US4476180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonblocking elastomeric polymer blends of ABA block copolymer and ethylene-vinyl acetate copolymer
Assignee: Procter and Gamble Co
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Filing: 1983-02-01
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Granted: 1984-10-09
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Expires: 2003-02-01
Abstract
Abstract Thermoplastic elastomeric films comprise from about 40% to about 80% of an elastomeric block copolymer and from about 20% to about 60% of an ethylene-vinyl acetate copolymer. The block copolymer has at least two monoalkenyl arene polymer end blocks and at least one elastomeric conjugated diene midblock. The monoalkenyl arene polymer blocks comprise from about 8% to about 55% by weight of the block copolymer. The block copolymer has a melt index of less than about 10. The ethylene-vinyl acetate copolymer comprises from about 22% to about 33% vinyl acetate and has a melt index of less than about 0.6. The film is from about 0.03 mm to about 0.15 mm in thickness.
Inventors
- 👤 Andrew J. Wnuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:49
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; B; B29; B29D; B29D7/00; B29D7/01; C08J; C08J5/00; C08J5/18; C08L53/00; C08L53/02; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08L2205/00; C08L2205/03; C08L23/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
114 words
An elastomeric film comprising: (a) from about 40% to about 80% of an elastomeric block copolymer having at least two monoalkenyl arene polymer end blocks A and at least one elastomeric conjugated diene mid block D, said blocks A comprising from about 8% to about 55% by weight of said block copolymer, said block copolymer having a melt index of less than about 10; and (b) from about 20% to about 60% of an ethylene-vinyl acetate copolymer, said ethylene-vinyl acetate copolymer comprising from about 22% to about 33% vinyl acetate and having a melt index of less than about 0.6; where said film is from about 0.03 mm to about 0.15 mm in thickness.
Claim 2
Dependent Claim
114 words
An elastomeric film comprising: (a) from about 40% to about 80% of an elastomeric block copolymer having at least two monoalkenyl arene polymer end blocks A and at least one elastomeric conjugated diene mid block D, said blocks A comprising from about 8% to about 55% by weight of said block copolymer, said block copolymer having a melt index of less than about 10; and (b) from about 20% to about 60% of an ethylene-vinyl acetate copolymer, said ethylene-vinyl acetate copolymer comprising from about 22% to about 33% vinyl acetate and having a melt index of less than about 0.6; where said film is from about 0.03 mm to about 0.15 mm in thickness.
Claim 3
Dependent Claim
10 words
The film of claim 1 wherein said film is thermoplastic.
Claim 4
Dependent Claim
27 words
The film of claim 2 wherein said monoalkenyl arene polymer is polystyrene and said conjugated diene polymer is selected from a group consisting of polybutadiene and polyisoprene.
Claim 5
Dependent Claim
12 words
The film of claim 3 wherein said conjugated diene polymer is polybutadiene.
Claim 6
Dependent Claim
16 words
The film of claim 4 wherein said elastomeric block copolymer is a linear triblock copolymer A-D-A.
Claim 7
Dependent Claim
21 words
The film of claim 2 wherein said film further comprises: (c) from about 10% to about 30% of an antiblock concentrate.
Claim 8
Dependent Claim
21 words
The film of claim 5 wherein said film further comprises: (c) from about 10% to about 30% of an antiblock concentrate.
Claim 9
Dependent Claim
16 words
The film of claim 7 wherein said antiblock concentrate is a blend of polyethylene and silica.
Claim 10
Dependent Claim
17 words
The film of claim 8 wherein said antiblock concentrate contains about 50% polyethylene and about 50% silica.
Claim 11
Dependent Claim
32 words
The film of claim 5 wherein said film comprises from about 40% to about 60% of said elastomeric block copolymer and from about 20% to about 50% of said ethylene-vinyl acetate copolymer.
Claim 12
Dependent Claim
32 words
The film of claim 7 wherein said film comprises from about 40% to about 60% of said elastomeric block copolymer and from about 20% to about 50% of said ethylene-vinyl acetate copolymer.
Claim 13
Dependent Claim
19 words
The film of claim 5 wherein the melt index of said ethylene-vinyl acetate copolymer is less than about 0.4.
Claim 14
Dependent Claim
19 words
The film of claim 11 wherein the melt index of said ethylene-vinyl acetate copolymer is less than about 0.4.
Claim 15
Dependent Claim
17 words
The film of claim 11 wherein the melt index of said ethylene-vinyl acetate copolymer is about 0.3.
Claim 16
Dependent Claim
19 words
The film of claim 5 wherein said film is from about 0.04 mm to about 0.08 mm in thickness.
Claim 17
Dependent Claim
19 words
The film of claim 11 wherein said film is from about 0.04 mm to about 0.08 mm in thickness.
Claim 18
Dependent Claim
19 words
The film of claim 13 wherein said film is from about 0.04 mm to about 0.08 mm in thickness.
Claim 19
Dependent Claim
17 words
The film of claim 5 wherein said elastomeric block copolymer has a melt index of about 7.
Claim 20
Dependent Claim
17 words
The film of claim 14 wherein said elastomeric block copolymer has a melt index of about 7.
Claim 21
Dependent Claim
17 words
The film of claim 17 wherein said elastomeric block copolymer has a melt index of about 7.
Claim 22
Dependent Claim
18 words
The film of claim 5 wherein the vinyl acetate content of said ethylene-vinyl acetate copolymer is about 28%.
Claim 23
Dependent Claim
18 words
The film of claim 14 wherein the vinyl acetate content of said ethylene-vinyl acetate copolymer is about 28%.
Claim 24
Dependent Claim
18 words
The film of claim 20 wherein the vinyl acetate content of said ethylene-vinyl acetate copolymer is about 28%.
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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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |