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US5164477A Expired / Lapsed US ⏱️ 0.0 years remaining

Polyfunctional polymerization initiator

Assignee: Individual
•
Filing: 1991-08-02
•
Granted: 1992-11-17
•
Expires: 2011-08-02
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Abstract

Abstract A polyfunctional polymerization initiator suitable to cationic ring-opening polymerization of heterocyclic monomers, having at least one carbon atom bonded directly to a carbon-carbon double bond in a linear or cyclic organic group and, further, having at least two following groups containing the above said carbon atoms and represented by the general formula: --CH.sub.2 X where X represents an electron attracting group such as I, Br, Cl, F, --OSO 2 R, --SOR, --OCOR, --OPO(OR) 2 and --OP(OR)R and R is optionally selected from (substituted) alkyl groups or (substituted) aryl groups. Various types of telechelic polymer, block copolymer, comb-like polymer and star-like polymer having controlled molecular weight and narrow molecular weight distribution can be produced efficiently from the heterocyclic monomer as the starting material.

Inventors

  • 👤 Shiro Kobayashi
  • 👤 Hiroshi Uyama

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 06:57
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0233

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 72 words
A process for cationic ring-opening polymerization of 2-oxazolines, comprising contacting a 2-oxazoline with a polyfunctional polymerization initiator having at least one carbon atom bonded directly to a carbon-carbon double bond in a linear or cyclic organic group, said carbon-carbon double bond having at least two groups represented by the formula --CH 2 X, wherein X represents an electrophilic group, and polymerizing said 2-oxazoline at a temperature of from -20° to 150° C.
Claim 2
Dependent Claim 72 words
A process for cationic ring-opening polymerization of 2-oxazolines, comprising contacting a 2-oxazoline with a polyfunctional polymerization initiator having at least one carbon atom bonded directly to a carbon-carbon double bond in a linear or cyclic organic group, said carbon-carbon double bond having at least two groups represented by the formula --CH 2 X, wherein X represents an electrophilic group, and polymerizing said 2-oxazoline at a temperature of from -20° to 150° C.
Claim 3
Dependent Claim 32 words
The process of claim 1, wherein said linear or cyclic organic group is selected from at least one of the group consisting of linear olefinic groups, cyclic olefinic groups and aryl groups.
Claim 4
Dependent Claim 39 words
The process of claim 1, wherein said electrophilic group is selected from the group consisting of I, Br, Cl, --OSO 2 R, --SOR, --OCOR, --OPO(OR) 2 and --OP(OR)R, and wherein R is selected from alkyl groups and aryl groups.
Claim 5
Dependent Claim 27 words
The process of claim 1, wherein said polyfunctional polymerization initiator is selected from the group consisting of 1,4-dibromo-2-butene, 3-bromo-2-bromomethyl-1-propene, 1,4-dibromo-2-bromomethyl-2-butene, 1,4-dibromo-2,3-bis(bromomethyl)-2-butene, bis(bromomethyl)benzene, tris(bromomethyl)benzene, bis(bromomethyl)napthalene, tris(bromomethyl)napthalene and 2-tosylmethyl-3-tosyloxy-1-propene.
Claim 6
Dependent Claim 12 words
The process of claim 4, wherein said polyfunctional polymerization initiator is 1,4-dibromo-2-butene.
Claim 7
Dependent Claim 16 words
The process of claim 1, wherein an inorganic salt is added to said polyfunctional polymerization initiator.
Claim 8
Dependent Claim 12 words
The process of claim 6, wherein said inorganic salt comprises sodium iodide.
Claim 9
Dependent Claim 9 words
A polymer produced by the process of claim 1.
Claim 10
Dependent Claim 12 words
The polymer of claim 8, wherein said polyfunctional polymerization initiator is 1,4-dibromo-2-butene.

References Cited (Backward Citations)

US4204064A Cited
US4265836A Cited
US4306100A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-11-17 1996-05-18 1996-11-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-11-17 2000-05-18 2000-11-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-11-17 2004-05-18 2004-11-17 $7700.00 Window Closed / Lapsed

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