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Solvent-free siloxane release agent composition for film and releasing film using the composition

A technology of siloxane and release agent, applied in the direction of coating, etc., can solve the problems of increased peel resistance of the pressure-sensitive adhesive layer, difficulty in peeling, good peelability, and inability to obtain the adhesion level of polyester-based films.

Active Publication Date: 2009-10-14
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 4, a satisfactory level of adhesion to the polyester-based film cannot be obtained, and in Patent Document 5, although the adhesion is improved, the peel resistance from the pressure-sensitive adhesive layer is significantly increased, This makes stripping difficult and makes it impossible to achieve the target level of good strippability
Also, Patent Document 6 proposes a two-layer coating method aimed at obtaining good adhesion and good peelability, but this method requires many steps to be added, so it is not ideal

Method used

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  • Solvent-free siloxane release agent composition for film and releasing film using the composition
  • Solvent-free siloxane release agent composition for film and releasing film using the composition
  • Solvent-free siloxane release agent composition for film and releasing film using the composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0090] - Preparation and use of the composition -

[0091] When preparing the silicone composition of the present invention, all components except component (E) are preferably mixed together uniformly first, and component (E) is preferably added last. Each component can be a single material or a combination of two or more different materials. However, the viscosity of the whole composition at 25°C must be in the range of 100-1500 mPa·s, and preferably 110-1300 mPa·s. If the viscosity of the composition exceeds 1500 mPa·s, coating performance is impaired, making actual application of the composition difficult.

[0092] -Peel off film-

[0093] The release film of the present invention includes a cured film of the silicone release agent composition formed on at least one surface of a plastic substrate film as described above.

[0094] A description of one example of a method of producing a release film is provided below, although the release film of the present invention is n...

Embodiment 1

[0115] Use 100 parts of branched dimethyl polysiloxane having an average of 2.4 dimethylvinylsilyloxy groups in each molecule and a viscosity of 260 mPa·s represented by the structural formula A-1 shown below As component (A),

[0116]

[0117] Using 9.5 parts of polysiloxane represented by the average structural formula B-1 shown below, having a vinyl number of 0.52 mol / g and a viscosity of 30 mPa·s as component (B),

[0118]

[0119] As component (C) [SiH / (SiCH=CH 2 )=1.8],

[0120]

[0121] And 0.3 part of 1-ethynyl 1-cyclohexanol was used as component (D).

[0122] These components (A)-(D) are mixed and stirred until a homogeneous mixture is obtained, then the formula: Pt / [H 2 C=C(CH 3 ) 2 Si] 2 A complex of platinum and vinyl siloxane represented by O is added to the mixture as component (E) in an amount sufficient to provide 98 ppm of platinum relative to the total mass of the composition, thus completing a silicone with a viscosity of 180 mPa·s Preparati...

Embodiment 2-6

[0124] [embodiment 2-6, comparative example 1-5]

[0125] Compositions of Examples 2-7 and Comparative Examples 1-6 were prepared by using the components of Example 1 and combinations of the components shown in Table 1 below.

[0126] Table 2 shows formulations of various compositions and measurements of physical properties of the compositions.

[0127] [Table 1]

[0128]

[0129]

[0130] (Evaluation of Examples)

[0131] The solvent-free silicone composition of the present invention not only exhibits good adhesion to plastic films after aging, but is also capable of forming cured films with excellent peelability.

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Abstract

The invention discloses a solvent-free siloxane release agent composition for film and a releasing film using the composition, namely a solidifiable siloxane release agent composition having good adhesiveness and excellent releasability to plastic film substrate and a releasing film of a solidified film of the composition formed at top of the plastic film substrate. The composition comprises two kinds of special organic polysiloxane containing alkenyl, organic hydrogenated polysiloxane, addition reaction delayed-action activator and platinum group metal catalyst, and has viscosity of 100 to 1,500mPa.s at 25 DEG C. The releasing film is prepared by forming releasable solidified film of the composition on the plastic film substrate.

Description

[technical field] [0001] The present invention relates to a solventless curable silicone release agent composition exhibiting excellent adhesion to plastic films. A release film comprising a cured film of the composition formed on top of a substrate film can be advantageously used as a pressure sensitive adhesive label or tape. [Background technique] [0002] Generally, in order to avoid blocking or adhesion between a substrate such as a plastic film or paper and a pressure-sensitive adhesive material, a cured film of the silicone composition has been formed on the surface of the substrate to impart release properties to the substrate. [0003] In this case, a widely used method for forming a silicone thin film on the surface of a substrate is one in which a platinum-based compound is used as a catalyst to conduct a reaction between an alkenyl group-containing organopolysiloxane and an organohydrogenpolysiloxane. Addition reaction between them, thereby forming a peelable th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08J5/18
CPCC08G77/20C08G77/44C08J5/18C08L83/04C08L83/10C08L2203/16C08L2205/02C08L2205/035C09D183/04
Inventor 伊东秀行板垣明成
Owner SHIN ETSU CHEM IND CO LTD