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Method of preventing the appearance of misting when coating flexible media with a crosslinkable liquid silicone composition in a multi-roll device

A flexible carrier, roll coating technology, applied in directions without pigment coating, coating, papermaking, etc.

Inactive Publication Date: 2009-06-24
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 of preventing the appearance of misting when coating flexible media with a crosslinkable liquid silicone composition in a multi-roll device
  • Method of preventing the appearance of misting when coating flexible media with a crosslinkable liquid silicone composition in a multi-roll device
  • Method of preventing the appearance of misting when coating flexible media with a crosslinkable liquid silicone composition in a multi-roll device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] Under an inert atmosphere, 40 g of toluene and 14 mg of a Karsted Pt solution of 10-12% Pt were added. The mixture was heated and stirred at 85°C, and then 51 g of units (CH 3 ) 2 HSio 1 / 2 End-blocked poly(dimethylsiloxane) oil (containing 0.2 equivalents of ≡SiH per 100 g) and 49 g of alkenyl-containing polyorganosiloxane oil (containing 0.035 equivalents of ≡SiVi per 100 g) were simultaneously poured into ( co-coulés) into the catalyst solution. The reaction medium is heated at 85° C. for a further 3 h. After "stripping" the volatiles, the resulting branched silicone oil had a viscosity of 2300mm 2 / s, containing 0.085 equivalent ≡SiH per 100g.

Embodiment 2

[0190] Under an inert atmosphere, 40 g of toluene and 14 mg of a Karsted Pt solution of 10-12% Pt were added. The mixture was heated and stirred at 85°C, followed by 51.6g of α,ω-SiH≡SiH silicone oil (containing 0.2 equivalents of ≡SiH per 100g) and 48.4g of silicone oil with pendant and terminal ≡SiVi units (containing 0.036 equivalents per 100g ≡SiVi) were simultaneously poured into the catalyst solution within 2 hours. The reaction medium is heated at 85° C. for a further 2 h until complete conversion of the ≡SiVi units is reached. After "stripping" the volatiles, the resulting branched silicone fluid has a viscosity of 283mm 2 / s, containing 0.081 equivalent of ≡SiH per 100g.

[0191] Comparative test of embodiment 2 (representative WO 01 / 98418 of prior art)

[0192] Under an inert atmosphere, 40 g of toluene and 14 mg of a Karsted Pt solution of 10-12% Pt were added. The mixture was heated and stirred at 85°C, then 50.4g per molecule Contains more than 3 ≡SiH units ...

Embodiment 3

[0194] Under an inert atmosphere, 40 g of toluene and 14 mg of a Karsted Pt solution of 10-12% Pt were added. The mixture was heated and stirred at 85°C, followed by 95.7 g of α,ω-SiH silicone oil (containing 0.2 equivalents of SiH per 100 g) and 4.3 g of cyclic silicone oil with ≡SiVi units (containing 1.13 equivalents of ≡SiVi per 100 g), The catalyst solution was simultaneously poured over 1.5 hours. The reaction medium is heated at 85° C. for a further 4 h until complete conversion of the ≡SiVi units is reached. After "stripping" the volatiles, the resulting branched silicone fluid has a viscosity of 103mm 2 / s, containing 0.14 equivalent ≡SiH per 100g.

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Abstract

The invention relates to the general field of coating various flexible media, such as sheets of paper or synthetic polymer (polyolefin, polyester, etc.) or else a textile, with a silicone on high-speed rolls. The invention relates to an effective method of preventing the appearance of misting when coating flexible media with a liquid silicone composition that is the precursor of crosslinked coatings, this coating operation being performed using a roll coater operating at 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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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08G77/42C08K5/5425C09D183/04D21H19/32
CPCC08G77/42C08G77/70D06M15/643C09D183/04D21H19/32D06M13/144C08L83/04D06M13/288C08G77/80D21H27/001D06M23/10D21H23/56C08G77/20C08G77/12C08L83/00
Inventor F·马格德T·爱尔兰L·冈比-加雷尔
Owner BLUESTAR SILICONES FRANCE SAS
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