T 2219/16 (Hose-Plasticizer/FITT) 14-07-2020

The board is in a position to issue a written decision without holding oral proceedings because the appellant withdrew its request for holding oral proceedings and, as requested by the respondents, the appeal is dismissed.

1. Auxiliary request 4 - Article 83 EPC

The board has concluded that the invention defined in claim 1 of this request does not comply with the requirements of Article 83 EPC.

1.1 For the invention to be sufficiently disclosed, the information in the patent should enable the skilled person to reproduce a garden hose with an inner layer comprising PVC and 20%-100% of a non-phthalate plasticizer which fulfills the following two conditions:

i) "a migration level of 0 measured according to ASTM D 3291 as to maintain said mechanical flexibility of said second polymer material substantially unaltered with time."; and

ii) "a cold flexibility (Tf) of less than -5°C as measured according to ASTM D 1043"

1.1.1 Claim 4 as granted defines a list of suitable non-phthalate plasticizers. Nonetheless, according to the information in the patent in suit (figure 3 and par. [0029]-[0038]), the use of these suggested plasticizers does not guarantee that the above conditions i) and ii) are fulfilled. In particular, none of the tested plasticizers shows a migration rate of 0, the best ones being DINCH® and the monomeric or polymeric adipate based plasticizers, which have a migration rate of 1.

1.1.2 The only example actually fulfilling the above conditions i) and ii) is "Samp 8" in the tests described in paragraph [0038] of the patent in suit, which sample consists of a 10%/90% mixture of monomeric/polymeric forms of not further specified "adipate plasticizers". It should however be noted that the term "adipate" encompasses a wide variety of salts and esters of adipic acid. As argued by respondent 4, the patent fails to indicate the specific adipate(s) used in this sample as well as the concentration of this plasticizer in the polymer (in par. [0038] it is merely indicated that all the samples use the same plasticizer concentration).

1.1.3 Furthermore, according to paragraph [0030] of the patent in suit, monomeric or polymeric adipate plasticizers have a migration rate of 1 (not zero, as required in claim 1), which implies that the use of mixtures of monomeric and polymeric adipates does not necessarily lead to a hose fulfilling the above condition i). Consequently, the board considers that the only example in the patent satisfying the conditions defined in claim 1 (i.e. "Samp 8") is itself insufficiently disclosed.

1.2 The appellant argued that plasticizers were chosen in everyday practice on the basis of technical datasheets which were readily available from chemical companies. A person skilled in the art would thus simply have to search through these datasheets to find a plasticizer providing the desired cold flexibility and low migration characteristics as defined in claim 1. The invention could therefore be carried out without undue burden.

1.2.1 The board does not agree with these arguments for the following reasons:

- While some plasticizer datasheets might provide data indicative of the levels of migration and cold flexibility which can be expected, this can only be used to make a pre-selection. The actual migration and cold flexibility values for a given polymer must be tested for each specific film (to be used in the garden hose) with the (pre-selected) plasticizer/s. Thus, the information in the datasheets would not obviate the need for extensive testing.

- The skilled person would not only need to find and test the required type of plasticizer/s, but would also need to determine which concentration levels (within the broad range of 20 to 100% by weight defined in claim 1) fulfill both of the above conditions i) and ii).

- Furthermore, the patent itself indicates (par. [0005]) that obtaining PVC hoses with plasticizer agents having low migration in order to maintain the flexibility substantially unaltered with time is a long-felt need in the field of hoses. It is thus not plausible that this step could be carried out simply by consulting publicly available commercial datasheets, moreover considering that the level of migration defined in claim 1 is not just low but zero, and that this characteristic must be accompanied by a cold flexibility falling within the defined range.

1.3 The board is therefore of the opinion that the skilled person would need to perform extensive experimentation in order to carry out the invention, and that in doing so, it would be confronted to an undue burden. The invention is therefore not sufficiently disclosed.

2. Auxiliary requests 5-11 - Article 83 EPC

The board has concluded that the invention defined in these requests does not meet the requirements of Article 83 EPC.

2.1 Claim 1 of auxiliary requests 5 to 11 does neither define the type of plasticizer/s to be used nor its/their concentration in the polymer material/s. Consequently, none of these requests obviates or even reduces the above-mentioned undue burden when attempting to reproduce the invention.

2.2 In fact, auxiliary requests 6,7,10 and 11 further increase the burden to carry out the invention by defining an additional condition to be fulfilled (i.e. the "Shore A hardness").

2.3 Consequently, the same arguments and conclusions presented for auxiliary request 4 apply to each of these requests.

3. Auxiliary requests 12-13 - Article 83 EPC

The board has concluded that these requests are not allowable under Article 83 EPC.

3.1 While the invention in these auxiliary requests is restricted to the plasticizer group of adipates, these requests explicitly encompass embodiments which do not fulfill the above-conditions i) and ii) in claim 1, in particular:

3.1.1 Claim 1 of auxiliary request 12 indicates that the plasticizer agent is "a mixture of monomeric and polymeric adipates".

3.1.2 Samples 1-8 in par. [0038] of the patent in suit describe different embodiments with plasticizers comprising a mixture of monomeric and polymeric adipates. However, none of the samples 1-7 fulfill both conditions i) and ii) of claim 1, so it is apparent that the invention defined in claim 1 of auxiliary request 12 cannot be carried out throughout most of the claimed range. Furthermore, as indicated in point 1.1.3 above, the only example fulfilling the conditions defined in claim 1 (i.e. "Samp 8") is itself insufficiently disclosed.

3.1.3 Claim 1 of auxiliary request 13 restricts the invention to a "monomeric adipate content ... in a range from 10% to 50%".

The samples 2, 5, 6 and 7 in paragraph [0038] fall within the claimed range and still fail to comply with at least one of the conditions i) and ii) in claim 1. Sample 8 fulfills the conditions, yet, as indicated in point 1.1.3, it is insufficiently disclosed. The invention defined in auxiliary request 13 is therefore also considered to be insufficiently disclosed.

4. Auxiliary request 14 - Article 83 EPC

The board has concluded that this request does not meet the requirements of Article 83 EPC.

4.1 Claim 1 of this request defines that the "plasticizer agent is a mixture of monomeric and polymeric adipates, the monomeric adipate content in said plasticizer agent being 10% by weight based on the weight of the plasticizer agent, the polymeric adipate content in said plasticizer agent being 90 % by weight based on the weight of the plasticizer agent".

The invention is thus restricted to a plasticizer with monomeric/polymeric adipate proportions as described in sample 8 of paragraph [0038] of the patent in suit.

4.2 While sample 8 in the patent fulfills both conditions i) and ii), the board has concluded that the invention defined in this request is not sufficiently disclosed for the following reasons:

- As indicated in point 1.1.3 above, the example identified as "Samp 8" in paragraph [0038] is insufficiently disclosed;

- Claim 3 of this request (dependent on claim 1) defines that "said plasticizer agent is selected from the group comprising adipates, benzoates, 1,2-propanediol and/or 1,3- and/or 1,4-butanediol and/or polypropylene glycol polyesters with adipic acid, acetic acid or C10-C18 fatty acids or n-octanol and/or n-decanol, trimellitates, phosphates, sebacates, alkyl sulphonates, epoxidized linseed and soybean oils, DINCH® and/or citrates, either alone or in combinations of two or more thereof refers to other groups of plasticizers". It is unclear whether these plasticizers are intended to be mixed with or to substitute those defined in claim 1. In either case, in view of the information in paragraphs [0029]-[0038] and figure 3 of the patent in suit, most plasticizers in this list would not satisfy conditions i) and ii) above. Therefore, it is apparent that the invention defined in claim 3 could not be carried out throughout most of the claimed range.

5. It is therefore concluded that none of the requests on file fulfills the requirements of Article 83 EPC.