US4397988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of p-methylstyrene polymer and diene-styrene or diene-(p-methylstyrene) block copolymers
Assignee: Mobil Oil AS
•
Filing: 1982-04-22
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Granted: 1983-08-09
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Expires: 2002-04-22
Abstract
Abstract Blends of conjugated diene-styrene or diene-(p-methylstyrene) block copolymers and polymers of p-methylstyrene. The blends exhibit excellent physical and optical properties.
Inventors
- 👤 Anthony M. Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:01
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/16; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
148 words
A polymer blend comprising A. 10 to 90 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer; and B. 90 to 10 parts by weight of a block copolymer of a conjugated diene and either styrene or methyl styrene, but not both, which block copolymer is selected from the group consisting of a block copolymer of greater than 40 to 60 weight % of a conjugated diene and from 40 to less than 60 weight % styrene; a block copolymer of 10 to less than 20 weight % of a conjugated diene and from greater than 80 to 90 weight % styrene; and a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % methylstyrene isomers having a para content of at least 90%.
Claim 2
Dependent Claim
148 words
A polymer blend comprising A. 10 to 90 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer; and B. 90 to 10 parts by weight of a block copolymer of a conjugated diene and either styrene or methyl styrene, but not both, which block copolymer is selected from the group consisting of a block copolymer of greater than 40 to 60 weight % of a conjugated diene and from 40 to less than 60 weight % styrene; a block copolymer of 10 to less than 20 weight % of a conjugated diene and from greater than 80 to 90 weight % styrene; and a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % methylstyrene isomers having a para content of at least 90%.
Claim 3
Dependent Claim
88 words
A polymer blend comprising A. 10 to less than 40 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer; and B. 90 to greater than 60 parts by weight of a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % of either styrene or methylstyrene isomers, but not both, in which said methyl styrene isomers have a para content of at least 90%.
Claim 4
Dependent Claim
88 words
A polymer blend comprising A. 10 to less than 40 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer; and B. 90 to greater than 60 parts by weight of a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % of either styrene or methylstyrene isomers, but not both, in which said methyl styrene isomers have a para content of at least 90%.
Claim 5
Dependent Claim
23 words
The polymer blend of claim 1 having lower haze and higher optical transmission than the corresponding blend in which (A) is sytrene polymer.
Claim 6
Dependent Claim
15 words
The polymer blend of claim 1 in which (B) is a block copolymer containing styrene.
Claim 7
Dependent Claim
15 words
The polymer blend of claim 1 in which (B) is a block copolymer containing para-methylstyrene.
Claim 8
Dependent Claim
16 words
The blend of claim 1 in which (A) is a polymer consisting of polymerized methylstyrene isomers.
Claim 9
Dependent Claim
17 words
An article made by forming a sheet from the blend of claim 1 and thermoforming the article.
Claim 10
Dependent Claim
23 words
The polymer blend of claim 2 having lower haze and higher optical transmission than the corresponding blend in which (A) is styrene polymer.
Claim 11
Dependent Claim
15 words
The polymer blend of claim 2 in which (B) is a block copolymer containing styrene.
Claim 12
Dependent Claim
15 words
The polymer blend of claim 2 in which (B) is a block copolymer containing para-methylstyrene.
Claim 13
Dependent Claim
16 words
The blend of claim 2 in which (A) is a polymer consisting of polymerized methylstyrene isomers.
Claim 14
Dependent Claim
17 words
An article made by forming a sheet from the blend of claim 2 and thermoforming the article.
Claim 15
Dependent Claim
88 words
A polymer blend comprising A. greater than 70 to 90 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer; and B. less than 30 to 10 parts by weight of a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % of either styrene or methylstyrene isomers, but not both, in which said methyl styrene isomers have a para content of at least 90%.
Claim 16
Dependent Claim
88 words
A polymer blend comprising A. greater than 70 to 90 parts by weight of a polymer comprising polymerized methylstyrene isomers as its major constituent in which the methylstyrene isomers include at least 90% of the para isomer; and B. less than 30 to 10 parts by weight of a block copolymer of 10 to 60 weight % conjugated diene, and 40 to 90 weight % of either styrene or methylstyrene isomers, but not both, in which said methyl styrene isomers have a para content of at least 90%.
Claim 17
Dependent Claim
23 words
The polymer blend of claim 13 having lower haze and higher optical transmission than the corresponding blend in which (A) is styrene polymer.
Claim 18
Dependent Claim
15 words
The polymer blend of claim 13 in which (B) is a block copolymer containing styrene.
Claim 19
Dependent Claim
15 words
The polymer blend of claim 13 in which (B) is a block copolymer containing para-methylstyrene.
Claim 20
Dependent Claim
16 words
The blend of claim 13 in which (A) is a polymer consisting of polymerized methylstyrene isomers.
Claim 21
Dependent Claim
17 words
An article made by forming a sheet from the blend of claim 13 and thermoforming the article.
References Cited (Backward Citations)
US4255531A
Cited
US4275179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-08 | 1987-02-07 | 1987-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-08 | 1991-02-07 | 1991-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-08 | 1995-02-07 | 1995-08-09 | $7700.00 | Window Closed / Lapsed |