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Curable perfluoropolyether compositions and rubber or gel articles comprising the same

a technology of perfluoropolyether and composition, applied in the field of perfluoropolyether composition, can solve the problems of short acid resistance, achieve the effects of improving acid resistance, good heat resistance, oil resistance, and solvent resistan

Inactive Publication Date: 2005-12-15
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] An object of the invention is to provide curable perfluoropolyether compositions which are cured into rubber or gel having exhibit good heat resistance, solvent resistance, chemical resistance, weatherability, water repellency and oil repellency and especially acid resistance. Another object is to provide rubber or gel articles comprising the same.
[0011] The perfluoropolyether compositions of the invention, when cured, impart rubber or gel products having good heat resistance, oil resistance, chemical resistance, solvent resistance, low-temperature properties, moisture resistance and low gas permeability, and especially improved acid resistance.

Problems solved by technology

However, their acid resistance is short in those applications requiring chemical resistance such as sealants in semiconductor manufacturing units, sealants and potting materials for use with engine oil, and sealants and potting materials for use in engine exhaust parts.

Method used

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  • Curable perfluoropolyether compositions and rubber or gel articles comprising the same
  • Curable perfluoropolyether compositions and rubber or gel articles comprising the same
  • Curable perfluoropolyether compositions and rubber or gel articles comprising the same

Examples

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Effect test

example 1

[0079] A composition was prepared by combining 100 pbw of a polymer having formula (10) (viscosity 5,600 cSt) with 1.5 pbw of fumed silica Aerosil R972 (Aerosil Co., Ltd.). There were further added 0.3 pbw of a 50% toluene solution of ethynyl cyclohexanol, 0.2 pbw of a toluene solution of chloroplatinic acid-vinylsiloxane complex (platinum metal concentration 0.5 wt %), and 3.3 pbw of a compound having formula (11), followed by mixing.

[0080] The composition was press molded at 150° C. for 10 minutes and post-cured at 150° C. for 50 minutes, forming a cured product, designated Rubber A. Physical properties of the cured product were measured according to JIS K6249. The results are shown in Table 1.

example 2

[0081] A composition was prepared by combining 100 pbw of a polymer having formula (12) (viscosity 7,500 cSt) with 4 pbw of Aerosil R976 (Aerosil Co., Ltd.). There were further added 0.3 pbw of a 50% toluene solution of ethynyl cyclohexanol, 0.2 pbw of a toluene solution of chloroplatinic acid-vinylsiloxane complex (platinum metal concentration 0.5 wt %), and 2.7 pbw of a compound having formula (13), followed by mixing.

[0082] The composition was press molded at 150° C. for 10 minutes and post-cured at 150° C. for 50 minutes, forming a cured product, designated Rubber B. Physical properties of the cured product were measured according to JIS K6249. The results are shown in Table 1.

example 3

[0093] A composition was prepared by combining 65 pbw of a polymer having formula (12) and 10 pbw of a polymer having formula (15) (viscosity 650 cSt) with 25 pbw of a polymer having formula (16), 0.15 pbw of a 50% toluene solution of ethynyl cyclohexanol, 0.015 pbw of an ethanol solution of chloroplatinic acid-vinylsiloxane complex (platinum metal concentration 3.0 wt %), and 14.2 pbw of a compound having formula (17), followed by mixing.

[0094] The composition was heated at 150° C. for one hour, forming a gel product, designated Gel A. The penetration of this gel was measured according to ASTM D-1403 using a ¼ cone. The results are shown in Table 2.

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Abstract

Perfluoropolyether compositions are provided comprising (A) a linear perfluoropolyether compound containing at least two alkenyl groups, having a perfluoropolyether structure comprising recurring units —CaF2aO— in its backbone, and having a Mw of 10,000-100,000; (B) an organosilicon compound containing at least two silicon atom-bonded hydrogen atoms; (C) a reinforcing filler; (D) a hydrosilylation catalyst; and (E) a polyfluoromonoalkenyl compound containing one alkenyl group and having a perfluoropolyether structure in its backbone. The compositions cure into rubber or gel products having improved acid resistance.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2004-174777 filed in Japan on Jun. 11, 2004, the entire contents of which are hereby incorporated by reference. FIELD OF THE INVENTION [0002] This invention relates to perfluoropolyether compositions which cure into rubber or gel products having heat resistance, oil resistance, chemical resistance, solvent resistance, low-temperature properties, moisture resistance, and low gas permeability and especially, improved acid resistance. The invention also relates to rubber or gel articles obtained by curing the compositions. BACKGROUND ART [0003] Japanese Patent No. 2,990,646 (JP-A 8-199070) discloses a curable composition comprising a linear perfluoropolyether compound containing at least two alkenyl groups per molecule and having a perfluoropolyether structure in its backbone, an organosilicon compound having at least two H—SiOSiO structures p...

Claims

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Application Information

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IPC IPC(8): C08G65/00C08K3/36C08K5/54C08L71/02
CPCC08K3/36C08K5/5406C08L71/02C08L83/00
Inventor FUKUDA, KENICHISHIONO, MIKIOKISHITA, HIROFUMI
Owner SHIN ETSU CHEM IND CO LTD
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