JPS59207978A - Heat seal - 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 the use of copolyamides for laminating textile materials.

Lamination of fibrous materials has been demonstrated on a large scale. For this purpose, as a rule one side of the same or different fabrics is given a hot-melt adhesive and the substrate is heated under pressure so that the fabric is not damaged but the hot-melt adhesive melts at a suitable high temperature. During this process the fabric bond is solidified by heating using a
)EC No. 1253449 and E-C No. 159'423
(See No. 3). There are various conditions that such hot melt adhesives must satisfy. For example, there is a need for so-called steam-resistant hot melt textile adhesives. The reason is that in the manufacture of garments, the final garment product is frequently subjected to steam treatment, and during this time the adhesion must not be adversely affected. Obviously, the hot melt adhesive must also have the properties required by the art, such as washing fastness and dry cleaning resistance. As confirmed by the comparative test below,
Although the prior art copolyamides have outstanding properties with respect to normal tear strength and washing fastness, they have unsatisfactory properties in the steam test C5×60C).

It has been shown here that a particular copolyamide meeting the definition below unexpectedly not only has remarkable normal tear strength and washing fastness, but also gives unexpectedly high values in the steam test. It was discovered that.

The object of the invention is the use defined in the claims. This use is actually a process for gluing textiles in which the copolyamide as defined in the claims is used as a hot melt adhesive. These copolyamides contain the following monomer components: 10-40% by weight caprolactam;
20-60 weight 5-s laurolactam and 20-60
It includes an equimolar mixture of hexamethylene diamine and trimerized fatty acids in weight proportions. These are polycondensed at specific molecular weight ratios.

Preferably the amount of caprolactam is at least 15% by weight, the amount of laurolactam is at least 15% by weight and the amount of said equimolar mixture is at least 30fi
It's quantity. The upper limit is preferably 30M for caprolactam, 5oM for laurolactam and 55% by weight for said equimolar amounts.

The expression "equimolar amounts" is to be understood to mean that the diamine and trimerized fatty acid are present in approximately equimolar amounts. A small degree of one or the other component e.g.
or an excess of up to 2 MRe5 is permissible. Such an excess may function as a chain control agent for molecular weight and therefore viscosity control. However, this excess should preferably not be more than 5 parts by weight based on the total weight of the "equimolar" components.

In the synthesis of the copolyamide, ε-aminocapric acid can be used in place of caprolactam and 12-aminododecanoic acid in place of laurolactam. In each of these cases the same components are included in the copolyamide. The reason is that when these acids are used, water is eliminated during the polycondensation.

As the trimerization acid, the trade name is [Siripol (Prip)].
ol) j 1010, [Pripol J1014, ``Unidigm (YMK from UN) J 14, ``Unidigm''
It is enviable to use a known commercial HM product that can be obtained as 10.

These are synthesized by known methods. Q) E-A 1st
No. 443938, DE-A No. 1443968, DE-
C No. 2118702 and DE-C No. 128[] 8
See No. 52]. These trifunctional fatty acids are polymerized, unsaturated, natural or synthetic fatty acids having 12 to 22 carbon atoms, preferably 18 carbon atoms (tall oil). In addition to trimerization acid (Di), industrial products contain small amounts of used monomer acid (Mo) and trimer acid (Tri). The monomer and trimer acids can be largely removed by distillation and the trimerized fatty acids are obtained practically pure.

These give products with improved color numbers. The dimer acid content is at least 80 gw upwind based on the total weight of industrial "dimeric" fatty acids, which also contain monomers, dimers, and very small amounts of higher polymeric fatty acids. . Desirably the dimer acid content is greater than 90% by weight and preferably (
・′! 95 weight or more. The amount of monomeric fatty acids is desirably no more than 10 M mushroom %, preferably no more than 7 wt%, more preferably no more than 5 wt% and most preferably no more than 1.5 wt%. The amount of trimer acid is desirably less than 100% by weight, preferably less than 15% by weight, and more preferably less than 5% by weight.

Copolyamides are synthesized by known methods. As in the synthesis of 012 polyamide from laurolactam,
The reaction is usually carried out at a temperature of about 280-300°C and preferably about 2
It is carried out at a temperature of 90 DEG to 295 DEG C. and at a pressure of 10 to 50 pars and preferably 15 to 30 pars. Polymerization is continued under these conditions for several hours. The reaction is then continued further by heating to 250-300° C. for several hours, preferably 1-6 hours. Customary catalysts, chain terminators and/or other additions The agents and process conditions known for polyamide polymerization are used. In particular, the reaction is carried out in the absence of air, i.e. in an inert gas atmosphere. In order to achieve a suitable pressure, the It is desirable to add some amount of water to the monomer mixture which evaporates at temperature.

The polycondensation is preferably carried out in m-cresol at 25°C.
The reaction is carried out until the relative solution viscosity ηrel, measured as a weight percent solution, is in the range of about 1.6 to 1.5. Preferably the lower limit of the solution viscosity is about 1.5 and especially about 1.4
It is 5. The upper limit is preferably about 1.6. The melting point desirably ranges from about 80 to 140°C, with a lower limit preferably of about 85°C and an upper limit of preferably about 130°C.
It is ℃. Melting points are determined using a hot plate microscope.

This copolyamide is used in the same application form as known hot melt adhesives.

Approximately 80-200μ for so-called powder point processing
m, their use in the form of fine powders in the particle size range from 0 to 80 μm for dispersions (see DE 2407505) and from 200 to 500 μm for spray applications. preferable. Threads, nets, films, etc. may also be used. The copolyamides may contain conventional additives such as dyes, plasticizers (e.g., U.S. Pat. No. 3,948,844), lubricants, fillers, etc. The lamination is carried out in a known manner, as described in the above-mentioned document as well as German Patent Applications Nos. 2,324,159 and 2.32.
Reference is made to each specification of No. 4,160. This is also the case for fiber material substrates to be pasted. The so-called Rotothθrm method has recently come into use, according to which a molten hot-melt adhesive is applied in a dotted manner to one of the substrates to be glued, where it is allowed to cool. , and then a second base material to be glued is laminated. It is a particular advantage of the copolyamide used in the invention that this hot melt adhesive does not become threadlike and can be applied completely.

As already mentioned, particularly good vapor resistance is achieved with the hot melt adhesive of the invention. This is measured in the following way. The filler material and surface material are laminated. A 5 crn wide and 15 crn long piece is used for the test. The surface material is fixed to the support. The filling material is peeled off a short distance and attached at an angle of 180° to the clamp of an unloaded spring balance. The piece is then sprayed with steam heated to 125-160°C for 10 seconds on both sides. Immediately thereafter, the filler material is separated from the surface material by loading it onto a spring balance. The force used for separation is read on a spring scale and expressed in N15 cm.

Tear strength under normal conditions and tear strength after washing is D-N.
Measured by the 54310 method.

The use of polyamides for gluing textiles is known from British Patent Application No. 45583.

The polyamide is synthesized from a doublet fatty acid, at least one aliphatic unbranched codicarboxylic acid containing 6 to 13 carbon atoms, the ratio of the doublet acid to the cocarboxylic acid based on carboxyl groups being 0. 05:1 to 5:1 and the amount of diamine is equivalent to the acid and caprolactam and laurolactam. The copolyamides used according to the invention differ essentially from these due to the fact that they do not contain codicarboxylic acids containing 6 to 13 carbon atoms. However, unexpectedly improved properties, particularly with respect to steam resistance, are achieved with the copolyamides of the invention.

Example 1 The following raw materials were weighed into a 30 ton autoclave equipped with an agitator.

Hexamethylenediamine 841.9rε-caprolactam 2503.91 Laurolactam 500 '7.9 v Distilled water
300. After purging with nitrogen several times, the autoclave was heated to 290-295 ml within 1 hour.
It was heated to ℃. The pressure rose to 24 par. The precondensation was carried out under these conditions for 2 hours with stirring. The pressure was then reduced to atmospheric pressure over a period of 1.5 hours. Thereafter, the line combination was continued for an additional 1.5 hours at a temperature of 270° C. under a slow nitrogen flow. After this time the polycondensate obtained was spun through a perforated die into a water bath and pelletized. Physical data are given in Table 1.

The pellets were ground into a fine powder in a conventional commercially available cold grinder. After separating the individual particle fractions, 80-20
The 0 μm fraction was applied on a conventional commercially available filler material by a conventional commercially available powder spotting equipment. The coated filler material was ironed with a conventional commercial surface material (55% by weight polyester + 45% by weight cotton) in a conventional ironing press at a pressure of 0.6 bar and a plate temperature of 120°C.

The so laminated textile parts were washed five times at 60° C. using normal commercial detergents.

The separation strength of the untreated sample and the washed sample was measured using D-tech N54.
310. Further steam tests were conducted as described above.

The results are summarized in Table 1.

Example 2 Polycondensed trimerized fatty acids (same as Example 1) 4091. Of'hexamethylene diamine 812.
2f caprolactam 2415.62
laurolactam 4831.2f' stearic acid (chain terminator) 12o,
af The physical data obtained and the test data after laminate formation are also summarized in Table 1.

Comparative examples 1 to 3 The following samples 1-3 were each used for comparison purposes.

(1) Commercial product Platamldo H1
04 This is a copolyamide of 20 parts by weight of caprolactam, 65% by weight of laurolactam and 15 parts by weight of an equimolar mixture of inphorondiamine and adipic acid.

(2) Commercial product Buratamide H105 (DE-C-125
3449 (see Example 3) This contains 40% by weight of caprolactam and 40% by weight of laurolactam.
Weight and hexamethylene diamine and adipic acid (A
H salt) is a 20 wt.% copolyamide.

(3) Commercial product Vestamide T6
50 This is a copolyamide of 25 parts by weight caprolactam, 60 parts by weight laurolactam and 15% by weight of an equimolar mixture of inphorondiamine and toticanedicarboxylic acid.

Comparative experiments have shown that when the copolyamides of the invention are used, comparable values are obtained with respect to conventional tear strength and washing fastness, but that the bond in the steam test is considerably better than that of known commercial products. What you can know is what you can do.

If the copolyamides are used in powder form, these copolyamide powders are dispersed in an aqueous dispersion and such a dispersion is added to the material to be inserted into the textile material parts to be bonded, in particular into fabrics. by drying the textile materials thus coated, sintering them, fixing them and ironing them to the substance to which they are to be bonded, for example by means of a flat iron or an iron press. Heat sealing is sometimes appropriate (see, eg, US Pat. No. 4,030,957). The dispersion usually contains thickeners and stabilizers to produce a stable dispersion. Such thickening agents and stabilizers such as polymeric organic acids, long chain fatty acids and the like are well known to those skilled in the art.

It is practical to make the dispersion slightly alkaline. If such a dispersion is used, it is particularly preferred not to mix the plasticizer with the copolyamide, as mentioned above, and to add the plasticizer as a further component to the dispersion.

The amount of plasticizer is approximately 5% of the total amount of copolyamide and plasticizer.
The amount can be between 0 and 1. Particularly preferred are plasticizer levels up to about 25% by weight, based on the total amount of copolyamide and plasticizer.

It has already been pointed out above that the copolyamides according to the invention may also contain dyes or other customary additives. The copolyamides can thus contain, for example, general antioxidants, flame retardants and, in particular, optical brighteners and fluorescent agents. A wide variety of such agents are known in the art and are available as commercial products. Of course, only additives compatible with the applied heat sealing temperatures can be used (see, for example, US Pat. No. 4,030,957).

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Claims (1)

[Scope of Claims] 1) 10 to 40% by weight of caprolactam, 20 to 60% by weight of laurolactam, and hexamethylene diamine and a dimeric fatty acid (the dimeric fatty acid is a monocarboxylic acid having 12 to 22 carbon atoms). A copolymer consisting of an equimolar mixture of 20 to 60 parts by weight of dimeric fatty acids (containing more than 80 parts by weight of dimeric fatty acids derived from acids, optionally in a mixture with monocarboxylic acids and dimeric carboxylic acids) Method of using polyamide for laminating textile materials. 2) A copolyamide comprising 15-30% by weight of caprolactam, 25-50% by weight of laurolactam and 30-55% by weight of an equimolar mixture of hexamethylene diamine and dimeric fatty acid. Method described. 3) In heat sealing the surfaces of the fibrous materials together,
A small amount of the surface to be sealed (on both sides caprolactam 10 to 40ti%; y chlorlactam 20 to 60% by weight and hexamethylene diamine and a dimeric fatty acid (the dimeric fatty acid is a monomer having 12 to 22 carbon atoms) Dimeric fatty acids derived from carboxylic acids, optionally in a mixture with monocarboxylic acids and dimeric carboxylic acids 80
applying a composition comprising a copolyamide consisting essentially of repeating units of 20 to 60 parts by weight in an equimolar mixture with M k (containing 1 or more); A method comprising heating the polyamide to a temperature sufficient to melt it and allowing the material to cool. 4) Using a copolyamide consisting essentially of repeating units consisting of 15-60% by weight of caprolactam, -50% by weight of laurolaratum and 30-55% by weight of an equimolar mixture of hexamethylene diamine and dimeric fatty acids. A method according to claim 3. 5) The method of claim 6, wherein the composition further includes an aqueous dispersant. 6) The method of claim 5, wherein the composition further includes thickening agents and stabilizers.