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US4855373A
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Multi-sited hydrazone initiators of vinyl polymerization
Assignee: Dow Chemical Co
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Filing: 1988-11-07
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Granted: 1989-08-08
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Expires: 2008-11-07
Abstract
Abstract The invention comprises an improved process for polymerization of vinyl monomers using novel multi-sited hydrazone initiators. The hydrazones are especially useful for initiation of polymerization processes for preparation of branched and cross-linked vinyl.
Inventors
- 👤 Richard A. Wolf
- 👤 John M. Warakomski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:41
CPC Classifications
C; C08; C08F; C08F4/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
A compound for initiation of vinyl polymerization comprising a hydrazone of Formula I: ##STR4## wherein: R 1 ═H or an alkyl group having up to 22 carbons; R 2 , R 3 and R 4 are independently H or an aromatic or an aliphatic group having up to 22 carbons.
Claim 2
Dependent Claim
50 words
A compound for initiation of vinyl polymerization comprising a hydrazone of Formula I: ##STR4## wherein: R 1 ═H or an alkyl group having up to 22 carbons; R 2 , R 3 and R 4 are independently H or an aromatic or an aliphatic group having up to 22 carbons.
Claim 3
Dependent Claim
69 words
The compound of claim 1 comprising the hydrazone of Formula I wherein: R 1 equals H or an alkyl group having up to 22 carbons; and R 2 , R 3 and R 4 are independently H or a substituted aromatic or a substituted aliphatic group having up to 22 carbons, each having at least one substituent selected from the group consisting of cyano, amino, hydroxy, phenoxy and nitro.
Claim 4
Dependent Claim
38 words
The compound of claim 1 comprising the hydrazone of Formula I wherein: R 1 equals H or an alkyl group having up to 22 carbons; and R 2 , R 3 and R 4 are independently tertiary alkyl.
Claim 5
Dependent Claim
12 words
The compound of claim 1 wherein the hydrazone comprises benzene 1,3,5-tris(acetyl t-butylhydrazone).
Claim 6
Dependent Claim
101 words
A process for polymerization of vinyl monomers comprising contacting a monomer of Formula II with a hydrazone of Formula I: wherein: R 1 ═H or an alkyl group having up to 22 carbons; R 2 , R 3 and R 4 are independently H, or an aromatic or an aliphatic group having up to 22 carbons; and R 5 , R 6 , R 7 and R 8 are selected from the group consisting of H, --COOR 1 , --CO(R 1 ) 2 , cyano, nitro, acetoxy, halo, alkylthio and an aromatic or an aliphatic group having up to 22 carbons.
Claim 7
Dependent Claim
101 words
A process for polymerization of vinyl monomers comprising contacting a monomer of Formula II with a hydrazone of Formula I: wherein: R 1 ═H or an alkyl group having up to 22 carbons; R 2 , R 3 and R 4 are independently H, or an aromatic or an aliphatic group having up to 22 carbons; and R 5 , R 6 , R 7 and R 8 are selected from the group consisting of H, --COOR 1 , --CO(R 1 ) 2 , cyano, nitro, acetoxy, halo, alkylthio and an aromatic or an aliphatic group having up to 22 carbons.
Claim 8
Dependent Claim
71 words
The process of of claim 5 wherein the hydrazone comprises a compound of formula I wherein: R 1 ═H or an alkyl group having up to 22 carbons; R 2 , R 3 and R 4 are independently H or a substituted aromatic or a substituted aliphatic group having up to 22 carbons, each having at least one substituent selected from the group consisting of cyano, amino, hydroxy, phenoxy and nitro.
Claim 9
Dependent Claim
46 words
The process of claim 5 wherein the vinyl monomer comprises a compound of Formula II wherein: R 5 selected from the group consisting of --COOR 1 ,--CON(R 1 ) 2 , cyano and phenyl; and R 6 , R 7 and R 8 are all hydrogens.
Claim 10
Dependent Claim
27 words
The process of claim 5 wherein the vinyl monomer is selected from the group consisting of acrylic acid, C 1-4 alkyl esters of acrylic acid and acrylamide.
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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |