US4489187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-resistant blends of polypropylene, conjugated diene/monovinylarene rubbery block copolymers, with an in-situ cured polychloroprene
Assignee: Phillips Petroleum Co
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Filing: 1984-02-29
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Granted: 1984-12-18
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Expires: 2004-02-29
Abstract
Abstract The loss in tensile of a polypropylene blend with a conjugated diene/monovinylarene rubbery block copolymer can be prevented by including in the blend an effective amount of a polychloroprene, followed by curing the composition with a curative which cures substantially only the polychloroprene component.
Inventors
- 👤 Terence C. Middlebrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:07
CPC Classifications
C; C08; C08L; C08L11/00; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/044; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L53/00; C08L53/02; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
35 words
A polymer blend comprising effective ratios to maintain stability at high temperature aging of a polypropylene, a conjugated diene/monovinylarene rubbery block copolymer, a polychloroprene, and a curative effective to cure substantially only the polychloroprene component.
Claim 2
Dependent Claim
35 words
A polymer blend comprising effective ratios to maintain stability at high temperature aging of a polypropylene, a conjugated diene/monovinylarene rubbery block copolymer, a polychloroprene, and a curative effective to cure substantially only the polychloroprene component.
Claim 3
Dependent Claim
23 words
The polymer blend according to claim 1 wherein said polypropylene has a nominal melt flow in the range of about 1 to 20.
Claim 4
Dependent Claim
23 words
The polymer blend according to claim 2 wherein said polychloroprene has a Mooney viscosity in the range of about 35 to 65 ML-4.
Claim 5
Dependent Claim
38 words
The polymer blend according to claim 3 containing about 20 to 60 weight percent polypropylene, about 20 to 60 weight percent conjugated diene/monovinylarene rubbery block copolymer, and about 10 to 30 weight percent polychloroprene, exclusive of other additives.
Claim 6
Dependent Claim
66 words
The polymer blend according to claim 4 wherein said conjugated diene/monovinylarene rubbery block copolymer is characterized by a structure represented by A-B-A or (AB-) n Y wherein A represents a block of polymerized monovinylarene monomer, B a block of polymerized conjugated diene monomer, and Y a residual unit of a polyfunctional coupling agent or polyfunctional initiator, and n is an integer of 2 to 6 inclusive.
Claim 7
Dependent Claim
30 words
The polymer blend according to claim 5 wherein said conjugated diene contains 4 to 8 carbon atoms per molecule, and said monovinylarene contains 8 to 12 carbon atoms per molecule.
Claim 8
Dependent Claim
39 words
The polymer blend according to claim 6 containing about 30 to 50 weight percent substantially crystalline polypropylene, about 30 to 50 weight percent rubbery block copolymer, and about 75 to 25 weight percent polychloroprene, based on weights of polymers.
Claim 9
Dependent Claim
18 words
The polymer blend according to claim 7 wherein said conjugated diene is butadiene, and said monovinylarene is styrene.
Claim 10
Dependent Claim
44 words
The composition according to claim 8 employing a 70/30 butadiene/styrene rubbery block copolymer, a polypropylene having a nominal melt flow of about 12, a polychloroprene having an ML-4 of about 37-61, and a polychloroprene curing system comprising zinc dibutyldithiocarbamate, zinc oxide, and magnesium oxide.
Claim 11
Dependent Claim
38 words
A cured polymer blend comprising effective ratios to maintain stability at high temperature aging of polypropylene, a conjugated diene/monovinylarene rubbery block copolymer, and polychloroprene, cured with a curative system effective to substantially cure in situ only said polychloroprene.
Claim 12
Dependent Claim
38 words
A cured polymer blend comprising effective ratios to maintain stability at high temperature aging of polypropylene, a conjugated diene/monovinylarene rubbery block copolymer, and polychloroprene, cured with a curative system effective to substantially cure in situ only said polychloroprene.
Claim 13
Dependent Claim
24 words
The cured polymer blend according to claim 10 wherein said polypropylene has a nominal melt flow in the range of about 4 to 20.
Claim 14
Dependent Claim
24 words
The cured polymer blend according to claim 11 wherein said neoprene has a Mooney viscosity in the range of about 35 to 65 ML-4.
Claim 15
Dependent Claim
41 words
The cured polymer blend according to claim 12 containing about 20 to 60 weight percent polypropylene, about 20 to 60 weight percent conjugated diene/monovinylarene rubbery block copolymer, and about 10 to 30 weight percent polychloroprene, based on total weight of polymer.
Claim 16
Dependent Claim
67 words
The cured polymer blend according to claim 13 wherein said conjugated diene/monovinylarene rubbery block copolymer is characterized by a structure represented by A-B-A or (AB-) n Y wherein A represents a block of polymerized monovinylarene monomer, B a block of polymerized conjugated diene monomer, and Y a residual unit of a polyfunctional coupling agent or polyfunctional initiator, and n is an integer of 2 to 6 inclusive.
Claim 17
Dependent Claim
31 words
The cured polymer blend according to claim 14 wherein said conjugated diene contains 4 to 8 carbon atoms per molecule, and said monovinylarene contains 8 to 12 carbon atoms per molecule.
Claim 18
Dependent Claim
40 words
The cured polymer blend according to claim 15 containing about 30 to 50 weight percent substantially crystalline polypropylene, about 30 to 50 weight percent rubbery block copolymer, and about 75 to 25 weight percent polychloroprene, based on weights of polymers.
Claim 19
Dependent Claim
19 words
The cured polymer blend according to claim 16 wherein said conjugated diene is butadiene, and said monovinylarene is styrene.
Claim 20
Dependent Claim
58 words
The cured polymer blend according to claim 17 employing a 70/30 butadiene/styrene rubbery block copolymer, a substantially crystalline polypropylene homopolymer having a nominal melt flow of about 12, a polychloroprene having an ML-4 of about 37-61, wherein the polychloroprene component was cured in situ after blending the polymers with a zinc dibutyldithiocarbamate, zinc oxide, magnesium oxide curing system.
Claim 21
Dependent Claim
10 words
A molded article of the cured blend of claim 10.
Claim 22
Dependent Claim
10 words
A molded article of the cured blend of claim 18.
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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) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |