US4252914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic elastomer blends of hydrogenated polybutadiene block copolymers with alpha-olefin polymers and copolymers
Assignee: Bridgestone Firestone Inc
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Filing: 1979-08-20
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Granted: 1981-02-24
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Expires: 1999-08-20
Abstract
Abstract Thermoplastic elastomer blends of alpha-olefin polymers and copolymers, such as polypropylene, having a melting point of at least 90 DEG C. with hydrogenated diblock copolymers of 1,4-polybutadiene and 1,2-polybutadiene have good physical properties such as low brittle point, good impact resistance at low temperatures, minimum creep at high temperatures, good elongation, good tensile and tear strengths and good impact strength. The blends can be repeatedly processed and still maintain good physical properties. The amount of alpha-olefin polymer or copolymer in the blend may range from about 10 percent to 60 percent, preferably 15 percent to about 48 percent with the amount of the hydrogenated butadiene block copolymer correspondingly ranging from about 90 percent to about 40 percent, preferably 85 percent to about 52 percent based on the combined weight of the two components. The blends are mixed at temperatures at least as high as the melting point of the alpha-olefin polymers or copolymer.
Inventors
- 👤 Adel F. Halasa
- 👤 Davis W. Carlson
- 👤 James E. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:44
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L53/00; C08L23/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
149 words
A thermoplastic elastomer composition comprising a blend of (a) a hydrogenated diblock copolymer of butadiene having, prior to hydrogenation, one block predominantly of 1,4-polybutadiene containing no more than 15 percent by weight of 1,2-microstructure and a second block of 1,2-polybutadiene block containing at least 30 percent by weight of 1,2-microstructure, said second block representing at least 10 percent of the total molecular weight of said copolymer, the unsaturation in the original diblock copolymer being at least 85 percent hydrogenated, and (b) a polymer of at least one alpha-olefin having 2-20 carbon atoms, said alpha-olefin polymer having a melting point of at least 90° C. and having at least 45 percent crystalline structure therein; the amount of said hydrogenated diblock copolymer comprising 40-90 percent by weight and the amount of alpha-olefin polymer comprising 10-60 percent by weight, said percentages being based on the combined weight of components (a) and (b).
Claim 2
Dependent Claim
149 words
A thermoplastic elastomer composition comprising a blend of (a) a hydrogenated diblock copolymer of butadiene having, prior to hydrogenation, one block predominantly of 1,4-polybutadiene containing no more than 15 percent by weight of 1,2-microstructure and a second block of 1,2-polybutadiene block containing at least 30 percent by weight of 1,2-microstructure, said second block representing at least 10 percent of the total molecular weight of said copolymer, the unsaturation in the original diblock copolymer being at least 85 percent hydrogenated, and (b) a polymer of at least one alpha-olefin having 2-20 carbon atoms, said alpha-olefin polymer having a melting point of at least 90° C. and having at least 45 percent crystalline structure therein; the amount of said hydrogenated diblock copolymer comprising 40-90 percent by weight and the amount of alpha-olefin polymer comprising 10-60 percent by weight, said percentages being based on the combined weight of components (a) and (b).
Claim 3
Dependent Claim
17 words
The thermoplastic elastomer composition of claim 1 in which said alpha-olefin polymer is a homopolymer of propylene.
Claim 4
Dependent Claim
17 words
The thermoplastic elastomer composition of claim 1 in which said alpha-olefin polymer is a homopolymer of ethylene.
Claim 5
Dependent Claim
19 words
The thermoplastic elastomer composition of claim 1 in which said alpha-olefin polymer is a copolymer of propylene and ethylene.
Claim 6
Dependent Claim
20 words
The thermoplastic elastomer composition of claim 4 in which said copolymer comprises at least 50 percent by weight of propylene.
Claim 7
Dependent Claim
31 words
The thermoplastic elastomer composition of claim 1 in which said hydrogenated diblock copolymer is the hydrogenation product of a diblock copolymer having at least 50 percent 1,2-microstructure in said 1,2-polybutadiene block.
Claim 8
Dependent Claim
36 words
The thermoplastic elastomer composition of claim 6 in which said hydrogenated diblock copolymer is the hydrogenation product of a diblock copolymer in which the 1,2-polybutadiene block comprises at least 25 percent by weight of said diblock.
Claim 9
Dependent Claim
23 words
The thermoplastic elastomer composition of claim 7 in which said 1,4-polybutadiene block comprises at least 40 percent by weight of said diblock copolymer.
Claim 10
Dependent Claim
20 words
The thermoplastic elastomer composition of claim 1 in which said blend has a melt flow index of at least 1.0.
Claim 11
Dependent Claim
19 words
The thermoplastic elastomer of claim 1 in which said alpha-olefin polymer comprises 30-42 percent by weight of said blend.
Claim 12
Dependent Claim
16 words
The thermoplastic elastomer of claim 10 in which said alpha-olefin polymer is a homopolymer of propylene.
Claim 13
Dependent Claim
15 words
The thermoplastic elastomer of claim 11 in which said homopolymer of propylene is isotactic polypropylene.
Claim 14
Dependent Claim
27 words
The thermoplastic elastomer of claim 10 in which said alpha-olefin polymer is a copolymer of propylene and ethylene containing at least 50 percent by weight of propylene.
Claim 15
Dependent Claim
38 words
The process for making the thermoplastic elastomer composition of claim 1 comprising the steps of: (1) mixing said alpha-olefin polymer and said hydrogenated polybutadiene polymer and (2) heating said mixture at a temperature of at least 90° C.
Claim 16
Dependent Claim
18 words
The process of claim 14 in which said blend has a melt flow index of at least 1.0.
References Cited (Backward Citations)
US3985826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |