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Patent US4977014A successfully refreshed from Google Patents.
US4977014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic block copolymer films
Assignee: Kraton Polymers US LLC
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Filing: 1989-08-22
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Granted: 1990-12-11
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Expires: 2009-08-22
Abstract
Abstract The properties of polymer films which contain thermoplastic block copolymer compositions and ethylene/vinyl acetate copolymers are improved by the addition of small amounts of polystyrene. Specific improvements have been made in elastically and tensile strength as well as in reduced die build-up during processing.
Inventors
- 👤 Neil F. Mitchell
- 👤 Lie K. Djiauw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:30
CPC Classifications
C; C08; C08L; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A polymer film having a thickness of between about 0.5 mils and 10 mils, made from a polymer blend composition having a melt index of less than 12 as determined by ASTM method 1238, condition E comprising: about 40% to about 80% of a thermoplastic block copolymer of a monoalkenylarene and an unsaturated butadiene, containing up to about one-third porocessing oil by weight; about 15% to about 40% of an ethylene/vinyl acetate copolymer having a vinyl acetate content between 12% and 33%; and 10 to 45 parts polystyrene per hundred parts of the block copolymer.
Claim 2
Dependent Claim
95 words
A polymer film having a thickness of between about 0.5 mils and 10 mils, made from a polymer blend composition having a melt index of less than 12 as determined by ASTM method 1238, condition E comprising: about 40% to about 80% of a thermoplastic block copolymer of a monoalkenylarene and an unsaturated butadiene, containing up to about one-third porocessing oil by weight; about 15% to about 40% of an ethylene/vinyl acetate copolymer having a vinyl acetate content between 12% and 33%; and 10 to 45 parts polystyrene per hundred parts of the block copolymer.
Claim 3
Dependent Claim
22 words
The polymer film of claim 1, wherein the thermoplastic block copolymer is a blend of a polystyrene-butadiene-polystyrene block copolymer and an oil.
Claim 4
Dependent Claim
20 words
The polymer film of claim 2, wherein the thermoplastic block copolymer is KRATON® D4150 or KRATON® D2104 block copolymer composition.
Claim 5
Dependent Claim
27 words
The polymer film of claim 3, wherein the ethylene/vinyl acetate copolymer has a melt index less than 3 as determined by ASTM Method D 1238, Condition B.
Claim 6
Dependent Claim
13 words
The polymer film of claim 4, wherein the vinyl acetate content is 15-20%.
Claim 7
Dependent Claim
63 words
A polymer film having a thickness of between about 0.5 mils and 10 mils, comprising: about 65% of KRATON® D4150 or KRATON® D2104 block copolymer about 20% of an ehtylene/vinyl acetate copolymer having a vinyl acetate content of 15-20%; and about 10% of polystyrene; the film composition having a melt index less than 12 as determined by ASTM Method D 1238, Condition E.
Claim 8
Dependent Claim
63 words
A polymer film having a thickness of between about 0.5 mils and 10 mils, comprising: about 65% of KRATON® D4150 or KRATON® D2104 block copolymer about 20% of an ehtylene/vinyl acetate copolymer having a vinyl acetate content of 15-20%; and about 10% of polystyrene; the film composition having a melt index less than 12 as determined by ASTM Method D 1238, Condition E.
Claim 9
Dependent Claim
18 words
The polymer film of claim 6, wherein the melt index of the film composition is less than 6.
Claim 10
Dependent Claim
18 words
The polymer film of claim 1 wherein the thickness is between about 1 mil and about 6 mils.
Claim 11
Dependent Claim
17 words
The polymer film of claim 1 wherein the thickness is between about 1 mil and 4 mils.
Claim 12
Dependent Claim
18 words
The polymer film of claim 6 wherein the thickness is between about 1 mil and about 6 mils.
Claim 13
Dependent Claim
17 words
The polymer film of claim 6 wherein the thickness is between about 1 mil and 4 mils.
References Cited (Backward Citations)
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Cited
US3980736A
Cited
GB1341922A
Cited
US3994439A
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US4367312A
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JPS5798544A
Cited
US4476180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |