US4378404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene composition for extrusion coating
Assignee: Himont Inc
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Filing: 1982-08-18
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Granted: 1983-03-29
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Expires: 2002-08-18
Abstract
Abstract Disclosed is a composition comprising crystalline polypropylene, a hydrogenated copolymer of vinyl toluene and alpha-methyl styrene, and low density polyethylene, which composition has improved extrudability compared to polypropylene alone. Also disclosed are a coated substrate in which the coating is said composition, and a method of making a coated substrate, which comprises extrusion coating the substrate with the composition.
Inventors
- 👤 Chia-Seng Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:31
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; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T442/00; Y10T442/20; Y10T442/2025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A coated substrate in which the coating is a propylene polymer composition 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
146 words
A coated substrate in which the coating is a propylene polymer composition 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
24 words
A coated substrate according to claim 1 in which the substrate is selected from the group consisting of paper, paperboard, fabrics, and metal foils.
Claim 4
Independent Claim
152 words
A method of making a coated substrate, which comprises extrusion coating said substrate with a propylene polymer composition 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 5
Independent Claim
152 words
A method of making a coated substrate, which comprises extrusion coating said substrate with a propylene polymer composition 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).
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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) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |