Patent US4011283A successfully refreshed from Google Patents.
US4011283A
Expired / Lapsed
US
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Polymerization process
Assignee: BP Chemicals Ltd
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Filing: 1973-03-19
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Granted: 1977-03-08
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Expires: 1993-03-19
Abstract
Abstract Non-film forming polymers produced as an aqueous emulsion are recovered by adding a monomer and polymerizing under suspension conditions.
Inventors
- 👤 Alan Charles Sturt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:03
CPC Classifications
C; C08; C08F; C08F291/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A process which comprises polymerising under emulsion polymerisation conditions a first monomeric material other than vinyl chloride that gives rise to a non-film forming polymer having a glass transition temperature above 10° C in aqueous emulsion, said first monomeric material being selected from the group consisting of ethylene, propylene, styrene, acrylonitrile, methyl methacrylate, a vinyl ester, butadiene, isoprene, chloroprene, ethyl acrylate and mixtures thereof, allowing the emulsion polymer to absorb an amount of a second monomeric material selected from the group consisting of ethylene, propylene, styrene, acrylonitrile, methyl methacrylate, a vinyl ester, butadiene, isoprene, chloroprene, ethyl acrylate, vinyl chloride, and mixtures thereof not greater than the weight of the emulsion polymer, destroying the emulsion by adding an acid or a multivalent ion in the presence of a suspension stabilising system, and polymerising the absorbed second monomeric material under suspension polymerising conditions.
Claim 2
Dependent Claim
141 words
A process which comprises polymerising under emulsion polymerisation conditions a first monomeric material other than vinyl chloride that gives rise to a non-film forming polymer having a glass transition temperature above 10° C in aqueous emulsion, said first monomeric material being selected from the group consisting of ethylene, propylene, styrene, acrylonitrile, methyl methacrylate, a vinyl ester, butadiene, isoprene, chloroprene, ethyl acrylate and mixtures thereof, allowing the emulsion polymer to absorb an amount of a second monomeric material selected from the group consisting of ethylene, propylene, styrene, acrylonitrile, methyl methacrylate, a vinyl ester, butadiene, isoprene, chloroprene, ethyl acrylate, vinyl chloride, and mixtures thereof not greater than the weight of the emulsion polymer, destroying the emulsion by adding an acid or a multivalent ion in the presence of a suspension stabilising system, and polymerising the absorbed second monomeric material under suspension polymerising conditions.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1 wherein the polymer to second monomeric material ratio lies in the range 70:30 to 92.5:7.5.
Claim 4
Dependent Claim
32 words
A process as claimed in claim 1 wherein the first monomeric material gives rise to an acrylonitrile/polybutadiene/styrene copolymer (ABS resin) and the second monomeric material is a mixture of styrene and acrylonitrile.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 3 wherein the mixture of styrene and acrylonitrile amounts to about 10% by weight of the first stage emulsion acrylonitrile/polybutadiene styrene copolymer.
Claim 6
Dependent Claim
47 words
A process as claimed in claim 1 wherein the emulsifying agent used in the first stage polymerisation is the salt of a carboxylic acid which is not an emulsifying agent and the emulsion system is transformed into a suspension system by the addition thereto of an acid.
References Cited (Backward Citations)
US3370105A
Cited
US3436440A
Cited
US3548034A
Cited
US3663655A
Cited
US3663657A
Cited
US3657172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |