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Room temperature-curable organopolysiloxane composition

A technology of polyorganosiloxane and composition, applied in the direction of adhesives, etc., which can solve the problems of difficult to meet the adhesiveness and difficult to show adhesiveness of the resin, and achieve the effect of excellent adhesiveness and low odor

Active Publication Date: 2008-03-12
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Meanwhile, the durability of resins used for housings of electrical and electronic products and other parts has been improved, and as for such resins with improved durability, the adhesiveness of the resins to conventional sealants is often difficult to satisfy, and the aforementioned Compositions for sealing, bonding and coating electrical and electronic products have difficulty showing sufficient adhesion to such resins

Method used

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  • Room temperature-curable organopolysiloxane composition
  • Room temperature-curable organopolysiloxane composition
  • Room temperature-curable organopolysiloxane composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 20 parts by weight of trimethoxysiloxy-terminated polydimethylsiloxane with a viscosity of 20,000 mPa·s at 23°C and 80 parts by weight of trimethoxysiloxy-terminated polydimethylsiloxane with a viscosity of 900 mPa·s at 23°C To the polydimethylsiloxane mixture, 2 parts by weight of fumed silica with a specific surface area of ​​130 square meters per gram having been surface-treated with dimethyldichlorosilane was added, and the mixture was mixed in a mixer. Add to this mixture: 3 parts by weight of [dimer / trimer / tetramer / pentamer / hexamer / heptamer / octamer] containing tetramer and pentamer as main components Ratio = 12 / 26 / 22 / 15 / 11 / 8 / 6 (% by weight)] hydrolyzate mixture of methyltrimethoxysilane, 1 part by weight of diisopropoxybis(ethyl acetoacetate)titanium and 1 parts by weight of γ-glycidoxypropyltrimethoxysilane, and then the mixture was thoroughly mixed under reduced pressure to prepare Composition 1.

Embodiment 2

[0053] In addition to containing pentamers, hexamers and heptamers as the main component [ratio of tetramer / pentamer / hexamer / heptamer / octamer=1 / 33 / 31 / 23 / 12( % by weight)] of the methyltrimethoxysilane hydrolyzate mixture to replace the methyltrimethoxysilane hydrolyzate mixture containing tetramer and pentamer as the main components, repeat the process of Example 1 to prepare the composition 2.

Embodiment 3

[0055] The procedure of Example 1 was repeated except that the methyltrimethoxysilane hydrolyzate mixture containing tetramer and pentamer as the main constituent was replaced by the methyltrimethoxysilane hydrolyzate mixture containing 20-mer as the main constituent. process to prepare composition 3.

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Abstract

A room temperature-curable polyorganosiloxane composition is provided. The composition comprises (A) 100 parts by weight of a polyorganosiloxane represented by the following general formula (1): wherein R is a monovalent hydrocarbon group containing 1 to 5 carbon atoms, R<1 >is independently a substituted or unsubstituted monovalent hydrocarbon group containing 1 to 10 carbon atoms; n is an integer of at least 10; X is oxygen atom or an alkylene group containing 2 to 5 carbon atoms, and m is independently an integer of 0 or 1; or a mixture of such polyorganosiloxane, (B) 0.1 to 50 parts by weight of a partial hydrolysate of an organosilicon compound having at least 3 hydrolyzable groups bonded to silicon atom in one molecule; (C) 1 to 500 parts by weight of at least one filler, (D) 0.01 to 10 parts by weight of a curing catalyst, and (E) 0.1 to 10 parts by weight of a silane coupling agent. The present invention is capable of forming a rubber elastomer which exhibits excellent adhesion to resins whose adhesion has been difficult, for example, polyimide resin.

Description

technical field [0001] The present invention relates to room temperature curable polyorganosiloxane compositions which cure by reaction with moisture in the air to form rubber elastomers, and more particularly to room temperature curable polyorganosiloxane compositions , the composition can provide a rubber elastic body exhibiting good adhesion to resin substrates that have been difficult to adhere to in the past. Background technique [0002] Various types of room temperature curable polyorganosiloxane compositions are known in the art which cure to form elastomers at room temperature upon exposure to atmospheric moisture. Among them, alcohol-releasing room-temperature-curable polyorganosiloxane compositions cured by dealcoholization have been ideal for sealing electrical and electronic parts and for adhesive and coating applications, because this type The composition has no unpleasant smell and is corrosive to metals. [0003] A typical example of such a polyorganosiloxa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/14C08K3/36C09J183/14C08K3/26
CPCC08L83/14C08L83/04C08G77/18C08L83/00
Inventor 木村恒雄上野方也龟田宜良
Owner SHIN ETSU CHEM CO LTD
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