Patent US4014689A successfully refreshed from Google Patents.
US4128523A
Expired / Lapsed
US
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Polyethylene-EDPM compositions
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1977-08-18
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Granted: 1978-12-05
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Expires: 1997-08-18
Abstract
Abstract Blends of low molecular weight crystalline polyethylene and crystalline EPDM polymers exhibit good processing and on curing show unexpected high flexural modulus. The addition of reinforcing agents will raise the modulus and other physical properties but the processability can remain satisfactory.
Inventors
- 👤 James E. Britton
- 👤 Fredric D. Metcalf
- 👤 John G. Sommer
- 👤 Tiong H. Kuan
- 👤 Victor R. Rilling
- 👤 John A. Welch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:52
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/16; C08K; C08K3/00; C08K3/02; C08K3/06; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/346; C08K5/00; C08K5/04; C08K5/09; C08L23/04; C08L23/06; C08L91/00; C08L2205/00; C08L2205/02; C08L2205/025; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
94 words
A curable processable composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 100, a crystallinity at room temperature without stretching of from about 1.5 to 16%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average weight of from about 6,000 to 15,000, said crystalline polyethylene being used in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 2
Dependent Claim
94 words
A curable processable composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 100, a crystallinity at room temperature without stretching of from about 1.5 to 16%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average weight of from about 6,000 to 15,000, said crystalline polyethylene being used in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 3
Dependent Claim
31 words
A curable processable composition according to claim 1 in which the parts by weight ratio of said PE to said EPDM is from about 10 to 100 to 40 to 100.
Claim 4
Dependent Claim
104 words
A curable processable composition according to claim 1 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, a processing oil in an amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer, and a sulfur curing system in an amount sufficient to cure said composition.
Claim 5
Dependent Claim
33 words
A curable processable composition according to claim 1 in which the EPDM contains at least 75 mole % ethylene, the PE is a low density polyethylene, and the diene is a non-conjugated diene.
Claim 6
Dependent Claim
104 words
A curable processable composition according to claim 4 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, a processing oil in an amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer and a sulfur curing system in an amount sufficient to cure said composition.
Claim 7
Dependent Claim
124 words
A curable processable composition according to claim 4 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 125 to 215 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of said composition being said carbon black pigment, a processing oil in an amount of from about 5 to 35 parts by weight per 100 parts by weight of the EPDM polymer and a sulfur curing system in an amount sufficient to cure said composition, and wherein the parts by weight ratio of said PE to said EPDM is from about 10:100 to 40:100.
Claim 8
Dependent Claim
95 words
A curable processable composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 35, a crystallinity at room temperature without stretching of from about 4.5 to 13%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average molecular weight of from about 6,000 to 15,000, said crystalline polyethylene being used in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 9
Dependent Claim
95 words
A curable processable composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 35, a crystallinity at room temperature without stretching of from about 4.5 to 13%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average molecular weight of from about 6,000 to 15,000, said crystalline polyethylene being used in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 10
Dependent Claim
31 words
A curable processable composition according to claim 7 in which the parts by weight ratio of said PE to said EPDM is from about 10 to 100 to 40 to 100.
Claim 11
Dependent Claim
103 words
A curable processable composition according to claim 7 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, a processing oil in amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer, and a sulfur curing system in an amount sufficient to cure said composition.
Claim 12
Dependent Claim
33 words
A curable processable composition according to claim 7 in which the EPDM contains at least 75 mole % ethylene, the PE is a low density polyethylene, and the diene is a non-conjugated diene.
Claim 13
Dependent Claim
104 words
A curable processable composition according to claim 10 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, a processing oil in an amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer and a sulfur curing system in an amount sufficient to cure said composition.
Claim 14
Dependent Claim
124 words
A curable processable composition according to claim 10 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 125 to 215 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of said composition being said carbon black pigment, a processing oil in an amount of from about 5 to 35 parts by weight per 100 parts by weight of the EPDM polymer and a sulfur curing system in an amount sufficient to cure said composition, and wherein the parts by weight ratio of said PE to said EPDM is from about 10:100 to 40:100.
Claim 15
Dependent Claim
95 words
A sulfur cured composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 100, a crystallinity at room temperature without stretching of from about 1.5 to 16%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average molecular weight of from about 6,000 to 15,000, said crystalline polyethylene being present in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 16
Dependent Claim
95 words
A sulfur cured composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 100, a crystallinity at room temperature without stretching of from about 1.5 to 16%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average molecular weight of from about 6,000 to 15,000, said crystalline polyethylene being present in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 17
Dependent Claim
31 words
A sulfur cured composition according to claim 13 in which the parts by weight ratio of said PE to said EPDM is from about 10 to 100 to 40 to 100.
Claim 18
Dependent Claim
92 words
A sulfur cured composition according to claim 13 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, and a processing oil in an amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer.
Claim 19
Dependent Claim
33 words
A sulfur cured composition according to claim 13 in which the EPDM contains at least 75 mole % ethylene, the PE is a low density polyethylene, and the diene is a non-conjugated diene.
Claim 20
Dependent Claim
92 words
A sulfur cured composition according to claim 16 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, and a processing oil in an amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer.
Claim 21
Dependent Claim
112 words
A sulfur cured composition according to claim 16 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 125 to 215 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of said composition being said carbon black pigment, and a processing oil in an amount of from about 5 to 35 parts by weight per 100 parts by weight of the EPDM polymer, and wherein the parts by weight ratio of said PE to said EPDM is from about 10:100 to 40:100.
Claim 22
Dependent Claim
80 words
A sulfur cured composition according to claim 18 exhibiting a flexural modulus at room temperature of about at least 20,000 p.s.i., a heat sag at 250° F. of not over about 0.80 inch, a flexural set in degrees of not over 20, a tear strength in pounds per linear inch (Die C) of at least 200, a 100% modulus of from 800 to 2,000 p.s.i., a tensile strength of at least 1,500 p.s.i., and an elongation of at least 150%.
Claim 23
Dependent Claim
29 words
A sulfur cured composition according to claim 13 in which up to about 40 parts by weight of said crystalline EPDM has been replaced by an essentially non-crystalline EPDM.
Claim 24
Dependent Claim
95 words
A sulfur cured composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 35 a crystallinity at room temperature without stretching of from about 4.5 to 13%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average molecular weight of from about 6,000 to 15,000, said crystalline polyethylene being present in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 25
Dependent Claim
95 words
A sulfur cured composition comprising a blend of an ethylene-propylene-diene rubbery polymer (EPDM) having a raw Mooney viscosity ML (1+4) at 250° F. of from about 25 to 35 a crystallinity at room temperature without stretching of from about 4.5 to 13%, and an ethylene content of at least about 65 mole %, and crystalline solid polyethylene (PE) having an average molecular weight of from about 6,000 to 15,000, said crystalline polyethylene being present in an amount of from about 5 to 110 parts by weight per 100 parts by weight of said ethylene-propylene-diene polymer.
Claim 26
Dependent Claim
30 words
A sulfur cured composition according to claim 21 in which the parts by weight ratio of said PE to said EPDM is from about 10 to 100 40 to 100.
Claim 27
Dependent Claim
92 words
A sulfur cured composition according to claim 21 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, and a processing oil in an amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer.
Claim 28
Dependent Claim
33 words
A sulfur cured composition according to claim 21 in which the EPDM contains at least 75 mole % ethylene, the PE is a low density polyethylene, and the diene is a non-conjugated diene.
Claim 29
Dependent Claim
92 words
A sulfur cured composition according to claim 24 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 75 to 250 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of the composition being said carbon black pigment, and a processing oil in an amount of not over about 75 parts by weight per 100 parts by weight of the EPDM polymer.
Claim 30
Dependent Claim
112 words
A sulfur cured composition according to claim 24 containing additionally finely divided rubber reinforcing pigments selected from the group consisting of carbon black pigments and non-carbon black pigments and mixtures of the same in an amount of from about 125 to 215 parts by weight per 100 parts by weight of the EPDM polymer, not over about 30% by weight of said composition being said carbon black pigment, and a processing oil in an amount of from about 5 to 35 parts by weight per 100 parts by weight of the EPDM polymer, and wherein the parts by weight ratio of said PE to said EPDM is from about 10:100 to 40:100.
Claim 31
Dependent Claim
80 words
A sulfur cured composition according to claim 26 exhibiting a flexural modulus at room temperature of about at least 20,000 p.s.i., a heat sag at 250° F. of not over about 0.80 inch, a flexural set in degrees of not over 20, a tear strength in pounds per linear inch (Die C) of at least 200, a 100% modulus of from 800 to 2,000 p.s.i., a tensile strength of at least 1,500 p.s.i., and an elongation of at least 150%.
Claim 32
Dependent Claim
29 words
A sulfur cured composition according to claim 21 in which up to about 40 parts by weight of said crystalline EPDM has been replaced by an essentially non-crystalline EPDM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |