 0.01-2.0mm or 0.1-1.0mm. The transparent layer 70 may have an excellent effect of protecting the printed layer 50 under the tile 1 by having a thickness in the above range.

The tile 1 may further include a surface treatment layer (not shown) on the transparent layer 70 to selectively improve physical properties such as stain resistance, scratch resistance, and abrasion resistance.

The surface treatment layer is prepared by applying a composition for the surface treatment layer and then curing, for example, 45-85% by weight or 50-80% by weight of ultraviolet curing urethane acrylate and 0.1-15% by weight or 0.1-10% by weight of the photoinitiator It may be to include.

The surface treatment layer may have a thickness of 0.001-0.5mm or 0.01-0.1mm. The surface treatment layer may have excellent thickness resistance, scratch resistance, and abrasion resistance by having a thickness in the above range.

Tile 1 of the present invention may have a connection structure by a T&G (Tongue & Groove), a Click system, or a connector, which is composed of grooves and protrusions to be mutually coupled, for example. As a specific example, the tile 1 of the present invention may have a click system that does not require an adhesive during construction.

The tile 1 of the present invention may have a thickness of 2.0-6.0mm or 3.0-5.0mm. When the thickness of the tile 1 is less than the above range, the strength is lowered and may be worn out for a long period of use, and if it is more than the above range, manufacturing cost may increase.

The tile 1 of the present invention may have a dimensional change rate in the longitudinal direction of 0.09% or less or 0.07% or less, and a dimensional change rate in the width direction of 0.06% or less or 0.05% or less. The dimensional change rate may be measured after heating the tile 1 at 80 (±2)° C. for 6 hours. The lower limit of the dimensional change rate in the length direction and the width direction is not particularly limited, but may be, for example, 0% or more. The tile 1 of the present invention can achieve excellent dimensional stability by having a dimensional change rate in the above range.

Further, the tile 1 of the present invention may have a gap opening degree of 0.08 mm or less or 0.06 mm or less. The degree of gap opening may be measured by using a loupe to measure the degree of gap opening between the tiles 1 after heating the floor at 80° C. for 6 hours. The lower limit of the gap opening degree is not particularly limited, but may be, for example, 0 mm or more. The tile 1 has an effect of minimizing the gap opening by having a gap opening degree in the above range.

In addition, the tile 1 of the present invention may have a curling degree of 0.40 mm or less or 0.35 mm or less. The degree of curling may be measured by using a thickness gauge to measure the height of curling occurring at the edge of the tile 1 from the floor after heating the floor at 80°C for 6 hours. The lower limit of the degree of curling is not particularly limited, but may be, for example, 0 mm or more. The tile 1 has an effect of minimizing curling by having a degree of curling in the above range.

In addition, the tile 1 of the present invention may have a total volatile organic compound emission (Total Volatile Organic Compounds, TVOC) of 0.1 mg/m ² h or less or 0.05 mg/m ² h or less. The TVOC may be measured by the Small Chamber method using a total volatile organic compounds (TVOC) meter. The lower limit of the TVOC is not particularly limited, but may be, for example, 0 mg/m ² h or more. The tile 1 of the present invention can realize excellent eco-friendliness by having TVOC in the above range.

In the following, preferred embodiments are provided to help the understanding of the present invention, but the following examples are merely illustrative of the present invention, and it is apparent to those skilled in the art that various changes and modifications are possible within the scope and technical scope of the present invention. It is natural that such changes and modifications fall within the scope of the appended claims.

[Example]

1. Preparation of film

<Example 1>

A composition comprising 10 parts by weight of mineral oil, 1 part by weight of an antioxidant, 0.5 part by weight of a lubricant, 2 parts by weight of a processing aid, and 2 parts by weight of a stabilizer, based on 100 parts by weight of a styrene-butadiene copolymer, is kneaded at 160° C. and then 160-170 The film of Example 1 having a thickness of 0.5 mm was prepared by calendering molding at ℃.

<Example 2>

A composition comprising 20 parts by weight of mineral oil, 1 part by weight of an antioxidant, 0.5 part by weight of a lubricant, 2 parts by weight of a processing aid, and 2 parts by weight of a stabilizer with respect to 100 parts by weight of a styrene-butadiene copolymer is kneaded at 160°C and then 160-170 The film of Example 2 having a thickness of 0.5 mm was prepared by calendering molding at ℃.

[Comparative example]

<Comparative Example 1>

A composition comprising 34 parts by weight of a plasticizer and 5 parts by weight of a heat stabilizer with respect to 100 parts by weight of a PVC resin was kneaded at 160°C, and then calendered at 160-170°C to prepare a film of Comparative Example 1 having a thickness of 0.5 mm.

[Reference example]

<Reference Example 1>

A composition comprising 3 parts by weight of mineral oil, 1 part by weight of an antioxidant, 0.5 part by weight of a lubricant, 2 parts by weight of a processing aid, and 2 parts by weight of a stabilizer with respect to 100 parts by weight of a styrene-butadiene copolymer is kneaded at 160° C. and then 160-170 The film of Reference Example 1 having a thickness of 0.5 mm was prepared by calendering molding at ℃.

<Reference Example 2>

A composition comprising 40 parts by weight of mineral oil, 1 part by weight of an antioxidant, 0.5 part by weight of a lubricant, 2 parts by weight of a processing aid, and 2 parts by weight of a stabilizer, based on 100 parts by weight of a styrene-butadiene copolymer, is kneaded at 160°C and then 160-170 The film of Reference Example 2 having a thickness of 0.5 mm was prepared by calendering molding at ℃.

The compositions of the films of Examples 1-2, Comparative Examples 1 and Reference Examples 1-2 are summarized in Table 1 below.

( weight% ) Example One Example 2 Comparative example One Reference example One Reference example 2 SBC 86.58 79.68 - 92.17 68.73 PVC - - 71.94 - - Mineral oil 8.66 15.94 - 2.76 27.49 Plasticizer - - 24.46 - - Antioxidant 0.87 0.80 - 0.92 0.69 Glide 0.43 0.40 - 0.47 0.35 Processing aid 1.73 1.59 - 1.84 1.37 stabilizator 1.73 1.59 3.60 1.84 1.37

-Styrene-butadiene copolymer (SBC): block copolymer of styrene and butadiene containing 60-80 wt% styrene and 20-40 wt% butadiene, melt volume rate (ISO 1133 (200°C, 5 kg)) 5-15 cm ³ /10min, hardness (Shore D (ISO 868)) 40-60, flexural strength (ISO 178 (23°C)) 10-30 MPa, weight average molecular weight 70,000-130,000 g/mol, light transmittance at 550 nm (ASTM D1003) 90% or more, haze (ASTM D1003) 2% or less

-Mineral oil: paraffin oil, dynamic viscosity (ASTM D445) 70-130mm ² / s

-Antioxidant: Octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate

-Lubricant: stearic acid

-Processing aid: methacrylate butadiene styrene

-Stabilizer: Barium-zinc-based thermal stabilizer

-Plasticizer: Dioctyl terephthalate

2. Manufacturing of tiles

(Balance layer)

For balance layer comprising 100 parts by weight of PVC resin (LG Chemical, LS080), 100 parts by weight of calcium carbonate (Lexem, S1000), 20 parts by weight of plasticizer (LG Chemical, DOTP) and 3 parts by weight of thermal stabilizer (CNA, BZ-011) The composition was kneaded at 160°C, followed by calendering at 160-170°C to prepare a balance layer having a thickness of 0.8mm.

(Base layer)

550 parts by weight of calcium carbonate (Lexem, S1000), 32 parts by weight of plasticizer (LG Chemical, DOTP), 9 parts by weight of processing aid (LG Chemical, PA828) and thermal stabilizer ( CNA, BZ-011) The base layer composition comprising 3 parts by weight was kneaded at 160°C, and then calendered at 160-170°C to prepare a base layer having a thickness of 3.1 mm.

(Print layer)

With respect to 100 parts by weight of PVC resin (LG Chemical, LS080), 20 parts by weight of calcium carbonate (Lexem, S1000), 15 parts by weight of plasticizer (LG Chemical, DOTP), 2 parts by weight of heat stabilizer (CNA, BZ-011) and pigment ( TiO2) The composition for a monochromatic film containing 3 parts by weight was kneaded at 160°C, and then calendered at 160-170°C to transfer the printing on the surface of a white monochromatic film prepared to prepare a printing layer having a thickness of 0.10 mm.

(Transparent layer)

The transparent films of Example 1-2, Comparative Example 1 and Reference Example 1-2 described above were prepared as transparent layers.

(tile)

After stacking the balance layer, the base layer, the printing layer, and the transparent layer from the bottom to the top, heat-plying at 150°C was performed to prepare tiles of Example 1-2, Comparative Example 1 and Reference Example 1-2 having a thickness of 4.5 mm. .

[Test Example]

1-1. Film properties

<Dimension change rate>

After cutting each film to a size of 200 mm ⅹ 450 mm (length ⅹ width), the initial dimensions of the length and width directions of each cut film were measured at room temperature of about 25°C. Subsequently, in order to confirm long-term dimensional stability of the film under heating conditions (15-45° C.), each of the cut films was heated at 80 (±2)° C. for 6 hours, and then the longitudinal direction and width of each cut film. The dimension of the direction was measured. Subsequently, the dimensional change rate (%) was derived by the following <Equation 1> and shown in Table 2.

<Equation 1>

Dimensional change rate (%) = [(Late dimension-Initial dimension)/Initial dimension]ⅹ100

<Young's modulus>

When tensile specimens with a doggy bone type of 60 mm in length and 10 mm in width were subjected to a tensile test under the condition of an elongation rate of 50 mm/min using a Universal Testing Machine (UTM) at room temperature, the ratio of force to deformation in the longitudinal direction and the width direction was determined. It was measured and shown in Table 2.

<Haze>

The haze of each film was measured using Haze Meter HM-150 according to ASTM D1003 and is shown in Table 2.

<glass transition temperature>

Table 2 shows the glass transition temperature of each film using a Ta scanning Q10 (Differential Scanning Calorimetry, DSC).

2-1. Tile properties

<Dimension change rate>

After cutting each tile to a size of 150 mm ⅹ 1220 mm (length ⅹ width), the initial dimensions of the length direction and width direction of each of the cut tiles were measured at room temperature of about 25°C. Subsequently, each tile was cut at 80 (±2)° C. for 6 hours to confirm long-term dimensional stability of the tile under heating conditions (15-45° C.). After heating, the dimensions of the lengthwise and widthwise directions of each cut tile were measured. Subsequently, the dimensional change rate (%) was derived by the following <Equation 2> and shown in Table 2.

<Equation 2>

Dimensional change rate (%) = [(Late dimension-Initial dimension)/Initial dimension]ⅹ100

<Gap apart>

Each tile was cut to a size of 50 mm x 200 mm (length ⅹ width), and then, after heating the floor at 80° C. for 6 hours, the degree of gap between each tile was measured using a tape measure and shown in Table 2.

<curling>

Each tile After cutting to a size of 150 mm ⅹ 1220 mm (length ⅹ width), after heating the floor at 80° C. for 6 hours, the height at which the edges of each of the cut tiles curled from the floor were measured with a thickness gauge and are shown in Table 2.

<TVOC emissions>

After each tile was cut to a size of 16.5 mm ⅹ 16.5 mm (length ⅹ width), TVOC was measured by the Small Chamber method using a total volatile organic compounds (TVOC) meter.

It was confirmed that the film of Example 1-2 had a low dimensional change rate under heating conditions, and thus excellent dimensional stability and excellent transparency. In addition, it was confirmed that the tiles of Examples 1-2 had a low dimensional change rate and thus excellent dimensional stability, and improved clearance, curling, and eco-friendliness.

Meanwhile, it was confirmed that the film of Comparative Example 1 contained PVC and a plasticizer, and the dimensional stability was deteriorated due to a high dimensional change rate under heating conditions. In addition, the film of Comparative Example 1 had a small Young's modulus and mechanical properties were deteriorated. In addition, the tile of Comparative Example 1 was applied to the film of Comparative Example 1 as a transparent layer, it was confirmed that dimensional stability and eco-friendliness were deteriorated, and gaps and curling occurred.

On the other hand, the film of Reference Example 1 contains mineral oil in a content range below, and the Young's modulus is higher than that of the Example, thereby deteriorating flexibility of the film. In addition, in the tile of Reference Example 1, the film of Reference Example 1 was applied as a transparent layer to generate curling, and the workability was deteriorated.

On the other hand, the film of Reference Example 2 contains a mineral oil exceeding the content range, the Young's modulus is low, the dimensional stability is slightly lower than in Examples 1 and 2, and the mineral oil is bleeding over the film surface. In addition, in the tile of Reference Example 2, the film of Reference Example 2 was applied as a transparent layer to cause gaps and curling, and the workability was deteriorated.

1: Tile 10: Balance layer
30: base layer 50: printed layer
70: transparent layer

Claims (13)

A film comprising a styrene-butadiene copolymer and mineral oil, wherein the rate of change in the longitudinal dimension after heating at 80 (±2)° C. for 6 hours is 0.25% or less. According to claim 1,
The film has a Young's modulus (Universal Testing Machine, UTM) of 15-25MPa in the longitudinal direction and 14-22MPa in the width direction. According to claim 1,
The film has a haze (ASTM D1003) of 5% or less. According to claim 1,
The film is a film that includes a portion measured by glass transition temperature of 80 to 120 ℃ and a portion measured by -40 to 0 ℃. According to claim 1,
The styrene-butadiene copolymer film is a block copolymer of styrene and butadiene. The method of claim 5,
The styrene-butadiene copolymer film is a block copolymer comprising 50-90% by weight of styrene and 10-50% by weight of butadiene. According to claim 1,
The mineral oil film is a paraffin-based oil. According to claim 1,
The film is a film comprising 70-90% by weight of styrene-butadiene copolymer and 3-25% by weight of mineral oil. A tile comprising a balance layer, a base layer, a printing layer and a transparent layer from bottom to top, wherein the transparent layer is a film of any one of claims 1 to 8. The method of claim 9,
The tile is a tile having a rate of dimensional change in the longitudinal direction of 0.09% or less after heating at 80 (±2)° C. for 6 hours. The method of claim 9,
The tile is a tile having a degree of gap opening after heating the floor at 80° C. for 6 hours or less. The method of claim 9,
The tile is a tile having a curling degree of 0.40 mm or less after heating the floor at 80° C. for 6 hours. The method of claim 9,
The tile has a total volatile organic compound emission (Total Volatile Organic Compounds, TVOC) of 0.1mg / m ² h or less.

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