US5066723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact-modified polymers (p-1304)
Assignee: Tonen General Sekiyu KK
•
Filing: 1990-12-21
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Granted: 1991-11-19
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Expires: 2010-12-21
Abstract
Abstract Impact-modified polymeric materials are produced by visbreaking certain reactor blends. In a preferred embodiment, impact-modified polypropylene materials are produced by visbreaking a reactor blend of polypropylene and thermoplastic polyethylene. The polypropylene material is preferably homopolypropylene having a melt flow rate of less than about 1 dg/min. Such impact-modified polymeric materials manifest unexpected compatibility characteristics, increased impact resistance at low temperatures, improved antiblush characteristics and improved flow characteristics.
Inventors
- 👤 James C. Randall, Jr.
- 👤 Terrence Huff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:28
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08F; C08F8/00; C08F8/50; C08L23/04; B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/16; C08F2800/00; C08F2800/10; C08F2810/00; C08F2810/10; C08L2308/00; C08L2314/00; C08L2314/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
163 words
A process for preparing a high impact propylene polymer composition which does not contain rubber materials comprising: a. polymerizing propylene or a mixture of propylene and one or more monomers selected from C 2 or C 4 -C 10 alpha olefins in the presence of a Ziegler catalyst, wherein a substantially isotactic propylene polymer containing at least about 90 wt.% of polymerized propylene is obtained; b. polymerizing ethylene or a mixture of ethylene and one or more C 3 to C 10 alpha olefin monomers in the presence of the propylene polymer composition of step (a) and optionally in the presence of additional Ziegler catalyst wherein a reactor blend comprising a continuous phase propylene polymer and a discontinuous phase thermoplastic polymer containing at least about 90 wt% of polymerized ethylene is obtained; c. recovering the reactor blend of step (b); and d. heating said reactor blend of step (c) in the presence of a free radical source to provide a visbroken reactor blend.
Claim 2
Dependent Claim
163 words
A process for preparing a high impact propylene polymer composition which does not contain rubber materials comprising: a. polymerizing propylene or a mixture of propylene and one or more monomers selected from C 2 or C 4 -C 10 alpha olefins in the presence of a Ziegler catalyst, wherein a substantially isotactic propylene polymer containing at least about 90 wt.% of polymerized propylene is obtained; b. polymerizing ethylene or a mixture of ethylene and one or more C 3 to C 10 alpha olefin monomers in the presence of the propylene polymer composition of step (a) and optionally in the presence of additional Ziegler catalyst wherein a reactor blend comprising a continuous phase propylene polymer and a discontinuous phase thermoplastic polymer containing at least about 90 wt% of polymerized ethylene is obtained; c. recovering the reactor blend of step (b); and d. heating said reactor blend of step (c) in the presence of a free radical source to provide a visbroken reactor blend.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein said heating in step (d) is conducted at a temperature of at least about 190° C.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein said free radical source is selected from the group consisting of an organic peroxide, electron beam irradiation, x-ray radiation and ultraviolet radiation.
Claim 5
Dependent Claim
14 words
The process of claim 3 wherein said free radical source is an organic peroxide.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein said propylene polymer is polypropylene.
Claim 7
Dependent Claim
16 words
The process of claim 5 wherein said polypropylene has a MFR less than about 1.0 dg/min.
Claim 8
Dependent Claim
16 words
The process of claim 5 wherein said polypropylene has an MFR less than about 0.5 dg/min.
Claim 9
Dependent Claim
16 words
The process of claim 5 wherein said polypropylene has an MFR less than about 0.2 dg/min.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein said ethylene polymer is polyethylene.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein said polyethylene is linear low density polyethylene.
Claim 12
Dependent Claim
13 words
The process of claim 1 wherein said Ziegler catalyst is a titanium-containing catalyst.
Claim 13
Dependent Claim
27 words
The process of claim 1 wherein said step (a) polymerization is conducted in the liquid phase and said step (b) polymerization is conducted in the gaseous phase.
Claim 14
Dependent Claim
22 words
The process of claim 1 wherein said propylene polymer composition product of step (a) comprises a mixture of propylene polymer and catalyst.
Claim 15
Dependent Claim
20 words
The process of claim 1 wherein said visbroken reactor blend contains at least about 70 wt.% of said propylene polymer.
Claim 16
Dependent Claim
32 words
The process of claim 14 wherein said visbroken reactor blend contains from about 70 to about 95 wt% of propylene polymer and from abut 5 to about 30 wt% of ethylene polymer.
Claim 17
Dependent Claim
18 words
The process of claim 1 wherein step (a) is conducted in the substantial absence of chain terminating agents.
Claim 18
Dependent Claim
13 words
A high impact propylene polymer composition produced by the process of claim 1.
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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) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |