US4067942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of resinous block copolymer to improve clarity
Assignee: Phillips Petroleum Co
•
Filing: 1976-02-23
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Granted: 1978-01-10
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Expires: 1996-02-23
Abstract
Abstract Extruded articles of resinous transparent monovinyl-substituted aromatic compound/conjugated diene block copolymer are subjected to a brief heat treatment which results in a substantial improvement in clarity.
Inventors
- 👤 Newton R. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:16
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/08; B; B29; B29C; B29C71/00; B29C71/02; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29C35/04; B29C35/045; B29K; B29K2995/00; B29K2995/0018; B29K2995/0026; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
79 words
A process for producing a transparent extrudate comprising: forming a molten extrudate of a resinous transparent monovinyl-substituted aromatic compound/conjugated diene block copolymer having terminal blocks of said monovinyl-substituted aromatic compound, such extrudate being at least about 10 mils thick; cooling said extrudate to a solid state; and then applying heat to a surface of the thus-solidified extrudate for a short time so as to melt only a thin surface layer, thereby increasing clarity without visible distortion of the extrudate.
Claim 2
Dependent Claim
79 words
A process for producing a transparent extrudate comprising: forming a molten extrudate of a resinous transparent monovinyl-substituted aromatic compound/conjugated diene block copolymer having terminal blocks of said monovinyl-substituted aromatic compound, such extrudate being at least about 10 mils thick; cooling said extrudate to a solid state; and then applying heat to a surface of the thus-solidified extrudate for a short time so as to melt only a thin surface layer, thereby increasing clarity without visible distortion of the extrudate.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein said resinous copolymer is a resinous block copolymer of butadiene and styrene.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein the weight ratio of said monovinyl-substituted aromatic compound to said conjugated diene is within the range of 70:30 to 85:15.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein the time for said treatment is within the range of 0.25 to 0.4 second.
Claim 6
Dependent Claim
14 words
A method according to claim 1 wherein said heat is provided by a flame.
Claim 7
Dependent Claim
24 words
A method according to claim 1 wherein a wall thickness of said extrudate is within the range of about 10 to about 500 mils.
Claim 8
Dependent Claim
12 words
A method according to claim 1 wherein said extrudate is a tubing.
Claim 9
Dependent Claim
17 words
A method according to claim 7 wherein the treatment is carried out on the outer surface thereof.
Claim 10
Dependent Claim
23 words
A method according to claim 8 wherein said treatment is carried out for a time within the range of 0.25 to 0.4 second.
Claim 11
Dependent Claim
25 words
A method according to claim 9 wherein said extrudate is passed through a flame at a linear velocity of 12 to 20 feet per minute.
Claim 12
Dependent Claim
29 words
A method according to claim 10 wherein said copolymer is a copolymer of styrene and butadiene having a weight ratio of styrene:butadiene within the range of 70:30 to 85:15.
Claim 13
Dependent Claim
11 words
A process according to claim 1 wherein said copolymer is linear.
Claim 14
Dependent Claim
11 words
A process according to claim 1 wherein said copolymer is radial.
Claim 15
Dependent Claim
22 words
A process according to claim 1 wherein said time of said treatment is within the range of 0.01 second to 1 second.
Claim 16
Dependent Claim
29 words
A process according to claim 1 wherein the weight ratio of said monovinyl-substituted aromatic compound to said conjugated diene is within the range of about 70:30 to about 95:5.
Claim 17
Dependent Claim
31 words
A process according to claim 10 wherein said copolymer is a copolymer of styrene and butadiene having a weight ratio of styrene:butadiene within the range of about 70:30 to about 95:5.
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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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |