Patent US4845145A successfully refreshed from Google Patents.
US4845145A
Expired / Lapsed
US
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Dynamically cured thermoplastic olefin polymers
Assignee: Advanced Elastomer Systems LP
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Filing: 1986-06-16
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Granted: 1989-07-04
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Expires: 2006-06-16
Abstract
Abstract Thermoplastic compositions of matter useful as gasketing materials as well as flexible boots and seals which are soft, have low compression set and high tensile. The compositions comprise a polyolefin resin and at least two different rubbers, one of which is vulcanized to a fully cured state by a cure system which leaves the other rubber(s) unvulcanized. The preferred embodiment comprises a blend of polypropylene and ethylene vinylacetate as the polyolefin resin component, EPDM as the uncured rubber component and a ZnO cured halogenated butyl rubber. In another embodiment of the invention, the resin is excluded and the uncured rubber is a high crystallinity EPDM.
Inventors
- 👤 Donald R. Hazelton
- 👤 Robert C. Puydak
- 👤 D. A. Booth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:05
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
68 words
A thermoplastic composition comprising a polyolefin resin, a first rubber component and a second rubber component, said second rubber component being cured utilizing a curative other than a peroxide which is a vulcanizing agent for the second rubber but not for the first rubber, said second rubber being cured to a fully vulcanized state by dynamic vulcanization in the presence of the polyolefin resin and first rubber component.
Claim 2
Dependent Claim
68 words
A thermoplastic composition comprising a polyolefin resin, a first rubber component and a second rubber component, said second rubber component being cured utilizing a curative other than a peroxide which is a vulcanizing agent for the second rubber but not for the first rubber, said second rubber being cured to a fully vulcanized state by dynamic vulcanization in the presence of the polyolefin resin and first rubber component.
Claim 3
Dependent Claim
14 words
The composition according to claim 1 wherein the polyolefin resin is polypropylene or HDPE.
Claim 4
Dependent Claim
13 words
The composition according to claim 1 wherein the first rubber is butyl rubber.
Claim 5
Dependent Claim
15 words
The composition according to claim 3 wherein the second rubber is a halogenated butyl rubber.
Claim 6
Dependent Claim
12 words
The composition according to claim 4 wherein the vulcanizing agent is ZnO.
Claim 7
Dependent Claim
14 words
The composition according to claim 1 wherein an inorganic filler material is incorporated therein.
Claim 8
Dependent Claim
15 words
The composition according to claim 6 wherein the inorganic filler is calcium carbonate or clay.
Claim 9
Dependent Claim
17 words
The composition according to claim 1 wherein the first rubber is polyisobutylene or an ethylene-propylene rubber (EPM).
Claim 10
Dependent Claim
24 words
The composition according to claim 8 wherein the second rubber is butyl rubber, polyisoprene, natural rubber, EPDM, a nitrile rubber or a styrene-butadiene rubber.
Claim 11
Dependent Claim
61 words
The composition according to claim 2 wherein the polypropylene or HDPE comprises about 25 to about 100 wt. % of the resin component based on total polyolefin resin and an optional polyolefin resin selected from the group consisting of LDPE, LLDPE, polybutylene or an ethylene copolymer resin is included at about 0 to about 75 wt. % based on total resin.
Claim 12
Dependent Claim
43 words
The composition according to claim 10 wherein the polypropylene or HDPE comprises about 45 to about 90 wt. % of the resin component and the optional resin comprises about 10 to about 55 wt. % of the resin component based on total resin.
Claim 13
Dependent Claim
12 words
The composition according to claim 2 wherein the polyolefin resin is polypropylene.
Claim 14
Dependent Claim
15 words
The composition according to claim 10 wherein the optional resin is an ethylene copolymer resin.
Claim 15
Dependent Claim
15 words
The composition according to claim 13 wherein the ethylene copolymer resin is an ethylene-vinylacetate copolymer.
Claim 16
Dependent Claim
19 words
The composition according to claim 14 wherein the ethylene-vinylacetate copolymer comprises about 3 to about 30 wt. % vinylacetate.
Claim 17
Dependent Claim
65 words
The composition according to claim 1 wherein the polyolefin comprises about 10 to about 60 wt. % of the composition based on resin plus rubber, the second rubber comprises about 6 to about 85 wt. % of the composition based on resin plus rubber and the first rubber comprises about 5 to about 80 wt. % of the composition based on the resin plus rubber.
Claim 18
Dependent Claim
26 words
The composition according to claim 16 wherein the polyolefin resin comprises about 10 to about 45 wt. % of the composition based on resin plus rubber.
Claim 19
Dependent Claim
26 words
The composition according to claim 17 wherein the polyolefin resin comprises about 12 to about 35 wt. % of the composition based on resin plus rubber.
Claim 20
Dependent Claim
26 words
The composition according to claim 16 wherein the second rubber comprises about 10 to about 80 wt. % of the composition based on resin plus rubber.
Claim 21
Dependent Claim
27 words
The composition according to claim 16 wherein the second rubber comprises about 15 to about 70 wt. % of the composition based on the resin plus rubber.
Claim 22
Dependent Claim
27 words
The composition according to claim 16 wherein the first rubber comprises about 6 to about 73 wt. % of the composition based on the resin plus rubber.
Claim 23
Dependent Claim
27 words
The composition according to claim 16 wherein the first rubber comprises about 20 to about 55 Wt. % of the composition based on the resin plus rubber.
Claim 24
Dependent Claim
16 words
The composition according to claim 1 wherein a rubber, process oil is incorporated into the composition.
Claim 25
Dependent Claim
33 words
The composition according to claim 23 wherein the oil is incorporated into the composition in an amount such that the weight ratio of oil to total rubber is about 0.3/1 to about 1/1.
Claim 26
Dependent Claim
109 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and at least two different rubbers, at least one of said rubbers being vulcanizable by a vulcanizing agent other than a peroxide which will vulcanize only one of said rubbers which comprises: (a) intimately mixing the polyolefin resin with at least one first rubber and at least one second rubber at a temperature above the softening point of the polyolefin resin; (b) adding to the intimate mixture of resin and rubber a vulcanizing agent for at least one second rubber; and (c) vulcanizing the second rubber by dynamic vulcanization for a time to fully vulcanize the second rubber.
Claim 27
Dependent Claim
109 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and at least two different rubbers, at least one of said rubbers being vulcanizable by a vulcanizing agent other than a peroxide which will vulcanize only one of said rubbers which comprises: (a) intimately mixing the polyolefin resin with at least one first rubber and at least one second rubber at a temperature above the softening point of the polyolefin resin; (b) adding to the intimate mixture of resin and rubber a vulcanizing agent for at least one second rubber; and (c) vulcanizing the second rubber by dynamic vulcanization for a time to fully vulcanize the second rubber.
Claim 28
Dependent Claim
24 words
The process according to claim 25 wherein the dynamic vulcanization is carried out at a temperature of about 120° C. to about 250° C.
Claim 29
Dependent Claim
24 words
The process according to claim 26 wherein the dynamic vulcanization is carried out at a temperature of about 180° C. to about 200° C.
Claim 30
Dependent Claim
13 words
The process according to claim 26 further including the accelerator zinc alkyl dithiocarbomate.
Claim 31
Dependent Claim
35 words
The process according to claim 25 wherein the first rubber is polyisobutylene or an ethylene-propylene rubber (EPM) and the second rubber is butyl rubber, polyisoprene, natural rubber, EPDM, a nitrile rubber or a styrenebutadiene rubber.
Claim 32
Dependent Claim
148 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and at least two rubbers, at least one of said rubbers being vulcanized by a vulcanizing agent other than a peroxide which will vulcanize at least one of said rubbers leaving at least one of said rubbers in an unvulcanized state which comprises: (a) intimately mixing the polyolefin resin with at least one first rubber at a temperature above the softening point of the polyolefin resin; (b) adding to the intimate mixture of resin and rubber a vulcanizing agent for at least one first rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully vulcanize the rubber; and (d) blending into the dynamically vulcanized rubber-polyolefin resin composition at least one second rubber which is not vulcanizable by the vulcanizing agent at a temperature above the softening point of the said rubber-polyolefin resin composition.
Claim 33
Dependent Claim
148 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and at least two rubbers, at least one of said rubbers being vulcanized by a vulcanizing agent other than a peroxide which will vulcanize at least one of said rubbers leaving at least one of said rubbers in an unvulcanized state which comprises: (a) intimately mixing the polyolefin resin with at least one first rubber at a temperature above the softening point of the polyolefin resin; (b) adding to the intimate mixture of resin and rubber a vulcanizing agent for at least one first rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully vulcanize the rubber; and (d) blending into the dynamically vulcanized rubber-polyolefin resin composition at least one second rubber which is not vulcanizable by the vulcanizing agent at a temperature above the softening point of the said rubber-polyolefin resin composition.
Claim 34
Dependent Claim
26 words
The process according to claim 30 wherein the first rubber is a halogenated rubber and the second rubber is polyisoprene, styrene-butadrene rubber or a nitrile rubber.
Claim 35
Dependent Claim
14 words
The process according to claim 30 wherein the polyolefin resin comprises polypropylene or HDPE.
Claim 36
Dependent Claim
18 words
The process according to claim 32 wherein the resin comprises a blend of polypropylene with an ethylene copolymer.
Claim 37
Dependent Claim
17 words
The process according to claim 33 wherein the ethylene copolymer is an EVA or an ethylene-methylacrylate copolymer.
Claim 38
Dependent Claim
110 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and at least two rubbers comprising: (a) intimately mixing at least one first rubber with at least one second rubber at a temperature above the softening points of said rubbers; (b) adding to the intimate mixture of rubbers a vulcanizing agent which is a vulcanizing agent for at least one first rubber but not for said second rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully cure said first rubber; and (d) blending the dynamically vulcanized rubber composition with at least one polyolefin resin at a temperature above the melting point of the resin.
Claim 39
Dependent Claim
110 words
A process for preparing a thermoplastic composition comprising a polyolefin resin and at least two rubbers comprising: (a) intimately mixing at least one first rubber with at least one second rubber at a temperature above the softening points of said rubbers; (b) adding to the intimate mixture of rubbers a vulcanizing agent which is a vulcanizing agent for at least one first rubber but not for said second rubber; (c) vulcanizing the rubber by dynamic vulcanization for a time sufficient to fully cure said first rubber; and (d) blending the dynamically vulcanized rubber composition with at least one polyolefin resin at a temperature above the melting point of the resin.
Claim 40
Dependent Claim
14 words
The process according to claim 35 wherein the polyolefin resin comprises polypropylene or HDPE.
Claim 41
Dependent Claim
19 words
The process according to claim 36 wherein the polyolefin resin comprises a blend of polypropylene with an ethylene copolymer.
Claim 42
Dependent Claim
17 words
The process according to claim 37 wherein the ethylene copolymer is an EVA or an ethylene-methylacrylate copolymer.
Claim 43
Dependent Claim
24 words
The process according to claim 35 wherein the first rubber is butyl rubber, polyisoprene, natural rubber, EPDM, a nitrile rubber or a styrenebutadiene rubber.
Claim 44
Dependent Claim
15 words
The process according to claim 39 wherein the second rubber is polyisobutylene or an EPM.
Claim 45
Dependent Claim
19 words
The composition according to claim 10 wherein the polyolefin resin is a blend of polypropylene and an ethylene copolymer.
Claim 46
Dependent Claim
17 words
The composition according to claim 41 wherein the ethylene copolymer is an EVA or an ethylene-methylacrylate copolymer.
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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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |