JPH03148527A - Electric carpet and surface material thereof - Google Patents

Abstract

PURPOSE:To increase a heat-resistant characteristic, a color dying and a stiffness by a method wherein a surface material for a electric carpet is formed by fiber composed of acrylonitrile polymer having a specified polymer and a polymerization degree of 600 to 1,500 and further having a specified elongation percentage. CONSTITUTION:Acrylonitrile copolymer composed of a polymer unit 1 expressed by a formula I and a polymer unit 2 expressed by a formula II (M denotes a cation of one equivalent of a hydrogen atom), having a polymerization unit 2 of 0.4 to 0.1 mol% in respect to a total value of the polymerization unit 1 and the polymerization unit 2 and having a polymerization degree 600 to 1,500 is wet spinned to get acrylic fiber. This acrylic fiber has a elongation percentage of 10% or less at 260 deg.C in view of a relation between a temperature measured under an increased temperature and an expansion percentage. This acrylic finer is constructed as a non-woven fabric or the like through a kneed W punch or the like so as to form a surface material for an electrical carpet.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to the use of acrylic fibers as a surface material for electric pets and electric pets using the same. More specifically, the present invention relates to the use of acrylic fibers with excellent heat-resistant color fastness as a surface material for electric pets and electric pets using the same. (Prior Art) Conventionally, acrylic fibers have been widely used for carpets, especially household carpets that are often walked on barefoot, due to their vivid color development and soft, warm composition. on the other hand,
Electric force-PET with built-in heater has become popular in recent years, but conventional acrylic fibers have insufficient heat-resistant color fastness and have high elongation at high temperatures. When used as a surface material, it has the disadvantage of discoloration or cracking, and in reality it is
Not used as a pet surface material. As is well known, acrylic fibers have excellent color development, texture, and volume. If these shortcomings can be overcome, acrylic fibers will be as good as the polyester, polyamide, wool, etc. currently used as a surface material for electric pets. It is easy to guess what will happen. However, no acrylic fiber has been developed or known that eliminates the above-mentioned drawbacks. (Problems to be Solved by the Invention) An object of the present invention is to provide acrylic fibers as a material for surface materials for electric pets. Another object of the present invention is to provide a surface material for electric pets containing acrylic fibers having excellent heat-resistant color fastness and set resistance. Still another object of the present invention is to provide an electric power pet equipped with the above-mentioned surface material of the present invention. Further objects and advantages of the present invention will become apparent from the description below. (Means and effects for solving the problems) According to the present invention, the above objects and advantages of the present invention are as follows: (A), (a) Polymerization represented by the following formula (1) % formula % unit and the following formula (2) % formula % where M is a hydrogen atom or a -equivalent cation, consisting essentially of a polymerized unit represented by (b) the above polymerized unit (1) and the polymerized unit (2) (c) consists of an acrylonitrile-based copolymer in which the polymerized unit (2) accounts for 0.4 to 1.5 mol% relative to the total of (c) the degree of polymerization is in the range of 600 to 1.500; ) In the relationship between temperature and elongation rate measured under elevated temperature, 260℃
This is achieved by an electro-pet surface material characterized in that it contains acrylic fibers, with an elongation rate of 10% or less. As mentioned above, the acrylic fiber used in the surface material of the present invention is a novel acrylic fiber characterized by the requirement (A) for specifying the polymer that forms it and the requirement CB for specifying its elongation rate at high temperatures. It is a fiber. Regarding the key point (A), the polymer has polymerized units of the above formula (1) derived from acrylonitrile and 2 to acrylamide-
It consists essentially of polymerized units of the above formula (2) derived from 2-methyl-propanesulfonic acid (hereinafter abbreviated as AMPS) or a salt thereof. The ratio of polymerized units (1) and polymerized units (2) is 0.4 to 1.5 mol% of polymerized units (2) (99.6 to 1.5 mol% of polymerized units (1)) based on the total of both polymerized units. 98.5 mol%). The polymerized unit (2) is preferably 0.6 to 2 mol% (polymerized unit (1) is 9
9.4 to 98.2 mol%). If the proportion of the polymerized unit (2) is less than 0.4 mol %, gelation tends to occur during the polymerization process, and deep color dyeing becomes difficult due to insufficient dyeing seat. Also, if it exceeds 1.5 mol%,
Heat resistance characteristics, which will be described later, deteriorate. Furthermore, regarding requirement (A), the above polymer has a degree of polymerization of 600.
~1.500. The preferred degree of polymerization is 800~
It is 1,100. If it is less than 600, the strength as a normal acrylic fiber cannot be obtained, and if it exceeds 1.500, gelation is likely to occur during the polymerization process, and in order to carry out normal wet spinning,
Viscosity is too high. As specified in requirement (A), the acrylic fiber used in the surface material of the present invention has a polymerization unit (1) and a polymerization unit (2) based on the sum of these units.
2) in a proportion of 0.4 to 1.5 mol%. According to the research of the present inventor, polymerized unit (1) and polymerized unit (
It has been found that the above objects and advantages of the present invention can be maintained even if a small amount of other polymerized unit (3) is further contained under the condition that the above ratio of 2) is maintained. That is, the acrylonitrile copolymer containing such other polymerized units (3) meets the following requirement (A) instead of requirement (A).
): (A) (a) Polymerized unit of the above formula (1), the above formula (2)
) and the polymerized unit represented by the polymerized unit (3) which is different from the polymerized unit of the above formula (2) derived from a monomer copolymerizable with acrylonitrile, (b1) the above polymerized unit The polymerized unit (2) accounts for 0.4 to 1.5 mol% of the total of (1) and the polymerized unit (2), and the polymerized unit (3) accounts for 5% by weight based on the polymerized unit (1). % or less, - and - (C) degree of polymerization is 6
In the range of 00 to 1.500, satisfies the following. Regarding requirement (A'), polymerized unit (1) and polymerized unit (2)
The ratio of polymerized units (2
) is 0.4 to 1.5 mol% (polymerized unit (1
) is 99.6 to 98.5 mol %), the process is the same as requirement (A). Regarding the requirement (A'), in addition to the polymerized units (1) and (2), there is another polymerized unit (3) that is compatible with the polymerized unit (2) derived from a monomer copolymerizable with acrylonitrile, Present in up to 5% by weight, based on polymerized units (1). Polymerized units (3) are preferably present in an amount of 3% by weight or less based on the same criteria. As the polymerized unit (3), preferably, for example, the following formula (
3) Here, R is a hydrogen atom or a methyl group, and Y is a group represented by the formula -〇〇X (where X is a hydrogen atom, a sodium atom, or a methyl group) -, -0COCH3
, -CONH,, -C,H,, -CHzSOsNa, and -C@HaSO3N &, can be mentioned. The acrylonitrile polymer used in the present invention, a monomer that provides the polymerized unit (1) by cleavage of a double bond, a monomer that provides the polymerized unit (2), and optionally the polymerized unit (3). It can be produced by polymerizing monomers giving the following in predetermined amounts. The acrylonitrile polymer may be polymerized by any known method such as aqueous polymerization, emulsion polymerization, or solution polymerization. Furthermore, regarding requirement (B), any of the above acrylic fibers used in the present invention has an elongation rate at 260° C. of lθ% or less in the relationship between temperature and elongation rate measured under elevated temperature. The preferable elongation rate is 6% or less. The acrylic material used in the surface material of the present invention has excellent heat resistance and less sagging under high environmental conditions than conventional acrylic materials. Furthermore, the acrylic fibers used in the surface material of the present invention generally have favorable properties in terms of heat-resistant color fastness, and the heat-resistant color fastness (dry heat 120°C x 48 hours) is preferably at least grade 3, more preferably indicates at least grade 3.5. The acrylic fiber used in the surface material of the present invention is further unique in that it exhibits such excellent heat resistance compared to conventional acrylic fibers. The acrylic fiber used in the surface material of the present invention preferably has the following properties. The dry relaxation contraction rate at 210°C is preferably 3% or less, more preferably 1
% or less. Young's modulus is preferably 400 to 700
kjf/rn is, more preferably 500-6
00 kllfl■■2. The tensile strength is preferably 2 to 51/d, more preferably 3 to 42/d. The tensile elongation is preferably 35% or more, more preferably 35 to 60%. The acrylic iiiui used in the surface material of the present invention can be selected from the acrylonitrile polymers specified in (A) or (A') above, such as (1) the acrylonitrile polymer specified in (A) or (A') above. A copolymer spinning dope is extruded through an orifice of a spinneret to produce a trickle of the spinning dope, (2) the trickle is solidified and stretched 5 to 10 times to produce a drawn yarn, and (3) the drawn yarn is drawn. It can be produced by a method characterized by heating the yarn to shrink it by 3 to 25%, and (4) subjecting the obtained shrink yarn to a drying process. It goes without saying that the spinning dope used in step (1) above can be prepared by dissolving the acrylonitrile polymer in a solvent, but it can also be a polymerization solution containing the polymer obtained as a result of polymerization. In the latter case, it is desirable to employ a polymerization reaction system that can be used as a spinning stock solution for wet spinning by simply recovering unreacted monomers from the polymerization solution. The spinning method in step (1) above may be any known method such as wet spinning, dry-wet spinning, dry spinning, or semi-melt spinning. Wet spinning or dry spinning is particularly preferred. These spinning methods are known per se, and for example, wet spinning is described in Japanese Patent Publication No. 167.410, Japanese Patent Application Laid-Open No. 167.411, Japanese Patent Application Laid-Open No. 1972-210,
The method disclosed in Japanese Patent Application Laid-open No. 011, Japanese Patent Application Laid-open No. 58-132107, is employed. Regarding the dry method, for example, JP-A-49-
Publication No. 1.665 or Special Publication No. 59--21.711
As for the method described in the above publication and the dry-wet method, the method described in Japanese Patent Application Laid-open No. 51-92316, etc. are employed. No matter which spinning method is used, the spinning dope is processed in step (1).
, which is extruded from the spinneret to form a trickle of spinning dope. In wet spinning, the trickle is forced into the coagulating liquid,
In dry spinning, the rivulet is extruded into a hot gas atmosphere, and in the wet-dry method, the rivulet is extruded into a gas atmosphere and then introduced into a coagulating liquid. Next, in step (2), the trickle is stretched 5 to 10 times while undergoing solidification as described above. Stretching can be carried out in one stage or in multiple stages. The stretching ratio of each stage in multi-stage stretching is appropriately selected within a range where the total ratio is 5 to 10 times. The preferred stretching ratio is 6 to 8 times. If the stretching ratio is less than 5 times, the tensile strength of the fibers will be insufficient, and if it exceeds 10 times, single fiber breakage will easily occur and fibrillation will occur. The drawn yarn obtained in step (2) is then subjected to a washing step (in the case of wet and wet-dry spinning) or oiled, if necessary, and then guided to the heating step of step (3). In step (3), the drawn yarn is heated to shrink by 3 to 25%. If this shrinkage is less than 3%, the tensile elongation of the fiber will be insufficient;
If it exceeds 5%, high temperature drying becomes necessary, which is not economical. When the spinning in step (1) is carried out by wet spinning, this shrinkage can be carried out using hot water or warm heat before the so-called pre-drying step before subjecting the drawn yarn to the crimper. Alternatively, it can be carried out in a pre-drying step. The resulting shrink yarn is then dried in step (4). If the shrinkage is carried out in or immediately before the so-called pre-drying step as described above, this step (4) corresponds to the so-called post-drying which is carried out after crimping if necessary. do. The acrylic fiber used in the surface material of the present invention obtained by m1< is cut into a predetermined length using a cutter. The electric power pet surface material of the present invention is distinctive in that it contains the above-mentioned novel acrylic fibers with excellent performance. Such acrylic fibers are preferably used in the facing material in an amount by weight of at least IO, more preferably at least 30% by weight. A surface material containing at least 10% by weight of acrylic fibers is advantageous because it can take advantage of the vivid color development and warm texture of the acrylic fibers. Fibers that can be mixed with acrylic fibers include hoods, such as wool, polyester, and nylon! ! I! Examples include fibers with a good diameter. According to the present invention, there is also provided an electrified carpet using the above surface material of the present invention on the outermost or outer surface. The structure of the surface material may be any known structure, such as a non-woven fabric made by needle punching or the like, a woven fabric such as a pile fabric made by tufting, or a knitted fabric in some cases. The electric force pet of the present invention may be in the form of a heater, or it may be made up of a separate heater body and force bar carpet.
It may also be in the shape of a square. (Example) The present invention will now be described in detail in two examples. Note that unless otherwise specified, parts and percentages are by weight. Analysis methods for various physical property values in the present invention and the following examples -
The measurement method or definition is as follows. [Polymer amount jiJ 1) When the polymerization unit formula (3) did not have -So or M, the following method was used. i) {CHzc H} Iris ■ CH. M: Proportion c1 of hydrogen atoms or -equivalent cations in the polymer [wt%l was determined by the following measurements and calculations. First, polymer A [gl (about 1-g)
was accurately weighed and dissolved in dimethylformamide (JIS special grade). Next, the mixture was mixed and stirred with a strong acid type cation exchange resin (50 to 100 mesh, 3 [gl]) for 1 hour, and then the resin was filtered using a glass filter. Furthermore, the above oral fluid was collected using a potentiometric titration device (Hiranuma Sangyo COM-101 model).
8. Titrated using N NaOH. Further, a blank test was conducted under the same conditions and corrections were made. ] 81 However, A1: Polymer amount [gl, 33, 8, N NaOH sample titer [mlc,; 8, N NaOH blank test titer [m] 11D,; Molecular weight fl of polymerization unit formula (2); 18 , NaOH titer of N) R (CH*-c) Formula (3) R: hydrogen atom or methyl group Y COOX, -ocOcHx, -CONH,, -C,H. X: Proportion β of hydrogen atoms, sodium, and methyl groups in the polymer, 1% by weight] was determined by the following measurements and calculations. First, add 0.5 g of polymer to dimethyl sulfoxide (JI
S special grade) to make a 50g/1 solution. CaF
An infrared spectrophotometer (Shimadzu IR-430
) at 2.500 to 1.850 cm-” and 1.85
An infrared spectrum in the region of 0"1.500 cm-" was recorded. Polymer unit formula (3
) absorbance (1,500 ~ if Y has -〇〇-
C=0 stretching vibration absorption band of 1.800 cm-, -C,H,
If the
Calibration of the absorbance ratio obtained by mixing the monopolymers of the polymer unit formulas (1) and (3) in various ratios in advance by the above method to calculate the ratio of the absorbance of the 2.240 cm-" absorption band Obtained from the line. i) Proportion of polymerization unit formula (1) to polymerization units.

[Weight %] is γ=-100 (lIt÷β1), and using these, the polymer composition 1 molar ratio] was calculated according to the following formula. γ, ′/β, /lt@-(K, γ, 153-06)/(
Klβm/Et)/Ktat/Du
) However, γ, ′ and γ1: Polymer unit formula (
1) Proportion [mol%l and [wt%] β, ' and Ill: Proportion in polymer Unit formula (3)
[mol % 1 and 1 weight %] a1' and σ,: proportion of polymer unit formula (2) in the polymer 1 mol %] and [weight %] E1: molecular weight D1 of polymer unit formula (3); Molecular weight Ks of polymerization unit formula (2); l/ ((γ, 153-06) + (β, /El
)+(rl/DI)) 2) When Y in the polymerization unit formula (3) is -CH, So3Na or -〇@HBS O3N a, the following method was used. i) The proportion gz [wt% l-] of the polymer unit formula (2) in the polymer was determined by the following measurements and calculations. Measurements and calculations were carried out according to method 1) (■). However, the absorbance of the polymer unit formula (2) was the 1.666 am-'' absorption band, and a homopolymer of the polymer unit formula (2) was used instead of the polymer unit formula (3) to create the calibration curve. ■) Polymerization Proportion of unit formula (3) in the polymer I1.[
Weight %l was determined by the following measurements and calculations. Measurements and calculations were performed according to method i) of 1). p, [wt%] - [(("8.)x f zx(n z
-C,)[mllXE! XI O-”)/AIIXI
00 However, A: Polymer amount [gl, B2: 18a N Na OH sample titer [ml]
c.; 8. Appropriate amount of N NaOH blank test [mllE: molecular weight f of polymer unit formula (3): 18, titer of N(F)NaOH i) Polymer composition [molar ratio] according to method i) of l)
was calculated. γ2′/βz/ t2= (Kgγ, 153-06)/
(X Xβ*/ E x) / (K t a t7D
3) However, γ28 and γ2: Polymerization unit formula (1) that occupies the polymer
The proportion of the polymerized unit formula (3) in the polymer (r mole %) and [wt% J α2' and σ,; the proportion of the polymerized unit formula (3) in the polymer The ratio of (2) [mol% 1 and [wt% J E2: molecular weight of polymerization unit formula (3) D2: molecular weight of polymerization unit formula (2); l/((y, 15 3.0 6) + (β2/
E
Special grade) was dissolved in about 50 m-1 to make a solution of Tec[g/11]. Using an Ostwald viscometer in a constant temperature bath kept at 30"0, the falling seconds A of the above solution and the falling seconds B of dimethyl formaldehyde were measured. The degree of polymerization P was determined by the following calculation. Relative viscosity vrel=A/B Specific viscosity vsp=9rel-1 Viscosity average molecular weight Mv = (vsp/C) /1.5
Xl O- P=Mma/i However, average polymerized unit molecular weight m=(5106xγ+EXβ
+DXtr)/100 C[mol/1F -C/m where γ: Proportion of polymer unit formula (1) in the polymer [mol%] β: Proportion of polymer unit formula (3) in the polymer [mol% ] a: Proportion of polymer unit formula (2) in the polymer [mol%
E: Molecular weight of polymerization unit formula (3) D: Molecular weight of polymerization unit formula (2) [Relationship between temperature and elongation measured at elevated temperature J The apparatus used is shown in FIG. 2. Total length of fiber is about 30d and length is 80mm.
Make a loop of mm (40 mm 12 when folded in half), hold it using clip 3 inside the heating cylinder which is open to the atmosphere above and below, and use a wire to place a load of 25 mg under the heating cylinder.
/d (approximately 1,500 mg14). Next, the temperature was raised from around 30°C at an average rate of 40°C/min, and the load position was tracked with the camera 5 and recorded together with the temperature. FIG. 1 shows the relationships measured using this method for several acrylic fibers. Elongation rate E%] is (displacement of load [mml/40 [
mml ) xi 00. [Heat-resistant color fastness] 1) Acrylic fibers with 30 to 150 m of nicut-resistant fibers are soaked in hot water at about 60°C.
Degreasing was carried out three times at a bath ratio of 1:200. The above fibers were added to a dye solution whose pH was adjusted to about 4.5 with acetic acid-sodium acetate (the dye brand and OWF are shown in Table 1) at a bath ratio of 1:100 at about 60°C, and the temperature was raised to 85°C ( (approx. 25 minutes) -85℃ maintenance (approximately 1
0 min) -98°C temperature increase (approx. 15 min) -98°C maintenance (approx. 1O
I felt good about it. Next, the fibers were cooled to about 40°C, washed three times with room temperature water at a bath ratio of 1:200, and then subjected to centrifugal dehydration and oiling.
Approximately 40°C, bath ratio 1:200, oil agent for the above fiber manufacturing process)
~ Dehydration (the oil agent owf (L3%) ~ Drying approximately 80℃ x 3
It took time. After cooling to room temperature, the hand carded fibers were subjected to dry heat treatment at 120° C. for 48 hours. After cooling to room temperature, gray scale CJ for discoloration and fading is assisted by color scale for discoloration and fading.
Discoloration and fading were determined according to ISLO 804) and indicated in the range of best and worst. Table 1 1 Color 1 Red I Yellow 1 Blue Brown Dye brand DiACRYL Same left Same left Same left RED
, GRL GOLDEN BLIIE red/
YELLOW/BLUE N cone YELLOW GR
L-N = 27/40n 332) Electric force - Pet surface material Carpet cut into 20cm squares is heated to dry heat at 120℃ x 48cm.
I took the time. Next, after cooling to room temperature, the color change and fading gray scale (JIS L
Discoloration and fading were determined using O804).

[Relaxation contraction rate]

A fiber bundle of about 600 mm was made with a total of about 9000 d of fibers, and marks were made at 11 intervals of 500 mm under a load of 0.1 g/d (about 900 g) at room temperature. The unloaded fiber bundle was treated with dry heat at 210° C. for 30 minutes without applying tension. A load of 900 g was applied again to the fiber bundle that had been cooled to room temperature, and the mark interval A [mml] was measured. Relaxation contraction rate [%] is ((50G-A)1500) x 10
Calculated using 0. [Tensile strength and elongation, Young's modulus] Based on JIS L 1015, constant speed extension type testing machine (
The measurement was performed using a Toyo Baldwin UTM-M model). Examples 1 to 3 and Comparative Examples 1 and 2 (1) Acrylic polymers having the composition and degree of polymerization shown in Table 2 were dissolved in dimethylformamide (hereinafter abbreviated as DMF), and the polymer concentration was adjusted to 26. The spinning stock solution adjusted to 5% by weight was prepared into a spinning dope with a circular cross section of 0.1 mm in diameter.
Coagulation bath at 20℃ from the orifice of a million-hole spinneret
After extruding into DMF/water = 60/40 (weight ratio) and taking it off at a spinning draft of 0.4, D 1vI F /
Water-30/70 (weight ratio) Stretched 8 times at 85°C. Subsequently, after washing with water and applying oil, roller drying was performed at 150° C. while applying 15% shrinkage. After washing, oil application, crimp application, crimp setting (wet heat at 120°C), and post-drying were performed to obtain 10 d of single yarn acrylic fibers. The above fibers cut to a length of 152iam were dyed brown (light color) as shown in Table 811, and semi-worsted spinning was carried out.
The eighth grade spun yarn was obtained. Next, a base fabric made of polypropylene fiber (thread density, warp 22 threads/inch, warp 15 threads/inch) was tufted (pile weight 3501/m), and latex (solid content 48% by weight) was applied to the back side of the obtained fabric. Polymer Jjl 12% by weight, calcium carbonate 35% by weight,
After applying anti-aging agent (1% by weight) 6001/■2, 1
It was dried at 40°C for 15 minutes. The obtained acrylic fibers and electric force-PET surface material had the characteristic values shown in Table 2. In addition, the meaning of multi-pillar in the said Table 2 is as follows. *1 Abbreviation for sodium 2-acrylamide-2-methylpropanesulfonate, *2 Abbreviation for methyl acrylate, Book 3: Relationship between temperature and elongation rate measured at elevated temperatures 2
Value at 60℃, Ne4 Dry Heat 120aaX48WfM%1M, Zero5 Dry Heat 21
Heating was carried out at 0°C for 30 minutes, and methallylsulfonic acid sorta was used in place of Zero 65 AMPS. (Effects) The surface material of the present invention containing novel acrylic fibers and the electric force-pet of the present invention using the same are unprecedented in that they have the vivid color development and warm texture of acrylic fibers. Surface materials and electrical power - pets. (Ll Mi, n\Kame 5N) Procedural amendment December 4, 1999 Commissioner of the Japan Patent Office Fumi Tsuyoshi Yoshida 1, Indication of the case 1999 Patent Application No. 282872 2, Name of the invention Electric Power - Pet and The surface material 3. Relationship with the case of the person making the amendment Name of patent applicant (095) Kanebo Co., Ltd. 4, Agent, 107 5. Date of amendment order (voluntary) 6. "Brief explanation of the drawing" column (1)
1 and 2 of the accompanying drawings are incorporated. (2) Add the following between lines 17 and 18 on page 30 of the specification.

[Brief explanation of the drawing]

FIG. 1 shows the relationship between temperature and elongation for the acrylic fiber used in the present invention and a conventional acrylic fiber equivalent. FIG. 2 is a schematic diagram of the apparatus used to measure the relationship of FIG. 1. ”

Claims (4)

[Claims] 1. (A), (a) The following formula (1) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ The polymerized unit represented by and the following formula (2) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ Here M is a hydrogen atom or It consists essentially of a polymer unit represented by (b) which is one equivalent of a cation, and (b) the polymer unit (2) is 0.4 to 1. It accounts for 5 mol%,
(c) consists of an acrylonitrile copolymer with a degree of polymerization in the range of 600 to 1,500, and (B) in the relationship between temperature and elongation rate measured at elevated temperatures, 260 to 1,500.
A surface material for an electric carpet, characterized in that it contains acrylic fibers having an elongation rate of 10% or less at °C. 2. (A') (a') A polymer different from the polymerized unit of the above formula (1), the polymerized unit of the above formula (2), and the polymerized unit of the above formula (2) derived from a monomer copolymerizable with acrylonitrile. It consists essentially of the polymerized unit represented by unit (3), and (b') the polymerized unit (2) is 0.4 to 1.5 mol based on the total of the polymerized unit (1) and the polymerized unit (2). % and the polymerized unit (3) accounts for 5% by weight or less based on the polymerized unit (1), and (c) the degree of polymerization is in the range of 600 to 1,500. , and (C) in the relationship between temperature and elongation rate measured under elevated temperature, 260
A surface material for an electric carpet, characterized in that it contains acrylic fibers having an elongation rate of 10% or less at °C. 3. An electric carpet having the facing of claim 1. 4. An electric carpet having the surfacing material of claim 2.