JPS609970A - Adhesive composition for lining carpet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive composition for carpet backing which has improved blister resistance, viscosity stability over time and adhesive strength. For backing treatment, an aqueous dispersion in which a filler, a dispersant, a stabilizer, a thickener, etc. are added as necessary to a polymer dispersion is used as an adhesive.

This adhesive may be left for a long time before use, and may be exposed to high temperatures of nearly 400℃ in the summer. However, if the viscosity stability of the adhesive is poor, when it is used for carpet lining, the amount of application may be uneven, or the adhesive may not penetrate into the carpet pile. Because of the subtle effects, phenomena such as a lack of a desirable hand feel, a decrease in the adhesive strength of the backing fabric, and pile removal occur, resulting in a significant decrease in product value. Therefore, it is very important to stabilize the viscosity of adhesives over time.

On the other hand, during the carpet drying process, when the water in the adhesive applied to the carpet evaporates, a portion of the adhesive is lifted, causing a bulge (blister) on the back side of the carpet, a so-called blister phenomenon that is often observed. However, this significantly impairs the appearance of the carpet, and a great deal of effort is expended in removing the blisters.

However, in recent years, drying at high temperatures and high wind speeds has become commonplace in order to increase productivity in carpet manufacturing.9
In addition, due to the shortage of jute fabrics, the base fabric is shifting to polypropylene products with low breathability and water absorption. As a result, the Plisme phenomenon has become more likely to occur9, and this has become a very serious hindrance in the carpet manufacturing process.

As a carpet lining adhesive composition with poor blister resistance and oral viscosity stability, Japanese Patent Publication No. 5S-4419
No. 1 discloses a combination of an orcappolysiloxane compound and a nonionic surfactant, and a blend of a polyalkylene oxylide compound in JP-A-5O-1391361C. However, in these compositions, Improving blister resistance using these methods usually results in lower adhesion strength than when this method is not used, and the requirements for adhesion direction, blister resistance, and viscosity stability over time are important. A friend who has difficulty balancing demands.

Therefore, in order to develop an adhesive composition for carpet lining that has excellent blister resistance, oral viscosity stability, and strong adhesive strength, the inventors of the present invention have conducted intensive studies and found that The combination of a conjugated diene copolymer latex containing body units and an amino acid compound produces surprising black ink even when an organopolysiloxane heat-sensitive agent is used, and it has different υ, blister resistance, and aging properties than conventional trends. The present invention was completed based on the discovery that it is possible to obtain an excellent composition that has good stability and does not have a decrease in adhesive strength.

An object of the present invention is to provide an adhesive composition for carpet backing which has improved blister resistance, viscosity stability over time, and adhesive strength, and the object is to provide an adhesive composition for carpet backing which has improved blister resistance, viscosity stability over time, and adhesive strength.
A carpet backing adhesive composition comprising a conjugated diene copolymer latex containing a monomer unit represented by (representing an alkyl group of ~8) and a filler, wherein the copolymer is present in the adhesive composition. This is achieved by using an adhesive composition containing 0.005 to 5 parts by weight of a lyamino acid compound per 100 parts by weight of latex solid content.

Conjugated diene polymer latex used in the present invention Monomers represented by δ (in the formula, R1 and R1 represent hydrogen + ai to B alkyl groups), diene monomers, and if necessary copolymerizable with these. It is a latex obtained by copolymerizing vinyl monomers.

δ and R2 are the same as above) as a monomer represented by 1tN
- methylol acrylamide, N-methylol methacrylamide, H-n-butocy7methylacrylamide,
Examples include N-IL-butoxymethyl methacrylamide. The content of this component in the copolymer is 0.1 to 10% by weight, preferably 0.5 to 5% by weight. If the weight ratio is less than 0.01, the adhesive force will not be improved, and if it exceeds 10 weight, the oral viscosity stability will decrease.

Conjugated diene monomers include butadiene, isoprene,
Examples include 16-pentadiene, and the content in the copolymer is 10 to 999 φ. Vinyl monomers that can be copolymerized with the above two types of monomers include aromatic vinyl monomers such as U-styrene and α-methylstyrene, unsaturated nitrile monomers such as acrylonitrile and methacrylonitrile, and methyl Acrylic acid and methacrylic acid esters such as (meth)acrylate, ethyl (meth)acrylate, butyl acrylate, acrylic acid, methacrylic acid, itaconic acid,
Examples include monomers having unsaturated carboxylic acids such as maleic acid and functional groups such as hydroxyl groups, amide groups, glycidyl groups, and sulfone groups. The content in the copolymer is 0 to 899% by weight.

Examples of the copolymer latex used in the present invention include butadiene-styrene-(meth)acrylic acid-N-methylol(meth)acrylamide copolymer, butadiene-styrene-N-methylol(meth)acrylamide copolymer, and butadiene-styrene-(meth)acrylic acid-N-methylol(meth)acrylamide copolymer. -Styrene-methyl methacrylate-N
-Methylol(meth)acrylamide copolymer, bumediene-styrene-(meth)acrylic acid-N-rubutoxymethylacrylamide copolymer, pumediene-styrene-imecon[-N-methylol(meth)acrylamide copolymer Latex such as

The amino acid compound used in the present invention is not particularly limited as long as it has a carboxyl group and an amino group in the molecule, such as glycine, alanine, valine, leucine,
α-amino acids such as isoleucine, phenylalanine, and proline; oxyamino acids such as serine, threonine, tyrosine, and oxybroline; sulfur-containing amino acids such as cysteine, cystine, and methionine; acidic amino acids such as aspartic acid and glutamic acid; and bases such as lysine and arginine. Examples include amino acids such as β-alanine, γ-aminobutyric acid, anthranilic acid, and P-aminobenzoic acid. These amino acid compounds can be used as they are or as salts such as alkali salts.

The amount used is 10 solids of conjugated diene copolymer latex.
The range of 0 parts by weight to 0.05 parts by weight to 5 parts by weight is preferred. 00
If it is less than 5 parts by weight, a sufficient effect for preventing blisters will not be obtained, and a sufficient effect will not be obtained for suppressing the odor of the latex composition during and after drying, which is one of the characteristics of the present invention. If it exceeds 5 parts by weight, the oral viscosity stability of the adhesive composition will be poor and it is not practical. Preferably 0
It is 1 to 3 parts by weight.

In the present invention, an organopolysiloxane heat-sensitizing agent can be used if necessary. The organoborisiloxane heat-sensitive agent is a compound used as a heat-sensitive coagulant, and is, for example, a compound described in Japanese Patent Publication No. 44191/1983.

Particularly preferred compounds are alkylene oxide modified organopolysilokibnes. The amount used is usually 3 parts by weight or less, preferably 0.005 to 15 parts by weight, per 100 parts by weight of solid content of the copolymer latex. If it exceeds 3 parts by weight, the adhesive composition will have poor viscosity stability over time, making it difficult to obtain a practical composition.The amount of amino acid to be used should be within the above range.

An optimum amount may be used depending on the content of the functional monomer in the copolymer latex.

Fillers used in the present invention include heavy calcium carbonate, aluminum hydroxide, and clay.

Mention may be made of Merck and light calcium carbonate.

Among these, heavy calcium carbonate or aluminum hydrate, which are commonly used for carpet treatment, are preferably used in an amount of less than 50 parts by weight, which is usually 50 to 600 parts by weight per 100 parts by weight of solid content of the copolymer latex. , the blister resistance is insufficient, and if it exceeds 600 layers, it is difficult to obtain a satisfactory adhesive strength.
In the composition of the present invention, it is not necessary to add a nonionic surfactant in order to improve the viscosity stability over time, but the addition is not limited to this. However, addition of a large amount of surfactant inevitably leads to a decrease in adhesive strength, causing the present instep to lose its characteristics.

The adhesive composition of the present invention may further contain conventional compounding agents such as dispersants, stabilizers, anti-aging agents, vulcanizing agents, vulcanization accelerators, antifoaming agents, thickeners and pigments, if necessary. can be included.

The adhesive composition of the present invention can be applied to all textiles or fabrics in which a polymer dispersion is applied to the back side of knitted carpets, knitted carpets, hook carpets, etc. to bond piles of carpets or bond secondary base fabrics to carpets. Can be applied to non-woven carpets. This composition can be applied to carpets by white backing, mesh pasting, jute pasting, pasting of a secondary backing material such as a synthetic material such as polypropylene, or the like. In addition, floss backing etc.
It is also possible to use it in a foamed state for the above purposes.

Next, the present invention will be specifically explained with reference to Examples.

All parts of ingredients in each example are based on solids weight.

EXAMPLE The monomer mixtures listed in Table 1 were polymerized by a conventional emulsion polymerization method at 50C to a reaction rate of 95% to obtain eight types of copolymer latexes.

Table 1 100 parts by weight of these copolymer latexes were added with water and a second
An adhesive composition for carpet backing was prepared according to the formulation shown in the table. The viscosity of these adhesive compositions over time was measured using a B-type viscometer.

On the other hand, 1 s kg of the obtained composition was applied to a tufted carpet whose base fabric was polypropylene and whose pile was nylon (filament loop pile, 1/8 inch gauge product).
(WICT)/crystal 1, then backed with 9 oz.
After drying for 10 minutes in a dryer at 0C and hot air speed of 8-7 seconds, the appearance of adhesive blisters was visually observed.

The adhesive strength of each composition was 1.4 kp on the above carpet.
(wrr)/z'', backed with jute, rolled and crimped, dried for 15 minutes in a dryer at a temperature of 130C and a hot air speed of 2crystals/sec.
The peel strength of jute was measured using a carpet that had been left for a period of time according to J-Ko 5L-1021. The above results are shown in Table 2.

From the results in Table 2, it can be seen that latex containing N-methylol acrylamide as a copolymer component alone has extremely poor blister resistance (Experiment No. 1), but by adding an amino acid compound, both blister resistance and adhesive strength improve. It can be seen that the results are improved (Experiments Nos. 7 to 9).

Furthermore, even if a copolymer latex outside the scope of the present invention is used in combination with an amino acid, a carpet lining adhesive with improved blister resistance and adhesive strength cannot be obtained.0Patent Applicant: Zeon Corporation

Claims (1)

[Claims] An adhesive composition for carpet backing comprising a filler and a conjugated diene copolymer latex containing a monomer unit represented by the formula (wherein R and R1 represent hydrogen and an alkyl group of c1 to 8). An adhesive composition for carpet lining, characterized in that 0.05 to 5 parts by weight of a diamino acid compound is blended in the adhesive composition per 100 parts by weight of the solid content of the copolymer latex◇