US3876494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binding materials having good texture and high impact resistance
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1974-01-02
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Granted: 1975-04-08
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Expires: 1994-01-02
Abstract
Abstract A binding material having a good texture and high impact resistance is produced by melt-extruding a mixture of a foaming agent and a polypropylene composition consisting essentially of 40 to 75 percent by weight of crystalline polypropylene and 25 to 60 percent by weight of non-crystalline polypropylene, up to 60 percent by weight of which may be replaced by low density polyethylene, into a foamed polypropylene sheet, subjecting the foamed sheet to hinge-processing to provide the sheet with hinge portion. The foamed polypropylene sheet may be embossed prior to cooling the sheet to solidify the same.
Inventors
- 👤 Tomio Ogawa
- 👤 Taro Harada
- 👤 Nobuo Ito
- 👤 Kanemitsu Ohishi
- 👤 Yoshifumi Nishibayashi
- 👤 Kazunobu Shiozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:26
CPC Classifications
B; B42; B42F; B42F13/00; B42F13/0006; B42F13/0013; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C44/5627; B29C44/5636; B29C53/00; B29C53/02; B29C53/04; B29C53/06; B42D; B42D3/00; B42D3/02; B29C37/00; B29C37/0053; B29C37/0057; B29C43/00; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2105/00; B29K2105/04; B29L; B29L2031/00; B29L2031/705; B29L2031/7052; Y; Y10; Y10S; Y10S264/00; Y10S264/04; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1026; Y10T156/1028; Y10T156/1031; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24198; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
49 words
A BINDING MATERIAL HAVING A GOOD TEXTURE AND HIGH IMPACT RESISTANCE WHICH CONSISTS OF A FOAMED SHEET OF A POLYPROPYLENE COMPOSITION CONSISTING ESSENTIALLY OF 40 TO 75 PERCENT BY WEIGHT OF CRYSTALLING POLYPROPYLENE AND 25 TO 60 BY WEIGHT OF NON-CRYSTALLINE POLYPROPYLENE, THE FOAMED SHEET HAVING A HINGE PORTION.
Claim 2
Dependent Claim
49 words
A BINDING MATERIAL HAVING A GOOD TEXTURE AND HIGH IMPACT RESISTANCE WHICH CONSISTS OF A FOAMED SHEET OF A POLYPROPYLENE COMPOSITION CONSISTING ESSENTIALLY OF 40 TO 75 PERCENT BY WEIGHT OF CRYSTALLING POLYPROPYLENE AND 25 TO 60 BY WEIGHT OF NON-CRYSTALLINE POLYPROPYLENE, THE FOAMED SHEET HAVING A HINGE PORTION.
Claim 3
Dependent Claim
23 words
A binding material according to claim 1, wherein up to 60 percent by weight of the non-crystalline polypropylene is replaced by low density
Claim 4
Dependent Claim
33 words
A binding material according to claim 1, wherein the polypropylene composition consists of 50 to 75 percent by weight of the crystalline polypropylene and 25 to 50 percent by weight of the non-crystalline
Claim 5
Dependent Claim
23 words
A binding material according to claim 3, wherein up to 50 percent by weight of the non-crystalline polypropylene is replaced by low density
Claim 6
Dependent Claim
28 words
A binding material according to claim 1, wherein the crystalline polypropylene is selected from the group consisting of crystalline homopolymer of propylene and crystalline copolymers of propylene and
Claim 7
Dependent Claim
35 words
A binding material according to claim 2, wherein the low density polyethylene has a specific gravity of 0.94 or less and is selected from the group consisting of homopolymer of ethylene and copolymers of ethylene
Claim 8
Dependent Claim
13 words
A binding material according to claim 1, wherein the foamed sheet has a
Claim 9
Dependent Claim
13 words
A binding material according to claim 1, wherein the foamed sheet has an
Claim 10
Dependent Claim
19 words
A binding material according to claim 1, wherein the foamed sheet has a foaming ratio of 1.2 to 2.0.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |