Crosslinkable silicone coating compositions

A technology of polysiloxane and composition, applied in the direction of coating, devices for coating liquid on the surface, etc.

Active Publication Date: 2009-06-24
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this requires a hydrosilylation reaction, the implementation of which requires a noble metal catalyst

Method used

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  • Crosslinkable silicone coating compositions
  • Crosslinkable silicone coating compositions

Examples

Experimental program
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Embodiment and

[0129] Examples and Comparative Experiments :

[0130] Use a mixture of the following ingredients as a standard formulation:

[0131]100 parts by weight of various polymer siloxanes 1.1 to 1.4 according to the invention and comparative polymer siloxanes C1 to C4 with trimethylsiloxane end units and a viscosity of 25 mPa·s (25° C.) Straight-chain hydromethylsiloxane, the amount that ensures the molar ratio of SiH groups to unsaturated groups of various polymers is 1.6:1,

[0132] 1 part by weight of platinum-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex with a viscosity of 1000 mpa·s at 25°C in α,ω-diethylene A solution at a concentration of 1% by weight (based on elemental platinum) in dimethicone, and

[0133] 0.25 parts by weight of 1-ethynylcyclohexanol.

[0134] These mixtures are used to coat paper.

[0135] As a substrate, a paper with the trade name Glassine Silca Classic from the company Ahlstrom was used. Coating was carried out at 60 m / min on a Dixon coati...

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Abstract

The present invention relates to crosslinkable silicone coating composition comprising (1) organopolysiloxane(s) containing alkenyl groups and comprising per molecule at least one structural unit of the formula O3-n / 2RnSi-Y(SiRnO3-n / 2)a (I), at least 2 units of the formula R<1>RbSiO(3-b) / 2 (II), and units of the formula RcSiO(4-c) / 2 (III), where a is 1 or 2, b is 0, 1 or 2, c is 1, 2 or 3, n is 0 or 1, R at each occurrence may be identical or different and is a monovalent, SiC-bonded organic radical having 1 to 30 C atoms, optionally containing one or more nonadjacent O atoms and which is free from aliphatic carbon-carbon multiple bonds, and R<1 >is an alkenyl radical having 2 to 4 C atoms, preferably a vinyl radical, Y is a divalent or trivalent organic radical having 1 to 30 C atoms, with the proviso that the organopolysiloxanes (1) comprise units of the formula (II) in molar amounts such that the concentration of alkenyl radicals R<1 >in organopolysiloxanes (1) is less than 2 meq / g, (2) organopolysiloxanes containing Si-bonded hydrogen atoms, (3) at least one catalyst which promotes the addition of Si-bonded hydrogen to an aliphatic multiple bond, and (4) optionally, inhibitors.

Description

technical field [0001] The present invention relates to crosslinkable polysiloxane coating compositions and their use. Background technique [0002] US 5,241,034 describes siloxanes branched via hydrocarbon bridges which contain SiC-bonded ω-unsaturated groups. The ω-unsaturated groups are longer-chain alkenyl groups, preferably 5-hexenyl groups, via which groups these siloxanes can be crosslinked with organohydrogenpolysiloxanes in a Pt-catalyzed reaction. Hydrosilylation reactions are also used to prepare these branched siloxanes. Similarly, the reaction sequence catalyzed by Pt basically follows the statistical law. Polyalkenyl-functional organopolysiloxanes can be prepared using this technique. [0003] US 5,616,672 discloses rapidly crosslinking formulations comprising terminal alkenyl groups via the formula RSiO 3 / 2 The conventional T unit branched siloxane. This T unit can only be incorporated at a sufficient rate by a base-catalyzed process, which rules out a pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/07B05D7/24C09D183/05
CPCC08L83/14C09D183/04C08G77/50C08L83/04C09D183/14C08L83/00
Inventor C·赫尔齐希M·约阿希姆鲍尔H·劳滕施拉格尔
Owner WACKER CHEM GMBH
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