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Moisture-curing organopolysiloxane compositions

A kind of composition, polymer technology, applied in the field of curable composition

Inactive Publication Date: 2015-08-12
MOMENTIVE PERFORMANCE MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem that must be addressed in the replacement of organotin compounds is the property of the reaction composition to retain its curing ability after storage in a sealed sleeve when exposed to moisture or ambient atmosphere

Method used

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  • Moisture-curing organopolysiloxane compositions
  • Moisture-curing organopolysiloxane compositions
  • Moisture-curing organopolysiloxane compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0139] For example, according to a mixture of composition (a), 22.5 g of silanol-terminated polydimethylsiloxane polymer (silanol, 30,000 cps at 25° C.) as component (A) and 2.5 g as component (B) Methyltrimethoxysilane (MTMS) was prepared by mixing, in which component (A) and component (B) placed in a plastic cup were thoroughly mixed for 1 min by using a Hauschild mixer. The respective manganese compounds as component (C) dissolved in an appropriate solvent are added to the mixture. The resulting mixture was then mixed in a Hauschild mixer for 1 min. The mixed preparation was poured into a polytetrafluoroethylene mold (length×width×depth ~ 10cm×10cm×1cm) placed in a fume hood. Surface cure (Tack Dry Time TFT) and body cure as a function of time (maximum 7 days) are monitored.

[0140] Processes used to prepare typical formulations (a) to (f):

[0141] Six typical formulations were made by mixing the various ingredients (in portions) given in Table 1 below.

[0142] Table 1

[0...

Embodiment 9

[0173] Compared with the Mn(II)AA of Example 5, the Mn(III)AA of Example 9 showed shorter TFT and shorter complete curing time, and it was found to be effective among the different manganese composites screened. One of the catalysts. Mn(III)AA was evaluated in selected typical formulations. ((a)(b), (c), (d), (e) and (f) formulation details are shown in Table 1 above). Table 3 below summarizes the results.

[0174] table 3

[0175]

[0176]

[0177] * There is some uncured at the bottom

[0178] ** viscosity

[0179] #2.5mm thick

[0180] 3 1cm thick

[0181] 4 Uncured

[0182] Comparative Examples C1-C2 describe the evaluation of formulations (a) with DBTDL and Examples 9-10 describe the evaluation of Mn(III)AA. The formulation containing DBTDL had a TFT of 14 minutes, while the formulation containing Mn(III)AA had a TFT of 2 minutes. The bulk curing characteristics of the formulations containing DBTDL and Mn(III)AA were found to be comparable.

[0183] Comparative Examples C3-C4 an...

Embodiment 23

[0190] Example 23 was prepared using the procedure of Comparative Example C14, except that manganese (III) acetylacetonate was used as the catalyst component (C) instead of the DBTL catalyst compound of Comparative Example C14.

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Abstract

The present invention provides curable compositions comprising non-Sn organo-metal catalysts that accelerate the condensation curing of moisture curable silicones / non-silicones. In particular, the present invention provides Mn(III) complexes that are particularly suitable as replacements for organotin for sealant and RTV formulations. The Mn(III) complexes are comparable or superior to organotin such as DBTDL, superior to Mn(II) compounds, and exhibit certain behavior in the presence of components that allow for tuning or adjusting the cure characteristics of the present compositions and provide good adhesion and storage stability.

Description

[0001] Cross references to related applications [0002] This application claims the rights of the U.S. Provisional Patent Application No. 61 / 380,849, titled "Moisture Curing Organopolysiloxane Composition", filed on September 8, 2010, which is hereby incorporated by reference in its entirety Incorporated into this article. Technical field [0003] The present invention relates to a curable composition comprising a curable polymer having a reactive terminal silyl group and a manganese-based catalyst. In particular, the present invention provides a curable composition containing a Mn(III)-based composite as an alternative to an organotin catalyst. Background technique [0004] A polymer having a reactive terminal silyl group or a composition containing the polymer can be hydrolyzed and condensed in the presence of water and an organometallic catalyst. Suitable known catalysts for curable compositions include organometallic compounds using metals such as Sn, Ti, Zn or Ca. Organotin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/04
CPCC08L83/04C08K5/5419C08K5/0091C08K5/49
Inventor 苏米·丁卡尔爱德华·J·内沙库马尔阿南塔拉曼·达纳巴兰沙希德·穆尔图扎谢恩·J·兰登
Owner MOMENTIVE PERFORMANCE MATERIALS INC