Patent US4878972A successfully refreshed from Google Patents.
US4878972A
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Process for preparing two-ply foam molded articles
Assignee: Prime Polymer Co Ltd
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Filing: 1988-08-18
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Granted: 1989-11-07
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Expires: 2008-08-18
Abstract
Abstract A process for preparing a two-ply foam molded article, characterized by heating a foamable polyolefin sheet which is in its not yet foamed state to form a foamed polyolefin layer, integrally laminating a fabric on one side of the resulting foamed polyolefin layer which is still in a melted and softened state to form a laminate and simultaneously draw-forming the resulting laminate to shape the two-ply foam molded article.
Inventors
- 👤 Katsutoshi Kaneko
- 👤 Toshio Kobayashi
- 👤 Mitsuru Watari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:35
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/10; B32; B32B; B32B5/00; B32B5/18; B29C44/12; B29C44/14; B29C51/00; B29C51/14; B29C51/145; B32B27/00; B32B27/12; B32B5/02; B32B5/022; B32B5/22; B32B5/24; B32B5/245; B29K; B29K2023/00; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/08; B29K2105/0854; B29K2105/25; B29K2105/253; B29L; B29L2009/00; B29L2031/00; B29L2031/30; B29L2031/3005; B29L2031/732; B29L2031/7322; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2305/00; B32B2305/10; B32B2305/20; B32B2601/00; B32B2605/00; B32B2605/003; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T156/1048; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
75 words
A process for preparing a two-ply foam molded article, characterized by heating to a melted and softened state a foamable polyolefin sheet which is in its not yet foamed state to form a foamed polyolefin layer, integrally laminating a fabric on one side of the resulting foamed polyolefin layer which is still in a melted and softened state to form a laminate and simultaneously drawforming the resulting laminate to shape the two-ply foam molded article.
Claim 2
Dependent Claim
75 words
A process for preparing a two-ply foam molded article, characterized by heating to a melted and softened state a foamable polyolefin sheet which is in its not yet foamed state to form a foamed polyolefin layer, integrally laminating a fabric on one side of the resulting foamed polyolefin layer which is still in a melted and softened state to form a laminate and simultaneously drawforming the resulting laminate to shape the two-ply foam molded article.
Claim 3
Dependent Claim
34 words
The process as claimed in claim 1 wherein the foamable polyolefin sheet is formed from a composition comprising (A) a polyolefin, (B) a crosslinking agent, (C) a foaming agent, and (D) an organic peroxide.
Claim 4
Dependent Claim
14 words
The process as claimed in claim 1 wherein the polyolefin is polyethylene or polypropylene.
Claim 5
Dependent Claim
14 words
The process as claimed in claim 1 wherein the fabric is a nonwoven fabric.
Claim 6
Dependent Claim
25 words
The process as claimed in claim 2 wherein the crosslinking agent (B) is an oxime compound, a nitroso compound, a maleimide compound or mixtures thereof.
Claim 7
Dependent Claim
32 words
The process as claimed in claim 2 wherein the crosslinking agent (B) is present in an amount of 0.1-1 part by weight based on 100 parts by weight of the polyolefin (A).
Claim 8
Dependent Claim
28 words
The process as claimed in claim 2 wherein the foaming agent (C) is azodicarbonamide, barium azodicarboxylate, N,N'-dinitrosopentamethylene tetramine, 4,4-oxybis(benzenesulfonyl-hydrazide), diphenylsulfone-3,3-disulfonyl hydrazide, p-toluene-sulfonyl semicarbazide, trihydrazinotriazine, biurea or zinc carbonate.
Claim 9
Dependent Claim
18 words
The process as claimed in claim 2 wherein the foaming agent (C) is azodicarbonamide, N,N-dinitrosopentamethylene tetramine or trihydrazinotriazine.
Claim 10
Dependent Claim
32 words
The process as claimed in claim 2 wherein the foaming agent (C) is present in an amount of 5-20 parts by weight based on 100 parts by weight of the polyolefin (A).
Claim 11
Dependent Claim
17 words
The process as claimed in claim 2 wherein the organic peroxide (D) is an organic peroxy ester.
Claim 12
Dependent Claim
32 words
The process as claimed in claim 2 wherein the organic peroxide (D) is present in an amount of 0.01-2.0 parts by weight based on 100 parts by weight of the polyolefin (A).
Claim 13
Dependent Claim
20 words
The process as claimed in claim 1 wherein the foamable polyolefin sheet is heated at a temperature of 110°-160° C.
Claim 14
Dependent Claim
20 words
The process as claimed in claim 1 wherein the foamable polyolefin sheet is heated at a temperature of 120°-160° C.
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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |