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US4587290A
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US
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Polymerization process using nonionic surfactant and copolymerizable unsaturated polyethylene glycol
Assignee: Imperial Chemical Industries Ltd
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Filing: 1983-09-19
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Granted: 1986-05-06
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Expires: 2003-09-19
Abstract
Abstract Wholly non-charged, sterically stabilized aqueous polymer dispersions are made by emulsifying ethylenically unsaturated monomer(s) of specified slight solubility in water and subjecting them in that state to polymerization in the presence of hydrogen peroxide and a non-ionic water-soluble activator compound and also in the presence of a steric stabilizer precursor compound containing a polymer chain which is soluble in the aqueous phase and an unsaturated grouping which can copolymerize with the monomer(s). The emulsification may be assisted by a conventional non-ionic surfactant, or alternatively the precursor compound may itself possess surface-active properties.
Inventors
- 👤 Stephen P. Davies
- 👤 Morice W. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:28
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
140 words
A polymerisation process in which at least one ethylenically unsaturated monomer, having a solubility in water in the range 0.08%-8% by weight but giving rise to a polymer which is insoluble in water, is emulsified in water and is subjected in that state to polymerisation in the presence of (a) a redox-type polymerisation initiator system comprising hydrogen peroxide in combination with a non-ionic water-soluble activator compound, (b) 0.5% to 10%, by weight of the monomer to be polymerized, of a conventional non-ionic surfactant and (c) 0.5 to 20%, by weight of the monomer to be polymerized, of a precursor compound the molecule of which consists of (i) a polyethylene glycol chain which has a molecular weight of 500 to 4,000 and (ii) attached to said chain at least one unsaturated grouping selected from the group consisting of methacrylate and allyl.
Claim 2
Dependent Claim
140 words
A polymerisation process in which at least one ethylenically unsaturated monomer, having a solubility in water in the range 0.08%-8% by weight but giving rise to a polymer which is insoluble in water, is emulsified in water and is subjected in that state to polymerisation in the presence of (a) a redox-type polymerisation initiator system comprising hydrogen peroxide in combination with a non-ionic water-soluble activator compound, (b) 0.5% to 10%, by weight of the monomer to be polymerized, of a conventional non-ionic surfactant and (c) 0.5 to 20%, by weight of the monomer to be polymerized, of a precursor compound the molecule of which consists of (i) a polyethylene glycol chain which has a molecular weight of 500 to 4,000 and (ii) attached to said chain at least one unsaturated grouping selected from the group consisting of methacrylate and allyl.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1, wherein the monomer being polymerised is such that the resulting polymer has a glass transition temperature of not more than 60° C.
Claim 4
Dependent Claim
16 words
A process as claimed in claim 1, wherein the non-ionic water-soluble activator compound is ascorbic acid.
Claim 5
Dependent Claim
45 words
A process as claimed in claim 1, wherein the hydrogen peroxide is employed in an amount of from 0.003% to 6.0% by weight, and the activator compound in an amount of from 0.01% to 7.5% by weight, based on the amount of monomer being polymerised.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 1, wherein the polyethylene glycol chain (i) has a molecular weight of at least 1000.
Claim 7
Dependent Claim
36 words
A process as claimed in claim 5, wherein the polyethylene glycol chain (i) is derived from a polyethylene glycol, or a monoalkyl ether thereof, in which the alkyl group contains from 1 to 4 carbon atoms.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 6 wherein the polyethylene glycol chain (i) is derived from a polyethylene glycol, or a monomethyl ether thereof, of molecular weight in the range 2000-4000.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 7, wherein the precursor compound is the methacrylic acid ester of the monomethyl ether of polyethylene glycol, mol.wt. 2000.
Claim 10
Dependent Claim
30 words
A process as claimed in claim 1, wherein there is present, in an amount of from 0.1% to 2% by weight of the monomer taken, a water-soluble chain transfer agent.
Claim 11
Dependent Claim
25 words
A process as claimed in claim 1, wherein the monomers to be polymerised include a reactive monomer selected from glycidyl acrylate, glycidyl methacrylate and γ-methacryloxypropyltrimethoxysilane.
Claim 12
Dependent Claim
16 words
A sterically stabilised aqueous dispersion of polymer obtained by a process as claimed in claim 1.
Claim 13
Dependent Claim
16 words
A sterically stabilised aqueous dispersion of polymer obtained by a process as claimed in claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |