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Method for producing curable silicone sheet having hot melt properties

A manufacturing method and curable technology, applied in heat-activated films/sheets, chemical instruments and methods, flat products, etc., can solve defects, curable silicone sheet damage, curable silicone sheet is prone to damage, etc. question

Pending Publication Date: 2021-09-14
DOW TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when attempting to form a curable granular silicone composition into a sheet by a usual method, the curable silicone sheet is prone to breakage and defects, and it is required to obtain a product with excellent flatness and uniformity by a simple method. Method of hot-melt curable silicone sheet
[0006] On the other hand, Patent Document 6 describes a method of combining components including a silicone resin, a polyorganosiloxane, a silane crosslinking agent, a catalyst, and a solvent, and supplying the combination to an extruder in order to remove volatiles. A method for obtaining a condensation-curable hot-melt silicone adhesive composition from a device; and a method for molding the composition between release liners, but especially for a thermosetting hot-melt silicone composition, There is no description of the curable granular silicone composition. When trying to form a thermosetting silicone composition into a sheet by this method, the curable silicone sheet may be damaged or defective.
Moreover, when this production method is applied at a high temperature, in particular, a heat-curable hot-melt silicone composition may undergo a curing reaction, and it may not be possible to obtain a hot-melt sheet material.

Method used

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  • Method for producing curable silicone sheet having hot melt properties
  • Method for producing curable silicone sheet having hot melt properties
  • Method for producing curable silicone sheet having hot melt properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0392] The method for producing the hot-melt curable silicone sheet of the present invention will be described in detail using examples and comparative examples. In addition, in the formula, Me, Ph, and Vi represent a methyl group, a phenyl group, and a vinyl group, respectively. In addition, the softening point of the curable granular silicone composition constituting the curable silicone sheet was measured by the following method.

[0393] [Softening point of curable granular silicone composition]

[0394] The curable granular silicone composition is molded into cylindrical particles. The pellets were placed on a heating plate set at 25° C. to 100° C., and a load of 100 grams was continuously pressed from above for 10 seconds. After the load was removed, the amount of deformation of the pellets was measured. Let the temperature at which the amount of deformation in the height direction becomes 1 mm or more be the softening point.

[0395] Next, by the method shown in th...

reference example 1

[0396] [Reference Example 1: Non-thermofusible Polyorganosiloxane Resin Microparticles]

[0397] Into a 1L flask, put the white solid at 25°C from the average unit formula

[0398] (Me 3 SiO 1 / 2 ) 0.44 (SiO 4 / 2 ) 0.56 (HO 1 / 2 ) 0.02

[0399] 270.5 g of 55% by mass-xylene solution of polyorganosiloxane resin and 1,3-divinyltetramethyldisiloxane complex of platinum Disiloxane solution (content of platinum metal = about 4000ppm) 0.375g was uniformly stirred at room temperature (25°C) to prepare a xylene solution of polyorganosiloxane resin containing 10ppm of platinum metal by mass unit . In addition, this polyorganosiloxane resin does not soften / melt even when heated to 200° C., and does not have thermal fusibility.

[0400] The xylene solution of the polyorganosiloxane resin prepared above was removed by spraying with a spray dryer at 50°C, and the xylene was granulated to prepare a spherical non-thermofusible polyorganosiloxane Alkane resin particles. As a result o...

Embodiment 1

[0402] (a+c(pt)) 69.8 g of non-thermofusible polyorganosiloxane resin particles (vinyl content=0% by mass) obtained in Reference Example 1,

[0403] (b1) by the formula

[0404] ViMe 2 SiO(Me 2 SiO) 800 SiViMe 2

[0405] 29.9 g of dimethylvinylsiloxane-terminated dimethylpolysiloxane (vinyl group content = 0.09% by mass) at both ends of the molecular chain shown,

[0406] (c4(SiH)) is given by

[0407] Me 3 SiO(MeHSiO) 7 (Me 2 SiO) 6.5 SiMe 3

[0408] Expressed organohydrogenpolysiloxane 0.2g

[0409] {With respect to 1 mole of vinyl groups in the dimethylvinylsiloxane-terminated dimethylpolysiloxane at both ends of the molecular chain, the silicon atom in the organohydrogenpolysiloxane is 1.4 moles bonded to hydrogen atoms amount},

[0410] (d1) 234.4 g of alumina (AES-12 manufactured by Sumitomo Chemical) with an average particle diameter of 0.44 μm,

[0411] 1-Ethynyl-1-cyclohexanol (in an amount of 1000 ppm by mass unit relative to the present composition) w...

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Abstract

The invention provides: a method for efficiently producing a curable silicone sheet which exhibits excellent flatness and uniformity, and which is formed from a curable granular silicone composition that has hot melt properties, excellent handling properties and excellent curing characteristics; and a method for producing a multilayer body which comprises this curable silicone sheet. A method for producing a curable silicone sheet having hot melt properties, which is characterized by comprising: a step 1 wherein organopolysiloxane resin fine particles, a curing agent ad a functional filler are mixed with each other; a step 2 wherein the mixture obtained in the step 1 is kneaded, while being heated and melted; a step 3 wherein the heated and melted mixture obtained in the step 2 is interposed between films that have at least one release surface; and a step 4 wherein the multilayer body obtained in the step 3 is stretched between rolls, thereby molding a curable silicone sheet that has a specific film thickness.

Description

technical field [0001] The present invention relates to a production method and a laminate. The production method is simple, and can obtain a hot-melt curable silicone sheet with excellent flatness and uniformity. The laminate can be obtained by the production method. A structure in which a hot-melt curable silicone sheet is laminated between films having at least one peeling surface. Background technique [0002] Curable silicone compositions are used in a wide range of industrial fields because they cure to form cured products having excellent heat resistance, cold resistance, electrical insulation, weather resistance, water resistance, and transparency. The cured product of such a curable silicone composition is generally less likely to be discolored than other organic materials and has little decrease in physical properties, so it is also suitable as an encapsulant for optical materials and semiconductor devices. [0003] In Patent Document 1 and Patent Document 2, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/18B29K83/00B32B27/00C09J11/04C08L83/04C09J183/04C09J7/30B29C48/08B29C48/154B29C48/25B29C48/305B29C48/88
CPCB29C48/08B29C48/88B29C55/18B32B27/00C08L83/04C09J183/04C08J5/18C08J2383/04B29C48/022B29K2083/00B29K2105/246B29C48/0021C08K3/013C08K5/0025C08G77/80C08G77/70C08G77/20C08G77/12C09D183/04C08K3/36C08K5/56C08L83/00B29C48/0018B29C48/154B29C48/305C09J11/04C09J7/30B29L2007/002C09J7/35C08G77/24C08K5/14C08K9/06
Inventor 今泉彻尾崎弘一山崎亮介
Owner DOW TORAY CO LTD