US5077121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength high modulus polyolefin composite with improved solid state drawability
Assignee: Union Carbide Chemicals and Plastics Technology LLC
•
Filing: 1988-10-27
•
Granted: 1991-12-31
•
Expires: 2008-10-27
Abstract
Abstract A high modulus, high strength coextruded polyolefin composite which can be drawn to higher draw ratios than single sheets of the polymers of which it is made is disclosed. It comprises a core layer of a polymer selected from the group consisting of polypropylene, polyethylene and linear low density polyethylene, and cap layers of a polymer selected from the group consisting of polybutylene homopolymers and copolymers with ethylene.
Inventors
- 👤 Ian R. Harrison
- 👤 George B. Klingensmith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:53
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B2307/00; B32B2307/50; B32B2307/54; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/911; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A polyolefin composite with a tensile strength of at least about 70,000 psi, a 1% secant modulus of at least about 1.5 million psi, elongation at break of no more than 10%, superior creep resistance and which can be drawn to higher draw ratios than single sheets of the polymers of which it is made, which comprises: (a) a core layer of a polymer selected from the group consisting of polypropylene, polyethylene and linear low density polyethylene; and (b) cap layers of a polymer selected from the group consisting of polybutylene, homopolymers and copolymers with ethylene.
Claim 2
Dependent Claim
96 words
A polyolefin composite with a tensile strength of at least about 70,000 psi, a 1% secant modulus of at least about 1.5 million psi, elongation at break of no more than 10%, superior creep resistance and which can be drawn to higher draw ratios than single sheets of the polymers of which it is made, which comprises: (a) a core layer of a polymer selected from the group consisting of polypropylene, polyethylene and linear low density polyethylene; and (b) cap layers of a polymer selected from the group consisting of polybutylene, homopolymers and copolymers with ethylene.
Claim 3
Dependent Claim
21 words
The composite of claim 1 wherein the cap layers comprise from about 10 to 20% of the thickness of the composite.
Claim 4
Dependent Claim
16 words
The composite of claim 1 wherein the draw ratio of the composite is at least 15.
Claim 5
Dependent Claim
27 words
The composite of claim 1 wherein (a) is polypropylene and (b) is polybutene-1 homopolymer or a copolymer of polybutene-1 and from about 0.5 to about 6% ethylene.
References Cited (Backward Citations)
GB1495776A
Cited
US4125660A
Cited
US4297415A
Cited
US4282277A
Cited
US4456660A
Cited
US4348350A
Cited
US4380567A
Cited
US4413110A
Cited
US4451524A
Cited
US4451524B1
Cited
JPS6021537A
Cited
JPS62173637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |