US4287108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of polypropylene and liquid saturated diorganopolysiloxanes
Assignee: Bayer AG
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Filing: 1980-02-08
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Granted: 1981-09-01
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Expires: 2000-02-08
Abstract
Abstract A homogeneous, thermoplastic mixture comprising (A) from 85 to 99.5% by weight of isotactic polypropylene; and (B) from 15 to 0.5% by weight of a liquid, saturated diorganopolysiloxane having a viscosity of from 30,000 to 80,000 cSt at 20° C. The elastic properties of moulded articles produced from the polypropylene/diorganopolysiloxane mixtures of the present invention are substantially improved by the addition of small quantities of diorganopolysiloxane while their dimensional stability under heat and their rigidity are largely preserved.
Inventors
- 👤 Ulrich Grigo
- 👤 Leo Morbitzer
- 👤 Klaus-Peter Arlt
- 👤 Rudolf Binsack
- 👤 Josef Merten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:40
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A homogeneous thermoplastic mixture comprising (A) from 85 to 99.5% by weight of isotactic polypropylene having an isotactic portion of more than 90% by weight and a melt index of from 0.1 to 20 g/10 min at 230° C. under a load of 5 kg; and (B) from 15 to 0.5% by weight of a liquid, saturated diorganopolysiloxane having a viscosity of from 30,000 to 80,000 cSt at 20° C.
Claim 2
Dependent Claim
70 words
A homogeneous thermoplastic mixture comprising (A) from 85 to 99.5% by weight of isotactic polypropylene having an isotactic portion of more than 90% by weight and a melt index of from 0.1 to 20 g/10 min at 230° C. under a load of 5 kg; and (B) from 15 to 0.5% by weight of a liquid, saturated diorganopolysiloxane having a viscosity of from 30,000 to 80,000 cSt at 20° C.
Claim 3
Dependent Claim
39 words
A homogeneous thermoplastic mixture as claimed in claim 1 wherein component (A) is present in an amount of from 93 to 97% by weight and component (B) is present in an amount of from 3 to 7% by weight.
Claim 4
Dependent Claim
34 words
A homogeneous thermoplastic mixture as claimed in claim 1 wherein the isotactic polypropylene has a melt index of from 0.1 to 5 g/10 min at 230° C. and under a load of 5 kg.
Claim 5
Dependent Claim
26 words
A homogeneous thermoplastic mixture as claimed in claim 1 wherein the diorganopolysiloxane is a dialkylpolysiloxane having from 1 to 4 carbon atoms in each alkyl group.
Claim 6
Dependent Claim
15 words
A homogeneous thermoplastic mixture as claimed in claim 4 wherein the dialkylpolysiloxane is a dimethylpolysiloxane.
Claim 7
Dependent Claim
15 words
A homogeneous thermoplastic mixture as claimed in claim 1 wherein the diorganopolysiloxane is a methyl-phenylpolysiloxane.
Claim 8
Dependent Claim
14 words
Heat moulded articles prepared from a homogeneous thermoplastic mixture as claimed in claim 1.
References Cited (Backward Citations)
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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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |