Patent US4388449A successfully refreshed from Google Patents.
US4388449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone resin
Assignee: Raychem Ltd
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Filing: 1981-12-16
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Granted: 1983-06-14
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Expires: 2001-12-16
Abstract
Abstract The invention relates to a novel thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO1.5 and R1R2R3SiO0.5 wherein R,R1,R2 and R3 are hydrogen, or organic groups which may be the same or different, at least 85% of the R groups in the RSiO1.5 being organic groups, and at least two of the groups R1, R2 and R3 in each R1R2R3SiO0.5 unit being organic groups, and in which the ratio RSiO1.5 units to R1R2R3SiO0.5 units is from 1:0.005 to 1:0.03 on a molar basis. Such resins are useful as electrical insulation material and as hold out agents for heat recoverable materials.
Inventors
- 👤 Jean-Claude Bonnet
- 👤 Kenneth B. Pithouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:42
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
163 words
A melt processable thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane contains Si--OH groups, the percentage by weight of said hydroxyl groups, based on the weight of the resin, being less than 2% and which has a number average molecular weight in the range of from 2,000-6,000, as measured by vapor phase osmometry.
Claim 2
Dependent Claim
163 words
A melt processable thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane contains Si--OH groups, the percentage by weight of said hydroxyl groups, based on the weight of the resin, being less than 2% and which has a number average molecular weight in the range of from 2,000-6,000, as measured by vapor phase osmometry.
Claim 3
Dependent Claim
19 words
The polysiloxane resin of claim 1, having a softening point in excess of 50° C., measured by thermomechanical analysis.
Claim 4
Dependent Claim
18 words
The polysiloxane resin of claim 1, in which R is a hydrocarbon group or a substituted hydrocarbon group.
Claim 5
Dependent Claim
15 words
The polysiloxane resin of claim 3, in which R is a methyl or phenyl group.
Claim 6
Dependent Claim
22 words
The polysiloxane resin of claim 1, in which R 1 , R 2 and R 3 are substituted or unsubstituted hydrocarbon groups.
Claim 7
Dependent Claim
24 words
The polysiloxane resin of claim 5, in which R 1 , R 2 and R 3 are independently each a methyl or phenyl group.
Claim 8
Dependent Claim
24 words
The polysiloxane resin of claim 1, in which up to 80% of the groups R are phenyl groups, with the remainder being methyl groups.
Claim 9
Dependent Claim
24 words
The polysiloxane resin of claim 7, in which the ratio of methyl to phenyl groups on a molar basis is from 1:4 to 4:1.
Claim 10
Dependent Claim
22 words
The polysiloxane resin of claim 1, which includes a minor amount of an olefinically unsaturated substituent group capable of undergoing crosslinking reactions.
Claim 11
Dependent Claim
18 words
The polysiloxane resin of claim 9, in which the substituent group comprises a vinyl or an allyl group.
Claim 12
Dependent Claim
21 words
The polysiloxane resin according to claim 9, in which the substituent is present in a molar amount of up to 5%.
Claim 13
Dependent Claim
9 words
The polysiloxane resin of claim 1, in cross-linked form.
Claim 14
Dependent Claim
27 words
A blend of polymers comprising, as one constituent, the polysiloxane resin of claim 1 and wherein the polysiloxane resin is selected from a non-crosslinked or crosslinked form.
Claim 15
Dependent Claim
15 words
The polymeric blend of claim 13 which also comprises as another constituent a silicone elastomer.
Claim 16
Dependent Claim
21 words
Electrical insulation comprising the polysiloxane resin of claim 1 wherein the polysiloxane resin is selected from a non-crosslinked or crosslinked form.
Claim 17
Dependent Claim
170 words
An article capable of being rendered heat recoverable comprising a melt processable thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane comprises Si--OH groups, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being less than 2% and which has, a number average molecular weight in the range 2,000-6,000 as measured by vapor phase osmometry.
Claim 18
Dependent Claim
170 words
An article capable of being rendered heat recoverable comprising a melt processable thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane comprises Si--OH groups, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being less than 2% and which has, a number average molecular weight in the range 2,000-6,000 as measured by vapor phase osmometry.
Claim 19
Dependent Claim
12 words
The article according to claim 16 in which the resin is crosslinked.
Claim 20
Dependent Claim
12 words
The article according to claim 17 in which the resin is uncrosslinked.
Claim 21
Dependent Claim
11 words
The article of claim 16 which has been rendered heat recoverable.
Claim 22
Dependent Claim
10 words
The article of claim 19 which has been heat recovered.
Claim 23
Dependent Claim
182 words
An article which is capable of being rendered heat recoverable comprising a blend of polymers of which a constituent is a melt processable thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each of R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane comprises Si--OH groups, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being less than 2% and which has, a number average molecular weight in the range 2,000-6,000, as measured by vapor phase osmometry.
Claim 24
Dependent Claim
182 words
An article which is capable of being rendered heat recoverable comprising a blend of polymers of which a constituent is a melt processable thermoplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each of R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane comprises Si--OH groups, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being less than 2% and which has, a number average molecular weight in the range 2,000-6,000, as measured by vapor phase osmometry.
Claim 25
Dependent Claim
11 words
The article of claim 21 in which the polymers are crosslinked.
Claim 26
Dependent Claim
11 words
The article of claim 21 in which the polymers are uncrosslinked.
Claim 27
Dependent Claim
11 words
The article of claim 21 which has been rendered heat recoverable.
Claim 28
Dependent Claim
10 words
The article of claim 24 which has been heat recovered.
Claim 29
Dependent Claim
174 words
Electrical insulation which comprises a blend of polymers of which a constituent is a melt processable theromplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane comprises Si--OH groups, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being less than 2% and which has, a number average molecular weight in the range 2,000-6,000 as measured by vapor phase osmometry.
Claim 30
Dependent Claim
174 words
Electrical insulation which comprises a blend of polymers of which a constituent is a melt processable theromplastic monoorganopolysiloxane resin comprising units of the formula RSiO 1 .5 and R 1 R 2 R 3 SiO 0 .5 wherein each of R, R 1 , R 2 and R 3 is independently hydrogen, or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, and at least two of the groups R 1 , R 2 and R 3 in each R 1 R 2 R 3 SiO 0 .5 unit being organic groups, and in which the molar ratio of RSiO 1 .5 units to R 1 R 2 R 3 SiO 0 .5 units is from 1:0.005 to 1:0.03 respectively, and wherein the organopolysiloxane comprises Si--OH groups, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being less than 2% and which has, a number average molecular weight in the range 2,000-6,000 as measured by vapor phase osmometry.
Claim 31
Dependent Claim
11 words
The insulation of claim 26 in which the polymers are crosslinked.
Claim 32
Dependent Claim
11 words
The insulation of claim 26 in which the polymers are uncrosslinked.
References Cited (Backward Citations)
US3318844A
Cited
US3489782A
Cited
US3634321A
Cited
US3929704A
Cited
US3832420A
Cited
GB1409517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |