Matt polymerization adhesive

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 11/04 (2006.01) C08K 3/36 (2006.01) C09J 4/00 (2006.01)

Patent

CA 2477140

The adhesive bonding of matted PMMA with customary polymerization adhesives leads to very shiny bond seams, since the cured polymerization adhesives have a shiny surface. This emphasizes the very joining zones which it is intended that the viewer of bonded products should not perceive. The adhesive should therefore be matted after curing. The adhesive has for its basis a polymerization adhesive, preferably a (meth)acrylate-based adhesive. Two different kinds of silica are added as disperse powder to the polymerization adhesive, namely a silica powder having an average particle size of from 1 µm to 10 µm (matting agent) and a silica powder having an average particle size of more than µm up to 200 µm (texturing agent).

L'encollage de polyméthylméthacrylate maté (PMMA) à l'aide d'adhésifs de polymérisation habituels entraîne des soudures d'adhésion ultrabrillantes étant donné que les adhésifs de polymérisation durcis présentent une surface brillante. Par conséquent, les zones de jointure qui doivent rester invisibles pour l'observateur de produits collés, s'en trouvent particulièrement marquées. L'invention vise à obtenir un adhésif maté après durcissage. La base de l'adhésif selon l'invention est un adhésif de polymérisation, de préférence un adhésif à base (méth)acrylate. On ajoute à l'adhésif de polymérisation deux différents types d'acides siliques en tant que poudre dispersée, c.-à-d. une poudre d'acide silique présentant une granulométrie moyenne de 1 ?m à 10 ?m (agent de matage) et une poudre d'acide silique présentant une granulométrie moyenne de 10 ?m à 200 ?m (agent de structure).

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