JP3289899B2 - Washing rinse and desiccant sheet - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to laundry rinses and dryer sheets comprising N, N-dihydrogenated tallow-N, N-dimethylammonium chloride and amine oxide.

BACKGROUND ART When fabrics are washed, they are not only softened by treating them with a fabric softener, but also bulkier and easier to iron, so that the drying time of the fabrics can be reduced. It is often desirable to shorten and reduce the static charge. Commonly used fabric softeners are N, N-dihydrogenated tallow-N, N-dimethylammonium chloride (DTM) which is inexpensive and effective as a softener.
AC), which on the other hand has certain disadvantages, such as yellowing of the fabric, reducing the washability of the softened fabric, having no effect on the antistatic effect on the polyester, and the re-leakage of the treated fabric Has the disadvantage of reducing

Amine oxides, such as N-alkyl-N, N-dimethylamine oxide, are also effective fabric softeners, and are sometimes more advantageous than DTMAC in the above respects. This is D
It did not improve the results obtained with DTMAC alone when used with TMAC, or gave intermediate results to those obtained with either component of the fabric softener alone.

BRIEF DESCRIPTION OF THE INVENTION The use of N-alkyl-N, N-dimethylamine oxide with N, N-dihydrogenated tallow-N, N-dimethylammonium chloride has now been described in the context of fabric softener products.
(1) N, N-dihydrogenated tallow-N, N
-Dimethylammonium chloride 25-80% by weight and N
-Octadecyl-N, N-dimethylamine oxide 75-2
A laundry rinse comprising an aqueous solution of 0% by weight of the mixture,
Or (2) 10 to 80% by weight of N, N-dihydrogenated tallow-N, N-dimethylammonium chloride and N-alkyl-N,
A laundry dryer sheet comprising a soft adsorbent substrate impregnated with a fabric softener, which is a mixture of 90-20% by weight of N-dimethylamine oxide;
However, the alkyl group is an amine oxide in the mixture of 20 to
It has been discovered that when 40% is octadecyl and otherwise is a primary alkyl group of 8 to 24 carbon atoms, it can provide an improved fabric softener product.

DETAILED DESCRIPTION As already mentioned, the quaternary ammonium chloride component of the fabric softener mixture is a known N, N-dihydrogenated tallow-N, N-dimethylammonium chloride (DTMA).
C). DTMAC used to make the mixture is generally the most commonly available substance, ie, 75% in alcohol.
Paste.

The amine oxide component of the mixture is N-octadecyl-N, N-dimethylamine oxide or other N-alkyl-N, N-dimethylamine oxide. Here, the alkyl is a primary alkyl group having 8 to 24 carbon atoms, preferably 12 to 18 carbon atoms. Primary alkyl groups can be straight or branched, but preferred oxides are those in which at least most of the primary alkyl groups in the molecule are straight. Examples of these oxides are N-octyl-, N-decyl-, N-dodecyl-, N-tetradecyl-, N-hexadecyl-, N-octadecyl-, N-eicosyl-, N-
-Docosyl- and N-tetracosyl-N, N-dimethylamine oxide.

The amine oxides used in the preparation of the products of the present invention may be conventional aqueous or solid amine oxides, such as the amine oxide dihydrates described in European Patent Application No. 0401503 and British Patent Application No. 2240791. However, when the mixture is used as an aqueous solution, it is preferred to use the amine oxide in solution form, or else to use a solid amine oxide.

Except for the fabric softener mixture used, the laundry rinse of the present invention has water as a major component (typically 70-90% by weight of water) and any of the other ingredients typically used in laundry rinses. Or it may contain, for example, small amounts of substances such as dyes and fragrances, and sometimes alcohols such as ethanol to prevent phase separation, as well as conventional rinses containing novel textile softener mixtures. Furthermore, rinses are made and can be made as such rinses, except that the novel mixture is used as a fabric softener. In addition, a normal technique is suitable for rinsing the laundry using this.

All of the laundry rinses of the present invention contain only one component of the fabric softener mixture, regardless of the specific proportions of DTMAC and N-octadecyl-N, N-dimethylamine oxide within a particular range. It has the advantage over laundry rinses of providing good rewetability to washed fabrics, such as cotton. However, optimal rewetting is obtained when the fabric softener is a mixture of about 75% by weight quaternary ammonium chloride and about 25% by weight amine oxide. The advantage of this mixture is that N-octadecyl-N, N-
This is unexpected when an amine oxide such as N-octyl-N, N-dimethylamine oxide is used instead of dimethylamine oxide, since such a synergistic effect is not observed.

The laundry desiccant sheets of the present invention are prepared by dipping an absorbent flexible substrate in an aqueous mixture of a fabric softener mixture and compressing the resulting impregnated sheet to remove excess surfactant, which is then removed. It can be manufactured by a usual method of drying. However, it is also preferably prepared by coating an absorbent flexible substrate with a molten mixture of the fabric softener component and then solidifying the mixture.

If the laundry desiccant sheet is made from a melted fabric softener mixture, this step involves immersing the absorbent soft substrate in the melt mixture of the fabric softener component, thus coating, and inherently The surface active agent is impregnated with the surfactant, and the impregnated sheet is subjected to 2
It is convenient to do so by removing excess surfactant through two rolls and solidifying the remaining surfactant.

The absorbent flexible substrate used to make the desiccant sheet can be any of the substrates typically used to make desiccant sheets. This is because the only requirement for the substrate is that it be a sheet-shaped absorbent material. For example, it can be sponge, paper or woven or non-woven, especially wool, silk, jute, hemp, cotton, linen,
Nonwoven fabrics made from sisal, ramie, rayon, cellulose ester, vinyl polymer, polyamide, and polyester fibers or filaments. A particularly desirable substrate is a sheet of non-woven polyethylene terephthalate fabric.

All of the laundry desiccant sheets of the present invention in which the fabric softener is a mixture of 50-80% by weight of DTMAC and 50-20% by weight of N-octadecyl-N, N-dimethylamine oxide, use either component of the mixture alone. Has the advantage that it can impart greater flexibility to the washed fabric than is achieved when used as a fabric softener. However, optimal results are achieved when the fabric softener is a mixture of about 75% by weight DTMAC and about 25% by weight amine oxide.

The fabric softening agent is 10 to 60% by weight of DTMAC and N-
Any one of alkyl-N, N-dimethylamine oxide 9
The laundry desiccant sheet, which is a mixture of 0-40% by weight, is said to reduce the formation of static charge when used in a drying process on a washed polyester fabric or a laundry batch containing at least some polyester fibers. Has advantages.
In this case the best result is that the fabric softener is about 50% by weight DTMAC
And about 50% by weight of amine oxide.

The following examples illustrate, but do not limit, the invention. Unless stated otherwise, the amounts mentioned in the examples are by weight.

Example 1 Five intermediate cotton terry towels were subjected to four wash / rinse / wash cycles. At this time, rinse with N-octadecyl-N, N-dimethylamine oxide (AO-1
8) and / or an aqueous solution of N, N-dihydrogenated tallow-N, N-dimethylammonium chloride (DTMAC) was used. The treated towel was then tested for rewetability according to CSMA test method D-13D. That is, the towel measures 12.7 × 1
Cut into 5.2 cm strips, mark each strip 1 cm from the narrow end, hang it in a 0.01% Rhodamine B dye bath for 6 minutes, and at the end of that time the distance traveled by the dye Was recorded in cm. AO-18 and DTMA used as fabric softener
The amount of C and the results of the rewetability test are shown in the table below.

Example 2 Fifty cotton hand towels were washed with an anionic laundry detergent 37.5
g for 30 minutes under medium load in the presence of g, divided into 5 groups of 10 towels, each group placed in an automatic dryer and a softener comprising AO-18 and / or DTMAC 1g
At about 65 ° C in the presence of a loaded polyester desiccant sheet
Dried for 60 minutes or “normal”. The softness of the dried towels was then rated by a panel of evaluators, rated on a scale of 5 (maximum flexibility) to 1 (minimum flexibility). The amounts of AO-18 and DTMAC used in the fabric softener and the results of the flexibility test are shown in the table below.

Example 3 23% polyester fiber, 46 cotton / polyester fibers
%, And 31% cotton fiber, were washed at medium load for 30 minutes in the presence of anionic laundry detergent, and then divided into five identical quasi-batches. Place each quasi-batch in an automatic dryer and add AO-18 and / or DTMAC fabric softener for 1
The g-loaded polyester desiccant sheet was placed on top of the semi-batch into each automatic dryer and then the semi-batch was dried "normal" at about 65 ° C for 60 minutes. The antistatic activity of the fabric softener on each desiccant sheet was then determined according to CSMA test method D-13D by removing each piece of washed fabric separately from the dryer, dropping it into a Faraday cage, and Was determined by recording the potential. In this case, each test was carried out in one day when the relative humidity was 22% and 50%.

The amounts of AO-18 and DTMAC used in the fabric softener and the results of the antistatic test are shown in the table below.

──────────────────────────────────────────────────の Continued on the front page (31) Priority claim number 652,619 (32) Priority date February 8, 1991 (1991.2.8) (33) Priority claim country United States (US) (72) Inventor Borland, J. Aims E. 70815 Batton-Rougeille East Millburn, Louisiana, United States of America 12253 (72) Inventor Sauer, Gioux Day 70816, Batton-Rougeille-Wayoutdoor Avenue, Louisiana, United States of America 15553 (72) Inventor Perrin, Jeffrey Davryou United States Louisiana 70810 Bat Nrujiyu path Chi Your Biyu drive 1152 (56) reference Patent flat 2-6662 (JP, a) United States Patent 3959157 (US, a) (58 ) investigated the field (Int.Cl. ^7, (DB name) D06M 13/00-13/535

Claims (15)

(57) [Claims] An amino acid-free fabric containing only N, N-dihydrogenated tallow-N, N-dimethylammonium chloride and N-alkyl-N, N-dimethylamine oxide as active ingredients of a fabric softener. A softener product, wherein the fabric softener product is N, N-dihydrogenated tallow.
25,80% by weight of N, N-dimethylammonium chloride and N-octadecyl-N, N-dimethylamine oxide 7
A fabric softener product, characterized in that it is a laundry rinse comprising an aqueous solution of 5 to 20% by weight of the mixture. 2. The fabric softener product of claim 1 which is a laundry rinse that provides improved rewetting of the washed fabric. 3. The fabric softener product of claim 1, wherein the fabric softener further comprises one or more dyes, fragrances and / or alcohols. 4. The fabric softening agent is N, N-dihydrogenated tallow-N, N
-75% by weight of dimethyl ammonium chloride and 25% by weight of N-octadecyl-N, N-dimethylamine oxide
4. The fabric softener product of claims 2 or 3 which is a mixture of: 5. A method of providing a softened washed fabric having improved rewetting properties, comprising rinsing the washed fabric with the laundry rinse of claim 1. 6. The method of claim 5 wherein the fabric is cotton and the fabric softener of the laundry rinse is a mixture of 75% by weight substituted ammonium chloride and 25% by weight amine oxide. 7. An amino acid-free fabric containing only N, N-dihydrogenated tallow-N, N-dimethylammonium chloride and N-alkyl-N, N-dimethylamine oxide as active ingredients of a fabric softener. A softener product, wherein the fabric softener product is N, N-dihydrogenated tallow.
10 to 80% by weight of N, N-dimethylammonium chloride and N-octadecyl-N, N-dimethylamine oxide 9
A fabric softener product characterized by being a laundry desiccant sheet comprising a soft adsorbent substrate impregnated with a fabric softener which is a mixture of 0 to 20% by weight. 8. Impregnated with 50 to 80% by weight of N, N-dihydrogenated tallow-N, N-dimethylammonium chloride and 50 to 20% by weight of N-octadecyl-N, N-dimethylamine oxide as a fabric softening agent. 8. The fabric softener product of claim 7 which is a laundry desiccant sheet comprising a softened adsorbent substrate. 9. N, N-dihydrogenated tallow-N, N-dimethylammonium chloride 75% by weight and N-octadecyl-N,
9. The fabric softener product of claim 8, which is a laundry desiccant sheet comprising a soft adsorbent substrate impregnated with 25% by weight of N-dimethylamine oxide as a fabric softener. 10. Fabric softening which is a mixture of 10-60% by weight of N, N-dihydrogenated tallow-N, N-dimethylammonium chloride and 90-40% by weight of N-octadecyl-N, N-dimethylamine oxide. 8. The fabric softener product of claim 7 which is a laundry desiccant sheet comprising a soft adsorbent substrate impregnated with an agent. 11. The fabric softener product of claim 10 wherein the fabric softener is a mixture of 50% by weight substituted ammonium chloride and 50% by weight amine oxide. 12. A method for improving the flexibility of a washed fabric, wherein the washed fabric is dried in an automatic dryer containing the laundry desiccant sheet according to claim 8. 13. The fabric as claimed in claim 12, wherein the fabric is cotton and the fabric softener in the desiccant sheet is a mixture of 75% by weight of substituted ammonium chloride and 25% by weight of amine oxide.
the method of. 14. A laundry batch comprising at least some polyester fabric comprising drying the laundry batch in an automatic dryer containing the laundry desiccant sheet of claim 10 or 11. To reduce static charge formation in 15. The method of claim 14 wherein the laundry batch consists entirely of a polyester fabric.