US3981898A
Expired / Lapsed
US
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Polysiloxanes containing hydroxyl groups
Assignee: Novartis Corp
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Filing: 1975-03-17
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Granted: 1976-09-21
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Expires: 1995-03-17
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
2026-11-02 14:17
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4085; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C07F7/18; C07F7/1804; C08G77/00; C08G77/48; C08G77/50; C08G77/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A polysiloxane of formula I ##EQU1## wherein A denotes a di- or three-valent aliphatic or cycloaliphatic-aliphatic residue with 2-15 C atoms in the molecule, R 1 and R 2 each denote a 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 2-6 C atoms, a lower alkyl-substituted alkylene with 2-6 C atoms in the alkylene chain, or a cycloaliphatic-aliphatic residue, n denotes the number 2 or 3 and x denotes a number from 2 to 20.
Claim 2
Dependent Claim
101 words
A polysiloxane of formula I ##EQU1## wherein A denotes a di- or three-valent aliphatic or cycloaliphatic-aliphatic residue with 2-15 C atoms in the molecule, R 1 and R 2 each denote a 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 2-6 C atoms, a lower alkyl-substituted alkylene with 2-6 C atoms in the alkylene chain, or a cycloaliphatic-aliphatic residue, n denotes the number 2 or 3 and x denotes a number from 2 to 20.
Claim 3
Dependent Claim
106 words
A polysiloxane according to claim 1, wherein in the formula II ##STR12## 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 onthe same Si atom denote identical substituents and within the poly-siloxane chain denote differennt substituents, R 3 denotes an alkylene radical with 2-6 C atoms, a lower alkyl-substituted alkylene with 2-6 C atoms in the alkylene chain or a cycloaliphatic-aliphatic radical, n denotes the number 2 or 3 and x denotes a number from 2 to 20.
Claim 4
Dependent Claim
50 words
A polysiloxane according to claim 2, characterised in that in the linear polysiloxane chain dimethylsiloxane units alternate with dipropylsiloxane or diphenylsiloxane units and R 3 denotes a lower alkyl-substituted alkylene with 2 to 3 C atoms in the alkylene chain, obtained by removal of the primary and secondary hydroxyl group.
Claim 5
Dependent Claim
15 words
A polysiloxane according to claim 3, characterised in that R 3 denotes the 2-ethyl-3-propylpropylene residue.
Claim 6
Dependent Claim
50 words
A polysiloxane according to claim 1 wherein A is the aliphatic residue from trimethylolpropane, 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 3, and x denotes 2.
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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |