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Patent US3960787A successfully refreshed from Google Patents.
US3960787A
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Process for preparing foamable synthetic resin granules
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1974-06-06
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Granted: 1976-06-01
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Expires: 1994-06-06
Abstract
Abstract In a process for preparing foamable synthetic resin granules by suspension polymerization, a fatty acid bisamide is added prior to or at an early stage of polymerization in the presence of an inorganic salt and a foaming agent is added at a later stage of polymerization or after completion thereof.
Inventors
- 👤 Hiroji Isukamoto
- 👤 Hisashi Morikawa
- 👤 Masao Nakagawa
- 👤 Shinji Kato
- 👤 Masaki Miyamoto
- 👤 Toichiro Yoda
- 👤 Katsuhiko Yoshihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:26
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; C08J9/0014; C08J9/0028; C08J2325/00; C08J2325/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
117 words
Process for preparing foamable synthetic resin comprising the steps of suspension polymerizing styrene, styrene derivative or monomer mixtures of 50% by weight or more of styrene, adding fatty acid bisamide of the formula ##EQU2## where R and R' are alkyl group, and n is an integer from 1 to 6, to the polymerization system prior to polymerization or before the polymerization has proceded 15% of said polymerization step in the presence of a suspension agent, an initiator and inorganic salt selected from the group consisting of sodium tripolyphosphate, potassium sulfate and sodium sulfate, and adding at least a normally gaseous foaming agent to said polymerization system at a late stage of polymerization or after completion of polymerization.
Claim 2
Dependent Claim
117 words
Process for preparing foamable synthetic resin comprising the steps of suspension polymerizing styrene, styrene derivative or monomer mixtures of 50% by weight or more of styrene, adding fatty acid bisamide of the formula ##EQU2## where R and R' are alkyl group, and n is an integer from 1 to 6, to the polymerization system prior to polymerization or before the polymerization has proceded 15% of said polymerization step in the presence of a suspension agent, an initiator and inorganic salt selected from the group consisting of sodium tripolyphosphate, potassium sulfate and sodium sulfate, and adding at least a normally gaseous foaming agent to said polymerization system at a late stage of polymerization or after completion of polymerization.
Claim 3
Dependent Claim
11 words
Foamable synthetic resin granules produced by the process of claim 1.
Claim 4
Dependent Claim
24 words
Process of claim 1, wherein said monomers are selected from the group consisting of methyl acrylate, butyl acrylate, acrylonitrile, methacrylonitrile, butadiene and mixtures thereof.
Claim 5
Dependent Claim
30 words
Process of claim 1, wherein said foaming agent is an aliphatic hydrocarbon selected from the group consisting of ethane, propane, butane, isobutane, freon, dimethyl ether, methyl chloride and mixtures thereof.
Claim 6
Dependent Claim
21 words
Process of claim 1, wherein said fatty acid bisamide is added in an amount ranging from 0.01 to 3.0 weight percent.
Claim 7
Dependent Claim
31 words
Process of claim 5, wherein said fatty acid bisamide is selected from the group consisting of bislauric acid amide, ethylene acid amide, ethylene bisoleic acid amide, methylene bisstearamide and hexamethyl bisstearamide.
Claim 8
Dependent Claim
23 words
Process of claim 1, wherein said fatty acid bisamide is added to said polymerization system when it is polymerized about 10% or less.
Claim 9
Dependent Claim
21 words
Process of claim 1, wherein said foaming agent is added to said polymerization when said polymerization was 90% or more complete.
Claim 10
Dependent Claim
21 words
Process of claim 1, wherein said fatty acid bisamide is used together with a higher fatty acid containing 12-24 carbon atoms.
Claim 11
Dependent Claim
27 words
Process of claim 9, wherein said higher fatty acid is selected from the group consisting of lauric acid, palmitric acid, myristic acid, stearic acid and oleic acid.
Claim 12
Dependent Claim
12 words
Process of claim 1, wherein said alkyl group contains 7-23 carbon atoms.
Claim 13
Dependent Claim
23 words
Process of claim 1, wherein 0.3 parts of said fatty acid bisamide is added to 100 parts of styrene in said polymerization system.
Claim 14
Dependent Claim
22 words
Process of claim 1, wherein the temperature of polymerization ranges from 90° to 100°C, and in an atmosphere of nitrogen or air.
References Cited (Backward Citations)
US2983692A
Cited
US3389097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |