Patent US3725367A successfully refreshed from Google Patents.
US3725367A
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US
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Preparation with seeding of polymers insoluble in their monomeric compositions
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1970-05-15
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Granted: 1973-04-03
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Expires: 1990-05-15
Abstract
Abstract Vinyl based polymers and copolymers and method for the preparation of same by first preparing a seeding latex by polymerization in fine suspension of monomers or comonomers having a vinyl base, preferably vinyl chloride, with an excess amount of organo-soluble catalyst and dispersing the seeding latex in monomers or comonomers having the vinyl base to form a polymerizing composition which is polymerized by heating.
Inventors
- 👤 T Kemp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:01
CPC Classifications
C; C08; C08F; C08F259/00; C08F259/02; C08F259/04; Y; Y10; Y10S; Y10S526/00; Y10S526/909
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
88 words
A process for the preparation of polymers and copolymers having a vinyl base as claimed in claim 1 in which the seeding latex is prepared by polymerizing in fine suspension monomers or comonomers having a vinyl base with an amount of organo-soluble catalyst in excess of that required to polymerize the monomer to form an aqueous seeding latex in which the polymer or copolymer particles contain excess catalyst of the organo-soluble type and are present in an amount of at least 30 percent by weight of the latex.
Claim 2
Dependent Claim
16 words
The process as claimed in claim 2 in which the vinyl base material is vinyl chloride.
Claim 3
Dependent Claim
20 words
The process as claimed in claim 2 in which the polymerizing composition is subjected to polymerization under relatively mild agitation.
Claim 4
Dependent Claim
30 words
The process as claimed in claim 2 in which the amount of polymer or copolymer in the seeding latex is within the range of 40 to 45 percent by weight.
Claim 5
Dependent Claim
29 words
The process as claimed in claim 2 in which the polymer or copolymer particles of the seeding latex have a diameter within the range of 0.03 to 4 microns.
Claim 6
Dependent Claim
29 words
The process as claimed in claim 2 in which the polymer or copolymer particles of the seeding latex have a diameter within the range of 0.1 to 2 microns.
Claim 7
Dependent Claim
46 words
The process as claimed in claim 2 in which the amount of organo-soluble type of catalyst introduced with the monomers or comonomers used for preparing the seeding latex is within the range of 0.5 to 5 percent by weight based upon the monomeric or comonomeric composition.
Claim 8
Dependent Claim
25 words
The process as claimed in claim 2 in which the organo-soluble catalyst used in the preparation of the seeding latex is an organic peroxide catalyst.
Claim 9
Dependent Claim
26 words
The process as claimed in claim 9 in which the catalyst is selected from the group consisting of lauroyl peroxide, tertiobutyl diethylperacetate, diethylhexylpercarbonate and diacetyl peroxide.
Claim 10
Dependent Claim
49 words
The process as claimed in claim 2 in which the amount of polymer or copolymer of the seeding latex dispersed with the monomer or comonomer of the polymerizing composition is within the range of 2 to 6 percent by weight of the monomer or comonomer of the polymerizing composition.
Claim 11
Dependent Claim
34 words
The process as claimed in claim 2 in which a dispersing agent is introduced in the polymerization composition via the seeding latex, or with the monomer or comonomers into which the latex is dispersed.
Claim 12
Dependent Claim
17 words
The process as claimed in claim 12 in which the dispersing agent is of the emulsifying type.
Claim 13
Dependent Claim
16 words
The process as claimed in claim 12 in which the dispersing agent comprises a protective colloid.
Claim 14
Dependent Claim
27 words
The process as claimed in claim 13 in which the dispersing agent is an anionic agent selected from the group consisting of alkali metal sulphonates and sulphosuccinates.
Claim 15
Dependent Claim
36 words
The process as claimed in claim 13 in which the dispersing agent is of a non-ionic type selected from the group consisting of ethylene polyoxide grafted by styrene or vinyl acetate, or a fatty acid polyethoxyester.
Claim 16
Dependent Claim
30 words
The process as claimed in claim 12 in which the dispersing agent is present in an amount less than 2 percent by weight of the monomeric or comonomeric polymerizing composition.
Claim 17
Dependent Claim
36 words
The process as claimed in claim 12 in which the dispersing agent is present in an amount within the range of 0.1 to 0.3 percent by weight of the monomer or comonomers of the polymerizing composition.
Claim 18
Dependent Claim
27 words
The process as claimed in claim 14 in which the protective colloid is selected from the group consisting of methyl cellulose, polyvinyl alcohol, carboxy cellulose and gelatin.
Claim 19
Dependent Claim
49 words
The process as claimed in claim 2 in which the monomers and comonomers polymerized are selected from the group consisting of vinyl chloride; vinyl chloride and at least one olefin; vinyl chloride and vinyl acetate; vinyl chloride, vinyl acetate and at least one olefin; vinyl chloride and vinylidene chloride.
Claim 20
Dependent Claim
25 words
The process as claimed in claim 20 in which the olefin is selected from the group consisting of ethylene, propylene, butene-1, butene-2, isobutene, and methyl-4-pentene-1.
Claim 21
Dependent Claim
29 words
The process as claimed in claim 2 in which an activator is introduced via the seeding latex or with the monomer or comonomer into which the latex is dispersed.
Claim 22
Dependent Claim
57 words
The process as claimed in claim 22 in which when the activator is introduced via the seeding latex it is selected from the group consisting of ammonia, sodium sulphoxylate formaldehyde and sodium metabisulphite and when the activator is introduced with the monomer or comonomer it is selected from the group consisting of ascorbyl palmitate and hydroxymaleic acid.
Claim 23
Dependent Claim
37 words
The process as claimed in claim 22 in which the activator is used in molar dosages less than 1 based upon the catalyst or catalysts of the organo-soluble type contained in the particles of the seeding latex.
Claim 24
Dependent Claim
40 words
The process as claimed in claim 2 in which the amount of catalyst contained in the particles of the seeding latex is sufficient for polymerization of the monomeric or comonomeric materials to a conversion rate in excess of 70 percent.
Claim 25
Dependent Claim
27 words
The process as claimed in claim 2 in which the polymerizing composition is heated to a temperature within the range of 1* to 90* C for polymerization.
Claim 26
Dependent Claim
27 words
The process as claimed in claim 2 in which the polymerizing composition is heated to a temperature within the range of 30* to 70* C for polymerization.
Claim 27
Dependent Claim
26 words
The process as claimed in claim 1 in which the polymer is coagulated within the droplets when the polymer particle content is about 50% by weight.
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |