JPS60206885A - Silicone rubber elastomer with pressure-sensitive adhesive - Google Patents

Abstract

PURPOSE:To provide the titled elastomer which can be firmly bonded to various adherends, by bonding a silicone rubber elastomer and a pressure-sensitive adhesive to each other through a specified bonding aid and a room-temperature curing liquid silicone rubber to integrate them. CONSTITUTION:Silica powder, carbon powder, a blowing agent, etc. are blended with a silicone rubber such as dimethylpolysiloxane, and the silicone rubber is then crosslinked in the presence of an org. peroxide such as benzoyl peroxide to obtain a silicone rubber elastomer 1. A pressure-sensitive adhesive layer 2 mainly composed of an acrylic resin copolymer or nutural rubber and a styrene/butadiene copolymer which is removably provided on one side of a separator 3, is bonded to said elastomer 1 through a bonding aid 4 mainly composed of a polyurethane resin or a chloroprene polymer, a chlorinated rubber and a silane coupling agent and a room-temperature curing liquid silicone rubber 5 to integrate them.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a silicone rubber-like elastomer whose main component is silicone rubber, a pressure-sensitive adhesive of acrylic resin or natural rubber and styrene getadiene, and a pressure-sensitive adhesive of polyurethane resin or chloroprene polymer. This invention relates to a silicone rubber-like elastic body with a pressure-sensitive adhesive, which is formed by curing and bonding an adhesion aid mainly composed of chlorinated rubber and a silane coupling agent, and liquid silicone rubber.

Conventionally, it has been known that silicone rubber-like elastic bodies mainly composed of silicone rubber are non-viscous and therefore difficult to stick to other companies' materials. For this reason, it is possible to bond with a silicone adhesive or liquid silicone rubber, but it has the disadvantages of low adhesive strength and limitations on the adherends.
There were drawbacks.

This invention improves and eliminates the above-mentioned disadvantages and drawbacks, and improves the non-adhesive properties of a silicone rubber-like elastomer mainly composed of silicone rubber, thereby creating a pressure-sensitive adhesive with high tack and adhesive strength. The purpose of the present invention is to provide a silicone rubber-like elastic body with a pressure-sensitive adhesive that can strongly bond silicone rubber-like elastic bodies to various adherends. be.

This invention provides a silicone rubber-like elastic material whose main component is silicone rubber, and a pressure-sensitive adhesive whose main components are an acrylic resin copolymer or a natural rubber and styrene getadiene copolymer, and a polyurethane resin or chloroprene. It is made by bonding and integrating an adhesion auxiliary agent whose main components are a polymer, chlorinated rubber, and a silane coupling agent, and a room temperature-curable liquid silicone rubber.

To explain this in more detail, the composition of the present invention includes a silicone rubber-like elastic body mainly composed of silicone rubber, a polyurethane resin or chloroprene polymer as an adhesion aid, chlorinated rubber, and a silane coupling agent. A primer whose main component is a room temperature-curable liquid silicone rubber as an adhesive, a pressure-sensitive adhesive whose main component is an acrylic resin copolymer or a natural rubber and styrene getadiene copolymer, and a separator to protect it. It consists of

The method for producing a silicone rubber-like elastic body with a pressure-sensitive adhesive shoulder according to the present invention includes applying a primer, which is an adhesion aid, to one side of the pressure-sensitive adhesive on the side to be bonded to the silicone rubber-like elastic body. Forms an adhesion auxiliary film on the adhesive. Since this adhesion auxiliary film, the pressure-sensitive adhesive, and the room-temperature-curing liquid silicone rubber adhere strongly, next, a room-temperature-curing liquid silicone rubber is applied over this primer treatment, and then the room-temperature-curing liquid silicone rubber By closely adhering and curing bonding the silicone rubber-like elastic body mainly composed of silicone rubber on top of the silicone rubber-like elastic body, a pressure-sensitive adhesive-attached silicone rubber-like elastic body can be easily and reliably obtained.

Next, this will be explained based on the attached drawings. The silicone rubber-like elastic body 1 whose main component is silicone rubber shown in FIG. A pressure-sensitive adhesive 2 and a separator 3 releasably fixed to one side of the pressure-sensitive adhesive 2; in FIG. 2, an adhesion aid is applied to the other side of the pressure-sensitive adhesive 2 and dried. Auxiliary H * 4 Next, as shown in FIG. 3, liquid silicone rubber 5 is applied on the adhesion auxiliary film 4, and a silicone rubber-like elastic body 1 is tightly adhered thereon as shown in FIG. Then, they are cured and bonded together to obtain a silicone rubber-like elastic body with a pressure-sensitive adhesive.

The silicone rubber-like elastomer mainly composed of silicone rubber used in this invention is dimethylpolysiloxane,
Methylphenylpolysiloxane.

Examples include silicone rubber such as methylvinyl polysiloxane, which is further compounded with silica powder, carbon powder, metal powder 2 blowing agent, and other fillers, and crosslinked with organic peroxides such as benzoyl peroxide and dicumyl peroxide. It will be done. Pressure-sensitive adhesives include acrylic resin copolymers or natural rubber and styrene getadiene copolymers blended with tackifiers, thickeners, and solvents;
Examples include paper, cloth, etc. impregnated with this. Examples of adhesion aids include those made of polyurethane resin or chloroprene polymer containing chlorinated rubber, silane coupling agent, and ethyl acetate. In addition, as a room-temperature curing liquid silicone rubber, a basic combination of α,ω dihydroxydimethylpolysiloxane containing a hydroxyl group at the end and a polyfunctional silane as a crosslinking agent is used, and fillers such as silica powder and calcium carbonate are cured with an adhesion promoter. Examples include those containing accelerators as ingredients. Note that the separator 3 is to be peeled off before use.

Next, examples of the method for manufacturing a component of the present invention will be given, but these are not intended to limit the scope of the present invention.

(Example 1) As a silicone rubber elastic body, 0.5 parts of a crosslinking agent (C-8A, manufactured by Shin-Etsu Chemical Co., Ltd.) was mixed and kneaded with 100 parts of a silicone rubber compound (KE-961U, manufactured by Shin-Etsu Chemical Co., Ltd.). Cross-linked to 3H sheet 150x150m
One m square sheet was obtained.

Next, pressure-sensitive adhesive with separator (manufactured by Nitto Electric Industry Co., Ltd.
Adhesion aid (Primer No. X-33-013 manufactured by Shin-Etsu Chemical Co., Ltd.) on one side of double-sided adhesive tape No. 501K)
) was applied and air-dried for 30 minutes at room temperature to obtain one 150×150 dragon square piece of pressure-sensitive adhesive with an adhesion auxiliary film.

Next, a room temperature curing liquid silicone rubber (KE-, manufactured by Shin-Etsu Chemical Co., Ltd.,
47) was applied, and the silicone rubber sheet prepared above was closely adhered thereon and left at room temperature for 48 hours to obtain a pressure-sensitive adhesive-attached silicone rubber elastic body.

Table 1 shows the 180° peel strength of this, one in which a pressure-sensitive adhesive was directly pressure-bonded to a silicone rubber sheet, and one in which a pressure-sensitive adhesive and a silicone rubber sheet were bonded via liquid silicone rubber.

Table 1 ゛ (Unit: g/10m) (Example 2) Conductive silicone rubber compound (manufactured by Toray Silicone Co., Ltd. 5E6759U) as the silicone rubber elastic body
Crosslinking agent (manufactured by Torre Silicone Co., Ltd.) per 100 parts
RC-4) 2 parts were mixed and kneaded and cross-linked into a sheet with a thickness of 5 mm to obtain one 150×150 haze square sheet.

Next, an adhesion aid (manufactured by Shin-Etsu Chemical Co., Ltd., primer No. G-50) was applied to one side of a pressure-sensitive adhesive with a separator (single-sided tape No. 9469, manufactured by Jujutsu 3M Co., Ltd.), and air-dried for 30 minutes at room temperature. One square sheet of 150×150+n of pressure-sensitive adhesive with an adhesion auxiliary film was obtained.

Next, a room temperature curing liquid silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., KE-4) was added onto the pressure-sensitive adhesive with the adhesion auxiliary film.
41T) was applied thereon, the conductive silicone rubber sheet prepared above was closely attached thereto, and the conductive silicone rubber sheet was left at room temperature for 48 hours to obtain a conductive silicone rubber elastic body with a pressure-sensitive adhesive.

Table 2 shows the adhesive strengths of this and those using a conventional silicone rubber layer adhesive.

Table 2 (Unit: kg/ca)

[Brief explanation of drawings]

FIG. 1 is a perspective view of a silicone rubber elastic body and a pressure-sensitive adhesive with a separator before they are integrated, and FIG. 2 is a cross-sectional view of the pressure-sensitive adhesive coated with an adhesion auxiliary agent to form an adhesion auxiliary film. Figure 3 is a cross-sectional view of a pressure-sensitive adhesive with liquid silicone rubber applied onto the adhesion auxiliary layer, and Figure 4 shows the silicone rubber elastic body and pressure-sensitive adhesive bonded together via the adhesion auxiliary layer and the liquid silicone rubber layer. A cross-sectional view of each unit is shown. 1.-Silicone rubber-like elastic body, 2.-Pressure sensitive adhesive,
4-adhesion auxiliary film, 5-.-liquid silicone rubber. Patent Applicant: Inaba Rubber Co., Ltd. Agent Patent Attorney: Mihiko Watanabe, Wf. Written amendment (voluntary) April 28, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 2, Name of the invention with pressure-sensitive adhesive Silicone rubber-like elastic body 3, relationship with the amended person case Patent applicant address 3-7-3 Edobori, Nishi-ku, Osaka Name Inaba Rubber Co., Ltd. Representative director Toshinori Okamoto 4, agent Address: 530 Osaka 06 (361) 38
31 Address: 2-21 Taiyuji-cho, Kita-ku, Osaka (1) Claims column 6 of the specification, content of amendments (1) The above (1) is as attached (2) The above (2)
), as follows: a) "Styrene getadiene" on page 1, line 16 of the specification is amended to "styrene butadiene." ``Styrene getadiene'' on page 2, line 18 of the specification is amended to ``styrene butadiene.'' c) "Styrene getadiene" on page 3, line 11 of the specification is amended to "styrene butadiene." 2) "Styrene getadiene" in the fifth true line 7 of the specification shall be amended to "styrene butadiene." e) "Filler, adhesion promoter, curing accelerator" on page 5, line 17 of the specification shall be amended to "filler, adhesion promoter, curing accelerator." Above -2 A silicone rubber-like elastic body with a pressure-sensitive adhesive, which is formed by bonding and integrating a resin or an adhesion aid mainly composed of a chloroprene polymer, chlorinated rubber, and a silane coupling agent, and a room-temperature-curable liquid silicone rubber.

Claims (1)

[Claims] +11 A pressure-sensitive adhesive whose main components are an acrylic resin copolymer or a natural rubber and styrene getadiene copolymer is applied to a silicone rubber-like elastic body whose main component is silicone rubber, and a polyurethane resin or chloroprene. A silicone rubber-like elastomer with a pressure-sensitive adhesive, which is made by integrally bonding a room-temperature-curable liquid silicone rubber with an adhesion auxiliary agent mainly consisting of a chlorinated rubber and a silane coupling agent.