US3949028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cellular polymeric shaped articles having relief patterns
Assignee: Eiwa Chemical Industries Co Ltd
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Filing: 1974-10-23
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Granted: 1976-04-06
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Expires: 1994-10-23
Abstract
Abstract A method of making cellular or expanded polymeric shaped articles having relief patterns which comprises forming a thermoplastic polymer composition containing azodicarbonamide as a chemical blowing agent into a desired shape, irradiating a surface of the shaped body thus obtained with light of wave lengths of 100 to 500 mμ through a printed pattern applied thereto or a screen which locally shades light rays, such as a stencil or a positive or negative transparency, superposed thereon and heating the shaped body to effect foaming or expansion thereof.
Inventors
- 👤 Shinji Murakami
- 👤 Kazuo Okuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:18
CPC Classifications
B; B44; B44C; B44C3/00; B44C3/04; B44C3/044; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C59/00; B29C59/16; B44C1/00; B44C1/20; B44C1/205; C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/102; C08J9/103; D; D06; D06N; D06N7/00; D06N7/0005; D06N7/0007; D06N7/0013; D06N7/0023; G; G03; G03C; G03C1/00; G03C1/695; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0827; B29C2035/0833; B29C37/00; B29C2037/80; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2027/00; B29K2027/06; B29K2031/00; B29K2031/04; B29K2105/00; B29K2105/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24661
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A method of making cellular polymeric shaped articles having a relief pattern on their surfaces comprising forming thermoplastic polymer composition containing 0.2 to 20 parts by weight of azodicarbonamide per 100 parts by weight of the polymer into a desired shape, printing a pattern on the surface of the shaped body, irradiating the printed shaped body with light rays of wave lengths 100 to 500 mμ for 1 to 60 minutes and heating the irradiated body to effect expansion of the composition in the non-irradiated areas.
Claim 2
Independent Claim
86 words
A method of making cellular polymeric shaped articles having a relief pattern on their surfaces comprising forming thermoplastic polymer composition containing 0.2 to 20 parts by weight of azodicarbonamide per 100 parts by weight of the polymer into a desired shape, printing a pattern on the surface of the shaped body, irradiating the printed shaped body with light rays of wave lengths 100 to 500 mμ for 1 to 60 minutes and heating the irradiated body to effect expansion of the composition in the non-irradiated areas.
Claim 3
Dependent Claim
24 words
A method of claim 1 in which the irradiated shaped body is heated to a temperature above the decomposition temperature of the azodicarbonamide contained.
Claim 4
Dependent Claim
18 words
A method of claim 1 in which the light is of wave lengths of 200 to 400 mμ.
Claim 5
Dependent Claim
12 words
A method of claim 1 in which the polymer is polyvinyl chloride.
Claim 6
Dependent Claim
11 words
A method of claim 1 in which the polymer is polyethylene.
Claim 7
Dependent Claim
14 words
A method of claim 1 in which the polymer is an ethylene-vinyl acetate copolymer.
References Cited (Backward Citations)
US3864143A
Cited
US3836624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |