Silicone adhesive composition, method for making the same and adhesive film

A technology of silicone adhesive and composition, which is applied in the direction of film/sheet adhesive, adhesive, transportation and packaging, etc. It can solve the problem that it is difficult to sufficiently reduce the amount of low-molecular siloxane and the adhesive tape has poor adhesion , Poor transparency of the composition, etc., to achieve the effects of inhibiting the adhesion of foreign matter such as silica on the surface of the cured product, reducing migration, and excellent heat resistance

Inactive Publication Date: 2015-09-30
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the literature, the reduction of the amount of low-molecular siloxane in component (a) can be achieved by thin-film stripping. quantity
In this composition, the main chain of the component (A) is not -O-Si-O-Si-O-, but -O-Si-CH 2 -CH 2 The structure of -Si-O- contains a large number of carbon-carbon bonds, so the heat resistance is poor, which is unfavorable
In addition, the viscosity of the component (a) is lower than that used in ordinary silicone adhesives, and the adhesive tape may be poor in adhesiveness
Furthermore, component (A) is obtained by reacting in the presence of a catalyst, and therefore, the catalyst may remain in component (A) to cause discoloration and poor transparency of the composition.

Method used

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  • Silicone adhesive composition, method for making the same and adhesive film
  • Silicone adhesive composition, method for making the same and adhesive film
  • Silicone adhesive composition, method for making the same and adhesive film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0106] Hereinafter, the present invention will be described in detail using Examples and Comparative Examples, but the present invention is not limited to the following Examples. In addition, "part" and "%" represent "mass part" and "mass %", respectively, Me represents a methyl group, and Vi represents a vinyl group. In the following description, the viscosity is a value at 25°C measured by a rotational viscometer.

[0107] The measurement conditions of gas chromatography (GC) are as follows.

[0108] Gas chromatograph: Capillary gas chromatograph (Hitachi G-3500)

[0109] Column: DURABOND.DB-5MS from J&W Company (0.53mm×30m×1.0μm)

[0110] Detector: FID, temperature 300℃

[0111] Heating program: 50°C→10°C / min→280°C (17 minutes)

[0112] Injection port temperature: 270℃

[0113] Carrier gas: Helium (5ml / min)

[0114] Injection volume: 2 μl.

[0115] The following test methods were used.

[0116] initial adhesion

[0117] The silicone adhesive composition was applie...

preparation example 1

[0122] Preparation Example 1: Preparation of (A1) or (A2) Component Using Stripping

[0123] A raw rubber-like diorganopolysiloxane (A') having a viscosity of 18,000 mPa·s and a vinyl content of 0.15 mol % when dissolved in toluene at a concentration of 30% represented by the following formula (4) ) 100 parts by weight were dissolved in 100 parts by weight of toluene to obtain a toluene solution. The operation of stripping the solution at 160° C. and 20 mmHg while stirring was performed once to obtain the component (A1). In addition, the said vinyl content shows the ratio (mol%) of the amount of vinyl groups with respect to the total amount of the organic group (methyl group and vinyl group) in the said diorganopolysiloxane (A').

[0124] XMe 2 SiO (ViMeSiO) m (Me 2 SiO) n SiMe 2 X (4).

[0125] Here, X existing at both ends is a Vi group or an OH group in common, m and n are as defined above, and m+n is the viscosity of the diorganopolysiloxane when dissolved in tolu...

Embodiment 1

[0128] Mix the following ingredients:

[0129] 35 parts of (A1) component obtained in Preparation Example 1,

[0130] Contains Me 3 SiO 0.5 Cell and SiO 2 Units of organopolysiloxane (component (B)) (Me 3 SiO 0.5 Unit / SiO 2 Unit = 0.85) 60% toluene solution 108.3 parts,

[0131] 23.7 parts of toluene,

[0132] SiH group-containing organohydrogenpolysiloxane of the following formula (component (C)) 0.22 parts,

[0133] Me 3 SiO (HMeSiO) 40 SiMe 3 ,as well as

[0134] Ethynylcyclohexanol (component (D)) 0.20 part.

[0135] To the above mixture (about 60% of the siloxane component) (100 parts), toluene (50 parts) and a platinum-vinyl group-containing siloxane complex (component (E)) containing 0.5 mass % of the platinum component were added. A toluene solution (0.5 part) was further mixed to prepare a silicone adhesive composition having a silicone content of about 40%. With respect to the obtained silicone adhesive composition, each test was performed according to ...

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Abstract

A purpose of the present invention is to provide a silicone adhesive composition which comprises no antioxidant, has sufficient adhesive and tack properties, has excellent heat resistance and which, in tested use, leaves no adhesive residue. Another purpose is to provide adhesive film and tape having a cured layer obtained from the composition. The invention provides an addition curable or peroxide curable silicone adhesive composition, wherein the addition curable silicone adhesive composition comprises (A1) a diorganopolysiloxane having an alkenyl group and a viscosity at 25 degrees C of 100,000 mPa·s or more, (B) an organopolysiloxane having R 1 3 SiO 0.5 units and SiO 2 units, wherein R 1 is a substituted or unsubstituted, monovalent hydrocarbon group having 1 to 10 carbon atoms, (C) an organohydrogenpolysiloxane having at least three SiH groups, (D) optionally an addition reaction inhibitor, (E) a platinum group metal catalyst for an addition reaction, and (F) an organic solvent, and the peroxide curable silicone adhesive composition comprises (A2) a diorganopolysiloxane having a viscosity at 25 degrees C of 100,000 mPa·s or more and may or may not have an alkenyl group, (B) an organopolysiloxane having R 1 3 SiO 0.5 units and SiO 2 units, wherein R 1 is a substituted or unsubstituted, monovalent hydrocarbon group having 1 to 10 carbon atom, (F) an organic solvent, and (G) an organic peroxide, and components (A1) and (A2) may be accompanied with octamethylcyclotetrasiloxane and/or decamethylcyclopentasiloxane and each content of octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane is less than 0.1 mass %, based on a total amount of component (A1) or (A2), component (B) and octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane.

Description

[0001] Invention name [0002] The present invention relates to a silicone adhesive composition, a method for producing the same, and an adhesive film and an adhesive tape having the silicone adhesive composition layer. When the adhesive film and adhesive tape are heated at 260° C. or higher for a long time in the process of processing precision parts, optical parts, or electronic parts, they are suitable for applications in which they are attached for the purpose of protecting and masking parts. Background technique [0003] The silicone adhesive layer is excellent in heat resistance, cold resistance, weather resistance, electrical insulation and chemical resistance. Therefore, the adhesive tape and the adhesive label having the silicone adhesive layer are used in severe environments where other adhesives such as acrylic, rubber, urethane and epoxy adhesives are deteriorated or deteriorated. . [0004] As one of such environments, there is an environment exposed to a high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/07C09J183/04C09J183/05C09J7/02
CPCC08G77/34C09J183/14C08L83/04C08G77/20C08G77/12Y10T428/2852C09J183/04C08L83/00
Inventor 黑田泰嘉小林优太
Owner SHIN ETSU CHEM IND CO LTD
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