US4409355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high solids copolymer latices with low viscosity
Assignee: Millennium Petrochemicals Inc
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Filing: 1982-01-29
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Granted: 1983-10-11
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Expires: 2002-01-29
Abstract
Abstract A process is disclosed for preparing copolymer latices possessing a solids content of at least about 60 weight percent and a viscosity not exceeding 15,000 cp. Brookfield Viscosity (RVF, Spindle No. 4) at 2 rpm from (a) vinyl acetate in an amount representing from about 10 weight percent to about 95 weight percent of total monomer charge, and (b) at least one monomer selected from the group consisting of acrylate ester, methacrylate ester and vinyl ester of an alpha-branched saturated monocarboxylic acid representing the balance of the total monomer charge. The aforesaid latices are prepared by polymerizing in a single reaction stage at least 10 weight percent of the total vinyl acetate monomer (a) and from 0 to about 50 weight percent of the total acrylate ester, methacrylate ester and/or vinyl ester of alpha-branched saturated monocarboxylic acid monomer (b) in an aqueous emulsion reaction medium containing a polymerization catalyst, and thereafter polymerizing in said reactor in a second stage the remaining portion of the total vinyl acetate monomer (a) together with the remaining portion of the acrylate ester, methacrylate ester, and/or vinyl ester of alpha-branched saturated carboxylic acid monomer (b) in the reaction medium containing additional catalyst if needed, polymerization being continued substantially to completion.
Inventors
- 👤 Manfred Heimberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:27
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F263/00; C08F263/02; C08F263/04; C08F265/00; C08F265/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
199 words
A process for preparing copolymer latices possessing a solids content of at least about 60 weight percent and a viscosity not exceeding 15,000 cp. Brookfield Viscosity (RVF, Spindle No. 4) at 2 rpm from (a) vinyl acetate in an amount representing from about 10 weight percent to about 95 weight percent of total monomer charge, and (b) at least one monomer selected from the group consisting of acrylate ester, methacrylate ester, and vinyl ester of an alpha-branched saturated monocarboxylic acid representing the balance of the total monomer charge which comprises polymerizing in a single reaction stage at least 10 weight percent of the total vinyl acetate monomer (a) and from 0 to about 50 weight percent of the total acrylate ester, methyacrylate ester and/or vinyl ester of alpha-branched saturated monocarboxylic acid monomer (b) in an aqueous emulsion reaction medium containing a polymerization catalyst, and thereafter polymerizing in said reactor in a second stage the remaining portion of the total vinyl acetate monomer (a) together with the remaining portion of the acrylate ester, methacrylate ester, and/or vinyl ester of alpha-branched saturated carboxylic acid monomer (b) in the reaction medium containing additional catalyst if needed, polymerization being continued substantially to completion.
Claim 2
Dependent Claim
199 words
A process for preparing copolymer latices possessing a solids content of at least about 60 weight percent and a viscosity not exceeding 15,000 cp. Brookfield Viscosity (RVF, Spindle No. 4) at 2 rpm from (a) vinyl acetate in an amount representing from about 10 weight percent to about 95 weight percent of total monomer charge, and (b) at least one monomer selected from the group consisting of acrylate ester, methacrylate ester, and vinyl ester of an alpha-branched saturated monocarboxylic acid representing the balance of the total monomer charge which comprises polymerizing in a single reaction stage at least 10 weight percent of the total vinyl acetate monomer (a) and from 0 to about 50 weight percent of the total acrylate ester, methyacrylate ester and/or vinyl ester of alpha-branched saturated monocarboxylic acid monomer (b) in an aqueous emulsion reaction medium containing a polymerization catalyst, and thereafter polymerizing in said reactor in a second stage the remaining portion of the total vinyl acetate monomer (a) together with the remaining portion of the acrylate ester, methacrylate ester, and/or vinyl ester of alpha-branched saturated carboxylic acid monomer (b) in the reaction medium containing additional catalyst if needed, polymerization being continued substantially to completion.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein at least 10 weight percent of the total vinyl acetate is polymerized in the first stage.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein at least 25 weight percent of the total vinyl acetate is polymerized in the first stage.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the acrylate ester monomer is butyl acrylate and/or 2-ethylhexylacrylate
Claim 6
Dependent Claim
46 words
The process of claim 1 wherein the vinyl ester of alpha-branched monocarboxylic acid posesses the structural formula ##STR3## wherein R 1 and R 2 each represents the same or different alkyl radicals of normal, branched or cyclic structure and R 3 represents hydrogen or alkyl radical.
Claim 7
Dependent Claim
27 words
The process of claim 5 wherein the sum of the carbon atoms present in R 1 , R 2 and R 3 does not exceed about 30.
Claim 8
Dependent Claim
30 words
The process of claim 5 wherein a mixture of such vinyl esters are employed in which R 1 , R 2 and R 3 each is a saturated alkyl group.
Claim 9
Dependent Claim
44 words
The process of claim 1 in which one or more other ethylenically unsaturated monomers copolymerizable with monomers (a) and (b) present in an amount of up to 5 weight percent of the total monomer charge is added at the commencement of, or during, polymerization.
Claim 10
Dependent Claim
33 words
The process of claim 1 in which the vinyl acetate monomer (a) is present in an amount representing from about 30 weight percent to about 85 weight percent of the total monomer charge.
Claim 11
Dependent Claim
41 words
The process of claim 1 in which less than about 60 weight percent of the total vinyl acetate monomer present is initially added to the reaction medium with the balance thereof being sequentially added to the reaction medium with monomer (b).
Claim 12
Dependent Claim
27 words
The process of claim 1 in which the surface active agent is at least one member of the group consisting of nonionic and anionic surface active agents.
Claim 13
Dependent Claim
15 words
The process of claim 1 in which the reaction medium additionally contains a protective colloid.
Claim 14
Dependent Claim
16 words
The process of claim 1 in which the reaction medium additionally contains an alkaline buffering agent.
Claim 15
Dependent Claim
93 words
The process of claim 1 in which the balance of the total vinyl acetate monomer (a) together with the balance of the monomer (b) is added incrementally in the second step, wherein the ratio of vinyl acetate monomer to monomer (b) in the first incremental addition is greater than about 4.5 until about 40-60% of the total monomer charge is added, and thereafter, in a second incremental addition, the ratio of vinyl acetate monomer to monomer (b) is less than about 4.5 until the remaining amount of monomers is added to the reactor.
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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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |