Patent US4264469A successfully refreshed from Google Patents.
US4264469A
Expired / Lapsed
US
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Cellular thermoplastic resins with mixed blowing agents
Assignee: Resonac Corp
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Filing: 1979-07-23
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Granted: 1981-04-28
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Expires: 1999-07-23
Abstract
Abstract Thermoplastic resin foams such as polyethylene foams having excellent appearance can be produced with high foaming stability by using a blowing agent composition comprising (a) azodicarbonamide, (b) dinitrosopentamethylenetetramine, and (c) a phenolic or propionate compound such as 1,3,5-tris(3,5-di-t-butyl-4-hydroxybenzyl)-s-triazine-2-4-6-(1H, 3H, 5H)trion.
Inventors
- 👤 Yutaka Yamaguchi
- 👤 Atsuo Sasama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/04; C08J9/06; C08J9/10; C08J9/102; C08J9/103; C08J9/107; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/91
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A blowing agent composition for use in the production of cellular thermoplastic resins comprising: (a) azodicarbonamide, (b) dinitrosopentamethylenetetramine, and (c) at least one third component selected from the group consisting of octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate, 2,2'-thiodiethylbis-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate], pentaerythrityl-tetrakis-[3-(3,5-di-t-butylhydroxyphenyl)-propionate], 1,3,5-tris-(3,5-di-t-butyl-4-hydroxybenzyl)-s-triazine-2-4-6-(1H, 3H, 5H)trion, 2,2'-methylenebis-(4-ethyl-6-t-butylphenol), 2,5-di-t-butylhydroquinone, 2,5-di-t-amylhydroquinone, distearyl-3,3'-thiodipropionate, and 2,6-di-t-butyl-4-methylphenol, wherein component (b) is present in the amount of from 3 to 30 parts by weight based on 100 parts by weight of component (a), and component (c) is present in the amount of 0.5 to 10 parts by weight based on 100 parts by weight of components (a) and (b).
Claim 2
Dependent Claim
94 words
A blowing agent composition for use in the production of cellular thermoplastic resins comprising: (a) azodicarbonamide, (b) dinitrosopentamethylenetetramine, and (c) at least one third component selected from the group consisting of octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate, 2,2'-thiodiethylbis-[3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate], pentaerythrityl-tetrakis-[3-(3,5-di-t-butylhydroxyphenyl)-propionate], 1,3,5-tris-(3,5-di-t-butyl-4-hydroxybenzyl)-s-triazine-2-4-6-(1H, 3H, 5H)trion, 2,2'-methylenebis-(4-ethyl-6-t-butylphenol), 2,5-di-t-butylhydroquinone, 2,5-di-t-amylhydroquinone, distearyl-3,3'-thiodipropionate, and 2,6-di-t-butyl-4-methylphenol, wherein component (b) is present in the amount of from 3 to 30 parts by weight based on 100 parts by weight of component (a), and component (c) is present in the amount of 0.5 to 10 parts by weight based on 100 parts by weight of components (a) and (b).
Claim 3
Dependent Claim
21 words
A blowing agent composition according to claim 1, wherein the component (c) is 1,3,5-tris(3,5-di-t-butyl-4-hydroxybenzyl)-S-triazine-2-4-6-(1H, 3H, 5H)trion, 2,5-di-t-butylhydroquinone, octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)-propionate, 2,6-di-t-butyl-4-methylphenol, or distearylthiodipropionate.
Claim 4
Dependent Claim
15 words
A blowing agent composition according to claim 1, wherein the thermopoastic resin is a polyolefin.
Claim 5
Dependent Claim
13 words
A blowing agent composition according to claim 3, wherein the polyolefin is polyethylene.
Claim 6
Dependent Claim
32 words
A blowing agent composition according to claim 1, including a thermoplastic resin selected from the group consisting of polypropylene, polybutene-1, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and vinyl chloride-ethylene copolymer.
Claim 7
Dependent Claim
30 words
A blowing agent composition according to claim 3, wherein the amount of the component (c) is 0.1 to 1.0 parts by weight per 100 parts by weight of the polyolefin.
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) | 1984-04-27 | 1984-10-27 | 1985-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-27 | 1988-10-27 | 1989-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-27 | 1992-10-27 | 1993-04-28 | $7700.00 | Window Closed / Lapsed |