JPS593593B2 - Adhesive composition for carpet lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive composition for carpet lining having excellent adhesive strength, water resistance and viscosity stability over time.

More specifically, it contains a nonionic surfactant and an organopolysiloxane, has an average particle size of 1,400 to 2,500 particles, and the number of particles with a particle size of 400 to 1,200 particles of the total particle size is 10 to 40%, 1,500 to 300 particles.
The main ingredients are a synthetic copolymer latex composed of IO or 90% of the particles with a particle size of 0 and a filler, and p
The present invention relates to a carpet backing adhesive composition in which H is 6 to 9.

Currently, tufted carpets are made by fixing fiber bundles (piles) of nylon, acrylic, wool, etc. to a primary base fabric such as polypropylene flat yarn using a tufting machine, and then applying carboxyl-modified styrene-butadiene copolymer latex, calcium carbonate, etc. to the back side of this fabric. , inorganic fillers such as aluminum hydroxide, thickeners such as sodium polyacrylate, carboxymethyl cellulose, sodium tripolyphosphate,
It is manufactured by applying an adhesive composition containing an inorganic dispersant such as sodium hexametaphosphate as a main component, then bonding a secondary base fabric such as jute and drying.

The purpose of applying such an adhesive composition is to fix the pile to the primary base fabric and adhere the secondary base fabric to the back side, and also plays the role of forming a preferable texture and imparting dimensional stability. There is.

The role of the adhesive composition as described above is largely dependent on the synthetic copolymer latex used as the binder.
The selection of the desired synthetic copolymer latex has become very important.

The advantages of using carboxyl group-modified styrene-butadiene copolymer latex are (1) no pollution caused by volatilization of organic solvents, (2) no risk of fire, (
3) The adhesive has a low viscosity at high concentrations and is easy to process, (4) it is low in price, and (5) the adhesive has appropriate permeability into the pile. The disadvantage is that it is necessary to evaporate water, which has a large amount of latent heat.

For this reason, large-sized dryers are used in the carpet manufacturing process, and drying at high temperatures and high wind speeds has become commonplace, consuming a lot of energy, and energy costs are increasing.

Recently, in order to reduce energy costs and increase productivity, attempts have been made to increase the solids content of adhesives and shorten the drying time.

In order to increase the solids content of adhesives, it is common practice to fill them with a large amount of filler.

In addition, the price of synthetic copolymer latex has skyrocketed in recent years, and the importance of filling more fillers in order to reduce the cost of adhesives has increased and is now being widely considered. .

However, it is well known that increasing the filler content generally decreases the binder proportion, resulting in a decrease in adhesive strength, and a similar decrease in water resistance as the coating layer becomes more porous. .

The adhesive strength of the adhesive needs to be good in order to fix the pile to the primary base fabric and adhere the secondary base fabric to the back side as described above.

Moreover, due to the recent diversification and functional sophistication of carpet products, new materials that have not been seen before are increasingly being used for pile, primary base fabric, and secondary base fabric, and these materials are no longer suitable for conventional materials. Adhesives using carboxyl-modified styrene-butadiene copolymer latex as a binder do not necessarily provide sufficient adhesive strength.

For example, BCF nylon carpets, which have been increasing rapidly in recent years, do not have the required adhesive strength, so efforts are being made to increase the amount of application in the manufacturing process, but there are limits, so it is difficult to develop adhesives with good adhesive strength. This has become an urgent task.

In addition, good water resistance is also important in order to prevent secondary base fabric peeling and pile loss when washing carpets. Adhesives that contain adhesives have limitations as increasing filler levels result in porosity.

Therefore, there has been a desire in the art to develop an adhesive composition with good adhesive strength, water resistance, and viscosity stability over time.

In general, adhesive compositions containing heat-sensitive gelling agents have poor viscosity stability over time and cannot be put to practical use, and this tendency becomes particularly pronounced when the solids content of the adhesive composition is increased. There was a limit to increasing the solids content of adhesive compositions.

As a method for improving the viscosity stability over time of adhesive compositions containing organopolysiloxane, which is a type of heat-sensitive gelling agent, a method of adding a nonionic surfactant was recently proposed in JP-A-52-95749. However, according to the studies of the present inventors, when the solid content of the adhesive composition is high, such as 75% to 85%, the viscosity stability over time is not good, and the high solid content adhesive composition It was insufficient in that it was not possible to produce.

The present inventors conducted intensive studies to develop an adhesive composition with excellent adhesive strength, water resistance, and viscosity stability over time, and surprisingly found that it contains a nonionic surfactant and an organopolysiloxane, and contains an average particle The particle size is 1400 to 2500, and the number of particles with a particle size of 400 to 1200 of the total number of particles is 10 to 40%, 1500 to 3000.
An adhesive composition containing a synthetic copolymer latex composed of 60 to 90% of particles having a human particle size and a filler with a particle size of 6 to 9 exhibits extremely excellent adhesive strength and water resistance. The present invention was achieved by discovering the previously unknown fact that the viscosity stability over time is also good.

Since such synthetic copolymer latex is very stable and has a low latex viscosity, it is possible to increase the solid content of the latex, and it is surprising that a heat-sensitive synthetic copolymer latex with a latex solid content of 60% can be produced. be.

Furthermore, since the viscosity of so-called slurry mixed with fillers is low, it is possible to produce adhesive compositions with a high solids content, and according to studies by the present inventors, it is possible to produce adhesive compositions with a solid content of up to 85%. Moreover, the viscosity stability over time was extremely good.

The reason why the viscosity stability over time is improved when a synthetic copolymer latex with such a particle size distribution is used is not clear, but because the latex particles have a particle size distribution, the latex particles and filler particles are tightly packed. It can also be considered that the purpose is to become

Various piles of nylon, acrylic, wool, etc. are fixed to a primary base fabric such as polypropylene flat yarn using a tufting machine, the adhesive composition according to the present invention is applied to the back side of the pile, and a secondary base fabric such as jute is bonded and dried. This carpet has extremely good adhesive strength and water resistance, and even when filled with a large amount of inorganic filler such as calcium carbonate, it has excellent adhesive strength and water resistance.
Shows water resistance.

The reason why the adhesive composition of the present invention has good adhesive strength and water resistance is that because the adhesive composition has heat sensitivity, the coating layer does not turn into a heat-sensitive gel when drying and so-called binder migration does not occur. This is thought to be due to the fact that the coating layer is dried while the latex particles remain uniformly dispersed.

Therefore, the adhesive composition of the present invention can be used even for pile materials such as BCF nylon, for which adhesive compositions using ordinary carboxyl group-modified styrene-butadiene copolymer latex as a binder do not have sufficient adhesive strength. , excellent pile adhesion and adhesion to the primary base fabric can be obtained, and problems of secondary base fabric peeling and pile shedding do not occur when the carpet is washed.

Since the adhesive composition of the present invention has excellent adhesive strength and water resistance even when filled with a large amount of inorganic filler such as calcium carbonate, it is possible to reduce the cost of the adhesive composition.

In addition, even if the solid content of the adhesive composition is increased, the viscosity stability over time is good, so a high solid content adhesive composition can be stably produced.
Since the drying time can be shortened, it contributes to energy saving and productivity improvement, and has great industrial value.

Examples of the synthetic copolymer latex included in the adhesive composition of the present invention include styrene-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex, and vinyl chloride copolymer latex. Among the common latexes that can be used for carpet lining, styrene-butadiene copolymer latex is most preferred.

The synthetic copolymer latex contained in the adhesive composition of the present invention is produced by copolymerizing ethylenically unsaturated carboxylic acid, and 0, It must contain 5 to 5% by weight.

When the amount of ethylenically unsaturated carboxylic acid is less than 0.5% by weight, good adhesive strength cannot be obtained and viscosity stability over time decreases.

On the other hand, when it exceeds 5% by weight, water resistance decreases, which is not preferable.

Examples of ethylenically unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, crotonic acid, and cinnamic acid, with acrylic acid, methacrylic acid, itaconic acid, and fumaric acid being preferred.

The organopolysiloxane contained in the synthetic copolymer latex used as the binder of the adhesive composition of the present invention is disclosed in Japanese Patent Publication No. 40-21427 and Japanese Patent Publication No. 47-19604.
No. 3, US Pat. No. 3,246,339, US Pat. No. 32
Examples include compounds described in No. 5514, British Patent No. 1,141,867, etc.
A copolymer of dimethylpolysiloxane and ethylene oxide is particularly desirable.

The organopolysiloxane is preferably used in an amount of 0.05 to 5.0 parts by weight based on 100 parts by weight of the solid content of the synthetic copolymer latex.

If it is less than 0.05 parts by weight, good adhesive strength,
It does not exhibit water resistance, and if it exceeds 5.0 parts by weight, the viscosity stability over time decreases, which is undesirable.

As the nonionic surfactant contained in the synthetic copolymer latex used as the binder of the adhesive composition of the present invention, any surfactant having an ethylene oxide group or a glopylene oxide group can be used, such as polyoxyethylene. Examples include nonylphenyl ether, polyoxyethylene octylphenyl ether, and holoxyethylene nonyl ester.

The amount used is preferably 0.5 to 3.0 parts by weight per 100 parts by weight of the synthetic copolymer latex solid content; if it is less than 0.5 parts by weight, the viscosity stability over time will decrease,
Exceeding parts by weight is not preferable because heat sensitivity is impaired and adhesive strength and water resistance are reduced.

The average particle size of the synthetic copolymer latex contained in the adhesive composition of the present invention should be 1,400 to 2,500 particles.

If it is less than 1,400, the viscosity of the latex will increase, which is undesirable, and if it exceeds 2,500, the thickening properties with respect to thickeners will decrease, which is undesirable.

Also, of the total number of particles, the number of particles with an average particle diameter of 400 to 1,200 people is 10 to 40%, and the number of particles with an average particle diameter of 1,500 to 3,000 people is 60 to 90%.
Must consist of %.

If the composition ratio is other than these, the viscosity stability over time will decrease,
The viscosity of the latex and the viscosity of the slurry also increase, which is undesirable.

When polymerizing the synthetic copolymer latex contained in the adhesive composition of the present invention, it can be produced by a known method in an aqueous medium using an emulsifier, a polymerization initiator, a chain transfer agent, etc. In order for the adhesive composition to exhibit the excellent viscosity stability over time as described above, the particle size distribution of the synthetic copolymer latex must be as described above.

The synthetic copolymer latex having the above particle size distribution is produced by blending a synthetic copolymer latex with an average particle size of 400 to 1,200 particles and a synthetic copolymer latex with an average particle size of 1,500 to 3,000 particles. However, it is also possible to produce it using a general method used in the pore-forming polymerization.

Anionic and/or nonionic surfactants are used during polymerization.

As the anionic surfactant, those used in the production of ordinary carboxyl group-modified styrene-butadiene synthetic copolymer latex may be used, such as higher alcohol sulfate ester salts, alkylbenzene sulfonates, aliphatic sulfonates. Examples include.

Further, as the nonionic surfactant, ordinary polyethylene glycol alkyl ether type, alkyl ester type, alkylphenyl ether type, etc. are used.

The initiator may be water-soluble initiators such as ammonium persulfate, sodium persulfate, potassium persulfate, oil-soluble initiators such as benzoyl peroxide, or redox initiators such as hydrogen peroxide-ferrous sulfate. Can be used.

Chain transfer agents, chelating agents, inorganic salts, etc. that are known in emulsion polymerization are used.

As the inorganic filler contained in the adhesive composition of the present invention, those commonly used in carpet backing adhesives, such as heavy calcium carbonate, titanium oxide, and aluminum hydroxide, can be used alone or in combination.

The amount of inorganic filler is 1 solid content of synthetic copolymer latex.
The amount is preferably 100 to 600 parts by weight, and if it is less than 100 parts by weight, heat resistance will deteriorate, which is undesirable, and if it exceeds 600 parts by weight, adhesive strength, water resistance, and elasticity will deteriorate, which is undesirable.

The thickener is used for the purpose of obtaining a predetermined viscosity of the adhesive composition, and can be used alone or in combination with polysulfur acrylate, carboxymethylcellulose, polyacrylamide, etc., and in the present invention, it is not particularly limited. It is not something that will be done.

The pH of the adhesive composition of the present invention is preferably 6 to 9.

If the pH is less than 6, it is undesirable because the storage stability of the latex and the viscosity stability of the adhesive composition over time decreases, and when it exceeds 9, it is undesirable because adhesive strength and water resistance decrease.

Alkaline substances such as sodium hydroxide and potassium hydroxide can be used for pH adjustment.

Furthermore, the adhesive composition of the present invention may contain fillers such as calcium carbonate and aluminum hydroxide, dispersants, bactericides, and anti-aging agents, if necessary.

The present invention will be explained in more detail with reference to Examples below.

Note that in the examples, parts and % indicating proportions mean parts by weight and % by weight.

In addition, the method for analyzing the acid content in the latex and the method for testing the physical properties of the adhesive composition used in the Examples were carried out in accordance with the methods described below.

Analysis of acid content in latex 3 g of latex from which residual monomers had been removed was weighed into a beaker, and 1.2 cc of a 20% aqueous solution of a nonionic surfactant (Nukol 864, manufactured by Nippon Nyukazai Co., Ltd.) was added.

Special grade methanol-ion exchange water 1:1 mixture 30-40
Add CC.

0.01N hydrochloric acid 6cc~1 while stirring with a stirrer
Add 0cc.

After thorough stirring, neutralization titration is performed with a 0.01 N aqueous sodium hydroxide solution to obtain a correlation curve between - and the amount of the sodium hydroxide aqueous solution added, and the acid content in the latex is calculated.

Test method for measuring physical properties of adhesive compositions (1) Viscosity Stability over time The adhesive composition was left at 40°C for 10 days, and the viscosity was measured using a BL type viscometer with a No. 4 rotor and 6 rp ■ to determine the initial viscosity. compared with.

The smaller the viscosity change, the better.

(2) Adhesive strength The adhesive composition was applied uniformly to the original acrylic loop carpet, with the primary base fabric being polypropylene and the pile being acrylic, at a rate of 1300 wet/volume, and then 7 oz. Created a dry carpet.

Place this undried carpet in a hot air dryer at a temperature of 130°C.
It was left in for 5 minutes to dry.

After removing the carpet from the dryer, leave it in a constant temperature room at 23°C and 50% humidity for 24 hours.
The adhesive strength was measured according to 1021.

(3) Water Resistance (Wet Adhesive Strength) After dry carpets were prepared according to the method in (2), they were immersed in room temperature water for 10 minutes and wet adhesive strength was measured according to JISL-1021.

(4) Elasticity After drying carpets were prepared according to method (2), the carpets were folded and the rebound resilience was observed.

5 is the best elasticity, 1 is poor. The higher the number, the better.

(5) Heat resistance After making a dry carpet according to the method of (2), 1
The sample was placed in a hot air dryer at 20°C for 10 days and the degree of yellowing was observed.

5 is the best as the amount of yellowing is also small. 1 is the most likely to yellow.

The higher the number, the better. Average Particle Size of Latex An electron micrograph of the latex particles was taken, and the particle size of 250 particles was measured, and the number average particle size was calculated and taken as the average particle size.

Example 1 First, 80 parts of water was added to a pressure-resistant polymerization container equipped with a dropping device and a stirrer.
Sodium dodecylbenzenesulfonate 0.2 parts, particle size 300 people seed latex (styrene (70)-butadiene (3O) copolymer latex) 4.4 parts, sodium ethylenediaminetetraacetate 0.05 parts, potassium persulfate 1.0 parts of sodium hydroxide, 47 parts of styrene, 50 parts of butadiene, 3 parts of acrylic acid, and 0.7 parts of tertiary dodecyl mercaptan were charged, and after sufficient nitrogen purging, the mixture was heated to 90°C. The mixture was reacted for 6 hours.

A latex with an average particle size of 850 particles and a solid content of 55% was obtained.

The pH of the resulting latex was adjusted to 8.0 with an aqueous sodium hydroxide solution, and then steam and nitrogen blowing was performed to remove residual monomers.

The average particle diameter of the latex ■ obtained in this way was 85
There were 0 people.

Similarly, latex (2) was prepared using the following recipe.

The average particle size of latex ■ was 2,700 particles.

Latex number ■ Water 80 parts Sodium dodecylbenzenesulfonate 0.2 type latex (particle size 300 people) 0.15 Sodium ethylenediaminetetraacetate 0.05 Potassium persulfate
1.0 Sodium hydroxide
0.2 styrene
47 Butadiene
50 Acrylic acid 3.0 Tertiary dodecyl mercaptan 0.7 Next, nonionic surfactant agent (manufactured by Dai-Kogyo Seiyaku, Neuken EA-17OA)
1.0 part of organopolysiloxane (manufactured by Toshi Silicone Co., Ltd., 5H-3748) was added.

The obtained latex O had a solid content of 8.01, a solid content of 55%, an acrylic acid content of 2.98, an average particle size of 2230, and a latex viscosity of 128 cps.

Next, using this latex 0, adhesive composition (2) was prepared according to the following formulation, but the slurry viscosity was 4350 Cp.
S, and ... was 8.3.

Next, the viscosity stability over time, adhesive strength,
Water resistance, elasticity, and heat resistance were measured according to the test methods described above.

The results are shown in Table-8.

As is clear from Table 8, the adhesive composition (2) of the present invention is superior in viscosity stability over time, adhesive strength, and water resistance.

Adhesive composition formulation Latex (solid content) 100 parts Heavy calcium carbonate (5S-30 manufactured by Nitto Funka Co., Ltd.) 450 Silicone antifoaming agent (5H5561 manufactured by Toshi Silicone Co., Ltd.) 0.3 Sodium tripolyphosphate 0.5 Poly Sodium acrylate (Toagosei Aron A-20P) 0.7 water
Appropriate amount Total solid content: 80% Comparative Example 1 A latex having a uniform particle size was polymerized in the same manner as in Example 1 using the following recipe and using the same monomer composition as in Example 1.

The pH of the latex ■ prepared by removing residual monomers and adjusting it in the same manner as in Example 1 was 8.0, the solid content was 55%, the acrylic acid content was 2.98, the average particle size was 2240, and the latex viscosity was 310 cps. it was high.

Polymerization prescription water 80 parts Sodium dodecylbenzene sulfonate 0.2 type latex (particle size 300 people) 0.24 Sodium ethylenediaminetetraacetate 0.05 Potassium persulfate 1.0 Sodium hydroxide
0.2 styrene
47 Butadiene
50 acrylic acid 3.
0 Tertiary dodecyl mercaptan 0.7 Polymerization temperature 90°C Polymerization time 6 hours Nonionic surfactant - 1.0 parts (Neuken EA-170 manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) Organopolysiloxane (5H3748 manufactured by Toshi Silicone Co., Ltd.) 1.0 Adhesive composition C was prepared according to Example 1 using this latex ■.

The slurry viscosity was as high as 13,500 cps.

Moreover, - of ■ was 8.2. Then, adhesive composition C
The physical properties of were evaluated according to Example 1.

The results are shown in Table-8. As is clear from Table 8, Comparative Example Adhesive Composition (2) is found to have poor viscosity stability over time.

Example 2 Using the latex prepared in Example 1, the addition level of nonionic surfactant and organopolysiloxane and p
Latex samples [F] were prepared by changing H as shown in Table 1.
～■ was created.

Next, using these adhesive compositions 0 to 2, adhesive compositions 1 to 2 were prepared according to the formulation of Example 1, and the physical properties were evaluated in the same manner as in Example 1.

The results are shown in Table-8.

As is clear from Table 8, adhesive compositions (1) to (2) of the present invention are superior in viscosity stability over time, adhesive strength, and water resistance.

Comparative Example 2 Using the latex prepared in Example 1, latex samples ■ to ■ were prepared in the same manner as in Example 2 by changing the addition levels and pH of nonionic surfactant and organopolysiloxane as shown in Table 2. .

Adhesive compositions (1) to (2) were prepared using these latexes (1) to (2) and evaluated according to Example 1.

The results are shown in Table-8.

As is clear from Table 8, comparative adhesive compositions ■, ■, ■
It can be seen that the adhesive strength and water resistance are inferior, and the viscosity and stability over time are inferior.

Example 3 According to Example 1, a latex with an average particle size of 850 OA and a latex with an average particle size of 270 OA were prepared using the polymerization recipe shown in Table 3, and the mixture was blended so that the ratio of the former to the latter was %. The obtained latex was adjusted in exactly the same manner as in Example 1 to obtain latexes (1) to (O) having a solid content of 55% and an average particle size of 2230A.

Adhesive compositions (1) to (2) were prepared using these latexes (1) to (0) according to the formulation of Example 1, and their physical properties were evaluated.

As is clear from the results shown in Table 8, it can be seen that the adhesive compositions (1) to (phase) of the present invention are excellent in viscosity stability over time, adhesive strength, and water resistance.

Comparative Example 3 According to Example 1, except that the monomer composition was changed as shown in Table 4, everything was the same as in Example 1, and two types of latex with average particle diameters of 8.50 and 2700 were created. , After blending these latexes in the proportions shown in Tables 4 to 4, Example 1
The same post-conditioning as above was carried out to obtain latex [with] to [with].

Next, the latexes ① to ① were made into adhesive compositions ① to ＠ in the same manner as in Example 1, and their physical properties were evaluated.

The results are shown in Table-8. As is clear from Table 8, adhesive compositions ① and [Co., Ltd.] are inferior in adhesive strength and viscosity stability over time, and ① and ③ are inferior in water resistance.

Example 4 Latexes with different particle sizes were polymerized in the same manner as in Example 1 except that the amount of seed latex charged into the reactor was changed.
A latex with a solid content of 55% was obtained.

The mixture was blended in the proportions shown in Table 5, the pH was adjusted in exactly the same manner as in Example 1, and 1.0 part of nonionic surfactant (
Final latexes (1) to (2) were prepared by adding 1.0 part of organopolysiloxane (5H3748, manufactured by Toshi Silicone Co., Ltd.) (manufactured by Nippon Nyukazai Co., Ltd., Nucor 506).

Then, the adhesive composition@
-[Phase] was prepared and its physical properties were evaluated.

The results are shown in Table-8. As is clear from Table 8, it can be seen that the adhesive composition of the present invention, Sho~@, is excellent in viscosity stability over time, adhesive strength, and water resistance.

Comparative Example 4 A monomer mixture having the same composition as in Example 1 was polymerized according to Example 4 by changing the amount of seed latex added, and latex was blended to obtain a latex having an average particle size and particle size distribution as shown in Table 6. It was created.

These latexes were prepared in the same manner as in Example 4,
Latex sump/Shima-Cg was created.

Adhesive compositions ~■ were prepared according to Example 1 using latexes ■~■, and their physical properties were evaluated.

The evaluation results are shown in Table-8.

As is clear from Table 8, adhesive compositions α to O have poor viscosity stability over time.

Example 5 Adhesive composition O-■ was prepared using the latex ■ prepared in Example 1 according to the formulation shown in Table 7.

Next, in accordance with Example 1, the physical properties of adhesive compositions ① to [phase] were evaluated.

The results are shown in Table-8. As is clear from Table 8, the adhesive compositions of the present invention @~[phase] are excellent in viscosity stability over time, adhesive strength, and water resistance.

Comparative Example 5 An adhesive composition Φi-<■ was prepared using the latex ■ prepared in Example 1 according to the formulation shown in Table 7.

The evaluation results for adhesive compositions ① to ① are shown in Table 8.

As is clear from Table 8, ■ indicates poor heat resistance, and ■ indicates poor adhesive strength, water resistance, and elasticity.

Claims (1)

[Claims] 1. Contains a nonionic surfactant and an organopolysiloxane and has an average particle diameter of 1,400 to 2,500 particles, and the number of particles with an average particle diameter of 400 to 1,200 particles out of the total number of particles is 10 to 40. %, the number of particles with an average particle diameter of 1,500 to 3,000 people is 60 to 90%, and the main ingredients are a synthetic copolymer latex and a filler, and the adhesive strength, water resistance and viscosity are 6 to 9. An adhesive composition for carpet lining, which is characterized by good stability over time. 2. Synthetic copolymer latex contains 0.5% ethylenically unsaturated carboxylic acid out of the total amount of polymerizable monomers used as raw materials.5.
The carpet backing adhesive composition according to claim 1, which is a styrene-butadiene copolymer latex containing 0% by weight. 3. The carpet backing adhesive composition according to claim 2, wherein the ethylenically unsaturated carboxylic acid is acrylic acid, methacrylic acid, itaconic acid, fumaric acid, or maleic acid. 4. The carpet backing adhesive composition according to claim 1, wherein the organopolysiloxane is a dimethylpolysiloxane-ethylene oxide copolymer. 5. The carpet backing adhesive composition according to claim 1, wherein the organopolysiloxane is contained in an amount of 0.05 to 5.0 parts by weight based on 100 parts by weight of the synthetic copolymer latex solid content. 6. The adhesive composition for carpet lining according to claim 1, wherein the nonionic surfactant is present in an amount of 0.5 to 3.0 parts by weight based on 100 parts by weight of the synthetic copolymer latex solid content. 7. The adhesive composition for carpet lining according to claim 1, wherein the filler is ground calcium carbonate or aluminum hydroxide. 8. The carpet backing adhesive composition according to claim 1, wherein the filler is present in an amount of 100 to 600 parts by weight based on 100 parts by weight of the synthetic copolymer latex solids.