US4783301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polybutene molded article and method for making same
Assignee: Dow Chemical Co
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Filing: 1986-10-30
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Granted: 1988-11-08
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Expires: 2006-10-30
Abstract
Abstract The specification discloses a polybutene-1 polymer product and method and apparatus for making same in which the polymer is introduced into a form which defines the shape of the desired part and is then subjected to shear at a temperature from just above to just below the melting point of the polybutene-1 polymer, achieved by positioning the polymer blend between a shell and a mandrel and rotating the two relative to one another. When the viscosity of the polymer reaches a maximum, the part solidified and removed for subsequent use.
Inventors
- 👤 Kuo Z. Hong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:26
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C45/56; B29C45/5605; B29C48/00; B29C48/03; B29C48/09; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C67/00; B29C67/0003; B29C48/07; B29C48/08; B29K; B29K2023/00; B29K2023/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
134 words
A method for producing a polybutene-1 polymer product comprising: forming a melt of polymeric material comprising polybutene-1 at a temperature above the melting point of polybutene-1; introducing said melt of polymeric material comprising polybutene-1 into a form defining the desired shape; cooling said melt of polymeric material comprising polybutene-1 to a temperature in the range from just above the melting point to just below the melting point of said polybutene-1 polymer; subjecting said melt of polymeric material to a generally uniform and constant rotational shear in said form within said temperatrure range from just above to just below the melting point of said polybutene-1 polymer to induce crystallization thereof; discontinuing rotational shear while said melt of polymeric material is at a temperature within said range of temperature; and allowing said polymeric material to harden.
Claim 2
Independent Claim
134 words
A method for producing a polybutene-1 polymer product comprising: forming a melt of polymeric material comprising polybutene-1 at a temperature above the melting point of polybutene-1; introducing said melt of polymeric material comprising polybutene-1 into a form defining the desired shape; cooling said melt of polymeric material comprising polybutene-1 to a temperature in the range from just above the melting point to just below the melting point of said polybutene-1 polymer; subjecting said melt of polymeric material to a generally uniform and constant rotational shear in said form within said temperatrure range from just above to just below the melting point of said polybutene-1 polymer to induce crystallization thereof; discontinuing rotational shear while said melt of polymeric material is at a temperature within said range of temperature; and allowing said polymeric material to harden.
Claim 3
Dependent Claim
22 words
The method of claim 1 in which said shear of said polybutene-1 polymer is discontinued when its viscosity reaches its maximum value.
Claim 4
Dependent Claim
22 words
The method of claim 2 in which said shearing is conducted at a shear rate of less than 11 sec. -1 .
Claim 5
Dependent Claim
22 words
The method of claim 3 in which said shearing step is conducted at a shear rate of about 4 sec. -1 .
Claim 6
Dependent Claim
24 words
The method of claim 4 in which said shearing is conducted when said polymer is at a temperature of between 120° and 126° C.
Claim 7
Dependent Claim
22 words
The method of claim 5 in which said shearing is conducted when said polymer is at a temperature of about 122° C.
Claim 8
Dependent Claim
33 words
The method of claim 1 in which said form comprises a cylindrical mandrel rotatably mounted within a shell; said shear being created by rotating said cylindrical mandrel and shell relative to one another.
Claim 9
Dependent Claim
70 words
The method of claim 7 in which the inner surface of said shell abuts the exterior surface of said mandrel except in the space defined by a spiral track in said inner wall of said shell, extending generally from one end of said shell to the other; and said method including forcing said polymer through said spiral track as said mandrel and said shell are rotated relative to one another.
Claim 10
Dependent Claim
22 words
The method of claim 8 in which said shearing is conducted at a shear rate of less, than 11 sec. -1 .
Claim 11
Dependent Claim
22 words
The method of claim 9 in which said shearing step is conducted at a shear rate of about 4 sec. -1 .
Claim 12
Dependent Claim
21 words
The method of claim 10 in which said shear of said polymer is discontinued when its viscosity reaches its maximum value.
Claim 13
Dependent Claim
22 words
The method of claim 1 in which said shearing is conducted at a shear rate of less than 11 sec. -1 .
Claim 14
Dependent Claim
22 words
The method of claim 12 in which said shearing step is conducted at a shear rate of about 4 sec. -1 .
Claim 15
Dependent Claim
16 words
The method of claim 14 in which up to 50% polystyrene is blended with said polybutene-1.
Claim 16
Dependent Claim
14 words
The method of claim 14 in which 10% polystyrene is blended with said polybutene-1.
Claim 17
Dependent Claim
24 words
The method of claim 15 in which said shearing is conducted when said polymer is at a temperature of between 120° and 126° C.
Claim 18
Dependent Claim
22 words
The method of claim 16 in which said shearing is conducted when said polymer is at a temperature of about 122° C.
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |