B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
B05D 1/34 (2006.01) B05D 5/08 (2006.01) C09D 183/04 (2006.01) C09J 7/04 (2006.01) D21H 19/32 (2006.01) D21H 27/00 (2006.01)
Patent
CA 2282678
The invention concerns a method for antiadhesive treatment by continuous coating of a paper strip, said coating containing a silicon composition with base of polyorganosiloxanes (POS) of the FC/LTC type. Said method consists in the use of a POS A, a crosslinking agent B (hydrosilylation and/or dehydrogenation-polycondensation), a catalyst C, and optionally, an inhibitor D, an adherence modulator E and other compounds F. Said constituents A to F are continuously mixed in measured amounts, the mixing conditions being selected such that the bath average life DVB is < 10H, that the bath homogeneity is such that its DSC (Differential Scanning Calorimetry) curve comprises a Gaussian peak, and such that the production flow rate of the A to F mixture is such that the duration d separating the moment when the constituents A, B and C are brought into the presence of one another and the moment when the mixture is applied to the unwinding strip, is not more than DVB. Said method also comprises the step (2) of conveying the composition to the coating site, the step (3) of coating the paper strip with the composition and the heat curing step (4).
The invention concems a method for antiadhesive treatment by continuous coating of a paper strip, laid coating containing a silicon composition with base of polyorganosiloxanes (POS) of the FC/LTC type. Said method consists in the use of a POS A, a crosslinking agent B (hydrosilylation and/or dehydrogena- tion-polycondensation), a catalyst C, and optionally, an inhibitor D, an adherence modulator E and other compounds F. Said con- stituants A to F are continuously mixed in measured amounts, the mixing conditions bcing selected such that the bath average life DVB is < 10H, that the bath homogeneity is such that its DSC (Dif- ferential Scanning Calorimetry) cutve comprises a Gaussian peak. and such that the production flow rate of the A to F mixture is such that the duration d separating the moment when the constituants A, B and C are brought into the presence of one another and the moment when the mixture is applied to the unwinding strip, is not more than DVB. Said method also comprises the step (2) of con- veying the composition to the coating site, the step (3) of coating the paper strip with the composition and the heat curing step (4). La présente invention a trait à un procédé de traitement anti-adhérent par enduction en continu d'une bande de papier, cette enduction comprenant une composition silicone à base de polyorganosiloxanes (POS) de type FGLTC. Selon ce procédé, on fait intervenir un POS A, un réticulant B (hydrosilylation etlou déshydrogénopolycondensation), un catalyseur C et, éventuellement, un inhibiteur D, un modulateur d'adhérence E et d'autres composés F. On mélange en continu et en quantités dosées ces constituants A à F en choisissant les conditions de mélange, de manière que la durée de vie de bain DVB, soit < 10 H, que l'homogénéité du bain soit telle yue sa signature DSC comprenne un pic gaussien, et de manière que le débit de production du mélange homog8ne A à F soit tel que la durée d séparant la mise en présence des composants A, B et C et le moment de l'application de la composition sur la bande support défilante, soit inférieure ou égale à la DVB. Ce procédé comporte également les étapes (2) d'acheminement de la composition sur le site d'enduction, l'étape (3) d'enduction de la bande de papier avec la composition et l'étape (4) de réticulation thermique.
Benayoun Jean-Paul
Guyot Christophe
Lievre Andre
Mirou Christian
Bluestar Silicones France
Rhodia Chimie
Robic
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