US4412896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparation of graft copolymer of styrene and an EPDM rubber
Assignee: Orkem SA
•
Filing: 1981-07-08
•
Granted: 1983-11-01
•
Expires: 2001-07-08
Abstract
Abstract A process of preparation of a graft copolymer of (a) styrene and (b) an EPDM rubber by mass polymerization followed by irradiation, for example electron irradiation.
Inventors
- 👤 Maurice Lemattre
- 👤 Robert Roussel
- 👤 Rene Wirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:12
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
42 words
A process for preparing a crosslinked graft copolymer of styrene and an EPDM rubber, consisting essentially of mass polymerizing a solution of the EPDM rubber in styrene and recovering the resultant graft copolymer and thereafter crosslinking the resultant copolymer by irradiation treatment.
Claim 2
Dependent Claim
42 words
A process for preparing a crosslinked graft copolymer of styrene and an EPDM rubber, consisting essentially of mass polymerizing a solution of the EPDM rubber in styrene and recovering the resultant graft copolymer and thereafter crosslinking the resultant copolymer by irradiation treatment.
Claim 3
Dependent Claim
27 words
A process according to claim 1, wherein the solution of the EPDM rubber in styrene further comprises up to 12% by weight of ethylbenzene relative to styrene.
Claim 4
Dependent Claim
19 words
A process according to claim 1, wherein said irradiation treatment is effected with gamma rays, x-rays or electron radiation.
Claim 5
Dependent Claim
14 words
A process according to claim 3, wherein the irradiation is effected with electron irradiation.
Claim 6
Dependent Claim
16 words
A process according to claim 4, wherein the irradiation does is about 5 to 20 megarads.
Claim 7
Dependent Claim
17 words
A process according to claim 1, wherein the mass polymerization is continued until polymerization is substantially complete.
Claim 8
Dependent Claim
30 words
A process according to claim 1, wherein the polymerization step is effected with a solution having a weight ratio of styrene to the EDPM rubber of from 6:1 to 20:1.
Claim 9
Dependent Claim
14 words
A process according to claim 7, wherein said ratio is from 7:1 to 13:1.
Claim 10
Dependent Claim
32 words
A process according to claim 1, wherein after polymerization, the resultant polymer is heat treated, freed from volatile matter and granulated, and the granulated polymer is then subjected to the irradiation treatment.
Claim 11
Dependent Claim
17 words
A process according to claim 1, wherein the crosslinked graft copolymer has a gel content of 15-30%.
Claim 12
Dependent Claim
12 words
A process according to claim 10, wherein said gel content is 7-25.
Claim 13
Dependent Claim
17 words
A process according to claim 1, wherein the crosslinked graft copolymer has a swelling index of 6-14.
Claim 14
Dependent Claim
12 words
A process according to claim 12, wherein said swelling index is 8-12.
Claim 15
Dependent Claim
29 words
A process according to claim 1, wherein the microstructure of the crosslinked graft copolymer is such that substantially 100% of the particles have a size less than 2 microns.
Claim 16
Dependent Claim
20 words
A process according to claim 14, wherein at least 50% of the particles have a size less than 1.5 microns.
Claim 17
Dependent Claim
70 words
A process according to claim 6, wherein the polymerization is effected with a solution having a weight ratio of styrene to the EDPM rubber of from 6:1 to 20:1; wherein the crosslinked graft polymer has a gel content of 15-30%, and a swelling index of 6-14; and wherein the microstructure of the crosslinked graft copolymer is such that substantially 100% of the particles have a size less than 2 microns.
Claim 18
Dependent Claim
35 words
A process according to claim 16, which further comprises slubbing the crosslinked graft copolymer, the resultant slubbed copolymer having only minimally different impact resistance, gel content and swelling index from the copolymer prior to slubbing.
Claim 19
Dependent Claim
11 words
A crosslinked graft copolymer prepared by the process of claim 17.
Claim 20
Dependent Claim
35 words
A process according to claim 1, which further comprises slubbing the crosslinked graft copolymer, the resultant slubbed copolymer having only minimally different impact resistance, gel content and swelling index from the copolymer prior to slubbing.
Claim 21
Dependent Claim
11 words
A crosslinked graft copolymer prepared by the process of claim 16.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |