US4393199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cationic polymerization
Assignee: SRI International Inc
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Filing: 1981-05-12
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Granted: 1983-07-12
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Expires: 2001-05-12
Abstract
Abstract Method of carrying out cationic polymerization with molecular weight control in which a preinitiator precursor, e.g. a diol and a catalyst effective for cationic polymerization (or a preformed adduct of such precursor and catalyst) are mixed with a monomer (e.g. a cyclic ether) in proportions of one mol of precursor or adduct and n mols of monomer, where n is the relatively small number of mer units desired in the polymer, causing polymerization to proceed to completion, then treating the resulting living cationic polymer as desired, e.g. quenching with water to introduce a terminal hydroxyl group, adding another monomer to produce a block polymer, reacting with an anionic polymer, etc. Also polymers so formed. Such polymers have low polydispersity and conversion and yield of the desired polymer are high.
Inventors
- 👤 Gerald E. Manser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:19
CPC Classifications
C; C07; C07D; C07D305/00; C07D305/02; C07D305/04; C07D305/06; C07D307/00; C07D307/02; C07D307/04; C07D307/10; C07D307/14; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/16; C08G65/22; C08G65/26; C08G65/2642; C08G65/2645; C08G65/2669
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
177 words
A method of polymerizing a monomer which is capable of cationic polymerization which comprises: (a) providing a monomer capable of cationic polymerization (b) providing a preinitiator precursor and a catalyst, the catalyst being effective to cause cationic polymerization of monomers, the preinitiator precursor being such that it will form an adduct with the catalyst which in turn will form an initiating species with the monomer which will undergo chain extension with a further quantity of the monomer, (c) forming a mixture of the catalyst and preinitator precursor or separately forming an adduct of the catalyst and preinitiator precursor, (d) bringing such mixture or preformed adduct into contact with a quantity of the monomer in the proportion of one mol of adduct to n mols of monomer, n being a relatively small number, the quantity of adduct considerably exceeding the quantity required for catalysis, and (e) causing polymerization to proceed to substantial completion, thereby producing a polymer of low polydispersity consisting predominantly of n mer units derived from the monomer and one unit derived from the preinitiator precursor.
Claim 2
Independent Claim
177 words
A method of polymerizing a monomer which is capable of cationic polymerization which comprises: (a) providing a monomer capable of cationic polymerization (b) providing a preinitiator precursor and a catalyst, the catalyst being effective to cause cationic polymerization of monomers, the preinitiator precursor being such that it will form an adduct with the catalyst which in turn will form an initiating species with the monomer which will undergo chain extension with a further quantity of the monomer, (c) forming a mixture of the catalyst and preinitator precursor or separately forming an adduct of the catalyst and preinitiator precursor, (d) bringing such mixture or preformed adduct into contact with a quantity of the monomer in the proportion of one mol of adduct to n mols of monomer, n being a relatively small number, the quantity of adduct considerably exceeding the quantity required for catalysis, and (e) causing polymerization to proceed to substantial completion, thereby producing a polymer of low polydispersity consisting predominantly of n mer units derived from the monomer and one unit derived from the preinitiator precursor.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the monomer is a cyclic ether containing 2 to 5 carbon atoms in the ether ring.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the cyclic ether is an epoxide.
Claim 5
Dependent Claim
12 words
The method of claim 2 wherein the cyclic ether is an oxetane.
Claim 6
Dependent Claim
12 words
The method of claim 2 wherein the cyclic ether is a tetrahydrofuran.
Claim 7
Dependent Claim
12 words
The method of claim 2 wherein the preinitiator precursor is a polyol.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein the preinitiator precursor is a diol.
Claim 9
Dependent Claim
33 words
The method of claim 6 wherein the cyclic ether or the polyol or both are substituted by one or more groups that contribute substantially to energy upon decomposition or combustion of the polymer.
References Cited (Backward Citations)
US2792375A
Cited
GB859643A
Cited
GB882630A
Cited
GB917951A
Cited
GB1023656A
Cited
US3558722A
Cited
GB1125935A
Cited
US3417034A
Cited
GB1147791A
Cited
GB1193924A
Cited
GB1231822A
Cited
GB1192349A
Cited
GB1232622A
Cited
GB1233299A
Cited
GB1278879A
Cited
GB1380678A
Cited
US3850856A
Cited
GB1512528A
Cited
GB1575529A
Cited
US4153786A
Cited
GB2021606B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |