US4039629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymer blends
Assignee: Shell USA Inc
•
Filing: 1977-02-11
•
Granted: 1977-08-02
•
Expires: 1997-02-11
Abstract
Abstract Block copolymer blends exhibiting improved (reduced) delamination characteristics comprise 65-90 parts of certain block copolymers having an average total molecular weight of 130,000 - 250,000 with a monoalkenyl arene block mol. wt. of 20,000 - 30,000 blended with 35-10 parts of a second block polymer having an average total molecular weight between about 60,000 and 100,000 with a monoalkenyl arene block mol. wt. between about 5,000 and 15,000.
Inventors
- 👤 Glenn R. Himes
- 👤 Luis Enrique Mendoza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:06
CPC Classifications
C; C08; C08L; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
An unvulcanized block copolymer composition suitable for the manufacture of shoe heels comprising: a. 65 to 90 parts by weight of a first block copolymer having an average total molecular weight between about 170,000 and 210,000 and a monoalkenyl arene block mol. wt. between about 20,000 and 30,000; and b. 35 to 10 parts by weight of a second block copolymer having an average total molecular weight between about 70,000 and 90,000 and a monoalkenyl arene block mol. wt. between about 5,000 and 15,000; both of said block copolymers having at least two monoalkenyl arene polymer blocks and at least one conjugated diene polymer block and both of said block copolymers not having been hydrogenated.
Claim 2
Dependent Claim
115 words
An unvulcanized block copolymer composition suitable for the manufacture of shoe heels comprising: a. 65 to 90 parts by weight of a first block copolymer having an average total molecular weight between about 170,000 and 210,000 and a monoalkenyl arene block mol. wt. between about 20,000 and 30,000; and b. 35 to 10 parts by weight of a second block copolymer having an average total molecular weight between about 70,000 and 90,000 and a monoalkenyl arene block mol. wt. between about 5,000 and 15,000; both of said block copolymers having at least two monoalkenyl arene polymer blocks and at least one conjugated diene polymer block and both of said block copolymers not having been hydrogenated.
Claim 3
Dependent Claim
24 words
A composition according to claim 1 wherein the first block copolymer is present in an amount between about 75 and 85 parts by weight.
Claim 4
Dependent Claim
24 words
A composition according to claim 1 wherein the second block copolymer is present in an amount between about 25 to 15 parts by weight.
Claim 5
Dependent Claim
22 words
A composition according to claim 1 wherein the first block copolymer has a styrene block mol. wt. between about 23,000 and 27,000.
Claim 6
Dependent Claim
22 words
A composition according to claim 1 wherein the second block copolymer has a styrene block mol. wt. between about 8,000 and 12,000.
Claim 7
Dependent Claim
41 words
A composition according to claim 1 comprising in addition 25-150 parts by weight, per 100 parts of block copolymers, of a thermoplastic polymer of the group consisting of polystyrene, poly (alphamethylstyrene), poly (alpha olefins) and copolymers of ethylene with vinyl acetate.
Claim 8
Dependent Claim
23 words
A composition according to claim 1 comprising in addition 10-50 parts by weight per 100 parts of block copolymers, of an extending oil.
Claim 9
Dependent Claim
85 words
An extrudable composition according to claim 1 comprising ______________________________________
Parts by weight
______________________________________
a) a first block copolymer of styrene and
75-85
butadiene having an average total mole-
cular weight between 170,000 and 210,000
and a styrene block mol. wt. of 23,000-
27,000;
b) a second block copolymer of styrene and
15-25
butadiene having an average total mole-
cular weight between 70,000 and 90,000
and a styrene block mol. wt. of 8,000-
12,000;
c) Polystyrene 75-125
d) Naphthenic oil extender 15-35
e) Antioxidant 0.5-1.5
______________________________________
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |