Patent US4371677A successfully refreshed from Google Patents.
US4371677A
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Process for making dispersion copolymers through monomer metering
Assignee: Geon Co
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Filing: 1981-09-14
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Granted: 1983-02-01
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Expires: 2001-09-14
Abstract
Abstract The present invention relates to a process for producing low energy dispersion vinyl copolymers which, in a plastisol, can be fused at lower temperatures or in a shorter period of time than presently available dispersion vinyl copolymers. It has been found that if, instead of adding all the comonomer batchwise prior to the start of the reaction, the comonomer, such as methyl acrylate, for example, is metered into the reactor continuously, or intermittently, during all or part of the polymerization reaction period, a dispersion vinyl copolymer is produced that has a lower plastisol viscosity for a given comonomer content. Plastisols made from the vinyl copolymers of the present invention have good flow properties and the fused films made therefrom have high gloss, high clarity and good mechanical strength, even when fused at low temperatures.
Inventors
- 👤 Marion G. Morningstar
- 👤 Thomas J. Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:45
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
183 words
A process for producing vinyl dispersion copolymers of vinyl and vinylidene halides with a comonomer selected from the group consisting of acrylic acid, methacrylic acid, esters of acrylic acid, and esters of methacrylic acid, comprising forming a monomer premix containing a vinyl or vinylidene halide, the aqueous reaction medium, from about 0.02% to about 0.4% by weight of a free radical yielding initiator(s) based on the weight of 100 parts of monomer being copolymerized, at least one emulsifier, and at least one long straight chain saturated alcohol containing from 8 to 24 carbon atoms, the ratio of alcohol to emulsifier being in the range of about 0.25 to about 2.5, homogenizing said premix below the reactivity of the catalyst(s) employed, passing said homogenized premix to a reaction zone, emulsion polymerizing said homogenized premix in said zone at a temperature in the range of about 35° C. to about 60° C., metering said comonomer into said reaction zone during the polymerization reaction, said metering being substantially stopped prior to about 2 hours prior to the completion of the reaction, and thereafter recovering the copolymer.
Claim 2
Dependent Claim
183 words
A process for producing vinyl dispersion copolymers of vinyl and vinylidene halides with a comonomer selected from the group consisting of acrylic acid, methacrylic acid, esters of acrylic acid, and esters of methacrylic acid, comprising forming a monomer premix containing a vinyl or vinylidene halide, the aqueous reaction medium, from about 0.02% to about 0.4% by weight of a free radical yielding initiator(s) based on the weight of 100 parts of monomer being copolymerized, at least one emulsifier, and at least one long straight chain saturated alcohol containing from 8 to 24 carbon atoms, the ratio of alcohol to emulsifier being in the range of about 0.25 to about 2.5, homogenizing said premix below the reactivity of the catalyst(s) employed, passing said homogenized premix to a reaction zone, emulsion polymerizing said homogenized premix in said zone at a temperature in the range of about 35° C. to about 60° C., metering said comonomer into said reaction zone during the polymerization reaction, said metering being substantially stopped prior to about 2 hours prior to the completion of the reaction, and thereafter recovering the copolymer.
Claim 3
Dependent Claim
17 words
A process as defined in claim 1 wherein the vinyl halide in the premix is vinyl chloride.
Claim 4
Dependent Claim
13 words
A process as defined in claim 1 wherein the comonomer is methyl acrylate.
Claim 5
Dependent Claim
13 words
A process as defined in claim 1 wherein the comonomer is ethyl acrylate.
Claim 6
Dependent Claim
21 words
A process as defined in claim 1 wherein the comonomer is metered into the reaction zone continuously at a constant rate.
Claim 7
Dependent Claim
17 words
A process as defined in claim 1 wherein the comonomer is metered into the reaction zone intermittently.
Claim 8
Dependent Claim
22 words
A process as defined in claim 1 wherein the copolymer contains from about 1.0% to about 15% by weight of the comonomer.
Claim 9
Dependent Claim
22 words
A process as defined in claim 1 wherein the alcohol is a mixture of two alcohols containing 12 C's and 18 C's.
Claim 10
Dependent Claim
16 words
A process as defined in claim 1 wherein the initiator is secbutyl peroxydicarbonate and lauroyl peroxide.
Claim 11
Dependent Claim
13 words
A process as defined in claim 1 wherein the initiator is diisononanoyl peroxide.
Claim 12
Dependent Claim
13 words
A process as defined in claim 1 wherein the initiator is 2-ethylhexyl peroxydicarbonate.
Claim 13
Dependent Claim
21 words
A process as defined in claim 1 wherein the emulsifier is the sodium salt of sulfated nonyl phenoxy poly (ethyleneoxy) ethanol.
Claim 14
Dependent Claim
13 words
A process as defined in claim 2 wherein the comonomer is methyl acrylate.
Claim 15
Dependent Claim
13 words
A process as defined in claim 2 wherein the comonomer is ethyl acrylate.
Claim 16
Dependent Claim
35 words
A process as defined in claim 1 wherein the amount of emulsifier is in the range of about 0.5% to about 2.0% by weight based on the weight of 100 parts of monomers being copolymerized.
Claim 17
Dependent Claim
36 words
A process as defined in claim 13 wherein the methyl acrylate is metered into the reaction zone continuously at a constant rate up to 2 to about 6 hours prior to the completion of the reaction.
Claim 18
Dependent Claim
22 words
A process as defined in claim 16 wherein the alcohol is a mixture of two alcohols containing 12 C's and 18 C's.
Claim 19
Dependent Claim
16 words
A process as defined in claim 17 wherein the initiator is secbutyl peroxydicarbonate and lauroyl peroxide.
Claim 20
Dependent Claim
41 words
A process as defined in claim 18 wherein the premix contains from about 0.5% to about 2.0% by weight based on the weight of 100 parts of monomers being copolymerized of the sodium salt or sulfated nonyl phenoxy poly (ethyleneoxy) ethanol.
Claim 21
Dependent Claim
25 words
A process as defined in claim 19 wherein the copolymer contains from about 1.0% to about 15% by weight of methyl acrylate in copolymerized form.
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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) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |