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Cross-linkable silicone composition for the production of non-stick coatings for flexible substrates and an attachment-promoting additive contained in said composition

A technology for organosilicon and composition, applied in the field of organosilicon composition, can solve the problems of delamination, inability to formulate, turbid formulation, etc., and achieve the effects of good friction coefficient, high peeling force, and excellent mechanical strength

Active Publication Date: 2013-06-12
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This additive has the major drawback of not being able to formulate with conventional cross-linking oils with hydrosiloxy units
This is because, when this type of additive is formulated with a cross-linking silicone oil having hydrosiloxy units, clouding and layering can occur in the formulation

Method used

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  • Cross-linkable silicone composition for the production of non-stick coatings for flexible substrates and an attachment-promoting additive contained in said composition
  • Cross-linkable silicone composition for the production of non-stick coatings for flexible substrates and an attachment-promoting additive contained in said composition
  • Cross-linkable silicone composition for the production of non-stick coatings for flexible substrates and an attachment-promoting additive contained in said composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] Example 1: Preparation of polyorganosiloxane C1 (Si-epoxy and SiH functionalized) - Invention

[0199] 200 g of toluene and 1.80 g of Pt / C (1.5% platinum) were introduced into the 1 L reactor. This mixture was left under stirring and heated to 80°C. A mixture of allyl glycidyl ether (AGE) (53 g, 0.465 mol) and polydimethylmethylhydrosiloxane (500 g, SiH = 1.75 mol) was added dropwise within half an hour. When the addition was complete, the heating was maintained for 1 hour. Heating was then stopped and after returning to ambient temperature, the reaction medium was filtered to remove Pt / C. Finally, the reaction medium was devolatilized at 80° C. for 3 hours at 10 mbar to obtain a functionalized silicone oil (516 g—yield: 93%) having the following properties:

[0200] [SiH]=0.25mol / 100g; [Epox]=75mmol / 100g; viscosity=13cP.

Embodiment 2

[0201] Example 2: Preparation of polyorganosiloxane C2 (Si-epoxy and SiH functionalized) - Invention

[0202] 100 g of toluene and 0.51 g of Pt / C (1.5% platinum) were introduced into a 500 mL reactor. This mixture was left under stirring and heated to 80°C. A mixture of allyl glycidyl ether (AGE) (17.5 g, 0.153 mol) and polydimethylmethylhydrosiloxane (150 g, SiH = 1.02 mol) was added dropwise over half an hour. When the addition was complete, the heating was maintained for 1 hour. Heating was then stopped and after returning to ambient temperature, the reaction medium was filtered to remove Pt / C. Finally, the reaction medium was devolatilized at 80° C. for 2 hours at 10 mbar to obtain a functionalized silicone oil (150 g—yield: 90%) having the following properties:

[0203] [SiH] = 0.53 mol / 100 g; [Epox] = 71 mmol / 100 g; viscosity = 21 cP.

Embodiment 3

[0204] Example 3: Preparation of Adhesion Additive Comp.1 (Si-epoxy and SiH functionalized) - Comparison

[0205]100 g of toluene and 0.64 g of Pt / C (1.5% platinum) were introduced into a 500 mL reactor. This mixture was left under stirring and heated to 80°C. A mixture of allyl glycidyl ether (AGE) (47.8 g, 0.419 mol) and polydimethylmethylhydrosiloxane (150 g, SiH = 1.02 mol) was added dropwise over half an hour. When the addition was complete, the heating was maintained for 1 hour. Heating was then stopped and after returning to ambient temperature, the reaction medium was filtered to remove Pt / C. Finally, the reaction medium was devolatilized at 80° C. for 2 hours at 10 mbar to obtain a functionalized silicone oil (169.2 g—yield: 85%) having the following properties:

[0206] [SiH] = 0.33 mol / 100 g; [Epox] = 181 mmol / 100 g; viscosity = 47 cP.

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Abstract

The invention relates to cross-linkable or cross-linked silicone compositions that can be used, in particular, to form a non-stick water-repellent coating for flexible substrates, for example paper or similar, in the form of natural or synthetic polymer films. Said compositions are of the type that comprise cross-linking polyorganosiloxanes bearing SiH units and unsaturated polyorganosiloxanes, preferably vinylated, capable of reacting with the cross-linking agent by means of an addition reaction in the presence of platinum in order to form the non-stick cross-linked coating on the flexible substrate and at least one attachment-promoting and cross-linking additive X. The aim of the invention is to provide novel liquid silicone coating compositions which are advantageously free of solvents and which can be cross-linked instantaneously into a water-repellent and / or non-stick coating for a flexible substrate, thereby producing cross-linked silicone coatings of a very high quality in terms of their attachment / adhesion to the substrate, high "rub-off" resistance and anti-adhesion profile (sufficiently high separation force at high speed), which properties are the product, in particular, of an attachment promoting additive.

Description

technical field [0001] The field of the invention relates to cross-linkable or cross-linked silicone compositions which are especially useful for forming anti-adhesive and waterproof coatings or films for flexible supports, for example made of paper or the like, and in the form of natural or synthetic polymer films. Background technique [0002] The hardenable release silicone compositions can be applied to the supports to facilitate removal of adhesive material reversibly bonded to the supports. [0003] These liquid silicone compositions are applied to a carrier film in an industrial coating device comprising a roll running at a very high speed (eg 600 m / min). Clearly, in these very high speed coating operations, the viscosity of the liquid silicone coating composition should be carefully adjusted to suit the coating operation conditions. [0004] In practice, the deposition rate of anti-adhesive silicone is 0.1-2, preferably 0.3-1 g / m 2 , which corresponds to a thickne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C08G77/38B05D5/08C09J7/02C09D183/07
CPCC08G77/38C08L83/00C09D183/04B05D5/086C09J7/22C09J7/30
Inventor S·马罗J·怀特M·费德尔F·马德
Owner BLUESTAR SILICONES FRANCE SAS
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