Polyorganosiloxane release coating and method for its preparation and use

A polyorganosiloxane, release coating technology, applied in coatings, chemical instruments and methods, layered products, etc., can solve problems such as coating migration

Active Publication Date: 2019-10-25
DOW (SHANGHAI) HOLDING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Silicone release coatings are known to suffer from the disadvantage that if the release coating composition is formulated to have the desired ultra-low release force, the coating may suffer from migration

Method used

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  • Polyorganosiloxane release coating and method for its preparation and use
  • Polyorganosiloxane release coating and method for its preparation and use
  • Polyorganosiloxane release coating and method for its preparation and use

Examples

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example

[0090] These examples are intended to illustrate some embodiments of the invention to those skilled in the art and should not be construed as limiting the scope of the invention set forth in the claims. The following abbreviations are used: RF: release force (peel tester), CW: coating weight (Oxford XRF), RO: rub off (fix performance) and SAS: subsequent adhesion strength (migration performance).

[0091] RT: room temperature of 25°C. Table 1 below shows the starting materials used in these examples. Viscosities are measured at 25°C unless otherwise stated.

[0092] Table 1 - Starting materials for the examples

[0093]

[0094] Reference example 1-release coating preparation

[0095] Release coating composition samples were prepared by the following steps I. and II., using the starting materials and amounts indicated in the respective tables.

[0096] I. Add the following starting materials to a beaker: Mixture 1 (and one or more of A-2-1, A-2-2, E-1, and E-2, if prese...

example 1

[0108]

[0109] This example shows that adding more vinyl functional silsesquioxane A-2-1 shows lower RF and lower SAS. A SAS with 50% A-2-1 in the system still shows a good SAS because the SAS is above 85%. This example shows the benefit of using the release coating composition of the present invention to obtain a room temperature release force of less than 3 grams on a PET substrate.

example 2

[0111]

[0112] This example shows the release force reduction effect as the amount of vinyl functional silsesquioxane A-2-2 increases, and when increasing the amount of A-2-2 added to the release coating composition The release force and SAS remain stable when the amount is constant.

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Abstract

Provided is a release coating composition including a combination of branched polyorganosiloxanes. The first branched siloxane in the combination is an MDQ siloxane of unit formula: (R 1 3SiO 1 / 2) a(R2R 1 2SiO 1 / 2) b(R 1 2SiO 2 / 2) c(SiO 4 / 2) d, a>=0, b>0, c<=995, and d>0. The second branched siloxane in the combination is an MDT silsesquioxane of unit formula: (R 1 3SiO 1 / 2) e(R 2R 1 2SiO 1 / 2) f(R 1 2SiO 2 / 2) g(R 1SiO 3 / 2) h, e>=0, f>0, g<=995, and h>0. Each R 1 is independently a monovalent hydrocarbon group free of aliphatic unsaturation and each R 2 is an aliphatically unsaturated hydrocarbon group. The release coating composition further includes a crosslinker having at least 3 silicon-bonded hydrogen atoms per molecule, a platinum group metal catalyst and an inhibitor.

Description

[0001] field of invention [0002] The silicone release coating composition can be coated on a substrate such as film or paper and cured by a hydrosilylation reaction to form a release liner. The silicone release coating composition can provide one or more benefits over release liners known in the art, such as lower release force and / or good post-adhesion strength and / or low migration (for adhesives adhering to the back of a release liner and / or substrate). Release liners are useful in applications such as tape release, label release and / or adhesive transfer films. Background technique [0003] Silicone release coatings are useful in applications requiring a relatively non-adherent surface. Single-sided liners, such as the backing paper used for pressure-sensitive adhesive labels, are generally suitable for temporarily holding labels without affecting the label's adhesive properties. Double-sided liners, such as backing paper for double-sided and transfer tapes, are used to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/05C09D183/07
CPCC09D183/04C08G77/12C08G77/20C08K5/56C08L83/00C08G77/08C08L83/04C08K5/5415C08K9/10C09D7/40B32B27/08B32B27/283B32B2307/748C09J2483/005B32B2383/00Y10T428/31663
Inventor 黄福明刘志华
Owner DOW (SHANGHAI) HOLDING CO LTD
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