US4513132A
Expired / Lapsed
US
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Heat-resistant silicone block polymer
Assignee: Hitachi Ltd
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Filing: 1983-03-31
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Granted: 1985-04-23
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Expires: 2003-03-31
Abstract
Abstract Heat-resistant silicone block polymer with a good flexibility obtained by reaction of an organosilsesquioxane with a silicone compound or organosiloxane in the presence of a basic catalyst in an organic solvent.
Inventors
- 👤 Fusaji Shoji
- 👤 Issei Takemoto
- 👤 Fumio Kataoka
- 👤 Hitoshi Yokono
- 👤 Tokio Isogai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:07
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/52; C08G77/42; C08G77/44
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A heat-resistant silicone block polymer obtained by reaction of 100 parts by weight of organosilsesquioxane having the following formula (5): ##STR17## wherein R 1 is a lower alkyl group having 1 to 5 carbon atoms and/or an aryl group and n is an integer of from 0 to 4,000, with 5 to 400 parts by weight of a silicone compound or organosiloxane represented by the formula (6) or (7): ##STR18## wherein R 2 is an arylene group, R 3 and R 4 are lower alkyl groups having 1 to 5 carbon atoms, alkenyl groups and/or aryl groups, and X is a chlorine atom, a hydroxyl group, an alkoxy group or an N,N-dialkylamino group, or ##STR19## wherein R 2 , R 3 and R 4 and X have the same meanings as defined heretofore and p is an integer of from 0 to 100, in an organic solvent and in the presence of 0.1 to 200 parts by weight of a basic catalyst per 100 parts by weight of the compound of the general formula (5).
Claim 2
Dependent Claim
175 words
A heat-resistant silicone block polymer obtained by reaction of 100 parts by weight of organosilsesquioxane having the following formula (5): ##STR17## wherein R 1 is a lower alkyl group having 1 to 5 carbon atoms and/or an aryl group and n is an integer of from 0 to 4,000, with 5 to 400 parts by weight of a silicone compound or organosiloxane represented by the formula (6) or (7): ##STR18## wherein R 2 is an arylene group, R 3 and R 4 are lower alkyl groups having 1 to 5 carbon atoms, alkenyl groups and/or aryl groups, and X is a chlorine atom, a hydroxyl group, an alkoxy group or an N,N-dialkylamino group, or ##STR19## wherein R 2 , R 3 and R 4 and X have the same meanings as defined heretofore and p is an integer of from 0 to 100, in an organic solvent and in the presence of 0.1 to 200 parts by weight of a basic catalyst per 100 parts by weight of the compound of the general formula (5).
Claim 3
Dependent Claim
88 words
A heat-resistant silicone block polymer according to claim 1, wherein said basic catalyst is selected from the group consisting of pyridine, triethylamine, picoline, quinoline, and N,N-dialkylaniline when X is a chlorine atom, an alkoxy group or an N,N-dialkylamino group in a compound of the formula (6) or (7) and the basic catalyst is selected from the group consisting of pyridine, triethylamine, picoline, quinoline, N,N-dialkylaniline, tetramethylammonium acetate, n-hexylamino-2-ethylhexoate, tetramethylguanidine-di-2-ethylhexoate, piperidine, triethanolamine, and 1,4-diazobicyclo-[2,2,2]-octane when X is a hydroxyl group in the compound of the general formula (6) or (7).
Claim 4
Dependent Claim
73 words
A heat-resistant silicone block polymer according to claim 1, wherein the organosilsesquioxane represented by the formula (5) is a hydroxyl-terminated compound selected from the group consisting of phenylsilsesquioxane, chlorophenylsilsesquioxane, diphenylsilsesquioxane, naphthylsilsesquioxane, tolylsilsesquioxane, cyanophenylsilsesquioxane, benzoylphenylsilsesquioxane, p-phenoxyphenylsilsesquioxane, methylsilsesquioxane, ethylsilsesquioxane, propylsilsesquioxane and tertbutylsilsesquioxane; the compound of the formula (6) is selected from the group consisting of bis(hydroxydimethylsilyl)benzene, bis(hydroxydiphenylsilyl)benzene, bis(hydroxydivinylsilyl)benzene; and the compound of formula (7) is selected from the group consisting of polytetramethyl-p-silphenylenesiloxane, polytetraphenyl-p-silphenylenesiloxane and polytetravinyl-p-silphenylenesiloxane.
Claim 5
Dependent Claim
30 words
A heat-resistant silicone block polymer according to claim 1, wherein said organic solvent is an aromatic hydrocarbon, halogenated alkane and ether, a ketone, a polar solvent or a mixture thereof.
Claim 6
Dependent Claim
35 words
A heat-resistant silicone block polymer according to claim 1, wherein said organic solvent is benzene, toluene, methoxybenzene, veratrole, diphenyl, diphenylether, dichloromethane, chloroform, diethylether, diethylpropyl ether, tetrahydrofuran, acetone, methylisobutyl ketone, N-methyl-2-pyrolidone, N-cyclohexyl-2-pyrolidone or a mixture thereof.
Claim 7
Dependent Claim
25 words
A heat-resistant silicone block polymer according to claim 1, wherein the reaction is effected at 50° C. to 200° C. for 5 to 50 hours.
Claim 8
Dependent Claim
39 words
A heat-resistant silicone block polymer according to claim 1, wherein the arylene group is selected from the group consisting of ##STR20## and a xylylene group, and the aryl group is selected from the group consisting of phenyl and tolyl.
References Cited (Backward Citations)
US2383817A
Cited
US2562000A
Cited
US3017386A
Cited
US3202634A
Cited
US3278461A
Cited
US3294737A
Cited
US3318844A
Cited
US3398175A
Cited
US3372133A
Cited
JPS56828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-22 | 1988-10-22 | 1989-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-22 | 1992-10-22 | 1993-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-22 | 1996-10-22 | 1997-04-23 | $7700.00 | Window Closed / Lapsed |