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Method for controlling onset of fog when coating flexible supports with a liquid silicone composition, in a cylinder-type device

A flexible carrier, silicone technology, applied in the direction of no pigment coating, coating, non-fiber pulp addition, etc., to achieve effective control

Inactive Publication Date: 2009-05-27
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coating fluids of this type should allow an increase in coating speed of at least 10 to 30 m / min, presumably due to limited fog formation

Method used

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  • Method for controlling onset of fog when coating flexible supports with a liquid silicone composition, in a cylinder-type device
  • Method for controlling onset of fog when coating flexible supports with a liquid silicone composition, in a cylinder-type device
  • Method for controlling onset of fog when coating flexible supports with a liquid silicone composition, in a cylinder-type device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0285] Under an inert atmosphere, 29.8 g of silicone oil containing 0.0597 equivalents of ≡SiOH / 100 g, 50 g of silicone oil containing 0.4 equivalents of ≡SiH / 100 g, 16 mg of Karsted Pt solution containing 10-12% Pt and 25.3 mg of ethynyl Ethyl Alcohol (ECH) Inhibitors. The mixture was heated and stirred at 120° C. for 6 hours until the conversion (TT) of ≡SiOH groups was ~95%. After cooling, add 2.64 mg of 168. The resulting branched silicone oil had a viscosity of 168 mm2 / s and contained 0.188 equivalents of ≡SiH / 100 g [ratio SiH:SiOH=11.2:1].

Embodiment 2

[0287] Under an inert atmosphere, 436.4 g of silicone oil containing 0.0597 equivalents of ≡SiOH / 100 g, 1020 g of toluene and 80 mg of IrCl(CO)(PPh 3 ) 2 catalyst. At ambient temperature, 523.7 g of a silicone oil comprising 0.4 equivalents of ≡SiH / 100 g were introduced into the mixture within 2 hours. The reaction medium is stirred for a further 2.5 h until the TT of the ≡SiOH groups is ~90%. After stripping of volatiles, the obtained branched silicone oil has a viscosity of 960 mm2 / s and contains 0.09 equivalents of SiH / 100 g [ratio SiH:SiOH=8:1].

Embodiment 3

[0289] Under an inert atmosphere, 0.86 g of a silicone oil containing 0.455 eq.≡SiOH / 100 g, 80 g of a silicone oil containing 0.052 eq.≡SiH / 100 g, 16 mg of a KarstedPt solution containing 10-12% Pt, and 25.7 mg of (ECH) inhibitor . The mixture was heated and stirred at 120°C for 6 hours until the TT of ≡SiOH was ~85%. After cooling, add 2.64mg of 168. The branched silicone oil obtained had a viscosity of 477 mm2 / s and contained 0.045 equivalents of ≡SiH / 100 g [ratio SiH:SiOH=10.6:1].

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Abstract

The invention concerns the general field of high speed silicone coating on various flexible cylinders, such as paper or synthetic polymer (polyolefin, polyester ), or textile sheets. The invention concerns an efficient method for controlling the onset of fog when coating flexible supports with a liquid silicone composition precursor of crosslinked coatings, said coating being performed using a cylinder-type coating device operating at a high speed.

Description

technical field [0001] The present invention relates to the general field of silicone coating of various flexible supports such as paper or sheets of synthetic polymers (polyolefins, polyesters, etc.) or textiles on high speed rolls. [0002] More specifically, the present invention relates to the use of liquid compositions comprising one or more polyorganosiloxanes crosslinkable by polyaddition, by dehydrocondensation, by polycondensation, by cationic or free radical routes for coating A flexible carrier to form a protective coating or film having, inter alia, anti-adhesion and / or hydrophobic properties. Background technique [0003] The flexible support can be paper, cardboard, plastic film or metal film. Applications of these silicone-coated supports are, for example, paper for food use (molds for pastry, packaging), labels / tapes, seals, and the like. [0004] The coating of these flexible supports with cross-linkable liquid silicones is carried out on continuously oper...

Claims

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Application Information

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IPC IPC(8): C08G77/12C08L83/04C09D183/04D21H19/32C08K5/5415
CPCD21H17/59C09D183/04C08G77/16C08K5/0008D21H19/32C08L83/04C08G77/12C08K5/5415
Inventor N·盖农尼T·爱尔兰L·冈比-加雷尔E·弗勒里D·达勒尔
Owner BLUESTAR SILICONES FRANCE SAS
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