US5320899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic block copolymer films
Assignee: Kraton Polymers US LLC
•
Filing: 1993-10-12
•
Granted: 1994-06-14
•
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 06:10
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.
References Cited (Backward Citations)
DE1902228A1
Cited
US3629387A
Cited
US3980736A
Cited
US3947536A
Cited
US4070418A
Cited
GB1341922A
Cited
US3865776A
Cited
US3994439A
Cited
US4017436A
Cited
JPS5171363A
Cited
US4082877A
Cited
US4006116A
Cited
JPS553409A
Cited
US4216131A
Cited
US4367312A
Cited
JPS5798544A
Cited
US4386188A
Cited
US4377658A
Cited
US4457960A
Cited
JPS58204037A
Cited
US4476180A
Cited
US4565720A
Cited
JPS61221258A
Cited
US4701367A
Cited
EP0254346A2
Cited
US5068138A
Cited
US4977014A
Cited
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 |