US3872068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing block copolymer resin
Assignee: Denka Co Ltd
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Filing: 1973-05-04
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Granted: 1975-03-18
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Expires: 1993-05-04
Abstract
Abstract An impact resistant block copolymer prepared by polymerizing a mixture of a vinyl substituted aromatic hydrocarbon and a conjugated diene in a non-polar solvent wherein said polymerization is initiated with an initiator prepared by reacting lithium with a non-condensed type polycyclic aromatic hydrocarbon, so as to form a block copolymer having a middle portion of an elastomeric tapered copolymer of a conjugated diene and a minor amount of a vinyl substituted aromatic hydrocarbon, which is chain terminated on both ends with blocks of a polymerized vinyl substituted aromatic hydrocarbon.
Inventors
- 👤 Shigeki Horiie
- 👤 Susumu Kurematsu
- 👤 Shin-Ichiro Asai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:55
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F297/00; C08F297/02; C08F297/04; C08F297/042
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
A PROCESS FOR PREPARING AN IMPACT RESISTANT BLOCK COPOLYMER WHICH COMPRISES: FORMING A COMPLEX OF LITHIUM METAL AND BIPHENYL OR TERPHENYL IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF TETRAHYDROFURAN, TETRAHYDROPYRAN, ETHYLENE GLYCOL DIETHYL ETHER, ETHYLENE GLYCOL DIMETHYL ETHER AND DIETHYLENE GLYCOL DIMETHYL ETHER AT A TEMPERATURE OF -78*C TO 30*C WHEREIN 1-10 GRAM ATOM OF LITHIUM PER MOLE OF SAID BIPHENYL OR TERPHENYL IS USED, REACTING BUTADIENE WITH SAID COMPLEX SO AS TO PREPARE A AROMATIC HYDROCARBON SOLUBLE BUTADIENE OLIGOMER DILITHIUM, REMOVING SAID SOLVENT FROM SAID COMPLEX AND CONTACTING AND POLYMERIZING A VINYL SUBSTITUTED AROMATIC HYDROCARBON AND A CONJUGATED DIENE IN THE PRESENCE OF SAID COMPLEX, WHEREIN SAID POLYMERIZATION REACTION IS EFFECTED IN AN AROMATIC HYDROCARBON SOLVENT SO AS TO FORM A BLOCK COPOLYMER HAVING A MIDDLE PORTION OF AN ELASTOMERIC TAPERED COPOLYMER OF A CONJUGATED DIENE AND A MINOR AMOUNT OF A VINYL SUBSTITUTED AROMATIC HYDROCARBON, WHICH IS CHAIN TERMINATED ON BOTH ENDS WITH BLOCKS OF A POLYMERIZED VINYL SUBSTITUTED AROMATIC HYDROCARBON.
Claim 2
Dependent Claim
165 words
A PROCESS FOR PREPARING AN IMPACT RESISTANT BLOCK COPOLYMER WHICH COMPRISES: FORMING A COMPLEX OF LITHIUM METAL AND BIPHENYL OR TERPHENYL IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF TETRAHYDROFURAN, TETRAHYDROPYRAN, ETHYLENE GLYCOL DIETHYL ETHER, ETHYLENE GLYCOL DIMETHYL ETHER AND DIETHYLENE GLYCOL DIMETHYL ETHER AT A TEMPERATURE OF -78*C TO 30*C WHEREIN 1-10 GRAM ATOM OF LITHIUM PER MOLE OF SAID BIPHENYL OR TERPHENYL IS USED, REACTING BUTADIENE WITH SAID COMPLEX SO AS TO PREPARE A AROMATIC HYDROCARBON SOLUBLE BUTADIENE OLIGOMER DILITHIUM, REMOVING SAID SOLVENT FROM SAID COMPLEX AND CONTACTING AND POLYMERIZING A VINYL SUBSTITUTED AROMATIC HYDROCARBON AND A CONJUGATED DIENE IN THE PRESENCE OF SAID COMPLEX, WHEREIN SAID POLYMERIZATION REACTION IS EFFECTED IN AN AROMATIC HYDROCARBON SOLVENT SO AS TO FORM A BLOCK COPOLYMER HAVING A MIDDLE PORTION OF AN ELASTOMERIC TAPERED COPOLYMER OF A CONJUGATED DIENE AND A MINOR AMOUNT OF A VINYL SUBSTITUTED AROMATIC HYDROCARBON, WHICH IS CHAIN TERMINATED ON BOTH ENDS WITH BLOCKS OF A POLYMERIZED VINYL SUBSTITUTED AROMATIC HYDROCARBON.
Claim 3
Dependent Claim
36 words
The process of claim 1, wherein at the completion of said reaction of lithium and aromatic hydrocarbon, the polar medium is replaced with a non-polar solvent to make a homogeneous initiator solution containing no polar medium.
Claim 4
Dependent Claim
13 words
The process of claim 1, wherein the vinyl substituted aromatic hydrocarbon is styrene.
Claim 5
Dependent Claim
11 words
The process of claim 1, wherein the conjugated diene is butadiene.
Claim 6
Dependent Claim
11 words
The process of claim 1, wherein the conjugated diene is isoprene.
Claim 7
Dependent Claim
22 words
The process of claim 1, wherein the rate of said vinyl substituted aromatic hydrocarbon to conjugated diene is 60:40 -95:5 by weight.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said solvent is tetrahydrofuran or tetrahydropyran.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |