Curable compositions of resin-linear organosiloxane block copolymers

A curable composition, organosiloxane technology, applied in the direction of electrical solid devices, semiconductor/solid device components, coatings, etc., can solve problems such as difficult application, non-durability, lack of toughness of coatings, etc.

Active Publication Date: 2014-10-22
DOW SILICONES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many currently available coatings lack toughness, are not durable, do not last and / or are not easily applied

Method used

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  • Curable compositions of resin-linear organosiloxane block copolymers
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  • Curable compositions of resin-linear organosiloxane block copolymers

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0237] Containing at least 60 mole % of [R 2 SiO 3 / 2 ] Organosiloxane resins having siloxy units and methods for their preparation are known in the art. They are usually prepared by hydrolyzing organosilanes with three hydrolyzable groups (such as halogen or alkoxy groups) on the silicon atom in an organic solvent. Representative examples for preparing silsesquioxane resins can be found in US Patent No. 5,075,103. Additionally, many organosiloxane resins are commercially available and sold as solids (flakes or powders) or dissolved in organic solvents. Suitable non-limiting commercially available organosiloxane resins that can be used as component b) include: Dow 217Flake Resin (sheet resin), 233Flake, 220Flake, 249Flake, 255Flake, Z-6018Flake (Dow Corning Company, Midland, MI).

[0238] Those skilled in the art also recognize that containing such high amounts of [R 2SiO 3 / 2 ]Organosiloxane resins with siloxy units and silanol content can also retain water molecules, es...

example

[0263] The following examples are included to illustrate specific embodiments of the invention. However, those of skill in the art should, in light of the present invention, appreciate that many changes can be made in the specific embodiments which are disclosed and still obtain a similar or equivalent result without departing from the spirit and scope of the invention. All percentages are % by weight. All measurements are at 23°C unless otherwise indicated.

[0264] Characterization technology

[0265] 29 Si and 13 C NMR spectrum

[0266] By mixing approximately 3 g of solvent-free resin-linear copolymer (prepared by drying the sample at room temperature overnight), 1 g of CDCl 3 and 4 grams of 0.04M Cr(acac) 3 CDCl 3 The solution was weighed into a vial and mixed thoroughly to prepare an NMR sample of the resinous linear product. Samples were then transferred into silicon-free NMR tubes. Spectra were acquired with a Varian Mercury 400MHz NMR. by diluting ...

example 1

[0277] Example 1 (reference)

[0278] Preparation of PhMe resin linear products using 47dp diacetoxy-terminated PhMe siloxane

[0279] Composition: (PhMeSiO 2 / 2 ) 0.52 (PhSiO 3 / 2 ) 0.41 (45% by weight phenyl-T)

[0280] A 500 mL 4 neck round bottom flask was charged with Dow Corning 217 Flake (45.0 g, 0.329 mol Si) and toluene (Fisher Scientific, 70.38 g). The flask was equipped with a thermometer, a Teflon stirring impeller and a Dean Stark apparatus attached to a water-cooled condenser. A nitrogen blanket was applied, the Dean Stark apparatus was preloaded with toluene, and an oil bath was used for heating. The reaction mixture was heated at reflux for 30 minutes. After cooling the reaction mixture to 108°C, a solution of the diacetoxy terminated PhMe siloxane was added rapidly. By adding 50 / 50 wt% methyltriacetoxysilane (MTA) / ethyl triacetoxysilane (MTA) to a solution of 47dp silanol terminated PhMe siloxane (55.0g, 0.403mol Si) dissolved in tolu...

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Abstract

Curable compositions of "resin-linear" organosiloxane block copolymers comprising a superbase catalyst are disclosed. The addition of a superbase catalyst to compositions of certain resin-linear organosiloxane block copolymers results in curable compositions having faster cure rates, and improved mechanical strength and / or thermal stability over similar compositions without the superbase catalyst

Description

[0001] Cross references to related patent applications [0002] This patent application claims the benefit of US Provisional Patent Application Serial No. 61 / 570,477, filed December 14, 2011, the entire disclosure of which is hereby incorporated by reference as if fully set forth herein. Background technique [0003] Light-emitting diodes (LEDs) and solar panels use encapsulation coatings to protect photovoltaic cells from environmental elements. This protective coating must be optically transparent to ensure maximum efficiency of these devices. Additionally, these protective coatings must be tough, durable, long-lasting, and easy to apply. However, many currently available coatings lack toughness, are not durable, are not durable, and / or are not easy to apply. Accordingly, there is a continuing need to identify protective and / or functional coatings in many emerging technical fields. Contents of the invention [0004] The inventors have discovered curable compositions of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/10C08L83/10C08G77/44
CPCH01L23/296C09D183/10C08G77/44C08L83/10H01L2924/0002H01L2924/00
Inventor S·斯维尔
Owner DOW SILICONES CORP
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