Patent US5320899A successfully refreshed from Google Patents.
US5320899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic block copolymer films
Assignee: Kraton Polymers US LLC
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Filing: 1993-10-12
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Granted: 1994-06-14
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Expires: 2013-10-12
Abstract
Abstract The tensile properties of elastic polymer films which contain thermoplastic block copolymer compositions and ethylene/vinyl acetate copolymers are improved by replacing some of the ethylene/vinyl acetate with a polyolefin having low crystallinity. The increase in tensile strength occurs without significant loss of elasticity and is most significant when the polyolefin is an ultra-low density polyolefin.
Inventors
- 👤 Lie K. Djiauw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:16
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L33/00; C08L33/02; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A blown polymer film, comprising a thickness between about 0.5 and 10 mils; about 40% to about 80% of a thermoplastic block copolymer composition containing predominantly a block copolymer of a monoalkenylarene and an unsaturated conjugated diene; about 5% to about 20% of an ethylene/vinyl acetate copolymer having a vinyl acetate content between 12% and 33%; 10 to 45 parts polystyrene per hundred parts of the block copolymer in the block copolymer composition; and 5% to 20% of a polyolefin having a crystallinity less than 60%.
Claim 2
Dependent Claim
86 words
A blown polymer film, comprising a thickness between about 0.5 and 10 mils; about 40% to about 80% of a thermoplastic block copolymer composition containing predominantly a block copolymer of a monoalkenylarene and an unsaturated conjugated diene; about 5% to about 20% of an ethylene/vinyl acetate copolymer having a vinyl acetate content between 12% and 33%; 10 to 45 parts polystyrene per hundred parts of the block copolymer in the block copolymer composition; and 5% to 20% of a polyolefin having a crystallinity less than 60%.
Claim 3
Dependent Claim
23 words
The polymer film of claim 1, wherein the thermoplastic block copolymer composition is a blend of a polystyrene-polybutadiene-polystyrene block copolymer and an oil.
Claim 4
Dependent Claim
16 words
The polymer film of claim 2, wherein the polyolefin has a crystallinity from 50% to 58%.
Claim 5
Dependent Claim
18 words
The polymer film of claim 3, wherein the vinyl acetate content of the ethylene/vinyl acetate polymer is 28%.
Claim 6
Dependent Claim
22 words
The polymer film of claim 1, wherein the film has a tensile strength of at least 2000 psi in the machine direction.
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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) | 1997-06-13 | 1997-12-13 | 1998-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-13 | 2001-12-13 | 2002-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-13 | 2005-12-13 | 2006-06-14 | $7700.00 | Window Closed / Lapsed |