T 0500/05 (Emollient oil containing soap bar/UNILEVER) 03-11-2006

1. Articles 84, 123(2) and 54 EPC

The Board is satisfied that the claimed subject-matter complies with the requirements of Article 84 and 123(2) EPC and that the claimed subject-matter is novel over the cited prior art.

Since the appeal fails on other grounds no details are necessary.

2. Inventive step

2.1 Claim 1 relates to a process for producing a soap bar comprising an emollient oil as benefiting agent (page 1, lines 3 to 5 in combination with page 5, line 15).

As explained in the present application, the attempt of incorporating into soap bars additives capable of modifying the interaction of the product with the skin, such as emollient oils, had been accompanied with several drawbacks; for example, the soap mass became sticky and difficult to process, the obtained product had a sticky feel and a careful control of the oil droplet size with resulting reduced throughput was necessary. Therefore, a modification of the fat charge had been also rendered necessary in order to overcome some of the drawbacks mentioned above (see page 1, line 12 to 16 and page 1, line 33 to page 2, line 25).

The technical problem underlying the claimed invention is reported thus in the present application as the provision of a process for making soap bars which can deliver sensory benefits and overcomes the problems mentioned above, so that an emollient oil can be incorporated in a robust way into a soap bar with a minimized need for modification of existing manufacturing processes (see page 2, line 31 to page 3, line 22).

2.2 Both the Examining Division and the Appellants found that document (1) was the most suitable starting point for assessing the inventiveness of the claimed subject-matter.

The Board has no reason for departing from this finding.

Document (1) discloses a process for the preparation of a toilet soap bar comprising a silicone benefiting agent and which can comprise up to 90% by weight of soap, wherein an emollient oil, consisting of a blend of silicone gum and silicone fluid, i.e. a water-free water-immiscible emollient oil, is pre-mixed with a melted Carbowax 8000 (PEG-150) carrier, which is a water-soluble carrier solid at ambient temperature and at elevated temperatures of up to about 60ºC; the mixture is cooled to form particles of the emollient oil within a matrix of the carrier, formed into flakes and added to the amalgamator containing the soap mixture; the amalgamated mixture is thereafter milled, plodded and stamped into bars. The silicone blend particles are released from the product during use (see page 5, lines 16 to 21; page 6, lines 14 to 23; page 9, lines 3 to 5 and lines 14 to 19; page 12, lines 8 to 13; page 20, lines 11 to 15, 25 to 27; page 20, line 34 to page 21, line 10; example VIII in combination with page 26, line 21 to 30 and page 27, lines 2 to 14).

The Board thus finds that the soap bar obtained in the process disclosed in document (1) contains necessarily homogenously distributed particles of the silicone oil entrapped within the carrier, which particles thus are present as a fixed constant domain size throughout the process.

The only difference between the claimed process and that disclosed in document (1) thus consists in the pre-mixing of the emollient oil with a solid water-soluble carrier which remains solid also under process conditions. In fact, document (1) suggests explicitly to melt the carrier before pre-mixing it with the emollient oil and to solidify thereafter the obtained mixture.

2.3 The toilet bars prepared in document (1) have improved durable skin feel, skin conditioning, rinsing, mildness and excellent lather performance without negative tactile attributes such as greasy, sticky, tacky or taut skin feel (see page 2, lines 7 to 15 in combination with page 3, lines 30 to 34 and page 4, line 33 to page 5, line 5). Moreover, they can be prepared by conventional techniques including crutching, drying, amalgamating, milling, plodding and stamping (page 20, lines 11 to 15).

Therefore, the Board finds that, because of the high quality of the product obtained by means of the process of document (1), the soap mass used in that document did not become sticky and difficult to process and the obtained product had not a sticky feel.

As the silicone benefiting agent was present in the form of particles within a matrix of the carrier, there was also no need of a careful control of the oil droplet size with resulting reduced throughput. Furthermore, there was no need for modification of the fat charge.

The process disclosed in document (1) had thus already dealt with and solved the same technical problem addressed to in the present application of providing a process for making soap bars which can deliver sensory benefits and able of incorporating in a robust way a benefit agent such as an emollient oil with a minimized need for modification of existing manufacturing processes.

2.4 In the light of the teaching of document (1), the technical problem underlying the claimed invention has thus to be formulated as the provision of an alternative process of the same type of that of document (1) capable of providing toilet bars having similar characteristics.

2.5 The Board notes that document (1) did not require, as an essential step of the process for forming soap bars, that the carrier is liquid or liquefied before being pre-mixed with the silicone component or that the pre-mixing is carried out at elevated temperature or in a specific mixer suitable for mixing only liquid components.

Therefore, the skilled person could have selected for the pre-mixing step any suitable alternative mixing step which he would have considered apt to obtain particles of the emollient oil within a matrix of the carrier (see page 20, lines 25 to 26 in combination with page 21, lines 3 to 8).

Even though document (1) suggested also the alternative use of water-insoluble carriers, some of them being also liquid at ambient temperature, the most preferred one was the Carbowax 8000 used in the examples (see page 20, lines 27 to page 21, line 3). Therefore, there was no reason for the skilled person, looking for a modification of the process explicitly disclosed in document (1), to select less preferred carriers which, moreover, could have been liquid at ambient temperature and thus no apt to form a mixture containing particles of the silicone benefiting agent within a matrix of the carrier.

Since, as found in the appealed decision (point 6.1 of the reasons for the decision) and not contested by the Appellants, the technique of soft-solid mixing steps was known to the skilled person at the priority date of the present application, it was obvious for the skilled person, looking for an alternative way of forming a mixture of silicone benefiting agent and Carbowax 8000, to try to mix them in an appropriate soft-solid mixer at a temperature lower than that used in the example of document (1), e.g. one in which the Carbowax 8000 was still in the solid state.

2.6 The Board thus concludes that it was obvious for the skilled person, in the light of the teaching of document (1), to try, alternatively, to use the carrier as a solid in the pre-mixing step with the expectation of obtaining a toilet soap bar having similar properties.

Therefore, the subject-matter of claim 1 lacks an inventive step.

2.7 Since the appeal fails on these grounds there is no need to discuss the dependent claims.