US3673129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic resin multicellular product whose main component is acrylonitrile and process for preparation thereof
Assignee: Sekisui Chemical Co Ltd
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Filing: 1969-12-19
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Granted: 1972-06-27
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Expires: 1989-12-19
Abstract
Abstract Process for preparing multicellular products which comprises mixing urea and/or a urea derivative, and an acid with a monomeric mixture comprising 60-95 percent by weight of acrylonitrile and 40-5 percent by weight of a vinyl monomer copolymerizable with acrylonitrile, polymerizing the mixture with the use of catalyst and/or by irradiation, and thereafter heating the resulting polymer at 100*-250* C.; and multicellular products produced by the above process, in which fine cells having an average diameter of less than 1.0 mm are substantially uniformly dispersed in the polymer and which product has a specific gravity of less than 0.3 g/cm3.
Inventors
- 👤 Norio Sagane
- 👤 Issei Kuwazuru
- 👤 Isao Kaetsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08F; C08F20/00; C08F20/02; C08F20/42; C08J2333/00; C08J2333/18; C08J2333/20; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A process for the preparation of a multicellular product which comprises mixing at least one substance selected from the group consisting of H2 NCONH2 and H2NCONHR wherein R is selected from the group consisting of alkyl, cycloalkyl, acyl and phenyl, an acid which is substantially nonvolatile at room temperature under atmospheric pressure and which has a disassociation constant greater than 10 5 and water with a monomer mixture consisting essentially of 60-95 percent by weight of acrylonitrile and 40-5 percent by weight of a vinyl monomer seLected from the group consisting of acrylic acid ester, methacrylic acid ester, and vinyl acetate, polymerizing the entire mixture and thereafter heating the obtained polymer at 100*-250* C to form the polymer.
Claim 2
Dependent Claim
35 words
A process according to claim 2 wherein the amount of said substance is 2-15 percent by weight and the amount of the acid is 10-45 percent by weight based on the entire mixture before polymerization.
Claim 3
Dependent Claim
11 words
A process according to claim 2 wherein said substance is urea.
Claim 4
Dependent Claim
15 words
A process according to claim 2 wherein the polymerization is employed using a polymerization catalyst.
Claim 5
Dependent Claim
16 words
A process according to claim 2 wherein the polymerization is carried out by irradiating said mixture.
Claim 6
Dependent Claim
20 words
A process according to claim 2 wherein the polymerization is carried out using a polymerization catalyst and irradiating the mixture.
Claim 7
Dependent Claim
35 words
A process according to claim 2 wherein the acid is at least one substance selected from the group consisting of sulfuric acid, phosphoric acid, pyrophosphoric acid, formic acid, acetic acid, propionic acid and benzoic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |