FI92495C - Granular detergent compositions containing hectorite clay as a fabric softener - Google Patents

Abstract

Detergent compositions are disclosed which comprise, as a fabric softening ingredient, a fabric softening clay. The fabric softening clay is a hectorite of natural origin, having a layer change distribution such that at least 50% is in the range 0. 23-0. 31 The specified clays have excellent deposition and fabric softening properties.

Description

92495

Granular detergent compositions containing hecto-sufficient clay as fabric softener

The present invention relates to granular detergent-5 compositions comprising a fabric softening amount of hectorite clay, wherein the clay is in the form of particles, wherein the particles have a well-defined layer charge distribution.

GB Patent 1,400,898 discloses detergent compositions containing smectite-type clay as a fabric softener component. Any clay of the smectite type having a cation exchange capacity of at least 50 meq / 100 g is considered suitable. Gelwhite GP and Volclay BC, both sodium montmorillonite clays, are shown to be advantageous due to the copper and cation exchange capacity.

It has now been well found in the detergent industry that the clay types disclosed in GB Patent 1,400,898 have a significant fabric softening property when used in detergents. However, it has just as well been found that the deposition of Tai-like clays on the surface of fabrics is far from complete; in fact, under typical European washing conditions, less than half of the usable clay is deposited on the surfaces of the fabrics and the rest is washed away in the subsequent rinsing steps with the washing liquids. In addition, the softening effect observed as a result of clay deposition is due to factors that are not well understood.

It is therefore an object of the present invention to provide a detergent composition which contains a fabric softening clay, the particles of which are more effectively deposited on the surface of the fabrics during the washing process. Another object of the present invention is to provide detergent compositions in which clay particles are effectively deposited despite the Kay-35 builder system. It is a further object of this invention, 2 92495, to select clay materials for use in detergent compositions that provide significantly better fabric softening properties to detergent compositions than clay materials used in such detergent compositions at the moment.

The present invention relates to detergent compositions containing a fabric softening clay for softening fabrics. Typically, the amount of clay is from 1 to 25% by weight of the detergent composition. The fabric softening clay in question is a hectorite clay derived from a sketch commonly referred to as a trioctahedral smectite. Clay occurs in the form of particles. The particles have a well-defined layer charge distribution, so that at the vå-15 price, 50% of the clay has a layer charge charge of 0.23 -0.31.

The invention relates to a granular detergent composition containing at least 1% of a cleaning surfactant, 5 to 35% of detergent builders and 1 to 25% of hectorite clay of natural origin. The detergent composition is characterized in that the hectorite acid has the general formula

III

Si4.y HSy Oi0 (OH2.2F2)] - («y) (jj + y) Mn + • n where y = 0, or if y f o, Me111 is Al, Fe or B; Mn + is a monovalent (n = 1) or divalent (n = 2) metal ion, for example Na, K, Mg, Ca, Sr, the value of the layer charge distribution (x + y) of the clay being such that at a price of 50 % of the floor charge is in the range of 0.23 to 0.31.

Hectorite clays of natural origin are preferred, with a layer distribution such that at least 65% is in the range of 0.23 to 0.31.

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924 9 S

The layer charge distribution of the clay material can be determined using its swelling in the presence of cationic surfactants with specific chain lengths. This method is described in detail in Lagaly and Weiss, Zeitschrift fiir.

Pflanzenernaherung und Bodenkunde, 130 (1), 1971, pages 9-24.

Recently, an objective method of criticizing fabric softeners has been developed. The method consists of 10 sets of tests known in the detergent industry

Kawabatan as a KES-F system. The method is described in S. Kawabata, "The Standardization and Analysis of Hand Evaluation", 2nd ed., Testile Mach. Soc. Of Japan, Osaka, 1980.

It has been found that one parameter in the KES-F system, namely the shear hysteresis parameter 2HG5, is particularly useful in the characterization of fabric softeners. Preferred here are hectorite clays which, when incorporated into detergent compositions in a concentration of 10% by weight of pi-20, reduce the shear hysteresis of the fabrics in the fabrics washed therein by at least 32%, more preferably at a rate of 35%. The shear hystephesis parameter 2HG5 is described in more detail by Finnimore and Koenig in Melliand Textilberichte 67 (1986) pages 514-516.

. Shear hysteresis on ground rolled cotton terry towels using detergent compositions containing 10% (by weight) of clay to be tested. The experiment is presented in more detail in the following examples.

The hectorite clays used in detergent compositions still typically have a greater tendency to deposit on fabric surfaces. In a standardized test, the deposition of the claimed hectosite clays on the surfaces of the fabrics from the detergent composition is greater than the deposition of conventional detergent clays.

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with smectite-type clays or synthetic siliceous hectares. Examples of suitable hectorite clays include Bentone EW and Macaloid, NL Chemicals, NJ., And hectorites from Industrial Mineral Ventures.

5 Detergent surfactants

The compositions of the present invention typically contain organic surfactants ("surfactants") to achieve the usual cleaning properties associated with the use of such agents.

Suitable cleaning surfactants for use herein include known synthetic anionic, nonionic, amphoteric and zwitterionic surfactants. These typically include alkyl benzene sulfonates, alkyl and alkyl ether sulfonates, paraffin sulfonates, olefin sulfonates, alkoxylated (especially ethoxylated) alcohols and alkylphenols, amine oxides, amine oxides, fatty acids or fatty acid esters. In general, all detergent surfactants contain an alkyl group in the C9.18 region. Anionic detersive surfactants can be used as their sodium, potassium or triethanolammonium salts; the nonionic compounds are usually about 5 to 17 ethylene oxide units. 25 sikkOS. U.S. Patent 3,995,669 contains a detailed list of typical cleansing surfactants. C 1-6 alkylbenzenesulfonates, C 12-18 paraffin sulfonates and alkyl sulfates and ethoxylated alcohols and alkylphenols are particularly preferred in the present type compositions.

. Suitable surfactants for use herein are mytts water-soluble soaps, for example the usual sodium and potassium coconut soaps or tallow soaps well known in the art.

35 The surfactant component may comprise as little as 1% of the composition disclosed herein, but preferably • ·

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92495 5 compositions contain 5 to 40%, preferably 10 to 30% surfactant. Mixtures of ethoxylated nonionic agents with anionic agents such as alkyl benzene sulfonates, alkyl sulfates and paraffin-5-sulfonates are preferred for use in connection with washing to clean a wide variety of dirt and stains from fabrics. However, a particularly high concentration of nonionic surfactants negatively affects the deposition of softening clays. Thus, compositions containing 4% or less of nonionic surfactants are preferred.

Detergent additives

The compositions disclosed in this invention may contain other ingredients to increase their purifying ability. Thus, for example, it is highly preferred that the cleaning detergents contain a detergent builder and / or a metal ion-reactive agent. Suitable detergent builders well known in the art include nitrilotriacetates, polycarboxylates, citrates, carbonates, zeolites, water-soluble phosphates such as tripolyphosphate and sodium ortho- and pyrophosphates, silicates and mixtures thereof. Metal ion reactants include those described above and, in addition, ethylenediaminetetraacetate, aminopolyphosphonates (DEQUEST), and a wide variety of others. 25 polyfunctional organic acids. See U.S. Patent 3,579,454, which provides typical examples of materials to be used for various detergent compositions. Generally, the amount of builder and metal ion reactant is about 0.5 to 45% of the composition. Zeolite (e.g. zeolite A) builders with a particle size of 1 to 10, which are disclosed in DE patent 2,422,655, are particularly preferred for use in compositions containing wax phosphate.

Particularly preferred phosphate-free builders 35 are ether carboxylate mixtures containing 6,92495 a) 1 to 99% of a tartrate monosuccinate compound having the following structure: HOCH - CH - 0 - CH - CH2 5

COOX COOX COOX COOX

wherein X is H or a salt-forming cation; and b) 1 to 99% by weight of tartrate disuccinate compounds having the following structure: CH 2 -CH - O - CH - CH - O - CH - CH 2

COOX COOX COOX COOX COOX COOX

Wherein X is H or a salt-forming cation.

Tanrå-type builder systems are described in more detail in U.S. Patent No. 4,663,071.

Typical detergent compositions contain from 5 to 20% of 35% tata builder.

The detergent compositions disclosed herein preferably contain myOs enzymes to improve their ability to clean various contaminants and stains through their detergent.

Amylase and protease enzymes suitable for use in detergents are well known in the art and are commercially available in liquid and granular detergents. Commercial cleaning enzymes (preferably as a mixture of amylase and protease) are typically used at levels of 0.001 to 2% and above in the present compositions. Detergent. Cellulase enzymes have both cleansing and emollient properties, especially for cotton fibers. These enzymes are highly preferred in the detergent compositions of this invention.

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92495 7 The compositions disclosed herein may contain other ingredients that increase their washing performance. For example, the compositions disclosed herein may advantageously contain a bleaching agent, especially a peroxyacid bleaching agent. In the context of the present invention, the term peroxyacid bleach is used to include both peroxyacids as such and systems that can produce peroxyacids in situ.

Peroxyacids sindnsM contain its alkali and alkaline earth metal salts. Peroxyacids and diperoxyacids are commonly used; examples are diperoxydodecanoic acid (DPDA) or peroxyphthalic acid.

Systems capable of releasing peracids locally contain peroxygen bleach and its activator.

Peroxy bleaches are those capable of obtaining hydrogen peroxide in aqueous solution; These compounds are well known in the art and include hydrogen peroxide, alkali metal peroxides, organic peroxide bleaching agents such as urea peroxide, inorganic persalt bleaching agents such as alkali metal perborates, percarbonates, perphosphates, persilicates and the like.

Preferred are sodium perborate, which is commercially available as mono- and tetrahydrates, sodium t-carbonate peroxyhydrate, sodium pyrophosphate peroxyhydrate and urea peroxyhydrate.

The released hydrogen peroxide reacts with the bleach activator to form a peroxyacid bleach. Classes of bleach activators include esters, imides, imidazoles, oximes, and carbonates. NaissS classes. preferred substances are methyl o-acetoxybenzoates; sodium p-acetoxybenzenesulfonates such as sodium 4-nonanoyloxybenzenesulfonate; sodium 4-octanoyl benzenesulfonate and sodium 4-decanoyloxybenzene 35 enesulfonate; biofenoli-A diacetate; tetraacetyl-92495 8 ethylenediamine; tetra acetyl; tetra acetyl methylene diamine.

Other highly preferred peroxy bleach activators disclosed in U.S. Patents 4,483,778 and 5,439,130, the disclosures of which are incorporated herein by reference, are alpha-substituted alkyl or alkenyl esters such as sodium 4- (2-chlorooctanoyloxy). benzene sulfonate, sodium 4- (3,5,5-trimethylhexanoyloxy) benzenesulfonate. Suitable peroxyacids are 10 myOs peroxy bleach activators as disclosed in published EP patent application No. 0 116 571, compounds of the general type RXAOOH and RXAL, wherein R is a hydrocarbyl group, X is a heteroatom, A is a carbonylsilyl group and L is a leaving group, in particular a leaving group, oxybenzene enesulfonate.

Other highly desirable detergent ingredients suitable for use in the detergent compositions of the present invention include quaternary ammonium compounds of the formula R 4 R 5 R 6 R 7 N * X-, wherein R 4 is alkyl, 20 is about 8 to 20, preferably 12 to 18 carbon atoms, R 5 is alkyl of 1 to 10 carbon atoms and R 6 and R 7 are both C 1-4 alkyl preferably methyl; X 'is an anion, for example chloride. Examples of such quaternary ammonium compounds are C12-14 alkyltrimethylammonium, monium chloride and coconut alkyltrimethylammonium methosulfate. Quaternary ammonium compounds can be used at levels of 0.5 to 5%.

The detergent compositions of the present invention may further contain other emollient ingredients in addition to the clay. Suitable examples are amines of the formula R 1 R 2 R 3 N, where R 3 is C 6-20 hydrocarbyl, R 2 is C 1-20 hydrocarbyl and R 3 is C 1-10 hydrocarbyl or hydrogen. The preferred amine of this type is ditalimethylamine.

Preferably, the emollient amine is a lasna complex with a fatty acid of formula RCOOH, wherein R is C9.20- • · 924959 alkyl or alkenyl. It is desirable for the amine / fatty acid complex to be present as very fine particles with a particle size of 0.1 to 20 micrometers. Such amine / fatty acid complexes are described in more detail in EP-5 Patent Application No. 0 133 804. Compositions containing 1 to 10% of amine are preferred.

Also suitable are the above amine complexes and phosphate esters of the following formula

Rq - P - OH and HO - P - OH

Wherein R 8 and R 15 are C 1-6 alkyl or ethoxylated alkyl of the general formula alkyl- (OCH 2 CH 2) y, wherein the alkyl substituent is CU20r, preferably C8.16 and y is an integer of 1- 15, preferably 2-10, most preferably 2-20. 5. Amine / phosphate ester complexes of this type are described in more detail in EP Patent Application No. 0 168 889.

Other examples of optional emollient ingredients are emollient amides of the general formula R 10 R 11 NCOR 12, wherein R 10 and R X 1 are independently C 1-6 alkyl, alkenyl, hydroxyalkyl, aryl or alkylaryl, R 12 is hydrogen or C 1-6 alkyl or alkyl. a group, an aryl or alkylaryl group, or it is O-R13 / wherein R13 is a ^ -O22-alkyl or alkenyl group or an aryl or alkylaryl group. Preferred examples of such amides are dithiacetamide and ditalibenzamide. Good results are obtained when amides are present in the composition in admixture with a fatty acid or phosphate ester as previously described for emollient amines.

Amides are present in the composition from 1 to 10% by weight.

The amine and amide plasticizers may be added to the mixture and spray dried or may be added as a dry powder to the detergent granules or sprayed onto the surface of the detergent granules or onto the surface of the carrier in either molten or dissolved form. An example of a suitable carrier is perborate monohydrate.

Suitable emollient ingredients include the mydsamines disclosed in U.S. Patent Application GB 2,173,827, especially substituted cyclic amines. Suitable are imidazolines of the general formula 1- (higher alkyl) amido (lower alkyl) -2- (higher alkyl) imidazole-10-sol with alkyl of 12 to 22 carbon atoms and lower alkyl of alkyl of 1 to 4 carbon atoms. Plasticizers of this type are preferably added to the composition in the form of particles or agglomerates, as disclosed in U.S. Patent 4,770,815 15 (EP 265,187).

The preferred cyclic amine is 1-thallamidoethyl-2-thalimidazoline. Preferred compositions contain 1-10% of substituted cyclic amine.

In addition, the compositions disclosed herein contain, in addition to the above ingredients, various other optional ingredients typically used in commercial products to provide aesthetic properties or to enhance the potency of the product. Typical ingredients include pH adjusters, perfumes, dyes, bleaches, optical brighteners, dirt suspending agents, hydrotropic and gel control agents, anti-melt stabilizers, bactericidal agents, preservatives, foaming agents, bleaching agents, bleaching agents, like.

Typically, in the washing step, the compositions are used at a concentration of at least 500 ppm, preferably 0.10 to 1.5%, in aqueous washing at pH 7-11 for fabrics to be washed. Washing can be performed in a lamp room from 5 ° C to the boiling point with excellent results.

II :: 92495 11

Industrial application

The detergent compositions of the present invention are prepared as granules.

There are 5 different methods for incorporating clay into a granular detergent.

For example, savl can be added as a powdered slurry to a mixed mixture of conventional detergent ingredients, mixed and spray dried to form detergent granules.

The clay powder can be myOs agglomerated to the desired agglomerate size and then mixed into granules containing other detergent ingredients. Clay granules suitable for dry mixing can also be obtained by selecting a suitable sieve fraction of natural agglomerates, spraying the clay slurry onto a suitable particulate support, agglomerating the clay particles with sodium carbonate, spray-drying the clay slurry, and the like.

The clay particles may be incorporated into a myds substrate, such as a bag or layer, optionally together with other emollient ingredients. Such substrates can be added to the wash together with conventional wash detergents.

The preferred substrate is a bag containing clay particles and alkylamido-alkyl-2-alkylimidazoline particles of the above type.

Examples I to V

The following granular detergent compositions are prepared: »12 92495

Ingredient Composition _ (% by weight) _

_I II III IV V

C 1-4 alkylbenzenesulfonate (Na) 7.0 5.0 4.0 1.0 6.5

Tallow alcohol sulphate (Na) - 2,0 - - 1,0 A-01efin (C1 'ηQ) -sulphonate (Na) - - 2,0 - 1Z

Tallow alcohol ethoxylate (ED 2) 1.0 2.0 2.0-0.8

Fatty alcohol (O ^ 5) ethoxylate (E07) - 6.0

Hydrogenated tallow fatty acid 2.5 1.0 to 1.0 1.0

Coconut fatty acid - - 1,5 - -

Dodecyltrimethylammonium chloride - 1.0 - 1.0

Distearylmethylamine 3.0 to 3.0 Ditalibenzamide to 4.0

Dodecyldimethylammonium N-oxide 0.5-0.5-0.4

Lauryl-N, N-dimethylamine - - 2,5 - -

Sodium tripolyphosphate 24.0 18 22 32 20 Zeolite 4A to 20.0

Sodium nitrilotriacetate - - - 5.0

Sodium sulphate 12.4 17.7 15.0 21.3 12.7

Sodium carbonate - 8.0 - 5.0

Sodium silicate 6.0 7.0 4.0 6.0 2.0 25 Sodium perborate (4qu.) 20.0 15.0 18.0 10.0 18.0

Carboxymethylcellulose 0.3 0.3 0.5 0.8 0.4

Polyacrylate (mp 10,000 - 20,000) - 1.5 - - -

Polyacrylate (mp 4,000-5,000) - - - - 3.0

Copolymer maleic acid / acrylic acid (70/30) (mp 40,000 - 80,000) 2.0 - 1.5 2.5

Enzymes (protease, amylase, cellulase) 0.6 0.2 0.5 0.5 0.3

Optical brighteners 0.2 0.2 0.3 0.3 0.25

Sulfonated zinc phthalocyanine 30ppm - - 25ppm 25ppm 35 EDTA 0.2 0.2 0.3 0.15 0.2 ll 13 92495

Examples I to V continue

Ingredient Composition _Weight -% _

_I_II III IV V

Ethylenediaminetetramethylenephosphonic acid 0.2 0.1 to 0.1 0.1

Tetraacetylethylenediamine 1.5 - - - 1.5

Isononanoyloxybenzene sulfonate (Na) - 2.0 to 10 Silicone / silica foaming agent 0.2 0.15 0.15 0.25 0.2

Diffuser 0.25 0.25 0.30 0.2 0.25

Hectorite clay 10.0 7.0 15.0 5.0 10.0

Moisture and other low concentrations - equilibrate to 100 - * Bentone EWf highly purified hectorite from Hector CA, available from NL Chemicals, NJ. The clay particles have a rod-like shape and a length to width ratio of 10: 1 20 or greater (TEM dimension).

Layer charge distribution: more than 65% in the range 0.23 - 0.31.

The commercially available material was treated with a humidifier. Suitable is myds of the same substance without a humidifier. So-25 piva is also from Macaloid (NL Chemicals, NJ), myds hectorite • Hector CA.

To the detergent composition of Example I without clay or distearylamine, various smectite clays were added at a level of 10%. The comparison does not contain any 30 smectite clays, but is replaced by 10% Na sulphate.

Each composition was used in the washing experiment as follows: A 3 kg wash load and the desired test fabrics (wood-wool terry towels) * were placed in a commercial automatic drum washing machine (MIELE W 726) using a total wash cycle of 35 to 60 ° C. Detergent compositions were used at a concentration of 1.12% with a water hardness of 0.308 g CaCO 2 / l. Washing load ------— ΤΓ “92495 14 dried with string, 20 ° C / 65% relative humidity. Instrumental softness determinations were performed on the test fabrics of this jaike using the Kawabata KES-F system (shear hysteresis at 5 degrees 2HG5 as a correlation parameter with softness with the KES-F-1 instrument). The size of the sample was 20 x 20 cm, whereby the area of the sample actually subjected to the shear force is 20 x 5 cm. For curves with a shear force as a function of shear angle, the shear hysteresis at 5 ° (2HG5) N / m was calculated. Each of the 10 measurements was repeated 8 times to calculate the confidence limits of the mean at the 95% confidence level.

The hectorite clays of the present invention reduced shear hysteresis by an average of 40%.

*) Supplier: Santens-Belgium (type Lopez, 15 340 g / m2).

The fabrics are washed with the detergent compositions described above in the usual manner. Washed fabrics were evaluated for workability and softness using the Kawabata Evaluation System-Fabric Methods (KES-F; a set of test instruments-20 to measure the parameters that determine the "softness" and "processability" of fabrics). For the purposes of the present invention, the shear hysteria-Silia (2HG5) is of particular importance. Test method for pre-Telia in more detail; Melliand Textilberichte 67 2b (1986) pp. 509-516.

is 92495

Examples VI - X

The following granular detergent compositions are prepared

Ingredient Composition _ (% by weight)

5 VI VII VIII IX X

NaCl-2 linear linear benzene sulfonate - - - 17.6

NaCl-2-linear alkylbenzenesulfonate 14.3 7.1 6.8 20.1 10 NaCl-Al-alcohol sulfate 3.1 7.1 6.8 20.1

NaCl-alkyl polyocyanate 6.5 T 1.0 1.1 1.1 STPP - 28.9 27.7 36.9 40.0

Zeolite 4A 16.5 - -

Silicate 6.8 11.0 10.5 5.7 15.2 15 Carbonate 7.0 - 16.0 14.5

Diethylenetriaminepentaacetic acid - 1.2 1.1 - 1.6

Na-perborate monohydrate - 4.9 5.0

Sodium nonanoylbenzene sulfonate - 6.8 6.8

Enzyme (protease) 0.3 - - - -

Hectorite clay 7.5 6.8 4.7 8.9 9.5 l-thalamidoethyl-2-thalimidazoline - - - 5.7. 25 water, sulphate & others - equilibrated to 100 - * As in Example I - V.

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Claims (10)

1. Granular detergent composition containing at least 1% of a purifying surfactant, 5 - 35% of detergent builder and 1 - 25% of a hector titler clay of natural origin, characterized in that the hectolitre clay has the general formula: [( Mga-xUx) Si4_y H ^, n ° 10 (OHj.zFz)] - <χ + ιΊ tx. + Y) Mnt 10 n where Me111 is Al, Fe or B; or y * 0; Mn * is a monovalent (n = 1) or divalent (n = 2) metal ion, the clay having such a layer charge distribution (x + y) that at least 50% of the layer charge is in the range of 0.23 - 0.31. 2. Granular detergent composition according to claim 1, characterized in that the hectorite clay has such a layer charge distribution (x + y) that at least 65% of the layer charge is in the range of 0.23 to 0.31. Granular detergent composition according to any one of the preceding claims, characterized in that it further contains, as additional plasticizer, 1 to 10% of an amine of the formula R 2 R 2 N, where R x is C 6 - 20 - hydrocarbyl, R 2 or C 2 and R3 is C1.10 hydrocarbyl or hydrogen. Granular detergent composition according to claim 3, characterized in that R 3 and R 2 are both alkyl of 12 to 18 carbon atoms and R 3 is methyl. Granular detergent composition according to claim 4, characterized in that the amine is present as complex with a fatty acid having the formula RCOOH, where R is C 9.20 alkyl or alkenyl. 6. Granular detergent composition according to claim 4, characterized in that the amine is present as a complex with a phosphate ester having the formula: OR OR OR OR g poor R8 and R9 are both C 1-6 alkyl groups or ethoxylated alkyl groups having the general formula alkyl- (OCH Granular detergent composition according to any one of the preceding claims, characterized in that it further contains 1-10% by weight of an amide of the formula R10 RnNCOR12, R10 and R10 independently of each other C1.22 alkyl-, - alkenyl, hydroxyalkyl, aryl or alkylaryl groups; R12 is wet or a C1.22 alkyl or alkenyl, aryl or alkylaryl group or that year 0-R13, whereas R13 is a C1.22 alkyl or alkenyl, aryl or alkylaryl group. 8. Granular detergent composition according to claim 7, characterized in that the amide is present as a composite with a fatty acid as defined in claim 5. Granular detergent composition according to any one of the preceding claims, characterized in that it further contains 1 - 10% of 1- (higher-alkyl) amido (lower-alkyl) -2- (higher-alkyl) imidazoline, low and high. - lower alkyl is alkyl of 12-22 carbon atoms and lower alkyl is 30 alkyl of 1-4 carbon atoms. Granular detergent composition according to any one of the preceding claims, characterized in that it further contains 5 - 35% of a builder system comprising 35 a) 1 - 99% by weight of a tartrate monosuckinate component having a structure. · L! 9 99595 HOCH-CH - O-CH -CH2 COOX COOX COOX COOX 5 bad X years H or a salt-forming cation; and b) 1 - 99% of a tartrate disuccinate component having a structure: CH 2 -CH-O-CH-CH-0-CH-CH 2 in