Patent US5162397A successfully refreshed from Google Patents.
US5162397A
Expired / Lapsed
US
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Silicone foams
Assignee: Dow Silicones Belgium SPRL
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Filing: 1992-03-11
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Granted: 1992-11-10
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Expires: 2012-03-11
Abstract
Abstract A foamable silicone composition comprises a polysiloxane having silicon-bonded hydrogen atoms, a polysiloxane having siloxane units including unsaturated groups, a polysiloxane having silicon-bonded hydroxyl groups, a noble metal catalyst and from 3 to 40 parts by weight per 100 parts by weight of the composition of entities of borosilicate or silicate glass or mixtures thereof. The composition comprises first and second Parts A and B having viscosities which are sufficiently similar to each other to permit facile machine mixing of the Parts; the first Part comprises the noble metal catalyst and a portion of the entities and the second Part comprises the polysiloxane having silicon-bonded hydrogen atoms and a portion of the entities pretreated with a compatible silane or a polysiloxane having silicon-bonded hydrogen atoms. Preferred entities comprise hollow spherical particles or hollow entities which have an irregular configuration. Preferably the entities of the first Part of the composition have been treated with a compatible silane. Preferred compatible silanes are vinyl silanes. The compositions are suitable for producing rigid fire resistant foamed articles resistant to compression and deflection and may be used in the production of building elements.
Inventors
- 👤 Pierre Descamps
- 👤 Andreas T. F. Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/02; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08G77/20; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
223 words
A foamable silicone composition comprising a polysiloxane having silicon-bonded hydrogen atoms, a polysiloxane having siloxane units including unsaturated groups, a polysiloxane having silicon-bonded hydroxyl groups, a noble metal catalyst and from 3 to 40 parts by weight per 100 parts by weight of the composition of entities of borosilicate or silicate glass or mixtures thereof, the composition comprising first and second Parts having viscosities which are sufficiently similar to each other to permit facile machine mixing of the Parts and the first Part comprising the noble metal catalyst and a portion of the entities and the second Part comprising the polysiloxane having silicon-bonded hydrogen atoms and a portion of the entities pretreated with a compatible silane or polysiloxane having silicon-bonded hydrogen atoms, wherein said entities comprise hollow spherical particles and are selected from those having a bulk density (as determined by ASTM D 3101-72) between about 0.07 and about 0.25 g/cm 3 , a particle density (as determined by ASTM D 2840-69) of between about 0.1 and about 0.6 g/cm 3 , a particle size gradation of about 5 to about 250 microns, an average particle diameter from about 30 to about 80 microns, a wall thickness from about 1 to about 2 microns and a pressure resistance (as measured according to ASTM D 3102-72) from about 60 Bar to about 150 Bar.
Claim 2
Dependent Claim
223 words
A foamable silicone composition comprising a polysiloxane having silicon-bonded hydrogen atoms, a polysiloxane having siloxane units including unsaturated groups, a polysiloxane having silicon-bonded hydroxyl groups, a noble metal catalyst and from 3 to 40 parts by weight per 100 parts by weight of the composition of entities of borosilicate or silicate glass or mixtures thereof, the composition comprising first and second Parts having viscosities which are sufficiently similar to each other to permit facile machine mixing of the Parts and the first Part comprising the noble metal catalyst and a portion of the entities and the second Part comprising the polysiloxane having silicon-bonded hydrogen atoms and a portion of the entities pretreated with a compatible silane or polysiloxane having silicon-bonded hydrogen atoms, wherein said entities comprise hollow spherical particles and are selected from those having a bulk density (as determined by ASTM D 3101-72) between about 0.07 and about 0.25 g/cm 3 , a particle density (as determined by ASTM D 2840-69) of between about 0.1 and about 0.6 g/cm 3 , a particle size gradation of about 5 to about 250 microns, an average particle diameter from about 30 to about 80 microns, a wall thickness from about 1 to about 2 microns and a pressure resistance (as measured according to ASTM D 3102-72) from about 60 Bar to about 150 Bar.
Claim 3
Dependent Claim
88 words
A composition according to claim 1 wherein the entities comprise hollow entities which have an irregular configuration selected from those having a bulk density (as determined by ASTM D 3101-72) between about 0.11 and about 0.18 g/cm 3 , a particle density (as determined by ASTM D 2840-69) between about 0.18 and about 0.30 g/cm 3 , a particle size gradation of about 5 to 300 microns, an average diameter from about 35 to about 75 microns and a wall thickness from about 0.5 to about 3 microns.
Claim 4
Dependent Claim
23 words
A composition according to claim 1 wherein the entities of the first Part of the composition have been treated with a compatible silane.
Claim 5
Dependent Claim
17 words
A composition according to claim 1 or claim 3 wherein the compatible silane is a vinyl silane.
Claim 6
Dependent Claim
60 words
A composition according to claim 1 wherein the polysiloxanes having silicon-bonded hydrogen atoms are polymers having units according to the general formula ##EQU8## with or without the presence of R 2 SiO units in which each R represents a methyl group, and p is 1 or 2, and having a viscosity of about 5 to about 50 mm 2 /s.
Claim 7
Dependent Claim
39 words
A composition according to claim 1 wherein the polysiloxane having siloxane units including unsaturated groups has not less than two silicon-bonded aliphatically unsaturated groups per molecule and has a viscosity in the range 100 to 2000 mm 2 /s.
Claim 8
Dependent Claim
47 words
A composition according to claim 1 wherein the polysiloxane having silicon-bonded hydroxyl groups comprises a silanol terminated polydioganosiloxane according to the general formula HO((R 2 )SiO) s H in which each R represents a methyl group and s has a value from about 10 to about 1200.
Claim 9
Dependent Claim
10 words
A composition according to claim 1 also comprising an alcohol.
Claim 10
Dependent Claim
54 words
A composition according to claim 1 wherein the proportions of the ingredients is such that the ratio of silicon-bonded hydrogen atoms of the polysiloxane (A) to all silicon-bonded hydroxyl groups and carbon-bonded hydroxyl groups together with other reactive hydroxyl, unsaturated and other groups present in the composition is in the range 1.0:1 to 35.0:1.
Claim 11
Dependent Claim
36 words
A composition according to claim 1 wherein the proportions of the ingredients is such that the ratio of silicon-bonded hydrogen atoms to carbon-bonded hydroxyl groups and silicon-bonded hydroxyl groups is in the range 2.0:1 to 40.0:1.
Claim 12
Dependent Claim
32 words
A composition according to claim 1 wherein the proportions of the ingredients is such that the ratio of aliphatically unsaturated groups to silicon-bonded hydrogen atoms is in the range 0:1 to 0.5:1.
Claim 13
Dependent Claim
40 words
A composition according to claim 1 wherein the proportions of the ingredients of the silicone composition is such that the ratio of aliphatically unsaturated groups to carbon-bonded hydroxyl groups and silicon-bonded hydroxyl groups is in the range 0:1 to 1:1.
Claim 14
Dependent Claim
13 words
An article formed by foaming and curing a composition according to claim 1.
Claim 15
Dependent Claim
21 words
An article according to claim 13 wherein after completion of the foaming the moulding is heated to effect a post cure.
Claim 16
Dependent Claim
12 words
An article according to claim 13 comprising an internal or external stiffener.
Claim 17
Dependent Claim
13 words
An article according to claim 13 in the form of a building element.
Claim 18
Dependent Claim
20 words
An article according to claim 16 comprising an exterior reinforcing or decorative layer of building board, stone, metal or glass.
Claim 19
Dependent Claim
12 words
An article according to claim 17 formed with integral lips or grooves.
References Cited (Backward Citations)
US4762859A
Cited
US5010115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |