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Solvent-type curable organopolysiloxane composition, release sheet, and method for producing release sheet

A technology of polysiloxane and composition, applied in the field of solvent-based curable organopolysiloxane composition, peelable sheet and its manufacture, can solve difficult application of plastic film, low degree of polymerization, coating layer repellency, etc. question

Pending Publication Date: 2020-07-07
DOW TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Patent Document 1 or Patent Document 2 proposes a solvent-free silicone-based release agent that uses a relatively low degree of polymerization and low viscosity alkenyl-group-containing organopolysiloxane. In the case of coating on a plastic film, the repelling of the coating layer may easily occur and a uniform coating surface may not be obtained
In addition, as for the water-based emulsion-type release agent, it is difficult to apply to hydrophobic plastic films.

Method used

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  • Solvent-type curable organopolysiloxane composition, release sheet, and method for producing release sheet
  • Solvent-type curable organopolysiloxane composition, release sheet, and method for producing release sheet
  • Solvent-type curable organopolysiloxane composition, release sheet, and method for producing release sheet

Examples

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Embodiment

[0109] Hereinafter, examples of the present invention are shown together with comparative examples to explain the present invention more specifically, but the present invention is not limited to the following examples. In addition, in the following examples, "parts" indicating amounts mean parts by mass. In addition, vinyl (CH 2 =CH-) part represents the part of the carbon-carbon double bond in the alkenyl group bonded to the silicon atom that is the vinyl group (CH 2 =CH-) part, the content of the vinyl part in the entire molecular weight is expressed by mass%, and when the alkenyl group is a vinyl group, it simply means the "vinyl content". The viscosity is a value measured at 25°C. The measurement of the viscosity was performed using a cone-plate rotational viscometer DV1 model manufactured by BROOKFIELD.

[0110] [Applicability evaluation]

[0111] Each curable organopolysiloxane composition is 0.2g / m in terms of solid content conversion amount using a Meyer stick 2 The amoun...

preparation example 1

[0118] Put (A-1) polydimethylsiloxane having hexenyl groups at both ends of the molecular chain and side chains (viscosity 18400mPa·s, vinyl group (CH 2 =CH-) part content 0.82% by mass) 5.00 parts, (B) a molecular chain with a viscosity of 20 mPa·s at both ends of the trimethylsiloxy-terminated methyl hydrogen polysiloxane (the hydrogen part of the SiH group Content 1.6%) 0.12 parts, (C) chloroplatinic acid-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex (platinum metal content rate 0.6% by mass) 0.12 parts, (D) 0.01 parts of methylbutynol, (E) 50 parts of toluene and methyl ethyl ketone: 95.00 parts of a mixed solvent of 50 parts were uniformly mixed to obtain a curable organopolysiloxane composition ( 1).

preparation example 2

[0120] Instead of (A-1) component, use (A-2) polydimethylsiloxane having hexenyl groups at both ends and side chains of the molecular chain (viscosity 400mPa·s, vinyl group in hexenyl group (CH 2 The content of the =CH-) part (0.85% by mass)) 5.00 parts, and the method shown in Example 1 was used to obtain a curable organopolysiloxane composition (2).

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Abstract

The invention provides a solvent-type curable organopolysiloxane composition which has excellent handling workability including transportability in a state in which the content of an organic solvent is low, has excellent wet-ability / coat-ability to sheet-like substrates such as plastic films even when diluted with a large amount of organic solvent in a release sheet production process, and is capable of forming a release coating layer having a good release force and excellent stability over time; a release sheet using the composition; and a method for producing the release sheet. The present invention provides a solvent-type curable organopolysiloxane composition containing: (A) an organopolysiloxane having at least three C4-12 alkenyl groups in the molecule and a viscosity of 5,000-100,000 mPa.s; (B) an organic hydrogen polysiloxane; (C) a hydrosilylation catalyst; (D) a hydrosilylation reaction inhibitor; and (E) an organic solvent, wherein the content of a vinyl (CH2=CH-) moiety inthe alkenyl group is 0.1-5.0 mass%.

Description

Technical field [0001] The present invention relates to a sheet-like substrate that can be formed in a state where the content of organic solvents is small, including transportability, is excellent in handling workability, and is diluted with a large amount of organic solvents in the production process of a peelable sheet. Solvent-type curable organopolysiloxane composition for peeling the coating layer with excellent wettability / coating properties of the material, good peeling force, and excellent stability over time, a peelable sheet using the same, and a manufacturing method thereof . Background technique [0002] The following method is known in which a film-like or sheet-like substrate such as paper, laminated paper, plastic film, metal foil, etc. is coated with a releasable cured film-forming silicone composition and heated to form a cured film. In this way, a material that exhibits peelability with respect to the adhesive substance is obtained. As a silicone composition ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08J7/04C08L83/05C09D5/00C09D183/05C09D183/07C09D7/61C09D7/63C08J7/043
CPCB32B27/00C09D5/00C09D7/40C09D7/61C09D7/63C08J7/043C08G77/20C08G77/12C08L83/04C09D183/04C08J7/04
Inventor 田中英文远藤修司西嶋一裕小野寺哲谷俊和
Owner DOW TORAY CO LTD