Patent US4352916A successfully refreshed from Google Patents.
US4352916A
Expired / Lapsed
US
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Use of hydrophobically modified water soluble polymers in suspension polymerization
Assignee: Aqualon Co
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Filing: 1981-07-17
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Granted: 1982-10-05
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Expires: 2001-07-17
Abstract
Abstract Use of hydrophobically modified nonionic cellulose ethers or ethylene oxide copolymers leads to improved particle size and less latex formation in suspension polymerization processes. Cellulose ethers are modified with a small amount of long chain (C 6 -C 25 ) alkyl radical. Ethylene oxide copolymer is ethylene oxide copolymerized with C 6 to C 24 epoxide.
Inventors
- 👤 Leo M. Landoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:14
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/18; C08F2/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
In a process wherein at least one vinyl monomer is polymerized by dissolving a polymerization initiator in said vinyl monomer, suspending the resultant solution in water containing a suspension stabilizer and subjecting the suspension to polymerization conditions, the improvement which comprises the suspension stabilizer being selected from the class consisting of (a) a water-soluble, nonionic cellulose ether modified with a C 6 to C 25 alkyl radical in an amount between about 0.2% by weight and an amount sufficient to render said ether less than 1% soluble in water; and (b) a copolymer of ethylene oxide and about 0.2 to 4% by weight of a C 6 to C 24 alkyl epoxide.
Claim 2
Dependent Claim
112 words
In a process wherein at least one vinyl monomer is polymerized by dissolving a polymerization initiator in said vinyl monomer, suspending the resultant solution in water containing a suspension stabilizer and subjecting the suspension to polymerization conditions, the improvement which comprises the suspension stabilizer being selected from the class consisting of (a) a water-soluble, nonionic cellulose ether modified with a C 6 to C 25 alkyl radical in an amount between about 0.2% by weight and an amount sufficient to render said ether less than 1% soluble in water; and (b) a copolymer of ethylene oxide and about 0.2 to 4% by weight of a C 6 to C 24 alkyl epoxide.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the vinyl monomer is selected from styrene, methyl methacrylate, vinyl chloride, diethylamino ethyl methacrylate and butyl methacrylate.
Claim 4
Dependent Claim
37 words
The process of claim 2 wherein the stabilizer is modified hydroxyethyl cellulose having hydroxyethyl M.S. between about 1.5 and 3.5 and substituted with about 0.2 to 4% by weight of C 6 to C 25 alkyl radical.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein the stabilizer is ethylene oxide copolymer.
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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |