US4826920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films of linear ethylene polymer, polystyrene, and high impact polystyrene
Assignee: Pactiv LLC
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Filing: 1987-12-18
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Granted: 1989-05-02
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Expires: 2007-12-18
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 a 1:3 to 3:1 ratio of polystyrene or poly(para-methylstyrene), and 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
2026-11-06 16:16
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08J; C08J5/00; C08J5/18; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08L2205/00; C08L2205/03; C08L2205/035; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L25/16; C08L9/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
70 words
A film comprising a linear ethylene polymer having a density in the range of from about 0.85 to about 0.96 and a total of up to about 15 weight percent of a mixture of (A) polystyrene or poly(paramethylstyrene) and (B) an impact polymer which is an impact polystyrene or impact poly(para-methylstyrene) containing 1 to 20 weight percent of rubber, in a weight ratio of (A) to (B) 1:3 to 3:1.
Claim 2
Dependent Claim
70 words
A film comprising a linear ethylene polymer having a density in the range of from about 0.85 to about 0.96 and a total of up to about 15 weight percent of a mixture of (A) polystyrene or poly(paramethylstyrene) and (B) an impact polymer which is an impact polystyrene or impact poly(para-methylstyrene) containing 1 to 20 weight percent of rubber, in a weight ratio of (A) to (B) 1:3 to 3:1.
Claim 3
Dependent Claim
37 words
The film of claim 1 in which said linear ethylene polymer is a copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms having a density in the range from about 0.90 to about 0.94.
Claim 4
Dependent Claim
44 words
The film of claim 1 in which said linear ethylene polymer is a copolymer of ethylene and an alpha-olefin having 4 to 8 carbon atoms having a density in the range of from about 0.91 to about 0.94, and said polymer is impact polystyrene.
Claim 5
Dependent Claim
44 words
The film of claim 1 in which said linear ethylene polymer is a copolymer of ethylene and an alpha-olefin having 4 to 10 carbon atoms having a density in the range from about 0.90 to about 0.94 and said impact polymer is impact poly(para-methylstyrene).
Claim 6
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 7
Dependent Claim
18 words
The film of claim 1 in which said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 8
Dependent Claim
18 words
The film of claim 2 in which said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 9
Dependent Claim
18 words
The film of claim 5 in which said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 10
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 11
Dependent Claim
23 words
The film of claim 2 in which said impact polymer contains rubber particles having an average particle diameter of 2 to 20 microns.
Claim 12
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 13
Dependent Claim
23 words
The film of claim 6 in which said impact polymer contains rubber particles having an average particle diameter of 2 to 20 microns.
Claim 14
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 15
Dependent Claim
29 words
The film of claim 1 in which said linear ethyelen polymer is a copolymer of ethylene and hexene, said impact polymer is impact polystyrene and said rubber is polybutadiene.
Claim 16
Dependent Claim
29 words
The film of claim 1 in which said linear ethylene polymer is a copolymer of ethylene and octene, said imp act is impact polystyrene and said rubber is polybutadiene.
Claim 17
Dependent Claim
29 words
The film of claim 9 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 18
Dependent Claim
29 words
The film of claim 10 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 19
Dependent Claim
29 words
The film of claim 11 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 20
Dependent Claim
19 words
The film of claim 1 in which the rubber comprises 4 to 10 weight percent of the impact polymer.
Claim 21
Dependent Claim
19 words
The film of claim 3 in which the rubber comprises 4 to 10 weight percent of the impact polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |