US4743649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films of linear ethylene polymer and high impact polystyrene
Assignee: Pactiv LLC
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Filing: 1986-09-02
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Granted: 1988-05-10
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Expires: 2006-09-02
Abstract
Abstract Films of linear ethylene polymers, particularly copolymers of ethylene and alpha-olefins of 4 to 10 carbon atoms (LLDPE), containing up to about 15 weight percent of an impact polymer, e.g. impact polystyrene, exhibit excellent film properties and improved blocking.
Inventors
- 👤 David V. Dobreski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:05
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L51/00; C08L51/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
80 words
A film comprising a linear copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms having a density of less than 0.94 which has blocking tendencies in film form and from 1 up to about 15 weight percent of an impact polymer which is an impact polystyrene or impact poly(para-methylstyrene) containing 1 to 20 weight percent of rubber; said film having reduced blocking compared to a film containing said copolymer of ethylene and the same amount of polystyrene.
Claim 2
Dependent Claim
80 words
A film comprising a linear copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms having a density of less than 0.94 which has blocking tendencies in film form and from 1 up to about 15 weight percent of an impact polymer which is an impact polystyrene or impact poly(para-methylstyrene) containing 1 to 20 weight percent of rubber; said film having reduced blocking compared to a film containing said copolymer of ethylene and the same amount of polystyrene.
Claim 3
Dependent Claim
20 words
The film of claim 1 in which said impact polymer comprises up to 8 percent by weight of the composition.
Claim 4
Dependent Claim
18 words
The film of claim 1 in which said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 5
Dependent Claim
23 words
The film of claim 1 in which said impact polymer contains rubber particles having an average particle diameter of 2 to 20 microns.
Claim 6
Dependent Claim
23 words
The film of claim 3 in which said impact polymer contains rubber particles having an average particle diameter of 2 to 20 microns.
Claim 7
Dependent Claim
29 words
The film of claim 1 in which said linear ethylene polymer is a copolymer of ethylene and butene, said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 8
Dependent Claim
29 words
The film of claim 1 in which said linear ethylene polymer is a copolymer of ethylene and hexene, said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 9
Dependent Claim
29 words
The film of claim 1 in which said linear ethylene polymer is a copolymer of ethylene and octene, said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 10
Dependent Claim
29 words
The film of claim 4 in which said linear ethylene polymer is a copolymer of ethylene and butene, said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 11
Dependent Claim
29 words
The film of claim 4 in which said linear ethylene polymer is a copolymer of ethylene and hexene, said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 12
Dependent Claim
29 words
The film of claim 4 in which said linear ethylene polymer is a copolymer of ethylene and octene, said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 13
Dependent Claim
13 words
The film of claim 1 which contains 4 to 10 weight percent rubber.
Claim 14
Dependent Claim
13 words
The film of claim 1 in which said impact polymer is impact polystyrene.
Claim 15
Dependent Claim
13 words
The film of claim 1 in which said impact polymer is impact poly(para-methylstyrene).
References Cited (Backward Citations)
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Cited
US4306049A
Cited
US4255531A
Cited
US4386188A
Cited
US4495323A
Cited
US4579912A
Cited
US4503187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |