Patent - Adhesives are compounds in a liquid or semi-liquid state that can adhere or bond items together. Adhesives are usually derived from fossil fuel, i.e. non-regenerative resources. Because of rising oil prices and environmental concerns, there is an increased demand for bio-based materials. Bio-based materials, such as polyesters polyols prepared by the polycondensation of plant-derived dicarboxylic acids and plant-derived diols have been employed in adhesive products because of their good technical properties and their sustainability as a renewable resource. However, in view of practical applications, the viscoelastic properties of these polymers need to be optimised by a cross-linking treatment. This cross-linking step is generally performed by treating the polyester with an isocyanate compound. Such combinations of plant-based polyesters and isocyanate cross-linkers have several drawbacks. Especially, it has been experimentally observed that the cured adhesive sheets display a hazy, translucent appearance after curing. Such a translucent character can be a serious drawback for various industrial applications where transparency is a key property, such as in packaging, surface protection and display applications. The problem underlying the present invention is to provide a bio-based adhesive composition exhibiting a high optical transparency and good adhesive characteristics. The present invention is directed to a bio-based composition comprising a polycondensate of a dimer of a fatty alcohol and a dimer of a fatty acid, and an epoxidized fatty acid ester as a cross-linking agent, wherein the polycondensate and the epoxidized fatty acid ester are capable of reacting with each other.
Source : EFA 11-09 02290000/EP-A1 NDN- 113-0416-5857-7 INVENTOR- Vendamme, Richard 6 De Gerlachestraat Apt.7 3500 Hasselt BE INVENTOR- Eevers, Walter 28 Keltenstraat 3520 Zonhoven BE PATENT ASSIGNEE- NITTO EUROPE N.V Ind. Park Genk Zuid-zone 12A Eikelaarstraat 22 3600 Genk BE PATENT ASSIGNEE- Nitto Denko Corporation 1-2, Shimohozumi 1-chome Ibaraki-shi Osaka 567-8680 JP PATENT APPLICATION NUMBER- 09011087 DATE FILED- 2009-08-28 PUBLICATION NUMBER- 02290000/EP-A1 PUBLICATION DATE- 2011-03-02 FIRM- GrAnecker, Kinkeldey, Stockmair & SchwanhA??usser AnwaltssozietA??t, Leopoldstrasse 4, 80802 MAnchen, DE INTERNATIONAL PATENT CLASS- C08L06708; C09J16708 FILING LANGUAGE- English DESIGNATED COUNTRY- , AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LI, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR, AL, BA, RS LANGUAGE- English
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