US4645796A
Expired / Lapsed
US
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Polyblends of styrene/α-methylstyrene copolymers with reinforcing interpolymerized styrene-grafted rubber concentrates
Assignee: Dow Chemical Co
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Filing: 1986-03-14
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Granted: 1987-02-24
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Expires: 2006-03-14
Abstract
Abstract Novel and particularly utile for many specific and extraordinarily-demanding applications intimately-blended admixtures of diverse synthetic resinous copolymers and graft-structured and/or the like or equivalent elastomer-based polymerizates are comprised of thoroughly intermixed products of polymerization (i.e., "polyblends") of: (i) copolymer(s) of styrene/α-methylstyrene and equivalents thereof with (ii) grafted rubber concentrates of an elastomeric substrate or backbone having thereon and thereto graft-interpolymerized styrene components therein and/or like or equivalent grafted rubber concentrate component(s). The polyblends involved exhibit superior and much-improved properties and characteristics of thermal stability, environmental stress crack resistance, hardness and so forth.
Inventors
- 👤 Douglas E. Beyer
- 👤 Edward T. Carrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:42
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L51/00; C08L51/04; Y; Y10; Y10S; Y10S525/00; Y10S525/902
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
285 words
An impact resistant and heat distortion resistant and tough polyblend composition that is comprised of an admixture of: (a) between about 40 and 95 percent by weight, based on total weight of the polyblend, of a copolymeric product of copolymerization consisting of (a') at least one isopropenyl aromatic monomer of the Formula: ##STR3## wherein Ar is an aromatic radical which includes various alkyl- and halo-ring-substituted aromatic units of from 6 to about 10 carbon atoms; in copolymered form with (a") at least one vinyl aromatic monomer of the Formula: CH═CH-AR (II) wherein Ar is an aromatic radical of the same description as that defined in connection with Formula (I) above; said copolymer containing between about 10 and about 70 mole percent based on total copolymer weight of at least one copolymerized monomer of said Formula (I); and (b) as Component (b) thereof, between about 5 and about 60 percent by weight of a shell/core graft-copolymer as a grafted rubber concentrate material for said polyblend which graft copolymer is comprised of: (b') between about 10 and about 75 weight percent in the exterior shell portion of its structure of an interpolymer of at least one monomer of the Formula: ##STR4## wherein G is selected from the group consisting of hydrogen and methyl and Ar is an aromatic radical of the same description as that defined in connection with the above Formulae (I) and (II); said shell-providing interpolymer (b') being formed upon, about and with a substrate or backbone core portion of said graft-copolymer of (b") between about 90 and about 25 weight percent of an elastomeric, graftable natural or synthetic rubber which provides the core in said graft-copolymer grafted rubber concentrate material of said Component (b).
Claim 2
Dependent Claim
285 words
An impact resistant and heat distortion resistant and tough polyblend composition that is comprised of an admixture of: (a) between about 40 and 95 percent by weight, based on total weight of the polyblend, of a copolymeric product of copolymerization consisting of (a') at least one isopropenyl aromatic monomer of the Formula: ##STR3## wherein Ar is an aromatic radical which includes various alkyl- and halo-ring-substituted aromatic units of from 6 to about 10 carbon atoms; in copolymered form with (a") at least one vinyl aromatic monomer of the Formula: CH═CH-AR (II) wherein Ar is an aromatic radical of the same description as that defined in connection with Formula (I) above; said copolymer containing between about 10 and about 70 mole percent based on total copolymer weight of at least one copolymerized monomer of said Formula (I); and (b) as Component (b) thereof, between about 5 and about 60 percent by weight of a shell/core graft-copolymer as a grafted rubber concentrate material for said polyblend which graft copolymer is comprised of: (b') between about 10 and about 75 weight percent in the exterior shell portion of its structure of an interpolymer of at least one monomer of the Formula: ##STR4## wherein G is selected from the group consisting of hydrogen and methyl and Ar is an aromatic radical of the same description as that defined in connection with the above Formulae (I) and (II); said shell-providing interpolymer (b') being formed upon, about and with a substrate or backbone core portion of said graft-copolymer of (b") between about 90 and about 25 weight percent of an elastomeric, graftable natural or synthetic rubber which provides the core in said graft-copolymer grafted rubber concentrate material of said Component (b).
Claim 3
Dependent Claim
30 words
A polyblend composition that is in accordance with that of claim 1, wherein the content of said Component (a) therein is between about 60 and about 90 percent by weight.
Claim 4
Dependent Claim
31 words
A polyblend composition that is in accordance with that of claim 1, wherein the percent by weight contents therein of both said Components (a) and (b) are about 60 and 40.
Claim 5
Dependent Claim
28 words
A polyblend composition that is in accordance with that of claim 1 wherein said copolymer (a) contains between about 20 and about 70 weight percent of copolymerizate (a').
Claim 6
Dependent Claim
35 words
A polyblend composition that is in accordance with that of claim 1, wherein said copolymer (a) has about equal weight proportions of both copolymer (a') of said Formula (I) and (a") of said Formula (II).
Claim 7
Dependent Claim
45 words
A polyblend composition that is in accordance with that of claim 1, wherein said graft-copolymer structure (b) contains between about 40 to about 60 weight percent of the interpolymer (b') in the shell portion of its structure and about 20 to 30 weight percent graft.
Claim 8
Dependent Claim
46 words
A polyblend composition that is in accordance with that of claim 1, wherein said graft-copolymer structure (b) contains about equal weight proportions of both the interpolymer (b') in the shell portion of its structure and the substrate rubber (b") in the core portion of its structure.
Claim 9
Dependent Claim
34 words
The composition of claim 1 when: the Formula (I) monomer is α-methylsytrene; both said Formulae (II) and (III) monomers are styrene; and said core (b") graftable elastomeric substrate is an essentially polybutadiene synthetic rubber.
Claim 10
Dependent Claim
34 words
The composition of claim 2 when: the Formula (I) monomer is α-methylsytrene; both said Formulae (II) and (III) monomers are styrene; and said core (b") graftable elastomeric substrate is an essentially polybutadiene synthetic rubber.
Claim 11
Dependent Claim
34 words
The composition of claim 3 when: the Formula (I) monomer is α-methylsytrene; both said Formulae (II) and (III) monomers are styrene; and said core (b") graftable elastomeric substrate is an essentially polybutadiene synthetic rubber.
Claim 12
Dependent Claim
34 words
The composition of claim 4 when: the Formula (I) monomer is α-methylsytrene; both said Formulae (II) and (III) monomers are styrene; and said core (b") graftable elastomeric substrate is an essentially polybutadiene synthetic rubber.
Claim 13
Dependent Claim
34 words
The composition of claim 5 when: the Formula (I) monomer is α-methylsytrene; both said Formulae (II) and (III) monomers are styrene; and said core (b") graftable elastomeric substrate is an essentially polybutadiene synthetic rubber.
Claim 14
Dependent Claim
34 words
The composition of claim 6 when: the Formula (I) monomer is α-methylsytrene; both said Formulae (II) and (III) monomers are styrene; and said core (b") graftable elastomeric substrate is an essentially polybutadiene synthetic rubber.
Claim 15
Dependent Claim
34 words
The composition of claim 7 when: the Formula (I) monomer is α-methylsytrene; both said Formulae (II) and (III) monomers are styrene; and said core (b") graftable elastomeric substrate is an essentially polybutadiene synthetic rubber.
Claim 16
Dependent Claim
65 words
The composition of claim 1 when: the copolymer of which said Component (a) has a weight average molecular weight is between about 50,000 and about 500,000 with an associated weight average molecular weight distribution value between about 1 and 3; and said Component (b) grafted rubber concentrate material has an average particle size in the range of from about 0.2 micron to about 6 microns.
Claim 17
Dependent Claim
62 words
The composition of claim 1 when: the copolymer of which said Component (a) has a M w of from about 100,000 to about 200,000 with an associated weight average molecular weight distribution value between about 1 and 21/2; and said Component (b) grafted rubber concentrate material has an average particle size in the range of from about 0.3 to about 2 microns.
Claim 18
Dependent Claim
28 words
As an article of manufacture, a formed plastics product that is shaped and fabricated from a polyblend composition that is in accordance with the composition of claim 1.
Claim 19
Dependent Claim
28 words
As an article of manufacture, a formed plastics product that is shaped and fabricated from a polyblend composition that is in accordance with the composition of claim 10.
Claim 20
Dependent Claim
28 words
As an article of manufacture, a formed plastics product that is shaped and fabricated from a polyblend composition that is in accordance with the composition of claim 14.
Claim 21
Dependent Claim
28 words
As an article of manufacture, a formed plastics product that is shaped and fabricated from a polyblend composition that is in accordance with the composition of claim 8.
References Cited (Backward Citations)
US4200702A
Cited
US4277574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |