Title:
FIRE RESISTANT SEALANT COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2000/046302
Kind Code:
A2
Abstract:
Curable liquid silicone rubber compositions that are curable to form silicone elastomers which are useable as fire resistant sealants. These compositions have low heat release and form hard chars on burning, and comprise: (A) a liquid polyorganosiloxane polymer described by formula (I) where each R?1¿ is independently selected from the group consisting of alkyl, alkenyl, aryl, and halogenated alkyl groups having from 1 to 18 carbon atoms, each R?2¿ is independently selected from the group consisting of hydroxyl, alkoxy, alkenyl, and alkynyl groups, and $i(x) is an integer having a value of from about 10 to 1500, (B) a cross-linking organosilicon compound having at least 3 silicon-bonded reactive groups, (C) a catalyst capable of promoting the reaction between the silicon-bonded R?2¿ groups of Component A and the silicon-bonded reactive group of Component B, (D) wollastonite, and (E) an optional reinforcing filler.
Inventors:
ALVAREZ KHRISTOPHER E
SHEPHARD KIERSTEN L
SHEPHARD KIERSTEN L
Application Number:
PCT/US2000/002471
Publication Date:
August 10, 2000
Filing Date:
January 31, 2000
Export Citation:
Assignee:
DOW CORNING (US)
International Classes:
C08K3/16; C09K3/10; C08K3/28; C08K3/34; C08K5/057; C08K5/07; C08K5/54; C08K5/56; C08L83/04; C09D183/04; (IPC1-7): C08L83/04
Foreign References:
| US2823218A | 1958-02-11 | |||
| US3419593A | 1968-12-31 | |||
| US3445420A | 1969-05-20 |
Other References:
CHEMICAL ABSTRACTS, vol. 130, no. 18, 3 May 1999 (1999-05-03) Columbus, Ohio, US; abstract no. 238597, HU, DONGHONG ET AL: "Crosslink density of mineral/silicone rubber composite material" XP002142676 & HUAQIAO DAXUE XUEBAO, ZIRAN KEXUEBAN (1998), 19(4), 375-379 ,1998,
CHEMICAL ABSTRACTS, vol. 129, no. 23, 7 December 1998 (1998-12-07) Columbus, Ohio, US; abstract no. 303564, HU, DONGHONG ET AL: "Study on the bound rubber formed by filling silicone rubber with minerals" XP002142677 & HUAQIAO DAXUE XUEBAO, ZIRAN KEXUEBAN (1998), 19(3), 270-274 ,1998,
DATABASE WPI Section Ch, Week 199718 Derwent Publications Ltd., London, GB; Class A18, AN 1997-199290 XP002142678 & JP 09 055125 A (FUJIKURA LTD), 25 February 1997 (1997-02-25)
CHEMICAL ABSTRACTS, vol. 129, no. 23, 7 December 1998 (1998-12-07) Columbus, Ohio, US; abstract no. 303564, HU, DONGHONG ET AL: "Study on the bound rubber formed by filling silicone rubber with minerals" XP002142677 & HUAQIAO DAXUE XUEBAO, ZIRAN KEXUEBAN (1998), 19(3), 270-274 ,1998,
DATABASE WPI Section Ch, Week 199718 Derwent Publications Ltd., London, GB; Class A18, AN 1997-199290 XP002142678 & JP 09 055125 A (FUJIKURA LTD), 25 February 1997 (1997-02-25)
Attorney, Agent or Firm:
Boley, William F. (MI, US)
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Claims:
Claims:
| 1. | A curable liquid silicone rubber composition comprising (A) a liquid polyorganosiloxane polymer described by the formula where each R'is independently selected from the group consisting of alkyl, alkenyl, aryl, and halogenated alkyl groups having from 1 to 18 carbon atoms, each R2 is independently selected from the group consisting of hydroxyl, alkoxy, alkenyl, and alkynyl groups, and x is an integer having a value of from about 10 to 1500, (B) a crosslinking organosilicon compound having at least 3 siliconbonded reactive groups, (C) a catalyst capable of promoting the reaction between the siliconbonded R' groups of Component A and the siliconbonded reactive group of Component B, (D) wollastonite. |
| 2. | The composition of Claim 1, where at least 50% of all R'groups are methyl groups,. |
| 3. | The composition of Claim 1, where each R2 is independently selected from the group consisting of vinyl, allyl, and hexenyl groups. |
| 4. | The composition of Claim 1, where Component (A) comprises an a, (odimethylvinylsiloxy polydimethylsiloxane polymer having a viscosity of from about 50 to 250,000 mPas at 25°C. |
| 5. | The composition of Claim 1, where each R2 is independently selected from the group consisting of hydroxy groups and alkoxy groups. |
| 6. | The composition of Claim 1, where Component (A) comprises an a, cohydroxy endterminated polydimethylsiloxane polymer having a viscosity of from 50 to 250,000 mPasat25°C. |
| 7. | The composition of Claim 1, where Component (B) comprises at least one unit of the general formula RRSIO. ;, . . an alkyl or aryl group having from 1 to about 8 carbon atoms, a has a value of 0 or 1, b has a value of from 2 to 3, the sum of a + b being no more than 3, and R5 is selected from the group consisting of a hydrogen atom, a hydroxyl and an alkoxy group. |
| 8. | The composition of Claim 7 where R5 is selected from the group consisting of a hydroxyl and an alkoxy group. |
| 9. | The composition of Claim 7 where R5 is a hydrogen atom. |
| 10. | The composition of Claim 1 where (B) is selected from the group consisting of methyltrimethoxysilane, ethyltrimethoxysilane, and methyltriethoxysilane. |
| 11. | The composition of Claim 1 where (B) is a short chain polyorganosiloxane having at least 3 siliconbonded reactive group per molecule selected from the group consisting of a hydrogen, hydroxyl and alkoxy group. |
| 12. | The composition of Claiml where (B) is selected from the group consisting of compounds described by and (HSiO) 3SiR6, where R6 denotes an alkyl or aryl group having up to about 10 carbon atoms, R7 is a group R6 or a hydrogen atom, p has a value of from 0 to about 20, q has a value of from 1 to about 70, and there are at least 3 siliconbonded hydrogen atoms present per molecule. |
| 13. | The composition of Claim 1 where Component (C) is a condensation catalyst selected from the group consisting of tin compounds and titanium compounds. |
| 14. | The composition of Claim 13 where Component (C) is selected from the group consisting of dialkyltin dicarboxylic acids and tetralkyl titanates. |
| 15. | The composition of Claim 1 where Component (C) a platinum group metal based catalyst. |
| 16. | The composition of Claim 15 where Component (C) is selected from the group consisting of chloroplatinic acid, platinum acetylacetonate, complexes of platinous halides with unsaturated compounds, hexamethyldiplatinum, PtCl2, PtCl3, PtCl4, and Pt (CN) 3. |
| 17. | The composition of Claim 16 where Component (C) is added in an amount giving from 2 to 100 ppm by weight of platinum metal based on the total weight of the composition. |
| 18. | The composition of Claim 1 where Component (D) has an aspect ratio of at least 3: 1. |
| 19. | The composition of Claim 1 where Component (D) has a number average particle size of about 5 to 15 um and an aspect ratio greater than about 15: 1. |
| 20. | The composition of Claim 1 where Component (D) comprises 7 to 70 weight percent of the total composition. |
| 21. | The composition of Claim 1 further comprising (E) is about 10 to 60 weight percent reinforcing filler. |
| 22. | The composition of Claim 21 where Component (E) comprises a hydrophobic silica, added at from about 10 to about 25 weight percent, based on the total composition. |
| 23. | The composition of Claim 21 where Component (E) comprises a silicone resin. |
| 24. | The composition of Claim 23 where the silicone resins consists essentially of M units R2R'2SiO"2 and Rí3SiO"2 and Q units SiO"where each R'is independently selected from the group consisting of alkyl, alkenyl, aryl, and halogenated alkyl groups having from 1 to 18 carbon atoms, each R2 is independently selected from the group consisting of hydroxyl, alkoxy, alkenyl, and alkynyl groups. |
| 25. | A flame resistant seal formed by curing a liquid silicone rubber composition comprising (A) a liquid polyorganosiloxane polymer described by the formula where each R'is independently selected from the group consisting of alkyl, alkenyl, aryl, and halogenated alkyl groups having from 1 to 18 carbon atoms, each R2 is independently selected from the group consisting of hydroxyl, alkoxy, alkenyl, and alkynyl groups, and x is an integer having a value of from about 10 to 1500, (B) a crosslinking organosilicon compound having at least 3 siliconbonded reactive groups, (C) a catalyst capable of promoting the reaction between the siliconbonded R2 groups of Component A and the siliconbonded reactive group of Component B, and (D) wollastonite. |
| 26. | The seal of Claim 24, further comprising from 10 to 60 weight percent of a reinforcing filler. |
Description:
INTERNATIONALSEARCHREPORT Interooinal AppilcatlonNo PCT/US00/02471 C.(Continuation)DOCUMENTSCONSIDEREDTOBERELEVANT _ _ _ __ Category° Citabonofdocument,withindication,whereappropriate,oftherelev
antpassagesRelevanttodaimNo. ACHEMICALABSTRACTS,vol.130,no.18,1-26 3May1999(1999-05-03) Columbus,Ohio,US; abstractno.238597, HU,DONGHONGETAL:"Crosslink densityof mineral/siliconerubbercomposite material" XP002142676 abstract &HUAQIAODAXUEXUEBAO,ZIRANKEXUEBAN (1998),19(4),375-379,1998, ACHEMICALABSTRACTS,vol.129,no.23,1-26 7December1998(1998-12-07) Columbus,Ohio,US; abstractno.303564, HU,DONGHONGETAL:"Study onthebound rubberformedbyfillingsiliconerubber withminerals" XP002142677 abstract &HUAQIAODAXUEXUEBAO,ZIRANKEXUEBAN (1998),19(3),270-274,1998, ADATABASEWPI1-26 SectionCh,Week199718 DerwentPublicationsLtd.,London,GB; ClassA18,AN1997-199290 XP002142678 &JP09055125A(FUJIKURALTD), 25February1997(1997-02-25) abstract P,AEP0902440A(GENELECTRIC)1-26 17March1999(1999-03-17) thewholedocument INTERNATIONALSEARCHREPORT Interr e nal AppiicationNo Informatlon on patent family members PCT/US00/02471 PatentdocumentPublicationPatentfamilyPublication citedinsearchreportdatemember(s)date DE3439745A15-05-1985NONE EP0739947A30-10-1996US5674937A07-10-1997 AU702290B18-02-1999 AU5083596A07-11-1996 CA2174700A28-10-1996 CN1134948A06-11-1996 JP8302023A19-11-1996 US5994459A30-11-1999 JP9055125A25-02-1997NONE EP0902440A17-03-1999US6051642A18-04-2000 JP11172107A29-06-1999