US4104455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of monomer
Assignee: Tosoh Corp
•
Filing: 1977-03-30
•
Granted: 1978-08-01
•
Expires: 1997-03-30
Abstract
Abstract In the polymerization of an anionically polymerizable monomer using a polymerization system comprising a monomer and a polymerization solvent wherein an organometallic compound polymerization initiator, soluble in said polymerization system and having the formula:
Inventors
- 👤 Mitsuru Nagasawa
- 👤 Teruo Fujimoto
- 👤 Kazuo Tago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:18
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
In the polymerization of an anionically polymerizable monomer using a polymerization system comprising a monomer and a polymerization solvent wherein an organometallic compound polymerization initiator, soluble in said polymerization system having the formula: MeR.sub.x wherein Me is a metal selected from the group consisting of Groups I and II of the Periodic Test; R represents an alkyl or aryl group, or an aliphatic or aromatic hydrocarbon residue; and the integer x is 1 or 2; is added to said system, the improvement which comprises adding said polymerization initiator to said polymerization system as a solution comprising said polymerization initiator dissolved in a high viscosity solvent having a viscosity greater than 1 cp at room temperature and which is at least one member selected from the group consisting of n-hexylbenzene, n-butylbenzene, decalin, 1,2,3,4-tetrahydronaphthalene, liquid paraffin, and a mixture of liquid paraffin and benzene, wherein polymerization is subsequently initiated as the initiator dissolves in said polymerization system.
Claim 2
Dependent Claim
155 words
In the polymerization of an anionically polymerizable monomer using a polymerization system comprising a monomer and a polymerization solvent wherein an organometallic compound polymerization initiator, soluble in said polymerization system having the formula: MeR.sub.x wherein Me is a metal selected from the group consisting of Groups I and II of the Periodic Test; R represents an alkyl or aryl group, or an aliphatic or aromatic hydrocarbon residue; and the integer x is 1 or 2; is added to said system, the improvement which comprises adding said polymerization initiator to said polymerization system as a solution comprising said polymerization initiator dissolved in a high viscosity solvent having a viscosity greater than 1 cp at room temperature and which is at least one member selected from the group consisting of n-hexylbenzene, n-butylbenzene, decalin, 1,2,3,4-tetrahydronaphthalene, liquid paraffin, and a mixture of liquid paraffin and benzene, wherein polymerization is subsequently initiated as the initiator dissolves in said polymerization system.
Claim 3
Dependent Claim
16 words
The polymerization of claim 1, wherein said high viscosity solvent does not inhibit the anionic polymerization.
Claim 4
Dependent Claim
27 words
The polymerization of claim 1, wherein the high viscosity solvent is at least one member selected from the group consisting of hexylbenzene, decalin, 1,2,3,4-tetrahydronaphthalene, and liquid paraffin.
Claim 5
Dependent Claim
36 words
The polymerization of claim 1, wherein the monomer and the solvent for polymerization are purified by dehydrating with a dehydrating agent in vacuum or in an inert gas and then distilling the monomer or the solvent.
Claim 6
Dependent Claim
37 words
The polymerization of claim 1, wherein the solution of the organometallic compound is added dropwise to the polymerization system so as to first react with impurities contained in the polymerization system until initiation of the polymerization ensues.
Claim 7
Dependent Claim
40 words
The polymerization of claim 1, wherein the concentration of the organometallic compound is in the range of 10 1 -10 -7 mole/l and wherein the amount of the monomer in the polymerization system is in the range of 0.5-20 wt.%.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |