EP0137603A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Preparation of coating compositions useful in an electrodeposition process
Assignee: Dulux Australia Ltd
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Filing: 1984-07-24
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Granted: —
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Expires: 2004-07-24
Abstract
Abstract Aqueous dispersions of film-forming polymer particles are prepared by first forming a cationically or anionically stabilised dispersion in water of a solution of preformed polymer or polymer plasticiser in initial polymerisable monomer; then polymerising the monomer and forming disperse polymer particles; and thereafter adding further polymerisable monomer which is then polymerised. The Tg of polymer prepared from the further monomer is higher than that of polymer prepared from the initial monomer. The polymer dispersions are useful in providing thick electrodeposited coatings.
Inventors
- 👤 Richard Paul Redman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 05:43
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4407; C08; C08F; C08F285/00; C08F291/00; C09D4/00; C09D4/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A process of preparing an aqueous dispersion of film-forming polymer particles which comprises the steps: (a) forming a stable cationically or anionically stabilised dispersion in aqueous medium of a preformed polymer or polymer plasticiser which is dissolved in polymerisable ethylenically unsaturated monomer, (b) causing polymerisation of the ethylenically unsaturated monomer and forming disperse particles of film-forming polymer, the particles comprising a blend of preformed polymer or polymer plasticiser and of polymer formed in situ from unsaturated monomer, (c) thereafter adding to the dispersion of polymer particles formed in (b) further polymerisable ethylenically unsaturated monomer, which if polymerised alone would yield polymer of Tg higher than that of the polymer formed in situ in (b), and (d) causing polymerisation of this further monomer to produce a dispersion of film-forming polymer particles which are a modification of the particles produced in (b).
Claim 2
Dependent Claim
140 words
A process of preparing an aqueous dispersion of film-forming polymer particles which comprises the steps: (a) forming a stable cationically or anionically stabilised dispersion in aqueous medium of a preformed polymer or polymer plasticiser which is dissolved in polymerisable ethylenically unsaturated monomer, (b) causing polymerisation of the ethylenically unsaturated monomer and forming disperse particles of film-forming polymer, the particles comprising a blend of preformed polymer or polymer plasticiser and of polymer formed in situ from unsaturated monomer, (c) thereafter adding to the dispersion of polymer particles formed in (b) further polymerisable ethylenically unsaturated monomer, which if polymerised alone would yield polymer of Tg higher than that of the polymer formed in situ in (b), and (d) causing polymerisation of this further monomer to produce a dispersion of film-forming polymer particles which are a modification of the particles produced in (b).
Claim 3
Dependent Claim
42 words
A process according to claim 1 wherein the stability of the dispersion in (a) is due, at least in part,to cationic or anionic stabilising groups present in the preformed polymer or polymer plasticiser or in a monomer to be polymerised in situ.
Claim 4
Dependent Claim
32 words
A process according to claim 1 or claim 2 wherein the stability of the dispersion in (a) is due, at least in part,to the presence of a distinct cationic or anionic surfactant.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein a cross- linking agent is also dissolved in the polymerisable ethylenically unsaturated monomer.
Claim 6
Dependent Claim
28 words
A process according to claim 4 wherein the cross- linking agent is reactive with hydroxyl groups present in a preformed polymer and in the polymer formed in situ.
Claim 7
Dependent Claim
19 words
A dispersion of film-forming polymer particles prepared by a process according to any one of claims 1 to 5.
Claim 8
Dependent Claim
37 words
A method of coating a conductive substrate as one electrode by passing an electric current between that electrode and a counter-electrode, the substrate being immersed in an aqueous dispersion of film-forming polymer particles according to claim 6.
References Cited (Backward Citations)
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