US4716197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene/EPDM-graft polystyrene blends
Assignee: Dow Chemical Co
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Filing: 1986-04-21
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Granted: 1987-12-29
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Expires: 2006-04-21
Abstract
Abstract The specification discloses a polymer blend comprising from about 20 to 90% of an olefin combination including a high density polyolefin and a linear low density polyolefin, from about 6 to about 60% of a vinyl aromatic polymer and from about 4 to about 20% of a compatibilizer therefore.
Inventors
- 👤 Randolph H. Seiss
- 👤 Edward H. Yonkers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:43
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L2205/00; C08L2205/02; C08L23/08; C08L51/00; C08L51/06
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
71 words
A polymer blend comprising: from about 20 to about 90% of a blend of high density polyethylene and a linear low density polyethylene, of which from about 15 to about 85% comprises said linear low density polyethylene; from about 6 to about 60% of a vinyl aromatic polymer; and from about 4 to about 20% of a vinyl aromatic grafted alpha-olefin copolymer compatibilizer for said vinyl aromatic polymer and said polyethylenes.
Claim 2
Dependent Claim
71 words
A polymer blend comprising: from about 20 to about 90% of a blend of high density polyethylene and a linear low density polyethylene, of which from about 15 to about 85% comprises said linear low density polyethylene; from about 6 to about 60% of a vinyl aromatic polymer; and from about 4 to about 20% of a vinyl aromatic grafted alpha-olefin copolymer compatibilizer for said vinyl aromatic polymer and said polyethylenes.
Claim 3
Dependent Claim
13 words
The polymer blend of claim 1 in which said vinyl aromatic comprises polystyrene.
Claim 4
Dependent Claim
15 words
The polymer blend of claim 2 in which said compatibilizer comprises an EPDM graft polystyrene.
Claim 5
Dependent Claim
24 words
The polymer blend of claim 3 in which the graft ratio of grafted polystyrene to EPDM rubber is from about 0.1 to about 2.0.
Claim 6
Dependent Claim
24 words
The polymer blend of claim 3 in which the graft ratio of grafted polystyrene to EPDM rubber is from about 0.7 to about 2.0.
Claim 7
Dependent Claim
25 words
The polymer blend of claim 5 in which the weight average molecular weight of the grafted polystyrene chains is from about 150,000 to about 225,000.
Claim 8
Dependent Claim
24 words
The polymer blend of claim 6 in which the molecular weight of ungrafted polystyrene in said blend is from about 150,000 to about 225,000.
Claim 9
Dependent Claim
161 words
A polymer blend comprising: from about 90 to about 20% of an olefin combination including a high density polyethylene having a density of at least 0.94 grams per cubic centimeter and a melt index in the range of from about 0.01 to about 35 grams per 10 minutes, and a linear low density polyethylene having a density from about 0.91 to about 0.94 grams per cubic centimeter and a melt index within the range of from about 0.01 to about 15 grams per 10 minutes, said linear low density polyethylene comprising from about 15 to about 85% of said olefin combination; from about 6 to about 60% polystyrene having a weight average molecular weight of from about 150,000 to about 225,000; and from about 4 to about 20% of an EPDM graft polystyrene compatibilizer having a graft ratio of from about 0.1 to about 2.0 wherein the molecular weight of the grafted polystyrene chains is from about 150,000 to about 225,000.
Claim 10
Dependent Claim
161 words
A polymer blend comprising: from about 90 to about 20% of an olefin combination including a high density polyethylene having a density of at least 0.94 grams per cubic centimeter and a melt index in the range of from about 0.01 to about 35 grams per 10 minutes, and a linear low density polyethylene having a density from about 0.91 to about 0.94 grams per cubic centimeter and a melt index within the range of from about 0.01 to about 15 grams per 10 minutes, said linear low density polyethylene comprising from about 15 to about 85% of said olefin combination; from about 6 to about 60% polystyrene having a weight average molecular weight of from about 150,000 to about 225,000; and from about 4 to about 20% of an EPDM graft polystyrene compatibilizer having a graft ratio of from about 0.1 to about 2.0 wherein the molecular weight of the grafted polystyrene chains is from about 150,000 to about 225,000.
Claim 11
Dependent Claim
17 words
The polymer blend of claim 8 wherein said graft ratio is from about 0.7 to about 2.0.
Claim 12
Dependent Claim
45 words
The polymer blend of claim 9 wherein the EPDM base rubber of said EPDM graft polystyrene comprises from about 25 to about 75% by weight ethylene, from about 20 to about 65% by weight propylene and from about 1 to about 10% by weight 5-ethylidene-2-norbornene.
Claim 13
Independent Claim
37 words
A method for improving the directional strength of a blend of a vinyl aromatic polymer, a high density polyethylene and a vinyl aromatic grafted alpha-olefin copolymer compatibilizer comprising: introducing a linear low density polyethylene into said blend.
Claim 14
Independent Claim
37 words
A method for improving the directional strength of a blend of a vinyl aromatic polymer, a high density polyethylene and a vinyl aromatic grafted alpha-olefin copolymer compatibilizer comprising: introducing a linear low density polyethylene into said blend.
Claim 15
Dependent Claim
63 words
The method of claim 11 which comprises blending from about 20 to about 90% of a blend of high density polyethylene and said linear low density polyethylene, of which from about 15 to about 85% comprises said linear low density polyethylene, with from about 6 to about 60% of said vinyl aromatic polymer and from about 4 to about 20% of said compatibilizer.
Claim 16
Dependent Claim
12 words
The method of claim 12 in which said vinyl aromatic comprises polystyrene.
Claim 17
Dependent Claim
14 words
The method of claim 13 in which said compatibilizer comprises an EPDM graft polystyrene.
Claim 18
Dependent Claim
23 words
The method of claim 14 in which the graft ratio of grafted polystyrene to EPDM rubber is from about 0.1 to about 2.0.
Claim 19
Dependent Claim
23 words
The method of claim 14 in which the graft ratio of grafted polystyrene to EPDM rubber is from about 0.7 to about 2.0.
Claim 20
Dependent Claim
23 words
The method of claim 16 in which the weight average molecular weight of grafted polystyrene chains is from about 150,000 to about 225,000.
Claim 21
Dependent Claim
23 words
The method of claim 17 in which the molecular weight of ungrafted polystyrene in said blend is from about 150,000 to about 225,000.
Claim 22
Independent Claim
184 words
A method for producing a vinyl aromatic and olefin polymer blend having surprisingly high impact strength, including impact strength in a cross direction when extruded, comprising blending: from about 90 to about 20% of an olefin combination comprising a high density polyethylene having a density of at least 0.94 grams per cubic centimeter and a melt index in the range of from about 0.01 to about 35 grams per 10 minutes, and a linear low density polyethylene having a density from about 0.91 to about 0.94 grams per cubic centimeter and a melt index within the range of from about 0.01 to about 15 grams per 10 minutes, said linear low density polyethylene comprising of said olefin combination from about 15 to about 85%; from about 6 to about 60% polystyrene having a weight average molecular weight of from about 150,000 to about 225,000; and from about 4 to about 20% of an EPDM graft polystyrene compatibilizer having a graft ratio of from about 0.1 to about 2.0 wherein the molecular weight of the grafted polystyrene chains is from about 150,000 to about 225,000.
Claim 23
Independent Claim
184 words
A method for producing a vinyl aromatic and olefin polymer blend having surprisingly high impact strength, including impact strength in a cross direction when extruded, comprising blending: from about 90 to about 20% of an olefin combination comprising a high density polyethylene having a density of at least 0.94 grams per cubic centimeter and a melt index in the range of from about 0.01 to about 35 grams per 10 minutes, and a linear low density polyethylene having a density from about 0.91 to about 0.94 grams per cubic centimeter and a melt index within the range of from about 0.01 to about 15 grams per 10 minutes, said linear low density polyethylene comprising of said olefin combination from about 15 to about 85%; from about 6 to about 60% polystyrene having a weight average molecular weight of from about 150,000 to about 225,000; and from about 4 to about 20% of an EPDM graft polystyrene compatibilizer having a graft ratio of from about 0.1 to about 2.0 wherein the molecular weight of the grafted polystyrene chains is from about 150,000 to about 225,000.
Claim 24
Dependent Claim
16 words
The method of claim 19 wherein said graft ratio is from about 0.7 to about 2.0.
Claim 25
Dependent Claim
44 words
The method of claim 20 wherein the EPDM base rubber of said EPDM graft polystyrene comprises from about 25 to about 75% by weight ethylene, from about 20 to about 65% by weight propylene and from about 1 to about 10% by weight 5-ethylidene-2-norbornene.
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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) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |