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Patent US4013698A successfully refreshed from Google Patents.
US4013698A
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Polysiloxanes containing hydroxyl groups
Assignee: Novartis Corp
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Filing: 1976-03-29
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Granted: 1977-03-22
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Expires: 1996-03-29
Abstract
Abstract Polysiloxanes containing hydroxyl groups are manufactured by reacting polysiloxanes, which have been (so-called) advanced with polyols and which contain alkoxy groups, with aliphatic or cycloaliphatic diols in the presence of a catalyst at elevated temperatures. The new polysiloxanols can be used as modifiers for organic resins such as urethane resins or epoxide resins, and give flexible, hydrophobic plastics having valuable mechanical properties.
Inventors
- 👤 Friedrich Lohse
- 👤 Kurt Munk
- 👤 Heinz Rembold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4085; C08G77/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A polysiloxane of formula I ##STR12## wherein A denotes a di- or three-valent apliphatic or cycloaliphatic-aliphatic residue with 2-15 C atoms in the molecule, R 1 and R 2 each denote methyl, ethyl, propyl or phenyl, and wherein R 1 and R 2 on the same Si atom denote identical substituents and within the siloxane chain denote different substituents, R 3 denotes an alkylene with 2-8 C atoms interrupted by a ##STR13## n denotes the number 2 or 3 and x denotes a number from 2 to 20.
Claim 2
Dependent Claim
88 words
A polysiloxane of formula I ##STR12## wherein A denotes a di- or three-valent apliphatic or cycloaliphatic-aliphatic residue with 2-15 C atoms in the molecule, R 1 and R 2 each denote methyl, ethyl, propyl or phenyl, and wherein R 1 and R 2 on the same Si atom denote identical substituents and within the siloxane chain denote different substituents, R 3 denotes an alkylene with 2-8 C atoms interrupted by a ##STR13## n denotes the number 2 or 3 and x denotes a number from 2 to 20.
Claim 3
Dependent Claim
95 words
A polysiloxane according to claim 1, wherein in the formula II ##STR14## R denotes a di- or three-valent aliphatic or cycloaliphatic-aliphatic residue with 2-10 C atoms in the molecule, R 1 and R 2 each denote a methyl, ethyl, propyl or phenyl, and whereby R 1 and R 2 on the same Si atom denote identical substituents and within the poly-siloxane chain denote different substituents, R 3 denotes an alkylene with 2-8 C atoms interrupted by a ##STR15## group, n denotes the number 2 or 3 and x denotes a number from 2 to 20.
Claim 4
Dependent Claim
53 words
A polysiloxane of the formula ##STR16## wherein A is the residue from hydroxypivalic acid neopentyl glycol ester, R 1 and R 2 are each methyl on one silicon atom and are each phenyl on the alternate silicon atom in the polysiloxane chain, R 3 denotes 2-ethyl-3-propylpropylene, n denotes 2, and x denotes 2.
Claim 5
Dependent Claim
53 words
A polysiloxane of the formula ##STR16## wherein A is the residue from hydroxypivalic acid neopentyl glycol ester, R 1 and R 2 are each methyl on one silicon atom and are each phenyl on the alternate silicon atom in the polysiloxane chain, R 3 denotes 2-ethyl-3-propylpropylene, n denotes 2, and x denotes 2.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |