Patent US4365044A successfully refreshed from Google Patents.
US4365044A
Expired / Lapsed
US
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Polypropylene composition for extrusion coating
Assignee: Himont Inc
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Filing: 1981-07-30
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Granted: 1982-12-21
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Expires: 2001-07-30
Abstract
Abstract This invention relates to a composition comprising crystalline polypropylene, a hydrogenated copolymer of vinyl toluene and alpha-methyl styrene and low density polyethylene which has improved extrudability compared to polypropylene alone.
Inventors
- 👤 Chia-Seng Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:19
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L2205/00; C08L2205/03; C08L23/04; C08L23/06; C08L25/00; C08L25/02; C08L25/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
141 words
A propylene polymer composition having improved extrudability, comprising (a) a crystalline polypropylene having a melt flow rate at 230° C. of at least 3, (b) low density polyethylene having a density of 0.915 to 0.920, a melt index of 3 to 15 and a G c value of at least 2.5×10 5 , and (c) a copolymer of vinyl toluene and alpha-methyl styrene, which has been hydrogenated to the point where at least 50% of its aromatic unsaturation has been reduced, and which has a drop softening point from about 100° to 160° C., component (b) being from 3 to 15 parts by weight per 100 parts of (a), component (c) being from 2 to 10 parts by weight per hundred parts of (a), and the total of (b) and (c) being 7 to 20 parts per hundred parts of (a).
Claim 2
Dependent Claim
141 words
A propylene polymer composition having improved extrudability, comprising (a) a crystalline polypropylene having a melt flow rate at 230° C. of at least 3, (b) low density polyethylene having a density of 0.915 to 0.920, a melt index of 3 to 15 and a G c value of at least 2.5×10 5 , and (c) a copolymer of vinyl toluene and alpha-methyl styrene, which has been hydrogenated to the point where at least 50% of its aromatic unsaturation has been reduced, and which has a drop softening point from about 100° to 160° C., component (b) being from 3 to 15 parts by weight per 100 parts of (a), component (c) being from 2 to 10 parts by weight per hundred parts of (a), and the total of (b) and (c) being 7 to 20 parts per hundred parts of (a).
Claim 3
Dependent Claim
35 words
A composition according to claim 1, characterized in that component (c) as an average molecular weight above about 600 (Rast Method), a softening point above 130° C., and an iodine value less than about 2.
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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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |