EP4499918A1

EP4499918A1 - Paper roll as fragrance control release system

Info

Publication number: EP4499918A1
Application number: EP22725392.9A
Authority: EP
Inventors: Alejandro CASTRO MORALES; Amadeo CABRERA; Daniel Flores; John Teffenhart
Original assignee: Symrise AG
Current assignee: Symrise AG
Priority date: 2022-03-30
Filing date: 2022-04-22
Publication date: 2025-02-05
Also published as: US20250314016A1; WO2023186333A1; MX2024011306A; CN118900942A; JP2025512258A

Abstract

The present invention relates to a paper roll, which besides its normal function, has additionally a function as fragrance control release system. Further, the present invention relates to a method for manufacturing said paper roll, as well as to a household product or consumer product, for instance a toilet paper roll, comprising said paper roll.

Description

PAPER ROLL AS FRAGRANCE CONTROL RELEASE SYSTEM

[0001] The present invention relates to a paper roll, which besides its normal function, has additionally a function as fragrance control release system. Further, the present invention relates to a method for manufacturing said paper roll, as well as to a household product or consumer product, for instance a toilet paper roll, comprising said paper roll.

BACKGROUND

[0002] Air fresheners are consumer products that typically emit fragrance and are used in homes or commercial interiors such as restrooms, foyers, hallways, vestibules and other smaller indoor areas, as well as larger areas such as hotel lobbies, auto dealerships, medical facilities, public arenas and other large interior spaces. Different types of air fresheners are available on the market, e.g., liquids, gels, solids in the form of diffusers, reeds, plug-ins, fans, electrical units.

[0003] Of special importance is the suppression of unpleasant odours in bathrooms and toilets. Indeed, as a source of fragrances, specific air fresheners are made for bathrooms and toilets.

[0004] However, commercially available air fresheners, especially those that are made for deodorizing toilets and urinals, contain chemicals that provoke allergy and asthma symptoms or are toxic. Further, commercially available air fresheners introduce fragrance in an uncontrolled manner into the air of interior spaces as droplets with transition to vapor, creating frequently an unpleasant atmosphere for the person who enters the bathroom or toilet shortly after using the air freshener.

[0005] Therefore, there is a need for the development of other alternatives for releasing the fragrance, particularly in bathrooms and toilets.

[0006] One possible alternative are toilet paper rolls, wherein the inner side of toilet paper cardboard roll is impregnated by oil fragrances.

[0007] The disadvantage of these toilet rolls is that the fragrance is constantly released uncontrollably, which leads in most cases to an "overdose" or "saturation" of the fragrance in the atmosphere, which in many cases causes an unpleasant sensation for the toilet or bathroom user. Thus, as with common commercial air fresheners overly strong intense fragrance release is emitted, followed by decreased intensity. From an economic point of view, this alternative is also unsatisfactory, since a much larger quantity of fragrance is released than is necessary to create a pleasant atmosphere. An additional disadvantage is also, that the application of the oil fragrance to the corresponding cardboard ribbon generally via a nozzle causes the generation of a kind of "fragrance-cloud", which does not arrive to the cardboard ribbon. This fact represents not only a high loss of material (oil fragrance), but also a remarkable hygienic problem in the manufactory. On the other hand, the use of oil fragrances for impregnating the cardboard tube is limited, since overdosage may cause of reduction of the cardboard tube material structural integrity.

[0008] The complex object of the present invention was to provide a paper roll, in particular a toilet paper roll which, besides its normal function in a toilet paper roll, has additionally a function as fragrance control release system solving the problems and disadvantages of the toilet paper rolls mentioned above.

DESCRIPTION OF THE INVENTION

[0009] A subject matter of the invention is a suspension consisting of

(a) Microcapsules, having a core material encapsulated within a microcapsule shell, said core material comprises at least one fragrance oil.

(b) A liquid medium, wherein said liquid medium comprises or consists of

(bl ) at least one surfactant,

(b2) at least one fragrance oil,

(b3) at least one deflocculant agent, and

(b4) water, and optionally

(b5) further auxiliaries and/or additives.

[0010] Surprisingly, it was found that a toilet paper roll containing a toilet paper roll impregnated with the suspension according to present invention, allows the controlled release of the encapsulated fragrance, so that a constant fragrance reactivation in the room (bathrooms and toilets) occurs. Thus, a long-lasting effect is achieved, that brings freshness, cleanliness and an enchanting aroma in the interior space. [0011] Further, it was surprisingly found, that the suspension according to present invention shows not only a high storage stability, but also a high stability under the conditions used in the manufacturing-process of the paper roll.

[0012] Further, it was surprisingly found, that the combination of the specific components of the suspension according to present invention reduces remarkably the technical problems observed in the manufacture of paper rolls impregnated by oil fragrances, especially the reduction of the cardboard tube resistance, which may stop the manufacturing process or give a negative effect on toilet paper cardboard, since it may soften or interfere with the cardboard overall structural integrity or adhesive holding carboard tube together.

[0013] Still further, it was surprisingly found, that the combination of the specific components of the suspension with the specific technical conditions of the method for the manufacturing the paper roll described in the present invention avoids the locking of the nozzle used for applying the suspension in the paper.

[0014] For the purposes of the present invention, all percentages are by weight unless specifically indicated otherwise.

[0015] For the purposes of the present invention, a "slurry" in the sense of the invention is nothing other than a particulate core-shell microcapsule suspension in water.

[0016] Preferably, the microcapsules (component (a)) are present in an amount from about 10 % wt. to about 30 % wt., relative to the weight of the suspension. More preferably, the microcapsules (component (a)) are present in an amount of about 12 % wt., relative to the weight of the suspension.

[0017] Preferably, the at least one surfactant (component (b1)) is present in an amount from about 0.5 % wt. to about 1.5 % wt., relative to the weight of the suspension. More preferably, the at least one surfactant (component (b1)) is present in an amount of about 1 % wt., relative to the weight of the suspension.

[0018] Preferably, the at least one fragrance oil (component (b2)) is present in an amount from about 60 % wt. to about 70 % wt., relative to the weight of the suspension. More preferably, the at least one fragrance oil (component (b2)) is present in an amount of about 64 % wt., relative to the weight of the suspension.

[0019] Preferably, the at least one deflocculant agent (component (b3)) is present in an amount from about 0,02 % wt. to about 0,08 % wt., relative to the weight of the suspension. More preferably, the at least one deflocculant agent (component (b3)) is present in an amount of about 0,05 % wt. relative to the weight of the suspension.

[0020] Preferably, water (component (b4)) is present in an amount from about 5 % wt. to 30 % wt., relative to the weight of the suspension. More preferably, water (component (b4)) is present in an amount from about 10 % wt. to 25 % wt., relative to the weight of the suspension.

[0021] Accordingly, in a preferred embodiment, the suspension according to the invention consists of:

(a) Microcapsules, having a core material encapsulated within a microcapsule shell, said core material comprises at least one fragrance oil, in an amount in the range of from about 10 % wt. to about 30 % wt.

(b) a liquid medium, wherein said liquid medium comprises or consists of

(b1) at least one surfactant in an amount in the range of from about 0.5 % wt. to about 1.5 % wt.

(b2) at least one fragrance oil in an amount in the range of from about 60 % wt. to about 70% wt.

(b3) at least one deflocculant agent in an amount in the range of from about 0.02 % wt. to about 0.08% wt., and optionally

(b4) water in an amount in the range of from about 5 % wt. to about 30 % wt., and optionally

(b5) further auxiliaries and/or additives. in each case relative to the total weight of the mixture. with the proviso that the components add up to 100 % wt. together with the optionally further typical auxiliaries and/or additives.

[0022] In a particularly preferred embodiment, the suspension according to the invention consists of:

(a) Microcapsules, having a core material encapsulated within a microcapsule shell, said core material comprises at least one fragrance oil, in an amount of about 12 % wt.

(b) a liquid medium, wherein said liquid medium consists of

(b1) at least one surfactant in an amount of about 1.0 % wt.

(b2) at least one fragrance oil in an amount of about 64 % wt. (b3) at least one deflocculant agent in an amount of about 0.05 % wt., and

(b4) water in an amount from about 10 % wt. to 25 % wt. in each case relative to the total weight of the mixture.

[0023] According to the present invention, fragrance oils are enclosed in a microcapsule and released in a controlled manner. The aroma function is initiated according to a "release-on- demand" principle, i.e., the capsules burst on mechanical contact, releasing the fragrance contained within. As used herein, a "fragrance oil" comprises at least one or more odorous compounds. The term "fragrance oil" is well-known for one skilled in the art, and there is no need to further specification of these substances.

[0024] As used herein, a "core-shell microcapsule, " or more generically a "microcapsule" or "capsule," is a substantially spherical structure having a well-defined core and a well-defined envelope or wall. The "core" is composed of any active material or material submitted to microencapsulation. The "wall" is the structure around the active material core being microencapsulated. In general, the wall of the microcapsule is made of a continuous, polymeric phase with an inner surface and outer surface. The inner surface is in contact with the microcapsule core. The outer surface is in contact with the environment in which the microcapsule resides. Ideally, the wall protects the core against deterioration by oxygen, moisture, light, and effect of other compounds or other factors (e.g. deterioration due to acidic or basic pH values); limits the losses of volatile core materials; and releases the core material under desired conditions. In this respect, the core-shell microcapsules of this invention provide controlled release of the active material.

[0025] As used herein, "controlled release" refers to retention of the active material in the core until a specified triggering condition - in case of the present invention friction - occurs.

[0026] Thus, according to the present invention, when the paper roll is not in use, for instance a toilet paper roll (i.e., when the toilet paper roll does not rotate on its support), the fragrances of the liquid suspension medium are released, creating a pleasant atmosphere in the room. However, each time the toilet paper is used, the cylinder-shaped toilet paper roll rotates on the roll holder, which supports it. Due to the friction, the capsules burst releasing the fragrance contained within. Consequently, each time that the toilet paper is used, a fragrance reactivation in the room (bathrooms and toilets) occurs.

[0027] The encapsulation of active ingredients, for instance of fragrances, is known in the prior art. [0028] The two documents WO 2006 018694 A1 (FIRMENICH) and DE 102008051799 A1 (HENKEL) describe the suspension of perfumed microcapsules in aqueous solutions with mixtures of nonionic and cationic polymers.

[0029] WO 2013 026657 A1 (UNILEVER) describes active substance particles whose outer surface is composed of no-ionic polysaccharides, including hydroxypropyl guar, which is disclosed as a capsule wall component.

[0030] Core-shell capsules with a capsule wall of polycarboxylic acids are known from WO 2014/064255 A2 (GIVAUDAN). Described is stabilization of the capsules during storage in a medium at a specified pH.

[0031] For the purposes of the present invention, capsules are preferred, in which the wall is formed of a polymer such as a urea-formaldehyde polymer, a melamine-formaldehyde polymer, a phenolic-formaldehyde polymer, a urea-glutaraldehyde polymer, a melamineglutaraldehyde polymer, a phenolic-glutaraldehyde polymer, polyurea, polyurethane, polyacrylate, polyamide, polyester, an epoxy cross-linked polymer, a polyfunctional carbodiimide cross-linked polymer, silica, a silica-derived material, polysiloxanes, polyimide, polyvinyl alcohol, polyanhydride, polyolefin, polysulfone, polysaccharide, protein, polylactide (PLA), polyglycolide (PGA), polyorthoester, polyphosphazene, silicone, lipid, modified cellulose, gums, polystyrene, and combinations of these materials. Other suitable polymeric materials are ethylene maleic anhydride copolymer, styrene maleic anhydride copolymer, ethylene vinyl acetate copolymer, and lactide glycolide copolymer. Biopolymers and modified biopolymers are derived from alginate, chitosan, collagen, dextran, maltodextrins and starch can also be used as the encapsulating materials. Additionally, microcapsules can be made via the simple or complex coacervation of maltodextrins. Preferred encapsulating wall polymers include those formed from isocyanates, acrylates, acrylamide, acrylate-co-acrylamide, hydrogel monomers, sol-gel precursors, maltodextrins, melamine-formaldehyde or urea-formaldehyde condensates, as well as similar types of aminoplasts. Said capsules are particularly preferred. Thus, it was observed that the use of said capsules is especially advantageous, since these capsules shows a notable stability under the manufacturing conditions of the paper roll.

[0032] The description of preparation of said capsules can be found in: US 6,586, 107 B2, US 2019/0134592 A1, US 2015/0210965 A1, US 2019/0358603 A1, US 2018/0049957 A1, US 2019/0062676 A1, US 2020/0129385 A1, US 9,631,165 B2, WO 2020/233773 A1, US 2020/0216782 A1, US 2011/0118161 A1, US 2021/0127719 A1, US 2021/0238510 A1, WO 2019/179597 A1, WO 2021/073775 A1, US 2020/0253857 A1 and EP 3 512 626 B1. [0033] Particularly preferred are the use of formaldehyde-free capsules, for example the capsules disclosed in EP 3 512 626 B1.

[0034] In a preferred embodiment, the microcapsules (component(a)) according to the present invention are free of formaldehyde.

[0035] As already mentioned, the core material of the microcapsules comprises at least one fragrance oil. The selection of the fragrance oils to be encapsulated is not critical per se and is determined exclusively by the desired application. The only limiting factor is that these must either be present as oil or be sufficiently oil-soluble, i.e. lipophilic, to dissolve in an oil phase, and the fragrance must not have components that affect the core-shell microcapsule wall chemistry .

[0036] Suitable fragrances are well-known for one skilled in the art, and there is no need to further specification of these substances. However, suitable fragrances are described for example in US 2021/0269739 A1, WO 2015/023961 A1, US 2014/0287008 A1, US 2018/0049957 A1 and W018050248 A1.

[0037] Preferably, the at least surfactant (component (b1)) is or comprises a non-ionic surfactant. Further the surfactants may be low and high HLB (hydrophilic-lipophilic) or mixtures thereof.

[0038] Preferably, the surfactant (component (b1)) is selected from the group consisting of polysorbates and Ethoxylated hydrogenated castor oil esters (commercially available for example under the tradenames Chremophor®, ALPICARE®, EUMULGIN ®, polyoxyl 35) or mixtures thereof. Preferably said polysorbates are selected from the group consisting of polyethylene glycol sorbitan monolaurate (Tween™ 20; Croda Americas, Inc), polyoxyethylene sorbitan monooleate (Tween™ 80; Croda Americas, Inc) or mixtures thereof

[0039] In a preferred embodiment, the surfactant (component (b1)) is selected from the group consisting polysorbate, particularly preferred from the group consisting of polyethylene glycol sorbitan monolaurate (Tween 20), polyoxyethylenesorbitan monooleate (Tween 80) or mixtures thereof.

[0040] In a particular preferred embodiment, the surfactant (component (b1)) is polyoxyethylene sorbitan monooleate (Tween™ 80).

[0041] As mentioned above the liquid medium of the suspension contains also at least one fragrance oil (component (b2)). This/these fragrance oil/s may be the same or different as the fragrance oil of the core material in the microcapsules; therefore, the above explanations apply also to component (b2) of the liquid medium of the suspension.

[0042] As mentioned above the liquid medium of the suspension contains also at least one deflocculant agent (component (b3)). Deflocculants are substances used for preventing the formation of agglomerates. These substances are well-known for one skilled in the art.

[0043] In a preferred embodiment, the at least one deflocculant agent (component (b3)) is selected from the group consisting of humic acids and derivatives, alkaline lignosulfonates, tannin compounds, polyacrylates and acrylic derivatives, acrylate copolymers, cationic acrylamide copolymers polycarbonates, sodium citrate, polysaccharides, sodium and potassium carbonates, sodium and potassium hydroxides, sodium silicates, phosphates and polyphosphates, sodium and ammonium oxalates and mixtures thereof.

[0044] In a preferred embodiment, the at least one deflocculant agent (component (b3)) is selected from the group consisting of polyacrylates and acrylic derivatives, acrylate copolymers, cationic acrylamide copolymers polycarbonates, polysaccharides, tannins, silicates and mixtures thereof.

[0045] In a particular preferred embodiment, the at least one deflocculant agent (component (b3)) is selected from the group consisting of polyacrylamide cationically modified, acrylate copolymers, cationic acrylamide copolymers polycarbonates, polysaccharides, and mixtures thereof.

[0046] In an especially preferred embodiment, the at least one deflocculant agent (component (b3)) is selected polyacrylamide cationically modified (Rheovis CSP @ 2.5% /W; BASF SE 67056 Ludwigshafen, Germany). This compound was particularly efficient avoiding the formation of agglomerates, which could lock the nozzle used for applying the suspension in the paper cardboard.

[0047] In a particular preferred embodiment, the suspension according to the present invention is free of formaldehyde.

[0048] For the purposes of the present invention the further auxiliaries and/or additives may be selected from the group consisting of antidandruff agents, irritation-preventing agents, irritation- inhibiting agents, antioxidants, astringents, antiseptic agents, anti-statics, binders, buffers, carrier materials, chelating agents, cell stimulants, cleansing agents, care agents, softeners, emulsifiers, enzymes, fibres, film-forming agents, fixatives, foam-forming agents, foam stabilizers, substances for preventing foaming, foam boosters, gelling agents, gel- forming agents, hair care agents, hair-setting agents, hair-straightening agents, moisturedonating agents, moisturizing substances, moisture-retaining substances, bleaching agents, strengthening agents, optically brightening agents, gloss agents, polymers, powders, proteins, re-oiling agents, silicones, hair promotion agents, cooling agents, skin-cooling agents, warming agents, skin-warming agents, stabilizers, UV-absorbing agents, UV filters, detergents, thickeners, vitamins, oils, waxes, fats, phospholipids, saturated fatty acids, mono- or polyunsaturated fatty acids, monoohydroxy acids, polyhydroxyfatty acids, liquefiers, dyestuffs, color-protecting agents, pigments, odoriferous substances, polyols, surfactants, electrolytes, organic solvents and silicone derivatives.

[0049] The present invention concerns further to a method for manufacturing the suspension disclosed above comprising or consisting of the following steps:

(a) providing an aqueous solution of the at least one deflocculant agent and optionally the at least one surfactant.

(b) providing a suspension of microcapsules in water.

(c) mixing the aqueous solution of step (a) and the suspension of step (b).

(d1) providing at least one fragrance oil or

(d2) mixing the at least one surfactant with at least one fragrance oil for a period from about 10 to about 20 minutes, wherein the mixture of step (c) is free of surfactant.

(e) combining the at least one fragrance oil of step (d1) or the mixture of step (d2) to the mixture of step (c) and stirring the obtained composition for a period from about 10 to about 30 minutes with a rotary speed in the range from about 400 to about 900 rpm.

[0050] Accordingly, the method for manufacturing the suspension according to the present invention offers two alternatives, each comprising or consisting of the following steps:

1st Alternative (the aqueous solution of step (a) contains surfactant:

Sequence of steps: (a)-(b) -(c)-(d1)-(e)

2nd Alternative (the aqueous solution of step (a) does not contain surfactant:

Sequence of steps: (a)-(b) -(c)-(d2)-(e) [0051] Preferably, step (c) is carried out with a rotary speed in the range from about 200 to about 600 rpm, more preferably with a rotary speed in the range from about 300 to about 500 rpm., and most preferably with a rotary speed in the range of about 350 rpm.

[0052] Preferably, step (c) is performed from about 2 to about 10 minutes, more preferably from about 4 to about 8 minutes, and most preferably for a period of about 5 minutes.

[0053] In a preferably embodiment, step (c) is performed with a rotary speed in the range of about 350 rpm for a period of about 5 minutes, in order to ensure the obtention of a homogenous mixture without damaged microcapsules.

[0054] Preferably, step (d2) is performed for a period from about 15 to about 20 minutes.

[0055] Preferably, step (d2) is carried out with a rotary speed in the range from about 600 to about 900 rpm.

[0056] In a preferred embodiment, step (d) is performed for a period from about 15 to about 20 minutes with a rotary speed in the range from about 600 to about 900 rpm.

[0057] In an even more preferred embodiment, step (c) is performed with a rotary speed in the range of about 350 rpm for a period of about 5 minutes and step (d) is performed for a period from about 15 to about 20 minutes with a rotary speed in the range from about 600 to about 900 rpm.

[0058] Appropriate mixing paddles or blades have been used to carry out the step (e). Said Appropriate mixing paddles or blades are well-known for one skilled in the art, and there is no need to further specification.

[0059] A further subject matter of the present invention is a paper roll comprising the suspension disclosed above.

[0060] In a preferably embodiment, the inner side of the paper roll is impregnated by the suspension disclosed above.

[0061] In a further preferably embodiment, the paper roll comprises an amount from about 0.06 g/roll to 0.12 g/roll of the suspension disclosed above, more preferably an amount of 0.1 gr/roll. This amount ensures function as fragrance control release system and the cardboard tube resistance under the manufacturing conditions of the paper roll.

[0062] In a preferably embodiment, the paper roll is a toilet paper roll.

[0063] The present invention further concerns a method for manufacturing a paper roll disclosed above, comprising or consisting of the following steps: (a) Providing a suspension disclosed above.

(b) Placing the suspension of step (a) onto a tank and subjecting said suspension to be homogenised.

(c) Transfer the homogenized suspension to a pressure vessel, wherein said pressure vessel is connected with a nozzle or spray head by means of a line, which is equipped with a filter.

(d) Adjusting of the air pressure in the pressure vessel to the appropriate flow dosage.

(e) Applying the suspension via a nozzle or spray head to a cardboard ribbon, wherein only a side of said cardboard ribbon is impregnated with the suspension.

(f) Formation of the cylinder-shaped paper roll.

[0064] In a preferably embodiment common process transfer methods such as pump or gravity are used to perform step (b).

[0065] In a preferably embodiment common liquid transfer methods such as pump, gravity or pressure are used to perform step (c). Step (c) can optionally include an additional filtration to eliminate foreign materials.

[0066] Preferably, the air pressure in step (d) is adjusted to about 1 to 5 bar, more preferably adjusted to about 1.5 to bar, and most preferably to about 2.0 bar.

[0067] Preferably, the filter constructed using metal or inert plastic of the line is selected form the group consisting of Filter 45-Mesh, Filter 50-Mesh, Filter 60-Mesh, Filter 70-Mesh, Filter 100-Mesh and Filter 120-Mesh, more preferably selected form the group consisting of Filter 60-Mesh, Filter 70-Mesh and Filter 100-Mesh. Most preferably the filter of the line is Filter 70- Mesh.

[0068] In preferred embodiments, the diameter of the nozzle in steps (c) and (e) is 0.3-0.6 mm, more preferably 0.5 mm.

[0069] The nozzle in step (e) may contain specific elements within to produce desired spray ribbon pattern.

[0070] In an even more preferred embodiment, the air pressure in step (d) is adjusted to about 2.0 bar (to get an appropriate flow dosage), filter of the line is Filter 70-Mesh and the diameter of the nozzle is 0.5 mm.

[0071] Surprisingly, it has been found that the specific combination of the parameters air pressure, filter and diameter of the nozzle, besides of course the composition of the suspension, is not only crucial for avoiding the lock of the nozzle when for applying the suspension in the paper cardboard, but also for avoiding the generation of the already commented "fragrance-cloud", which leads to serious economical (loss of material) and hygienical problems.

[0072] Still further, the method of the present invention ensure also that the suspension is homogeneous applied in the paper roll, which allows a maximal efficiency deodorizing bathrooms and toilets.

[0073] The present invention concerns further to the use of the paper roll mentioned above as fragrance control release system.

[0074] Still further, the present invention concerns to a household product or consumer product comprising the paper roll mentioned above.

[0075] In a preferred embodiment said household product or consumer product is selected from the group consisting of toilet paper roll, kitchen towels, pre-moistened wipes.

[0076] In a particularly preferred embodiment said household product or consumer product is a toilet paper roll.

EXAMPLES

[0077] The following examples further illustrate the invention but are not to be construed as limiting its scope.

[0078] The performance as fragrance release system of a toilet paper roll according to present invention (= TPR) has been evaluated in comparison to a toilet paper roll (= CTPR) characterized in that the inner side of toilet paper cardboard roll is impregnated by oil fragrance, which is the result of the mixture of several free oil fragrances.

In this case, the free oil fragrance of the microcapsules (component (a)) and the free oil fragrance of the liquid medium (component (b)) in TPR are different.

The composition regarding the oil fragrances of TPR and CTPR are identical. The same applies to the amount of paper contained in TPR and CTPR.

The inner side of toilet paper cardboard roll of TPR was impregnated with a suspension according to the present the present invention (0.1 g/roll). TPR was packed into a hermetic plastic bag and kept to 25°C during 3 to 7 days for maceration.

The inner side of toilet paper cardboard roll of CTPR was also impregnated with the oil fragrance (0.1 g/roll). CTPR was packed into a hermetic plastic bag and kept to 25°C during 3 to 7 days for maceration.

The performance was evaluated regarding the hedonic and sensorial properties under controlled condition of temperature into a cabin under controlled conditions (at 25 and 40 °C) for a week.

The evaluation was carried out by a plurality of testers (6 experts) by smelling the environment in the cabin and in comparison, with one another.

TPR and CTPR were placed in the cabin, as illustrated in figure 1.

After placing TPR and CTPR into the roll holder and wait for 10 minutes in the cabin, the environment in the cabin was evaluated (= Measure 1).

TPR- and CTPR -uses were then carried out, in each of which exactly the same amount of paper was taken (14 uses were evaluated, 2 uses /day, both uses in a time interval of 6 hours).

Table 1 summarizes the result after evaluation:

- Table 1 -

EVALUATION SCALE:

5 very strong

4 strong

3 neither strong or weak

2 weak

1 very weak

The data in table 1 show that prior to the use (Measure 1), the intensity of the fragrance in the case of CPTR is slightly more intense than that of TPR, both at 25 °C and 40 °C.

However, once the roll of paper is in use, the opposite is observed. The intensity of fragrance determined in PCR is clearly higher than the intensity in the case of CPCR.

Indeed, it can be observed, that as the number of uses of the paper roll increase, the improvement in efficiency of the paper roll according to the present invention as compared to CPCR also increases (compare data of Measure 7 with data of Measure 14).

Claims

CLAIMS Suspension consisting of (a) Microcapsules, having a core material encapsulated within a microcapsule shell, said core material comprises at least one fragrance oil. (b) A liquid medium, wherein said liquid medium comprises or consists of

(b1) at least one surfactant,

(b2) at least one oil fragrance oil,

(b3) at least one deflocculant agent, and

(b4) water, and optionally

(b5) further auxiliaries and/or additives. Suspension according to claim 1, wherein the microcapsules (component (a)) are present in an amount of from about 10 % wt. to about 25 % wt., relative to the weight of the suspension. Suspension according to any one of the preceding claims, wherein the at least one surfactant (component (b1)) is present in an amount of from about 0.5 % wt. to about 1.5 % wt., relative to the weight of the suspension. Suspension according to any one of the preceding claims, wherein the at least one fragrance oil (component (b2)) is present in an amount of from about 60 % wt. to about 70 % wt., relative to the weight of the suspension. Suspension according to any one of the preceding claims, wherein the at least one deflocculant agent (component (b3)) is present in an amount of from about 0,02 % wt. to about 0,08 % wt., relative to the weight of the suspension. Suspension according to any one of the preceding claims, wherein the surfactant (component (b1)) comprises a non-ionic surfactant. Suspension according to any one of the preceding claims, wherein the at least one deflocculant agent (component (b3)) is selected from the group consisting of humic acids and derivatives, alkaline lignosulfonates, tannin compounds, polyacrylates and acrylic derivatives, acrylate copolymers, cationic acrylamide copolymers polycarbonates, sodium citrate, polysaccharides, sodium and potassium carbonates, sodium and potassium hydroxides, sodium silicates, phosphates and polyphosphates, sodium and ammonium oxalates and mixtures thereof. Suspension according to any one of the preceding claims, wherein said suspension is free of formaldehyde. Method for manufacturing the suspension according to any one of the preceding claims 1 to 8 comprising or consisting of the following steps:

() providing an aqueous solution of the at least one deflocculant agent and optionally the at least one surfactant.

(b) providing a suspension of microcapsules in water.

(c) mixing the aqueous solution of step (a) and the suspension of step (b).

(d1) providing at least one fragrance oil or

(d2) mixing the at least one surfactant, with at least one fragrance oil for a period from about 10 to about 20 minutes, wherein the mixture of step (c) is free of surfactant.

(e) combining the at least one fragrance oil of step (d1) or the mixture of step (d2) to the mixture of step (c) and stirring the obtained composition for a period from about 10 to about 30 minutes with a rotary speed in the range from about 400 to about 900 rpm. A paper roll comprising the suspension according to claims 1 to 8. A paper roll according to claim 10, wherein the inner side of the roll is impregnated by the suspension according to any one of claims 1 to 8. Method for manufacturing a paper roll according to any one of claims 10 to 11 comprising or consisting of the following steps:

(a) providing a suspension according to any one of the preceding claims 1 to 8.

(c) transferring the homogenized suspension to a pressure vessel, wherein said pressure vessel is connected with a nozzle by means of a line, which is equipped with a filter. (d) adjusting of the air pressure in the pressure vessel.

(e) applying the suspension via a nozzle to a cardboard ribbon, wherein only a side of said cardboard ribbon is impregnated with the suspension.

(f) formation of the cylinder-shaped toilet paper cardboard roll. Method according to claim 12, wherein the filter of the line is selected form the group consisting of Filter 45-Mesh, Filter 50-Mesh, Filter 60-Mesh, Filter 70-Mesh, Filter 100- Mesh and Filter 120-Mesh. Use of a paper roll according to any one of the preceding claims 10 to 11 as fragrance control release system. A household product or consumer product comprising the paper roll according to any one of the preceding claims 10 to 11.

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