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Silicone composition for coating a flexible support intended to form a crosslinked coating having increased attachment, mechanical strength and reactivity

A liquid polysiloxane, polysiloxane technology, applied in the direction of non-pigment coating, film/flake adhesive, device for coating liquid on the surface, etc., can solve the problem of loss of appearance, mechanical quality and crosslinking Issues with coatings, maintenance restrictions, premature wear, etc.

Active Publication Date: 2012-05-30
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0040] Furthermore, the ever increasing speed of the advancing line of the flexible carrier web on continuous coating devices leads to problems with mist or aerosols (fog, smoke) around the coating head
This mist has the following negative consequences: loss of consumables, appearance, mechanical quality (rub off), anti-adhesion capability of cross-linked coatings, industrial hygiene and safety of operators, rapid fouling of roll coating equipment, resulting in Maintenance restrictions and premature wear

Method used

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  • Silicone composition for coating a flexible support intended to form a crosslinked coating having increased attachment, mechanical strength and reactivity
  • Silicone composition for coating a flexible support intended to form a crosslinked coating having increased attachment, mechanical strength and reactivity
  • Silicone composition for coating a flexible support intended to form a crosslinked coating having increased attachment, mechanical strength and reactivity

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0126] As regards the preparation of the additive (or slurry), the oil / extender mixture is prepared using known and suitable equipment. For example, these devices may be paddle mixers, internal mixers, planetary mixers, plowshare mixers, co-rotating or counter-rotating twin-shaft mixers, continuous kneading-extruders or other batch or continuous Processing device. For more details, reference is made, for example, to applications WO-A-98 / 58997, WO-A-02 / 44259 and WO-A-02 / 18506.

[0127] Among the preferred embodiments are obtainable from LSR slurries consisting of fumed silica pre-dispersed in a viscous vinylated silicone oil and treated in situ with HMDZ and / or VMN. LSR is a polysiloxane elastomer composition, "Liquid Silicone Rubber", that cures upon heating in a catalytic combination containing at least one metal catalyst, preferably a platinum-based catalyst, and optionally at least one inhibitor. The presence of polyorganosiloxanes (in this case POS-E) with ≡Si-EU units (...

Embodiment 1 and 2

[0487] Examples 1 and 2: Trials with LSR30 additive (slurry).

[0488] Table 1'

[0489]

Embodiment 1

[0490] Example 1a = same formulation as Example 1 A-B1-D-LSR 30. Comparative Example CE 3: No filler but Nanocone VN 10000 additive.

[0491] Table 2'

[0492] preparation

Example 1a

CE 3

POS-A

100

100

POS-B1

8.2

8.2

Catalyst D

2.9

2.9

LSR 30 additive

5

Nanocone VN 10 000 Additive

5

[0493] -3- Mixing sequence and conditions of the baths used to prepare Examples 1, 1a and 2:

[0494] Step 1: Mix vinylated base polymer POS-A and additives (LSR 30) under mechanical agitation (with or without strong shear (UltraTurrax type)) by adding nanofillers to vinylated polymer POS-A to Optimal dispersion of nanofillers.

[0495] Step 2: The crosslinker POS-B (B1 or B2) was introduced into the mixture, still under mechanical stirring.

[0496] Step 3: Catalyst D was introduced into the mixture, still under mechanical stirring.

[0497] -4-Coating and crosslinking conditio...

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Abstract

The invention relates to crosslinkable or crosslinked silicone compositions capable of being used to form a water-repellent and release coating for a flexible support made of paper or of polymer, in particular that is heat-sensitive. These compositions are of the type of those comprising crosslinking polyorganosiloxanes (POSs) bearing =Si-H units and unsaturated, preferably =Si-Vi, vinyl-containing POSs, capable of reacting with the crosslinker by polyaddition, in the presence of platinum in order to form the crosslinked release coating on the flexible support.; The targeted objective is to enable the coating composition to crosslink instantaneously in order to produce, on all types of flexible supports (paper, e.g. glassine, or polymer, e.g. polyester such as polyethylene terephthalate PET), a crosslinked silicone coating endowed, in particular, on leaving the coating machine, with excellent attachment (adhesion) and mechanical strength or cohesion - "Rub-off" - properties. In order to achieve this objective, the invention proposes the use, per 100 parts by weight of silicone base, of 1 to 40 parts by weight of an additive comprising from 1 or 5 to 80% by weight of particulate filler, preferably nanoscale filler, in a silicone oil capable of reacting with the crosslinker. The supports and the high-speed coating processes are targeted. Applications: silicone release coatings obtained by crosslinking / polyaddition for flexible supports.

Description

technical field [0001] The field of the invention is that of crosslinkable or crosslinkable polysiloxane compositions which can be used in particular for forming waterproof and release coatings or films on fibrous or non-fibrous supports, for example made of of paper, etc., or of natural or synthetic polymers. [0002] More specifically, the present invention relates to those types of silicone compositions comprising: [0003] - functionalized polyorganosiloxanes (POS) carrying Si-H and Si-EU units on the same molecule or on different molecules, EU stands for unsaturation containing at least one alkenyl group (preferably vinyl group) group; Si-H unit can react with Si-EU unit by polyaddition; [0004] - and / or POS which can be crosslinked by cationic and / or free radical routes by crosslinking functional groups CFG containing at least one ethylenically unsaturated group, preferably acrylate and / or alkenyl ether, and / or epoxy and / or oxetane (oxetane) functional groups; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D183/07C09D7/12C09D5/00D21H19/40D21H19/62D06M15/643D06M11/79C08J7/04C09J7/02C09J7/04G09F3/10
CPCD06M15/643D06M11/79C09D183/04C08G77/16C08L83/04B05D5/08C08J3/24C08K3/34D21H19/32D21H19/40D21H19/62D21H21/14Y10T428/31663Y10T442/2861Y10T442/3976Y10T442/696C08L83/00
Inventor 米歇尔·费德尔亚西纳·马达迪
Owner BLUESTAR SILICONES FRANCE SAS
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