FI111558B - Carpet backing layers derived from block copolymer compositions - Google Patents

Abstract

Recyclable carpets, obtainable by means of the application of a block copolymer composition, comprising at least: a) a block copolymer, containing at least two terminal poly(vinylaromatic) blocks and at least one internal poly(conjugated diene) block, the original ethylenical unsaturation in which may optionally be selectively hydrogenated, which block copolymer may optionally be grafted with a polar entity; b) a non-aromatic plasticizing oil; c) a terminal block compatible resin on the backside of a carpet fabric; and block copolymer compositions for the manufacture of such carpets.

Description

111558

Carpet backing layers derived from block copolymer compositions

The invention relates to carpet backing layers based on block copolymers derived from vinyl aromatic and conjugated diene, and more particularly styrene and butadiene and / or isoprene, respectively.

More particularly, the invention relates to a mat backing pad for polypropylene, polyester or polyamide rugs.

Until now, the backing layers of polypropylene, polyester or polyamide rugs have been obtained mainly by applying to the back of the carpet either a styrene-butadiene latex carboxylated copolymer optionally blended with a blowing agent and a vulcanizing agent, followed by curing step, or applying PVC plastisol to the back of the carpet.

Such preliminary rugs can be obtained by conventional knotting of polypropylene, polyester or polyamide yarns through a fabric of the same material or, in any case, a compatible starting material. The backing layer serves to anchor these knotted yarns.

In addition, it is generally known that in conventional methods of forming a carpet backing layer, it may be necessary to use primers to secure the backing layers or other methods to improve adhesion, such as co-blast or flame treatment.

For example, JP-A-02 255 739 discloses a continuous sheet-like, crosslinked foam resin composition composition comprising 10 to 55% by weight of a block copolymer, with two terminating blocks consisting of 35 styrene polymers and a middle block consisting of ethylene-butylene-ethylene-mixed copolymer, 40 to 2 111558 85% by weight of polypropylene based resin and 5 to 40% by weight of polyethylene based resin, which foam can be bonded to a plastic film or layer, another foam or different materials by means of a separate adhesive or binder on top of membrane surface materials, such as metal chair, paper, nonwovens of natural or synthetic fibers, vinyl films and the like, to provide a composite material which can be used inter alia as a buffering material or as a backing for household products, e.g. work as a backing layer. However, from this application it was clearly stated that in order to obtain sufficient adhesion between this continuous sheet-like crosslinked foam and the foil surface to which the foam is to be adhered, the surface of the continuous sheet-crosslinked foam must be subjected to corona blasting or flame treatment.

It should be noted that both the foaming of the starting composition containing block copolymer, polypropylene and polyethylene, and the subsequent bonding of this foamed sheet to the surface of the second layer, require additional process steps and entails additional costs.

Recent reports by public authorities and environmental organizations have strongly emphasized the need to make many plastic products from fully recyclable components. The recycling operation generally involves heating and melting ordinary waste polymer products at temperatures above the melting point of each component. The resulting molten plastic mass is then used to form a new structure or product by conventional extrusion molding and the like. Temperatures used in the recycling operations will result in carbonization and / or discoloration of even small amounts or residual amounts of background compositions when heated over long periods at temperatures above 175 ° C or for shorter periods greater than about 200 ° C, e.g. at the temperatures necessary to blow-molding this recycled polymer, thereby reducing the quality of the recycled plastic or darkening its color visually.

5 Such measures are not possible in the case of the backing layer of the carpet used hitherto.

It should be noted that the backing polymer composition of these mats must be sufficiently compatible with said matting fabric polymers to provide acceptable physical properties of the recycled polymer blend in reusable products.

Therefore, it is a primary object of the present invention to provide carpets which must be capable of being completely recycled in a manner that is environmentally friendly and at minimal cost.

Another object of the present invention is to provide an economically advantageous method of making this rug.

WO 85/05116 discloses pressure-sensitive adhesives containing a block copolymer. The problem disclosed in the publication is related to the poor heat resistance of pressure sensitive adhesives containing block copolymer as well as the marked tendency to creep.

U.S. Patent 4,695,493 discloses carpet accessories that can be manufactured without the need for heat treatment of bumpy areas. The hot melt used in such carpets has a composition comprising 30 to 45% styrene-unsaturated hydrocarbon-styrene block copolymer, 35 to 50% tackifying resin, 1 to 10% 30 reinforcing resin, 5 to 20% plasticizer and 0 to 5% disintegrating resin. antifungals.

U.S. Patent 3,772,234 discloses petroleum wax compositions comprising: a) petroleum wax predominant petroleum wax 35 and 4,115,558 b) 7.5-30% by weight of the composition based on a block copolymer having at least a substantially completely hydrogenated polybutadiene block, prior to hydrogenation in the range of 13 to 45% 5, and in particular in the range of 13 to 17% (column 1, rows 30 to 35) and 25 to 31% (column 4, rows 33 to 39).

Although it is mentioned in the publication that these petroleum wax compositions can in principle be used as paper or film coatings or carpet backing due to their firm bond to paper or other fibrous products and to metal foils or continuous webs such as glass paper, it is noted that the petroleum wax types used in the compositions are certainly not sufficiently compatible with the polypropylene or polyester mat fibers to allow easy recycling by the conventional method of producing new products from the waste.

In addition, the viscosities of these compositions at 20 centipoise at 300 ° F (about 149 ° C) were clearly considered too low for the target carpet backing coating method.

It will be apparent to one skilled in the art that in order to produce such recyclable rugs, the backing layer of the carpet must simultaneously meet several requirements: a) the backing composition should be sufficiently compatible with all other constituents of the carpet, b) the backing composition should have a low viscosity 30 nodes so that the nodes are sufficiently anchored under the selected process conditions.

In the case of knotted pile carpets, this anchoring should be more than 3 kg, while in the case of cut pile, the anchoring should be more than 1 kg. Normal treatment temperatures are in the range of 150-200 ° C, 5111558 c) The backing composition must be such that the backing of the carpet is sufficiently strong under operating conditions; d) The backing composition of the carpet must not become tacky under storage, transport or use conditions of the final carpet; ) it should be possible, for economic reasons, to add significant quantities of dispersed fillers and / or flame retardants, such as calcium carbonate or silica, magnesium hydroxide or alumina trihydrate, to this mat backing composition.

As a result of extensive research and experimentation, it has now surprisingly been found that target recyclable rugs comprising a thermoplastic mat of polypropylene, polyester or polyamide yarns are obtained by applying to the back of the mat a block blend polymer composition comprising at least two aapol a poly (vinyl aromatic) block and at least one internal poly (conjugated diene) block of 20, wherein the original ethylenically unsaturated bond can be optionally hydrogenated selectively, and to which block copolymer may optionally be grafted with a polar group, (b) a non-aromatic oil; "25 is 30 to 250 parts by weight per 100 parts by weight of block copolymer, c) a poly (vinyl aromatic) block compatible resin selected from the group consisting of coumarone-indene resin, polyphenylene ethyl special resin, polystyrene resins, poly-α-methylstyrene resin, vinyltoluene-copolymer resin, polyindene resin and poly (methylindene) resin, in an amount of 30 to 200 parts by weight per 100 for,

The amount of the block copolymer composition of the present invention to be applied to the back of the mat is in the range of about 100-1600 g / m 2 of the backing surface of the mat, preferably in the range of 200-1000 g / m2.

The block copolymers suitably found to be applied are preferably linear tri-block copolymers or multi-branched (more than two branches) radial or stellar block copolymers, the blocks of which are mainly derived from styrene and butadiene and / or isoprene. These poly (conjugated diene) blocks may optionally have been substantially hydrated, i.e., in that more than 80% of the ethylenically unsaturated bonds have been hydrogenated.

By "substantially obtained" is meant that the actual monomer of the respective individual blocks may have been mixed with small amounts of the second co-15 monomer, and more particularly small amounts of the actual monomer of the other blocks.

Examples of vinylaromatic monomers may be selected from styrene, α-methylstyrene, p-methylstyrene, m-methylstyrene, o -methylstyrene, p-tert-20-butylstyrene, dimethylstyrene, vinylnaphthalene and the like, and mixtures thereof, the monomers may be selected from butadiene, isoprene, piperylene and the like and mixtures thereof.

Of these monomers, styrene and butadiene or isoprene or mixtures thereof are preferred. In practice, those containing substantially pure poly (styrene) blocks and substantially pure poly (butadiene) or po-30 ly (isoprene) blocks have been found to be the most preferred block copolymers.

Examples of such suitably useful block copolymers include Cariflex, Kraton D and G block copolymers (Cariflex and Kraton are trademarks) and more preferably Cariflex KX 139, Ca-35 riflex TR-1102, Kraton G 1652, Kraton G 1726, block copolymers.

7, 111558

It should be noted that mixtures of hydrogenated and non-hydrogenated or partially hydrogenated block copolymers or additionally non-hydrogenated block copolymers or partially hydrogenated block copolymers can also be used as starting materials for this block copolymer composition.

It should be noted that the poly (conjugated diene) blocks present in the block copolymers used in the compositions of the present invention may have been selectively hydrogenated and / or grafted with a polar group such as carboxylic acids or derivatives thereof, epoxy compounds, silane compounds, amines or amides.

Representative examples of block copolymers grafted with unsaturated acid derivatives are known from U.S. Patent Nos. 4,007,311, 4,264,747 and EP-A-0 085 115, 0 173 380, 0 215 501, 0 301 665.

The polar groups are preferably grafted onto selectively hydrogenated poly (conjugated diene) moieties.

More preferably, these hydrogenated poly (conjugated diene) moieties are grafted with unsaturated carboxylic acid or its esters or anhydrides.

Preferred examples of such grafting agents include maleic anhydride, fumaric acid or its esters, itaconic acid or its esters or anhydride, acrylic acid or methacrylic acid or esters of these acids and preferably glycidyl acrylate. More preferably, maleic anhydride or acrylic acid esters are used.

30 Examples of commercial block copolymers grafted with maleic anhydride include Kraton FG 1901 and FG 1921 X.

Mixtures containing unmodified hydrogenated block copolymers and modified hydrogenated block copolymers, and preferably block copolymers having similar or more structurally related basic blocks, may also be used in the hot melt compositions useful in the present invention. It should be noted that the use of functionalized, selectively hydrogenated block copolymers as component 5 in the hot melt compositions used in accordance with the present invention is only necessary in order to achieve the desired compatibility with the polar thermoplastic polymers present in the starting mat yarns. Particularly in the case of polyamide mat 10, said modified hydrogenated block copolymers are used alone or in admixture with unmodified block copolymers.

In addition, such individual block copolymer grades may themselves be actually blends having 15 major parts by weight of the tri-block copolymer as defined above and a small proportion (<20% by weight) of a two-block copolymer derived from the actual precursor block copolymer partial) coupling and termination, or they may consist of only three to 20 block copolymers.

The apparent molecular weight of the terminating blocks optionally present in the selectively hydrogenated block copolymers is typically in the range of 3,000 to 100,000 and preferably in the range of 5,000 to 20,000, and the apparent molecular weight of the inner, optionally selectively hydrogenated poly (conjugated diene) in the range of 10,000 to 300,000 and preferably in the range of 30,000 to 100,000. Initially prepared poly (conjugated diene) blocks usually contain from 5 to 50 mol% vinyl groups derived from 1,2-polymerization with respect to conjugated diene-30 molecules and more preferably 5 to 15% in the case of non-hydrogenated block copolymers and 25 to 40% in the case of substantially completely hydrogenated block copolymers.

The complete block copolymer used in accordance with the present invention contains normally bound vinyl aromatic in an amount of from 20 to 60% by weight and preferably from 25 to 50% by weight. The apparent molecular weight of the whole block copolymer is normally in the range of 20,000 to 350,000, and preferably in the range of 5,000 to 200,000, and more preferably in the range of 40,000 to 150,000.

Various emollient oils may be used as component (b) in the compositions of the present invention.

Among the emollients which have been found to be useful, petroleum oils, olefin oligomers and low molecular weight polymers, and vegetable and animal oils and their derivatives may be mentioned.

Useful oils derived from petroleum are relatively high temperature boiling agents containing only a small proportion of aromatic hydrocarbons, preferably less than 20% and more preferably less than 15% by weight of the oil, and most preferably this oil contains no aromatics. Among the oligomers, mention may be made of polypropylene, polybutenes, hydrogenated polyisoprene, hyd-20-linked polybutadiene, polyperylene and copolymers of piperylene and isoprene having an average molecular weight in the range of 350 to 10,000.

Among vegetable and animal oils, glyceryl esters of conventional fatty acids and their polymerization products may be mentioned.

Examples of preferred paraffin oils are Primol 352 (Primol is a trademark), Catenex SM 925, Catenex SM 956 (Catenex is a trademark), and Napvis and Hyvis (trademarks) are polyolefins having a molecular weight range of 500 to 6,000.

Various resin-compatible resins selected from the group consisting of coumarone-indene resin, polyphenylene ethers, and more particularly poly (2,6-dimethyl-1,4-phenylene) may be used as component (c) in the compositions of the present invention. ether), polystyrene resin, vinyl toluene-alpha-methyl-11,1558 styrene copolymer resin, polyindene resin and poly (methyl indene) resin.

Examples of such commercial resins include Hercues HM 100, Hercures A 120, Hercures A 5 100, Endex 160, Kristalex F 120, Kristalex F 5140, Nevchem NL 140 and Piccotex 120. (Hercures, Endex, Kristalex, Nevchem and Piccotex are trademarks. )

Preferred molding resins are optionally substituted polystyrene resins.

The weight ratio of components a), b) and c) in the hot melt composition used as starting material in the process of the present invention is usually in the range of 30 to 200 parts by weight, preferably 80 to 170 parts by weight, and more preferably 120 to 170 parts by weight 100 parts by weight and 30 to 150 parts by weight, and preferably 75 to 125 parts by weight, of the resin-compatible block per 100 parts by weight of the block copolymer.

The block copolymer compositions 20 described above may be applied to the backing surface of the carpet either by one of the many methods known in the art for applying the hot melt composition or by applying the above described fine powder obtained by cryogenically disclosed in EP-A-93203636.1, filed December 22, 1993; cosmopolymer composition into a suitable layer and heating this layer, e.g., by IR irradiation, to obtain a continuous backing layer.

It has been found that these hot melt compositions used as starting materials provide an optimal melt viscosity of less than 500 Pa at conventional processing temperatures of 150 to 200 ° C, and preferably of 0.5 to 100 Pa-s at this temperature range. In addition, it has been found that so-35 provides a final backing hardness of 40 to 60 Shore A, a hot melt to be applied to the backing surface of 11111558 carpets to provide an economically advantageous method of making the carpet of the type described above. g / m2 and preferably 200-100 g / m2.

Note that the hot melt composition may optionally contain, in addition to the three main components mentioned above, one or more other additives such as stabilizers, fillers, colorants and lubricants.

Among the stabilizers or antioxidants optionally used in accordance with the present invention, inhibited phenols of high molecular weight as well as multifunctional phenols such as sulfur and / or phosphorus-containing phenols may be mentioned. Inhibited phenols are known to those skilled in the art and can be characterized as phenolic compounds which also contain sterically spaced radicals very close to the hydroxyl group of phenol. In particular, tertiary butyl groups or amyl groups are generally substituted on at least one position ortho to the phenol hydroxy group on the benzene ring.

Representatives of such stabilizers are commercially available under the trademarks Sumilizer and Irganox, e.g., Sumilizer GM and GS, Irganox 1010.

Other additives which may be used are inorganic and organic fillers which are well known in the art. Examples of such excipients include calcium carbonate, aluminum silicate, clay, talc, titanium dioxide, bentonites, kaolin, barytes, mica, silica, barium sulfate or mixtures thereof. A preferred filler is calcium carbonate. These excipients may be included in amounts of up to 400 parts by weight per 100 parts by weight of the block cosmopolymer and preferably from 150 to 50 parts, with a particle size of> 1 μτη, preferably within the range of 5-50 μτη .

12 111558

Examples of commercial fillers of this type include Durcal 5 and Millicarb (both trademarks).

It will be surprising to one skilled in the art that when hot melt is applied to a carpet fabric according to the present invention by one-step manufacturing techniques, such as hot melt coating, extrusion coating or powder coating, mat backing surfaces 10 such as polypropylene nodes are provided. anchored very well. Depending on the weight of the backing layer, node anchoring in the range of 3 to 8 kg is achieved. In addition, the binding of the backing layer to the top layer and the optional second backing layer may be greater than 3 N / 5 cm as determined by a 180 ° T peel strength test.

On the other hand, the carpet backing layers obtainable according to the present invention were found to have a favorable flexibility combined with suitable rug strength throughout. It is preferred that the total thickness of the backing layer is in the range of 0.1 to 5 mm, preferably in the range of 0.2 to 0.5 mm.

In some applications of recyclable rugs made in accordance with the present invention, for example in the case of car rugs, the hot melt composition or powder composition can be applied directly to the mat ** 25 fabric in one step.

In embodiments of carpets which require greater wear resistance, for example, for home knotted or plant carpets, a fabric pre-coating composition having a melt viscosity in the range of <20 Pa, preferably as a first step, is applied to the fabric. At conception temperatures of 150-120 ° C. and having a melt viscosity in the range of 0.5 to 15 Pa-s at this same temperature range, followed by the second step of applying a second layer of a hot melt copolymer block composition having a relatively higher melt viscosity.

In such embodiments of carpets where greater wear resistance is required, it is most advantageous to apply this block copolymer composition as a pre-coating layer by hot melt extrusion coating, whereupon the next layer is applied as a fine powder which is subsequently bonded to the continuous layer by heat treatment.

The amount of pre-coating composition to be applied to the backing surface of the mat may range from 100 to 1600 g / m2, preferably from 100 to 500 g / m2. The resulting carpet backing surfaces show very good knot anchoring and good bonding of the yarns, resulting in good wear properties.

It should be noted that in another alternative embodiment of the present invention, an additional second polypropylene or jute backing layer or mesh for special applications 20 may be applied to the backing surface. This screen may be expediently applied in the same coating step (s) as the backing layer itself.

It should be noted that the outer surface of the hot melt composition applied as a layer to the carpet may, after cooling, if desired, be coated with a relatively thin layer which acts as a non-slip and / or adhesive thin layer to adhere and hold the carpet accurately, e.g.

The application of the block copolymer composition may be accomplished by a variety of conventional application techniques. Preferably, a hot melt extrusion coating process or a powder coating process is used, more preferably in combination with a subsequent receiving roller device, to compress the 35 sheets and the mat.

14, 111558

It should be noted that another feature of the invention is the readily and perfectly recyclable mats having a backing layer derived from the block copolymer compositions defined above having a hardness of the backing layer of 40 to 60 Shore A and the backing layer comprising a hot melt composition in the range 100-1600 g / m2. and having a backing layer having a thickness of 0.1 to 5 mm, preferably 0.2 to 0.5 mm, in which the base carpet is made of polypropylene or polyamide or polyester yarns.

Another aspect of the invention are block copolymer compositions for use as a backing mat for a carpet, which provides a fully recyclable carpet, which in addition has an advantageous combination of properties, and which can be obtained at a relatively low manufacturing cost due to relatively simple backing technology.

Accordingly, the invention also relates to block copolymer compositions for providing a readily and completely recyclable mat, characterized in that the block copolymer compositions comprise: a) 100 parts by weight of a block copolymer containing at least two end poly (vinyl aromatic) and at least one internal poly (conjugated diene) block in which the original ethylenically unsaturated bond may be optionally hydrogenated, b) 30 to 180 parts by weight of a non-aromatic softener. 30 oils, c) 50 to 160 parts by weight of poly a (vinyl aromatic) block compatible resin selected from the group consisting of coumarone-indene resin, polyphenylene ether resin, polystyrene resin, poly-α-methylstyrene resin, vinyl toluene alpha-methylene styrene, .

Preferably, these melt compositions for forming a background on easily and perfectly recyclable carpets comprise: a) 100 parts by weight of a block copolymer comprising at least two terminating poly (vinyl aromatic) blocks and at least one internal poly (conjugated diene) block having the original ethylenically unsaturated bond may have been optionally hydrogenated selectively, 10 b) 80 to 180 parts by weight of a non-aromatic softening oil as defined above, c) 70 to 160 parts by weight of a final block compatible resin as defined above.

Alternatively, the compositions may contain 15 inorganic fillers, and more preferably calcium carbonate, in an amount up to 500 parts by weight.

Such block copolymer compositions may be prepared by methods known per se, such as high shear mixing or heating with heating until the desired melt viscosity is smoked.

Another feature of the present invention are low-rupture recyclable mats, from which reusable products can be made by compression and then extrusion.

The invention is further illustrated by the following examples, without, however, limiting the invention to these embodiments.

Example 1 3 0 The hot melt composition (1) prepared therefrom

by high shear mixing in an extruder containing 70 parts by weight of Kraton G 1652 and 30 parts by weight of Cariflex KX139 [a commercially available styrene-butadiene block copolymer having a molecular weight of 35,000 and a styrene content of 40% At 200 ° C and 5 kg load is 20 g / min (ISO

16 111558 1133)], 140 parts by weight of Catanex SM 925 [commercially available paraffin / naphthalene oil (64/34) having a density at 15 ° C of 867 kg / m3 and a pour point of -15 ° C], 80 part by weight of Kristalex F-120 (a commercially available low molecular weight thermoplastic hydrocarbon polymer obtained largely from alpha-methyl-styrene, softening point 118 ° C), 1 part by weight

Kemamide E (Kemamide is a trademark of a commercially available erucamide (lubricant) with a molecular weight of 335, a density of 0.875 g / ml at 130 ° C) and 1 part by weight of Irganox 1010 having a melt viscosity of 30 Pa at 160 ° C. C and 13 Pa-s at 180 ° C was applied by extrusion coating to the back surface of a loop knotted polypropylene mat, the mat comprising 2-10 loops / cm2 and each loop consisting of about 100-140 strands. The tests were carried out on a carpet coating apparatus using a number of machine rolls.

The hot extruded sheet (melt temperature at the nozzle was 170 ° C) was applied directly to the backing surface of the mat.

The bonding strength between the backing composition and the PP fabric was determined by a T-peel test.

Node anchoring was measured by pulling one knot to detach it from the back surface of the carpet.

25 The measured properties are listed in the table.

Example 2

Hot melt composition (2) containing 100 parts by weight of Cariflex TR-1102, 114 parts by weight of Ca-Tenex SM 925, 80 parts by weight of Kristalex F-120, 200 parts by weight of Durcal 5 (commercial powdered fish) - ** ** SiC), 1 part by weight of Kemamide E and 1 part by weight of Irganox 1010 having a melt viscosity of 82Pa-s at 160 ° C and 32.2 at 180 ° C was applied as described in Example 1. on the back 35 of the same PP rug. The measured properties are listed in the table.

17, 111558

Example 3

Hot melt composition (3) containing 100 parts Cariflex KX 139, 100 parts Ca-Tenex SM 925, 50 parts Kristalex F-120, 200 5 parts Durcal 5, 1 part Ketn-Amide E and 1 part by weight of Irganox 1010 having a su-Lavi sketch of 95.2 Pa at 160 ° C and 30 Pa at 180 ° C were applied as described in Example 1. On the back of PP mat. The measured properties are listed in the table 10.

Example 4

Hot melt composition (4) containing 100 parts Kraton G 1652, 140 parts by weight Primol 352 (commercially available paraffin oil; density at 15 ° C is 15,685 kg / cm 3; melting point is -18 ° C), 100 parts by weight part of the product

Kristalex F-120, 200 parts by weight of Durcal 5, 1 part by weight of Kemamide E and 1 part by weight of Irganox 1010, having a melt viscosity of 156 Pa at 160 ° C and 39 Pa at 180 ° C. s, was applied as described in Example 1 to the backside of the same PP matting. The measured properties are listed in the table.

Example 5

The hot melt composition as defined in Example 1 was applied by extrusion coating to the backside of a polyamide-PET-25 matting, this fabric comprising 10 to 20 pile loops / cm 2 and each loop consisting of 140 strands. The experiment was carried out as described in Example 1. The measured properties are listed in the table.

Example 6 30 Hot melt composition containing 100 parts Cariflex TR KX 139, 30 parts Catenex SM 956, 100 parts Hercures A 100, 1 part Kemamide E and 1 part Irganox 1010 having a melt viscosity of 13 Pa-s at 180 ° C, Levi-35 was applied to the backside of the same PP mat as described in Example 1.

18 111558 A powder hot melt composition (4) was applied on this pre-coating device with a powder particle blender with an average particle size of 350 μτα.

In this way, the anchoring of the knots 5 and the good binding of the strands were achieved in excess of 3 kg.

Example 7

Hot melt composition containing 100 parts by weight of Kraton G 1726, 100 parts by weight of Hercures A

120, 140 parts by weight Catenex SM 925, 50 parts Durcal 5, 1 part Kemamide E and 1 part Irganox 1010 having a melt viscosity of 0.7 Pa * s at 180 ° C , was applied to the back of the same PP matting as described in Example 1. A powder-15 hot-melt hot melt composition (2) was applied over this pre-coating device with an average particle size of 500 µm.

This textile background resulted in excellent knot anchoring, thread binding, and layer separation (ASTM D 3936).

20 Example 8

50 parts for KRG 1726, 50 parts for KRG

1652, 150 parts Hercures A 120, 175 parts Catenex SM 925, 50 parts Durcal 5, 1 part Kemamide E, 1 part Irganox 1010, with a melt viscosity of 25 ° C at 160 ° C. s, was applied to the back of the same PP mat as described in Example 1.

A powder composition (2) was applied over this pre-coating device with an average particle size of this powder of 500 µm.

Excellent node anchoring (ASTM D1335), thread binding [measured with Lisson test (DIN 54322), Drum test (DIN 54323) and Chair Castor test (DIN 54324)], and layer separation force (ASTM D3936) were measured.

35 19 111558

Table

Ingredients of Hot Melt Composition Composition Composition Composition Composition __1__2__3__4_

Kraton G 1652, part by weight__70 ____ 100_

Kraton FG 1901, part by weight _____

Cariflex KX 139, parts by weight__30 ___ 100__

Cariflex TR-1102, parts by weight ___ 100___

Primol 352, parts by weight _____ 140_

Catenex SM 925, parts by weight__140__114__100 ___

Kristaflex F-120, parts by weight__80__80__50__100_

Durcal 5, parts by weight__200__200__200__200_

Kemamide E, parts by weight__1__1__1__1

Irganox 1010, parts by weight__1__1__1__1_

Melting Viscosity 160 ° C 30 82 95.2 156 180 oq 13 32.2 30 39

Node anchoring, kg __> 3 __> 3 __> 3 __> 3_ T-load strength N / 5 cm __ = __-__ = __ 1_

Shore A-hardness, 0 s 44 51 51 47.5 _23 s__37__44__45__46

Tensile strength, Mpa__1,2__1.5__1.4__1.4

Elongation at break,% __ 237__568__565__253

Module 100%, MPa__0,9__0,7__0,6__1 0.8 0.8 • '"- ------ -" ^ —— 1 1

Module 500%, MPa __-__ 1.4__1.2__3_

The following table lists the physical properties of the resulting mixture obtained by tearing and crushing the polypropylene hen with recycled carpet having a backing layer made of the Kraton G block copolymer composition of the present invention. the particles were mixed with a new PP homopolymer. The physical properties of PP homopolymer, copolymer PE and pure recycled carpet are listed below for comparison purposes.

20 111558

New PP-PP homop. New copy- Circ.

homopolym. + rev Lym. (EP) mat ____mat__

Ingredient__1__2 ^ __ 3__41 SS 65001__100__70 __ = __ 100

Carpet ____-__ 30 __-__ SMA 6100 K (copol.) V __: __: __ 100 __-

Bending factor, MPa__1179__914__1004__3 90

Isod impact strength at 23 ° C, kJ / m2 3.1 5.0 6.0 8.5 at 0 ° C 2.1 3.3 4.4 5.8 at -23 ° C 3__3_ / 7__5,0

Melt flow, 230 ° C / 2.16 kg, g / 10 min_______

It is clear from the table above that, after being ruptured and compacted, the recyclable mat can be readily blended with a new PP homopolymer to provide properties similar to the quality of the toughened PP.

»

Claims (21)

111558 Easy and fully recyclable carpets comprising a thermoplastic mat fabric made from polypropylene, polyester or polyamide yarns and a block copolymer composition applied to the back side of the mat, characterized in that the block copolymer composition comprises at least: a) a block copolymer two terminating poly (vinyl aromatic) blocks and at least one internal poly (conjugated diene) block, b) a non-aromatic softening oil in an amount of 30 to 250 parts by weight per 100 parts by weight of the block copolymer, 15 c) a poly (vinyl aromatic) block compatible resin selected from the group consisting of coumarone-indene resin, polyphenylene ether resin, polystyrene resins, poly-α-methylstyrene resin, vinyl toluene-alpha-methylstyrene copolymer resin, poly (indene) resin, polyindene resin, 200 parts by weight lump mixed per 100 parts by weight of polymer, and having a melt viscosity of <500 Pa-s at processing temperatures of 150 to 200 ° C. Recyclable mats according to claim 1, characterized in that the original ethylenically unsaturated bond of the poly (conjugated diene) blocks is selectively hydrogenated. Recyclable carpet according to claim 1, characterized in that the block copolymer composition is applied to the back side of the carpet in the region. · * ^ 100 to 1600 g / m2. Recyclable rugs according to claim 3, characterized in that the block copolymer composition is applied to the back of the carpet in an amount in the range of 35 200 to 1000 g / m 2. 111558 Recyclable mats according to claims 1-4, characterized in that the block copolymer component (a) is a straight-chain triple block copolymer or a branched radial or stellar block copolymer, the blocks of which are mainly of pure or styrene and pure styrene and , respectively. Recyclable mats according to claims 1-5, characterized in that component (a) of the block copolymer 10 comprises selectively hydrogenated block copolymers obtained by grafting unsaturated carboxylic acids or their esters or anhydrides to poly (conjugated diene). Recyclable mats according to claims 1-6, characterized in that paraffin oil is used in the block copolymer composition. Recyclable mats according to claims 1-6, characterized in that the block copolymer composition utilizes low molecular weight olefin oligomers or olefin polymers. Recyclable mats according to claims 1-8, characterized in that poly-α-methylstyrene resin is used as component (c). Recyclable mats according to claims 1-9, characterized in that in the block copolymer composition the weight ratio of components a), b) and c) is in the range of 80 to 180 parts by weight of component b) per 100 parts by weight of the block copolymer. 75-160 parts by weight of component c) per 100 parts by weight of block copolymer. Recyclable mats according to claims 1-10, characterized in that they are obtained from hot melt compositions having a melt viscosity in the range of 0.5 to 100 Pa.s at a treatment temperature of 150 to 200 ° C. 111558 Recyclable mats according to claims 1 to 11, characterized in that they are obtained from a fine powder block copolymer composition which, after application, is melted to a continuous layer 5 by heat treatment. Recyclable mats according to claims 1 to 12, characterized in that the calcium carbonate is incorporated in a block copolymer composition applied as a filler. Recyclable mats according to claims 1 to 13, characterized in that the backing layer has a thickness of 0.5 to 5 mm and a hardness of 40 to 60 Shore A. Recyclable mats according to claims 1-14, characterized in that they are torn. A block copolymer composition for forming a backdrop on easily and perfectly recyclable carpets, characterized in that it comprises: a) 100 parts by weight of a block copolymer comprising at least two terminating poly (vinyl aromatic) blocks 20 and at least one internal poly (conjugated diene) block, b ) 30 to 180 parts by weight of a non-aromatic emollient oil, c) 50 to 160 parts by weight of a poly (vinyl aromatic) block compatible resin selected from the group consisting of • 25 includes coumarone-indene resin, polyphenylene ether resin, polystyrene resin , poly-α-methylstyrene resin, vinyltoluene-alpha-methylstyrene copolymer resin, polyindene resin and poly (methylindene) resin. A block mixed capol according to claim 16. . 30 polymer composition, characterized in that the original ethylenically unsaturated bond of the poly (con, conjugated diene) blocks is selectively hydrogenated. The block copolymer compositions according to claims 16 and 17, characterized in that they comprise modified block copolymers obtained by oxylation of unsaturated carboxylic acids or their esters or anhydrides with poly (conjugated diene) blocks. Block copolymer compositions according to claims 16 to 18, characterized in that the poly (vinyl aromatic) blocks of the block copolymers are obtained from pure styrene and have an apparent molecular weight in the range of 5,000 to 20,000, and the internal poly (conjugated diene) blocks are obtained. of pure butadiene and isopropene and have an apparent molecular weight in the range of 10,000 to 10,300,000 and preferably 30,000 to 100,000. Block copolymer compositions according to claims 16 to 19, characterized in that the poly (conjugated diene) blocks contain 5 to 50% of vinyl groups based on the conjugated diene molecules. Block copolymer compositions according to claims 16-20, characterized in that the complete block copolymers contain bound vinyl aromatic compound in an amount ranging from 20 to 60% by weight. 20 111558