US4202807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organopolysiloxane compositions modified with polyurethane
Assignee: Bayer AG
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Filing: 1978-06-21
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Granted: 1980-05-13
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Expires: 1998-06-21
Abstract
Abstract Polyurethane is present as a solid phase in a liquid polyorganosiloxane, preferably being formed therein by mixing a polyhydroxy-containing material with the polysiloxane followed by addition of a polyisocyanate. If the polyorganosiloxane contains hydroxyl groups it can be chemically bonded to the polyurethane. The composition can be cured to solid plastic masses of superior properties by adding a curing agent for the polysiloxane.
Inventors
- 👤 Hans-Heinrich Moretto
- 👤 Armand DE Montigny
- 👤 Helmut Steinberger
- 👤 Hans Sattlegger
- 👤 Ingrid Larking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:06
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/28; C08G18/40; C08G18/61; C08G77/00; C08G77/42; C08G77/452; C08G77/458; C08L83/00; C08L83/04; C08G77/455
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
A process for producing a composition comprising a polysiloxane and a polyurethane each present as a discernible phase comprising mixing at a temperature from about room temperature to about 150° C. a liquid polysiloxane of the formula ##STR2## in which R is an alkyl, alkenyl, aryl or halogenoalkyl radical with up to about 10 C atoms, R' is hydrogen, or an alkyl, alkenyl, aryl or halogenoalkyl radical with up to about 10 C atoms, X is hydroxyl, vinyl or methyl, n is 2 to about 1,000, and m is 1 to about 50, the polysiloxane having a viscosity of the order of about 10,000 centipoise, with a material which with a polyisocyanate will form a polyurethane, thereafter adding to said mixture a polyisocyanate of the formula OCN--R.sup.1 --NCO in which R 1 is an optionally substituted alkylene or arylene radical with up to 24 C atoms, thereby to form said polyurethane as a discernible phase in the liquid polysiloxane, the proportions of polysiloxane, polyurethane-forming material and polyisocyanate being such that the formed polyurethane constitutes about 40-80% of the weight of polysiloxane plus polyurethane.
Claim 2
Dependent Claim
183 words
A process for producing a composition comprising a polysiloxane and a polyurethane each present as a discernible phase comprising mixing at a temperature from about room temperature to about 150° C. a liquid polysiloxane of the formula ##STR2## in which R is an alkyl, alkenyl, aryl or halogenoalkyl radical with up to about 10 C atoms, R' is hydrogen, or an alkyl, alkenyl, aryl or halogenoalkyl radical with up to about 10 C atoms, X is hydroxyl, vinyl or methyl, n is 2 to about 1,000, and m is 1 to about 50, the polysiloxane having a viscosity of the order of about 10,000 centipoise, with a material which with a polyisocyanate will form a polyurethane, thereafter adding to said mixture a polyisocyanate of the formula OCN--R.sup.1 --NCO in which R 1 is an optionally substituted alkylene or arylene radical with up to 24 C atoms, thereby to form said polyurethane as a discernible phase in the liquid polysiloxane, the proportions of polysiloxane, polyurethane-forming material and polyisocyanate being such that the formed polyurethane constitutes about 40-80% of the weight of polysiloxane plus polyurethane.
Claim 3
Dependent Claim
27 words
The process according to claim 1, including the further steps of adding to the composition a curing catalyst for the polysiloxane, and allowing the composition to cure.
Claim 4
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 5
Dependent Claim
29 words
The product according to claim 3, wherein the polysiloxane is present as a continuous liquid phase and the polyurethane is present as a non-continuous phase of finely divided particles.
Claim 6
Dependent Claim
25 words
The product according to claim 3, wherein at least about 80% of the polyurethane particles have an average diameter of about 0.3 to 10 microns.
Claim 7
Dependent Claim
9 words
The product produced by the process of claim 2.
References Cited (Backward Citations)
US3388101A
Cited
US3708467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-13 | 1983-11-12 | 1984-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-13 | 1987-11-12 | 1988-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-13 | 1991-11-12 | 1992-05-13 | $7700.00 | Window Closed / Lapsed |