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Solvent-based release coating-forming organopolysiloxane composition and release film or sheet

A technology based on hydrogen polysiloxane, anti-stick coating, applied in the direction of coating, heat-activated film/sheet, film/sheet release liner, etc., which can solve the problem of satisfactory application and large peeling off of anti-stick coating To avoid problems such as force, damage, stickiness or adhesion of adhesive materials, to achieve excellent peeling performance and light peeling performance

Inactive Publication Date: 2010-09-29
DOW CORNING TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these compositions present some disadvantages such as impaired adhesion of tacky or adhesive materials and / or impaired printability due to silicone migration from the coating to the reverse side, and are not always suitable depending on the specific application. is satisfactory
In addition, cured release coatings produced by curing these compositions exhibit high peeling forces, and when peeling is performed at low speeds (speed = 0.3 m / min), a particular problem is that their light peeling capabilities are insufficient
[0006] Furthermore, previous references only describe silicone compositions that form cured release coatings that are cured by application of heat, they do not teach the ability to achieve reduced release forces that are different from Siloxane Migration Behavior and Velocity-Dependent Peel Properties Different from Peel Resistance Values

Method used

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  • Solvent-based release coating-forming organopolysiloxane composition and release film or sheet
  • Solvent-based release coating-forming organopolysiloxane composition and release film or sheet
  • Solvent-based release coating-forming organopolysiloxane composition and release film or sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0105] 100 parts by weight of a dimethylsiloxane-methylhexenylsiloxane copolymer (the viscosity of the 30wt% toluene solution of the copolymer=5,000mPa • s) (A1) was dissolved in 275.44 parts by weight of toluene (E1). Then, the following was added to the resulting solution and dissolved until uniform: 2.4 parts by weight of methylhydrogenpolysiloxane (silicon-bonded hydrogen content = 1.6 % by weight, viscosity = 20 mPa·s) (B1), 20 parts by weight of linear dimethylpolysiloxane (silicon-bonded hydrogen content = 0.01 % by weight, viscosity=400 mPa·s) (C1), 2 parts by weight of 3-methyl-1-butynyl-3-ol (G1) and 0.16 parts by weight of diethoxyacetophenone (F1). Chloroplatinic acid / 1,3-divinyltetramethyldisiloxane complex (D1) was additionally mixed in an amount to provide 200 ppm of platinum metal, thereby producing a solvent-borne silicone that forms a cured release coating. Oxane composition [1]. Cured coatings were prepared from this composition by the method described pr...

Embodiment 2

[0107] The solvent-borne silicone composition [2] for forming a cured release coating was prepared as described in Example 1, but in this case using 10 parts by weight of a dimethylhydrogensiloxy-capped at both ends of the molecule. Linear polysiloxane (silicon-bonded hydrogen content = 0.01 wt%, viscosity = 400 mPa·s) (C1) instead of 20 parts by weight of this component used in Example 1 (C1). Cured coatings were prepared from this composition by the method described previously and the resulting cured coatings were evaluated for peel force, residual adhesion (%) and silicone migration; the results are shown in Table 1.

Embodiment 3

[0109] The solvent-borne, cured release coating-forming silicone composition [3] was prepared as described in Example 1, but in this case using 20 parts by weight of a dimethylhydrogensiloxy-capped at both ends. Linear dimethyl polysiloxane (silicon-bonded hydrogen content = 0.02 wt%, viscosity = 135 mPa·s) (C2), instead of the 20 parts by weight used in Example 1, both ends of the molecule are composed of two Methylhydrogensiloxy-terminated linear dimethylpolysiloxane (silicon-bonded hydrogen content = 0.01 wt%, viscosity = 400 mPa·s) (C1). Cured coatings were prepared from this composition by the method described previously and the resulting cured coatings were evaluated for peel force, residual adhesion (%) and silicone migration; the results are shown in Table 1.

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Abstract

To provide a solvent-based release coating-forming organopolysiloxane composition exhibiting excellent release properties. The organopolysiloxane composition comprising (A) organopolysiloxane having two alkenyl groups, (B) organohydrogenpolysiloxane having at least three silicon-bonded hydrogen atoms bonded in side-chain position on the molecular chain, (C) straight-chain organohydrogenpolysiloxane having a viscosity at 25 DEG C of 2.5 to 2,000 mPas and silicon-bonded hydrogen at both molecular chain terminals, (D) a platinum-type catalyst, and (E) organic solvent and optionally (F) a photopolymerization initiator.

Description

technical field [0001] The present invention relates to release coating-forming organopolysiloxane compositions, and more particularly to solvent-borne release coating-forming organopolysiloxane compositions that form cured coatings that Exhibits excellent release properties on tacky or adhesive materials without causing their adhesion to decrease, exhibits excellent curing properties and light release force, and exhibits little migration of silicone from the coating to the reverse side. The invention additionally relates to release films or sheets. Background technique [0002] As a well-known method for obtaining materials exhibiting releasability to tacky or adhesive materials, a silicone composition forming a cured release coating is applied to a film or sheet substrate (e.g., paper, laminated paper, synthetic resin film, metal foil, etc.) and then form a cured coating by applying heat. As is known, the silicone composition used in this method to form the cured release...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09J7/02
CPCC09J2483/005C09D183/04C09J2205/31C09J7/0228C09J7/401C09J2301/416C08L83/00C08J5/18C08L83/04C09J7/22C09J7/30C09J7/35C09J7/40C09J7/405C09J2301/30
Inventor 山田修司山田高照
Owner DOW CORNING TORAY CO LTD
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