Patent US4607074A successfully refreshed from Google Patents.
US4607074A
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US
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Dynamically cured thermoplastic olefin polymers
Assignee: Advanced Elastomer Systems LP
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Filing: 1984-07-11
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Granted: 1986-08-19
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Expires: 2004-07-11
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
2026-10-25 08:55
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02
Claims Analysis
Total Claims: 53
Claim 1
Independent Claim
93 words
A thermoplastic composition comprising a polyolefin resin, a first rubber component selected from the group consisting of polyisobutylene, and ethylene propylene copolymer (EPM) and EPDM and a second rubber component selected from the group consisting of halogenated butyl rubber and polychoroprene, 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 compound.
Claim 2
Dependent Claim
93 words
A thermoplastic composition comprising a polyolefin resin, a first rubber component selected from the group consisting of polyisobutylene, and ethylene propylene copolymer (EPM) and EPDM and a second rubber component selected from the group consisting of halogenated butyl rubber and polychoroprene, 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 compound.
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 an EPDM.
Claim 5
Dependent Claim
21 words
The composition according to claim 3 wherein the second rubber is a halogenated butyl rubber and the vulcanizing agent comprises ZnO.
Claim 6
Dependent Claim
19 words
The composition according to claim 4 wherein the halogenated butyl rubber is chlorinated butyl rubber or brominated butyl rubber.
Claim 7
Dependent Claim
12 words
The composition according to claim 5 wherein the vulcanizing agent is ZnO.
Claim 8
Dependent Claim
13 words
The composition according to claim 6 wherein a dialkyl dithio carbamate is included.
Claim 9
Dependent Claim
14 words
The composition according to claim 1 wherein an inorganic filler material is incorporated therein.
Claim 10
Dependent Claim
15 words
The composition according to claim 8 wherein the inorganic filler is calcium carbonate or clay.
Claim 11
Dependent Claim
17 words
The composition according to claim 1 wherein the first rubber is polyisobutylene or an ethylene-propylene rubber (EPM).
Claim 12
Dependent Claim
59 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 13
Dependent Claim
41 words
The composition according to claim 11 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 14
Dependent Claim
12 words
The composition according to claim 2 wherein the polyolefin resin is polypropylene.
Claim 15
Dependent Claim
15 words
The composition according to claim 11 wherein the optional resin is an ethylene copolymer resin.
Claim 16
Dependent Claim
15 words
The composition according to claim 14 wherein the ethylene copolymer resin is an ethylene-vinylacetate copolymer.
Claim 17
Dependent Claim
37 words
The composition according to claim 2 wherein the polypropylene comprises less than 10 wt% of the composition and the first rubber is an EPDM having as crystallinity as measured by x-ray diffraction of at least 2 wt%.
Claim 18
Dependent Claim
17 words
The composition according to claim 16 wherein the EPDM has a crystallinity of at least 8 wt%.
Claim 19
Dependent Claim
18 words
The composition according to claim 15 wherein the ethylene-vinylacetate copolymer comprises about 3 to about 30 wt% vinylacetate.
Claim 20
Dependent Claim
62 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 21
Dependent Claim
25 words
The composition according to claim 19 wherein the polyolefin resin comprises about 10 to about 45 wt% of the composition based on resin plus rubber.
Claim 22
Dependent Claim
25 words
The composition according to claim 20 wherein the polyolefin resin comprises about 12 to about 35 wt% of the composition based on resin plus rubber.
Claim 23
Dependent Claim
25 words
The composition according to claim 19 wherein the second rubber comprises about 10 to about 80 wt% of the composition based on resin plus rubber.
Claim 24
Dependent Claim
26 words
The composition according to claim 19 wherein the second rubber comprises about 15 to about 70 wt% of the composition based on the resin plus rubber.
Claim 25
Dependent Claim
26 words
The composition according to claim 19 wherein the first rubber comprises about 6 to about 73 wt% of the composition based on the resin plus rubber.
Claim 26
Dependent Claim
26 words
The composition according to claim 19 wherein the first rubber comprises about 20 to about 55 wt% of the composition based on the resin plus rubber.
Claim 27
Dependent Claim
16 words
The composition according to claim 1 wherein a rubber process oil is incorporated into the composition.
Claim 28
Dependent Claim
33 words
The composition according to claim 26 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 29
Dependent Claim
134 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 selected from the group consisting of polyisobutylene, and ethylene propylene copolymer (EPM) and EPDM and at least one second rubber selected from the group consisting of halogenated butyl rubber and polychoroprene 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 30
Dependent Claim
134 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 selected from the group consisting of polyisobutylene, and ethylene propylene copolymer (EPM) and EPDM and at least one second rubber selected from the group consisting of halogenated butyl rubber and polychoroprene 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 31
Dependent Claim
24 words
The process according to claim 28 wherein the dynamic vulcanization is carried out at a temperature of about 120° C. to about 250° C.
Claim 32
Dependent Claim
24 words
The process according to claim 29 wherein the dynamic vulcanization is carried out at a temperature of about 180° C. to about 200° C.
Claim 33
Dependent Claim
20 words
The process according to claim 28 wherein the first rubber is polyisobutylene, and ethylene propylene copolymer (EPM) or an EPDM.
Claim 34
Dependent Claim
24 words
The process according to claim 28 wherein the second rubber is a halogenated butyl rubber or polychloroprene and the vulcanizing agent comprises zinc oxide.
Claim 35
Dependent Claim
19 words
The process according to claim 32 wherein the halogenated butyl rubber is chlorinated butyl rubber or brominated butyl rubber.
Claim 36
Dependent Claim
13 words
The process according to claim 32 wherein the vulcanizing agent includes an accelerator.
Claim 37
Dependent Claim
13 words
The process according to claim 29 wherein the accelerator is zinc alkyl dithiocarbamate.
Claim 38
Dependent Claim
17 words
The process according to claim 28 wherein the first rubber is polyisobulytene or an ethylene-propylene rubber (EPM).
Claim 39
Dependent Claim
163 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 selected from the group consisting of halogenated butyl rubber and polychoroprene 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 selected from the group consisting of polyisobutylene, and ethylene propylene copolymer (EPM) and EPDM at a temperature above the softening point of the polyolefin rubber.
Claim 40
Dependent Claim
163 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 selected from the group consisting of halogenated butyl rubber and polychoroprene 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 selected from the group consisting of polyisobutylene, and ethylene propylene copolymer (EPM) and EPDM at a temperature above the softening point of the polyolefin rubber.
Claim 41
Dependent Claim
17 words
The process according to claim 37 wherein the second rubber is not vulcanizable by the vulcanizing agent.
Claim 42
Dependent Claim
12 words
The process according to claim 38 wherein the vulcanizing agent is ZnO.
Claim 43
Dependent Claim
11 words
The process according to claim 39 wherein a accelerator is included.
Claim 44
Dependent Claim
135 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 selected from the group consisting of halogenated butyl rubber and polychoroprene with at least one second rubber selected from the group consisting of polyisobutylene and ethylene propylene copolymer (EPM) and EPDM 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 45
Dependent Claim
135 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 selected from the group consisting of halogenated butyl rubber and polychoroprene with at least one second rubber selected from the group consisting of polyisobutylene and ethylene propylene copolymer (EPM) and EPDM 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 46
Dependent Claim
14 words
The process according to claim 41 wherein the polyolefin resin comprises polypropylene or HDPE.
Claim 47
Dependent Claim
19 words
The process according to claim 42 wherein the polyolefin resin comprises a blend of polypropylene with an ethylene copolymer.
Claim 48
Dependent Claim
17 words
The process according to claim 43 wherein the ethylene copolymer is an EVA or an ethylene-methylacrylate copolymer.
Claim 49
Dependent Claim
14 words
The process according to claim 41 wherein the first rubber is chlorinated butyl rubber.
Claim 50
Dependent Claim
13 words
The process according to claim 41 wherein the second rubber is an EPDM.
Claim 51
Dependent Claim
15 words
The process according to claim 41 wherein the second rubber is polyisobutylene or an EPM.
Claim 52
Dependent Claim
19 words
The composition according to claim 11 wherein the polyolefin resin is a blend of polypropylene and an ethylene copolymer.
Claim 53
Dependent Claim
17 words
The composition according to claim 48 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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |