US4079101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diolefin polymerization process in the presence of seed polymers
Assignee: Standard Oil Co
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Filing: 1975-09-02
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Granted: 1978-03-14
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Expires: 1995-09-02
Abstract
Abstract A polymerization process is described in which conjugated diolefin polymers are prepared by free-radical polymerization at improved rates by conducting the polymerization in a batch charge of all ingredients in aqueous emulsion in the presence of some preformed seed polymer having small particle size.
Inventors
- 👤 June T. Duke
- 👤 Dorothy C. Prem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:51
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F265/00; C08F265/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A process for the preparation of a polymer blend comprising homopolymerizing a monomer selected from the group consisting of butadiene and isoprene in a batch charge in aqueous emulsion in the presence of a free-radical polymerization initiator and from about 5 to 160 parts by weight per 100 parts by weight of said diene monomer of a seed polymer selected from the group consisting of polymethacrylonitrile, copolymers of methacrylonitrile with up to about 20% by weight of another monovinyl monomer, polymethyl acrylate, polymethyl methacrylate, polyacrylonitrile, and acrylonitrile copolymers with up to 30% by weight of another monovinyl monomer, said seed polymer having an average particle size of from about 300 to about 1000 A, the final polymer being a blend containing said seed polymer said hompolymerization being conducted at improved polymerization rates, said blend being the homopolymer product and said seed polymer.
Claim 2
Dependent Claim
142 words
A process for the preparation of a polymer blend comprising homopolymerizing a monomer selected from the group consisting of butadiene and isoprene in a batch charge in aqueous emulsion in the presence of a free-radical polymerization initiator and from about 5 to 160 parts by weight per 100 parts by weight of said diene monomer of a seed polymer selected from the group consisting of polymethacrylonitrile, copolymers of methacrylonitrile with up to about 20% by weight of another monovinyl monomer, polymethyl acrylate, polymethyl methacrylate, polyacrylonitrile, and acrylonitrile copolymers with up to 30% by weight of another monovinyl monomer, said seed polymer having an average particle size of from about 300 to about 1000 A, the final polymer being a blend containing said seed polymer said hompolymerization being conducted at improved polymerization rates, said blend being the homopolymer product and said seed polymer.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the preparation is carried out at a temperature in the range of from about 0° C to 100° C in the substantial absence of oxygen.
Claim 4
Dependent Claim
25 words
The process of claim 2 wherein the seed polymer is a copolymer of 95% by weight of methacrylonitrile and 5% by weight of methyl methacrylate.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein the seed polymer is polymethyl acrylate.
Claim 6
Dependent Claim
12 words
The process of claim 2 wherein the seed polymer is polymethyl methacrylate.
Claim 7
Dependent Claim
23 words
The process of claim 2 wherein the seed polymer is a copolymer of 75% by weight acrylonitrile and 25% by weight methyl acrylate.
References Cited (Backward Citations)
US3397165A
Cited
US3372134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |