US5194649A
Expired / Lapsed
US
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Organopentasiloxane and method for its preparation
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1992-01-27
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Granted: 1993-03-16
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Expires: 2012-01-27
Abstract
Abstract This invention relates to an organopentasiloxane with the following formula ##STR1## wherein A is the hydrogen atom or an aliphatically unsaturated monovalent hydrocarbon group, R is the same or different monovalent hydrocarbon group, and n is an integer with a value of 2 to 4, which carries silicon-bonded hydrogen or a silicon-bonded, aliphatically unsaturated monovalent hydrocarbon group at one molecular chain terminal and silicon-bonded organoxy group(s) at the other terminal.
Inventors
- 👤 Tadashi Okawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:52
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/12; C07F7/0834; C07F7/0838; C07F7/0896
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
Organopolysiloxane with the formula ##STR25## wherein A is the hydrogen atom or an aliphatically unsaturated monovalent hydrocarbon group selected from the group consisting of the norborneyl group and alkenyl group, R is selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, hexyl, vinyl, allyl, betenyl, hexenyl, isopropenyl, phenyl, tolyl, xylyl, benzyl, phenethyl, chloroethyl, nd 3,3,3-trifuloropropyl, wherein the groups R may be identical or may differ, and n is an integer with a value of 2 through 4.
Claim 2
Dependent Claim
79 words
Organopolysiloxane with the formula ##STR25## wherein A is the hydrogen atom or an aliphatically unsaturated monovalent hydrocarbon group selected from the group consisting of the norborneyl group and alkenyl group, R is selected from the group consisting of methyl, ethyl, propyl, butyl, pentyl, hexyl, vinyl, allyl, betenyl, hexenyl, isopropenyl, phenyl, tolyl, xylyl, benzyl, phenethyl, chloroethyl, nd 3,3,3-trifuloropropyl, wherein the groups R may be identical or may differ, and n is an integer with a value of 2 through 4.
Claim 3
Dependent Claim
9 words
The organopentasiloxane of claim 1 of the formula ##STR26##
Claim 4
Dependent Claim
9 words
The organopentasiloxane of claim 1 of the formula ##STR27##
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) | 1996-03-15 | 1996-09-14 | 1997-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-15 | 2000-09-14 | 2001-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-15 | 2004-09-14 | 2005-03-16 | $7700.00 | Window Closed / Lapsed |