US3853805A
Expired / Lapsed
US
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Silicone elastomeric material
Assignee: Boeing North American Inc
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Filing: 1972-11-10
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Granted: 1974-12-10
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Expires: 1992-11-10
Abstract
Abstract Silicone elastomer materials particularly adapted for use as a matrix in acoustical coupling systems for coupling the sound from an acoustical transducer to the test object in ultrasonic nondestructive testing for flaws and discontinuities in a test object, and also having general utility for elastic airtight seals between metal or other surfaces, comprising the cured product of a mixture of three siloxane, preferably dimethyl siloxane, polymers having varying molecular weights, one of such polymers being a silicone elastomer having a molecular weight range of about 6,000 to about 10,000, a second siloxane polymer being in the form of a gel and having a molecular weigh ranging from about 170,000 to about 300,000, and a third component being a nonreactive siloxane polymer oil having a molecular weight ranging from about 1,500 to about 5,000, and which composition can optionally include a silica filler, such as fumed silica. The cured elastomer while being strong and tough, is soft and compliant and also readily wets the surface of the substrate, so that such elastomer readily conforms and adheres to rough as well as smooth surfaces, eliminating voids and air pockets, and is applicable to such surface with a minimum of external pressure to provide an airtight seal, and also being removable using a minimum of force.
Inventors
- 👤 D Miller
- 👤 D Kaelble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:07
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/70
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
210 words
A STRONG, HIGHLY FLEXIBLE AND COMPLIANT CURED SILICONE ELASTOMER HAVING WETTABILITY CHARACTERISTICS WITH RESPECT TO THE SURFACE OF A SUBSTRATE, COMPRISING A CURED MIXTURE OF (A) A FIRST SILOXANE POLYMER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF A CURABLE DIMETHYL POLYSILOXANE AND A CURABLE METHYL PHENYL POLYSILOXANE HAVING A RATIO OF METHYL TO PHENYL GROUPS OF AT LEAST 8:1, SAID FIRST SILOXANE POLYMER HAVING A MOLECULAR WEIGHT RANGING FROM ABOUT 6,000 TO ABOUT 10,000, (B) A SECOND SILOXANE POLYMER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF A CURABLE DIMETHYL POLYSILOXANE AND A CURABLE METHYL PHENYL POLYSILOXANE HAVING A RATIO OF METHYL TO PHENYL GROUPS OF AT LEAST 8:1, SAID SECOND SILOXANE POLYMER HAVING A MOLECULAR WEIGHT RANGING FROM ABOUT 170,000 TO ABOUT 300,000, AND 8C) ATHIRD SILOXANE POLYMER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF A NONREACTIVE LINEAR DIMETHYL POLYSILOXANE AND A NONREACTIVE LINEAR METHYL PHENYL POLYSILOXAND HAVING A RATIO OF METHYL TO PHENYL GROUPS OF AT LEAST 8:1, SAID THIRD SILOXANE POLYMER HAVING A MOLECULAR WEIGHT RANGING FROM ABOUT 1,500 TO ABOUT 5,000; SAID MIXTURE CONTAINING ABOUT 30 TO ABOUT 60% OF SAID FIRST SILOXANE POLYMER, ABOUT 30 TO ABOUT 60% OF SAID SECOND SILOXANE POLYMER AND ABOUT 4 TO ABOUT 20% OF SAID THIRD SILOXANE POLYMER, BY WEIGHT.
Claim 2
Dependent Claim
210 words
A STRONG, HIGHLY FLEXIBLE AND COMPLIANT CURED SILICONE ELASTOMER HAVING WETTABILITY CHARACTERISTICS WITH RESPECT TO THE SURFACE OF A SUBSTRATE, COMPRISING A CURED MIXTURE OF (A) A FIRST SILOXANE POLYMER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF A CURABLE DIMETHYL POLYSILOXANE AND A CURABLE METHYL PHENYL POLYSILOXANE HAVING A RATIO OF METHYL TO PHENYL GROUPS OF AT LEAST 8:1, SAID FIRST SILOXANE POLYMER HAVING A MOLECULAR WEIGHT RANGING FROM ABOUT 6,000 TO ABOUT 10,000, (B) A SECOND SILOXANE POLYMER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF A CURABLE DIMETHYL POLYSILOXANE AND A CURABLE METHYL PHENYL POLYSILOXANE HAVING A RATIO OF METHYL TO PHENYL GROUPS OF AT LEAST 8:1, SAID SECOND SILOXANE POLYMER HAVING A MOLECULAR WEIGHT RANGING FROM ABOUT 170,000 TO ABOUT 300,000, AND 8C) ATHIRD SILOXANE POLYMER SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF A NONREACTIVE LINEAR DIMETHYL POLYSILOXANE AND A NONREACTIVE LINEAR METHYL PHENYL POLYSILOXAND HAVING A RATIO OF METHYL TO PHENYL GROUPS OF AT LEAST 8:1, SAID THIRD SILOXANE POLYMER HAVING A MOLECULAR WEIGHT RANGING FROM ABOUT 1,500 TO ABOUT 5,000; SAID MIXTURE CONTAINING ABOUT 30 TO ABOUT 60% OF SAID FIRST SILOXANE POLYMER, ABOUT 30 TO ABOUT 60% OF SAID SECOND SILOXANE POLYMER AND ABOUT 4 TO ABOUT 20% OF SAID THIRD SILOXANE POLYMER, BY WEIGHT.
Claim 3
Dependent Claim
56 words
A cured silicone elastomer as defined in claim 1, said first siloxane polymer having a molecular weight ranging from about 7, 000 to about 8,500, said second siloxane polymer having a molecular weight ranging from about 200,000 to about 250,000, and said third siloxane polymer having a molecular weight ranging from about 1,800 to about 3,000.
Claim 4
Dependent Claim
22 words
A cured silicone elastomer as defined in claim 1, each of said first, second and third siloxane polymers being a dimethyl polysiloxane.
Claim 5
Dependent Claim
22 words
A cured silicone elastomer as defined in claim 2, each of said first, second and third siloxane polymers being a dimethyl polysiloxane.
Claim 6
Dependent Claim
25 words
A cured silicone elastomer as defined in claim 1, said mixture containing about 5 to about 15 percent of said third siloxane polymer, by weight.
Claim 7
Dependent Claim
25 words
A cured silicone elastomer As defined in claim 4, said mixture containing about 5 to about 15 percent of said third siloxane polymer, by weight.
Claim 8
Dependent Claim
14 words
A cured silicone elastomer as defined in claim 1, said mixture including powdered silica.
Claim 9
Dependent Claim
22 words
A cured silicone elastomer as defined in claim 1, said mixture including about 0.5 to about 5 percent powdered silica, by weight.
Claim 10
Dependent Claim
22 words
A cured silicone elastomer as defined in claim 7, each of said first, second and third siloxane polymers being a dimethyl polysiloxane.
Claim 11
Dependent Claim
22 words
A cured silicone elastomer as defined in claim 6, said mixture including about 0.2 to about 3 percent fumed silica, by weight.
Claim 12
Dependent Claim
89 words
A cured silicone elastomer as defined in claim 1, each of said first, second and third siloxane polymers being a dimethyl polysiloxane, said first siloxane polymer having an average molecular weight of about 7,700, said second siloxane polymer having an average molecular weight of about 230,000, and said third siloxane polymer having an average molecular weight of about 2,500, and being present in an amount ranging from about 5 to about 15 percent, by weight, said mixture including about 0.2 to about 3 percent of powdered silica, by weight.
Claim 13
Dependent Claim
68 words
A cured silicone elastomer as defined in claim 11, said first siloxane polymer being present in an amount ranging from about 40 to about 45 percent, said second siloxane polymer being present in an amount ranging from about 40 to about 45 percent, said first, second and third siloxane polymers containing about 1.9 to about 2.05 hydrocarbon radicals per silicon atom, and said powdered silica being fumed silica.
Claim 14
Dependent Claim
211 words
A curable composition for producing a strong, highly flexible and compliant cured silicone elastomer having wettability characteristics with respect to the surface of a substrate, comprising, by weight, (a) about 30 to about 60 percent of a first siloxane polymer selected from the group consisting essentially of a curable dimethyl polysiloxane and a curable methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said first siloxane polymer having a molecular weight ranging from about 6,000 to about 10,000, (b) about 30 to about 60 percent of a second siloxane polymer in the form of a gel, selected from the group consisting essentially of a curable dimethyl polysiloxane and a curable methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said second siloxane polymer having a molecular weight ranging from about 170,000 to about 300,000, and (c) about 4 to about 20 percent of a third siloxane polymer in the form of an oil, selected from the group consisting essentially of a nonreactive linear dimethyl polysiloxane and a nonreactive linear methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said third siloxane polymer having a molecular weight ranging from about 1,500 to about 5,000.
Claim 15
Dependent Claim
211 words
A curable composition for producing a strong, highly flexible and compliant cured silicone elastomer having wettability characteristics with respect to the surface of a substrate, comprising, by weight, (a) about 30 to about 60 percent of a first siloxane polymer selected from the group consisting essentially of a curable dimethyl polysiloxane and a curable methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said first siloxane polymer having a molecular weight ranging from about 6,000 to about 10,000, (b) about 30 to about 60 percent of a second siloxane polymer in the form of a gel, selected from the group consisting essentially of a curable dimethyl polysiloxane and a curable methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said second siloxane polymer having a molecular weight ranging from about 170,000 to about 300,000, and (c) about 4 to about 20 percent of a third siloxane polymer in the form of an oil, selected from the group consisting essentially of a nonreactive linear dimethyl polysiloxane and a nonreactive linear methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said third siloxane polymer having a molecular weight ranging from about 1,500 to about 5,000.
Claim 16
Dependent Claim
21 words
A curable composition as defined in claim 13, said composition including about 0.1 to about 5 percent powdered silica, by weight.
Claim 17
Dependent Claim
28 words
A curable composition as defined in claim 13, said composition including a curing agent for said first and second siloxane polymers, and a catalyst for said curing reaction.
Claim 18
Dependent Claim
58 words
A composition as defined in claim 15, each of said first, second and third siloxane polymers being a dimethyl polysiloxane, and employing about 5 to about 15 percent of said curing agent and about 5 to about 15 percent of said catalyst, by weight, based on the total weight of said first and said second curable siloxane polymers.
Claim 19
Dependent Claim
20 words
A composition as defined in claim 15, said composition including about 0.1 to about 5 percent powdered silica, by weight.
Claim 20
Dependent Claim
20 words
A composition as defined in claim 16, said composition containing about 0.2 to about 3 percenT fumed silica, by weight.
Claim 21
Dependent Claim
43 words
A composition as defined in claim 16, said curing agent being selected from the group consisting essentially of ethyl silicate, ethyl polysilicate and methyl triethoxy silane, and said catalyst being selected from the group consisting essentially of stannous octoate and dibutyl tin dilaurate.
Claim 22
Dependent Claim
43 words
A composition as defined in claim 17, said curing agent being selected from the group consisting essentially of ethyl silicate, ethyl polysilicate and methyl triethoxy silane, and said catalyst being selected from the group consisting essentially of stannous octoate and dibutyl tin dilaurate.
Claim 23
Dependent Claim
186 words
A composition as defined in claim 13, each of said first, second and third siloxane polymers being a dimethyl polysiloxane, said first siloxane polymer having an average molecular weight of about 7,700, and being present in an amount ranging from about 40 to about 45 percent, by weight, said second siloxane polymer having an average molecular weight of about 230,000, and being present in an amount ranging from about 40 to about 45 percent, by weight, and said third siloxane polymer having an average molecular weight of about 2,500, and being present in an amount ranging from about 5 to about 15 percent, by weight, and about 5 to about 15 percent by weight, based on the total weight of said first and said second curable siloxane polymers, of a curing agent selected from the group consisting essentially of ethyl silicate, ethyl polysilicate and methyl triethoxy silane, and about 5 to about 15 percent by weight, based on the total weight of said first and said second curable siloxane polymers, of a catalyst selected from the group consisting essentially of stannous octoate and dibutyl tin dilaurate.
Claim 24
Dependent Claim
49 words
A composition as defined in claim 21, said second siloxane polymer being present in an amount ranging from about 40 to about 45 percent, said first, second and third siloxane polymers containing about 1.9 to about 2.05 hydrocarbon radicals per silicon atom, and said powdered silica being fumed silica.
Claim 25
Dependent Claim
217 words
A strong, highly flexible and compliant cured silicone elastomer having wettability characteristics with respect to the surface of a substrate, comprising (a) a cured first siloxane polymer selected from the group consisting essentially of a dimethyl polysiloxane and a methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said first siloxane polymer having a molecular weight ranging from about 6, 000 to about 10,000 between chemical cross links, (b) a cured second siloxane polymer selected from the group consisting essentially of a dimethyl polysiloxane and a methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said second siloxane polymer having a molecular weight ranging from about 170,000 to about 300,000 between chemical cross links, and (c) a third siloxane polymer selected from the group consisting essentially of a nonreactive linear dimethyl polysiloxane and a nonreactive linear methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said third siloxane polymer having a molecular weight ranging from about 1,500 to about 5,000; said elastomer containing about 30 to about 60 percent of said first siloxane polymer, about 30 to about 60 percent of said second siloxane polymer and about 4 to about 20 percent of said third siloxane polymer, by weight.
Claim 26
Dependent Claim
217 words
A strong, highly flexible and compliant cured silicone elastomer having wettability characteristics with respect to the surface of a substrate, comprising (a) a cured first siloxane polymer selected from the group consisting essentially of a dimethyl polysiloxane and a methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said first siloxane polymer having a molecular weight ranging from about 6, 000 to about 10,000 between chemical cross links, (b) a cured second siloxane polymer selected from the group consisting essentially of a dimethyl polysiloxane and a methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said second siloxane polymer having a molecular weight ranging from about 170,000 to about 300,000 between chemical cross links, and (c) a third siloxane polymer selected from the group consisting essentially of a nonreactive linear dimethyl polysiloxane and a nonreactive linear methyl phenyl polysiloxane having a ratio of methyl to phenyl groups of at least 8:1, said third siloxane polymer having a molecular weight ranging from about 1,500 to about 5,000; said elastomer containing about 30 to about 60 percent of said first siloxane polymer, about 30 to about 60 percent of said second siloxane polymer and about 4 to about 20 percent of said third siloxane polymer, by weight.
Claim 27
Dependent Claim
19 words
A cured silicone elastomer as defined in claim 23, including silica particles substantially uniformly dispersed in said cured elastomer.
Claim 28
Dependent Claim
22 words
A cured silicone elastomer as defined in claim 23, each of said first, second and third siloxane polymers being a dimethyl polysiloxane.
Claim 29
Dependent Claim
29 words
A cured silicone elastomer as defined in claim 23, including about 0.5 to about 5 percent by weight of powdered siliCa particles substantially uniformly dispersed in said cured elastomer.
Claim 30
Dependent Claim
25 words
A cured silicone elastomer as defined in claim 23, said elastomer containing about 5 to about 15 percent of said third siloxane polymer, by weight.
Claim 31
Dependent Claim
25 words
A cured silicone elastomer as defined in claim 25, said elastomer containing about 5 to about 15 percent of said third siloxane polymer, by weight.
Claim 32
Dependent Claim
22 words
A cured silicone elastomer as defined in claim 28, said elastomer including about 0.2 to about 3 percent fumed silica, by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |