Patent US2410143A successfully refreshed from Google Patents.
Patent US4456704A successfully refreshed from Google Patents.
US4456704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of foam
Assignee: Sekisui Kaseihin Kogyo KK
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Filing: 1982-10-08
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Granted: 1984-06-26
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Expires: 2002-10-08
Abstract
Abstract A method for producing cross-linked polyethylene resin foams which comprises mixing a polyolefin resin, a blowing agent and, optionally, a surface active agent containing hydroxyl groups or an acid amide compound under pressure, said polyolefin resin containing a cross-linkable ethylene polymer having on the side chains thereof silyl groups which effect cross-linking upon contact with water; extruding the mixture into a low pressure zone where the extrudate is allowed to expand; and bringing the expanded extrudate into contact with a silanol condensing catalyst so that the expanded extrudate is cross-linked on contact with water.
Inventors
- 👤 Mikio Fukumura
- 👤 Hideo Shibata
- 👤 Shuhei Doi
- 👤 Tsutomu Isaka
- 👤 Takayuki Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/0014; C08J9/36; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/16; C08J2423/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
77 words
A method for producing crosslinked polyethylene which consists essentially of: mixing a polyolefin resin and a blowing agent under pressure, the polyolefin containing a crosslinkable ethylene polymer having silyl groups on the side chains thereof, the silyl groups effecting crosslinking on contact with water; extruding the mixture into a low pressure zone, whereby the extrudate is expanded; and thereafter contacting the expanded extrudate with a silanol condensing catalyst, and crosslinking the expanded extrudate by contacting with water.
Claim 2
Independent Claim
77 words
A method for producing crosslinked polyethylene which consists essentially of: mixing a polyolefin resin and a blowing agent under pressure, the polyolefin containing a crosslinkable ethylene polymer having silyl groups on the side chains thereof, the silyl groups effecting crosslinking on contact with water; extruding the mixture into a low pressure zone, whereby the extrudate is expanded; and thereafter contacting the expanded extrudate with a silanol condensing catalyst, and crosslinking the expanded extrudate by contacting with water.
Claim 3
Dependent Claim
48 words
A method for producing crosslinked polyethylene foams as claimed in claim 1 wherein the crosslinkable ethylene polymer having the silyl groups on the side chains thereof is a random copolymer of ethylene and an unsaturated silane compound or a graft copolymer of ethylene and an unsaturated silane compound.
Claim 4
Dependent Claim
27 words
A method for producing crosslinked polyethylene foams as claimed in claim 1 wherein the polyolefin resin is a mixture of silylated ethylene polymer and other ethylene polymer.
Claim 5
Dependent Claim
29 words
A method for producing crosslinked polyethylene foams as claimed in claim 3 wherein the ethylene polymer is ethylene homopolymer, ethylene copolymer composed mainly of ethylene and a mixture thereof.
Claim 6
Independent Claim
87 words
A method for producing crosslinked polyethylene resin foams which consists essentially of: mixing a polyolefin resin, a blowing agent and a surface active agent containing hydroxyl groups under pressure, the polyolefin resin containing a crosslinkable ethylene polymer having silyl group on the side chains thereof, the silyl groups effecting crosslinking on contact with water; extruding the mixture into a low pressure zone, whereby the extrudate is expanded; and thereafter contacting the expanded extrudate with a silanol condensing catalyst, and crosslinking the expanded extrudate by contacting with water.
Claim 7
Independent Claim
87 words
A method for producing crosslinked polyethylene resin foams which consists essentially of: mixing a polyolefin resin, a blowing agent and a surface active agent containing hydroxyl groups under pressure, the polyolefin resin containing a crosslinkable ethylene polymer having silyl group on the side chains thereof, the silyl groups effecting crosslinking on contact with water; extruding the mixture into a low pressure zone, whereby the extrudate is expanded; and thereafter contacting the expanded extrudate with a silanol condensing catalyst, and crosslinking the expanded extrudate by contacting with water.
Claim 8
Dependent Claim
48 words
A method for producing crosslinked polyethylene foams as claimed in claim 5 wherein the crosslinkable ethylene polymer having the silyl groups on the side chains thereof is a random copolymer of ethylene and an unsaturated silane compound or a graft copolymer of ethylene and an unsaturated silane compound.
Claim 9
Dependent Claim
29 words
A method for producing crosslinked polyethylene foams as claimed in claim 5 or 6 wherein the polyolefin resin is a mixture of silylated ethylene polymer and other ethylene polymer.
Claim 10
Dependent Claim
29 words
A method for producing crosslinked polyethylene foams as claimed in claim 7 wherein the ethylene polymer is ethylene homopolymer, ethylene copolymer composed mainly of ethylene and a mixture thereof.
Claim 11
Dependent Claim
43 words
A method for producing crosslinked polyethylene foams as claimed in claim 5 wherein the surface active agent containing hydroxyl groups is selected from the group consisting of fatty acid monoglycerin ester, fatty acid polyglycol ester, fatty acid sorbitan ester and fatty acid alkanolamide.
Claim 12
Independent Claim
40 words
A method for producing crosslinked polyethylene foams as claimed in any one of claims 5 to 9 wherein the surface active agent containing hydroxyl groups is used in an amount of 0.1 to 10 wt% based on the polyolefin resin.
Claim 13
Independent Claim
84 words
A method for producing crosslinked polyethylene resin foams which consists essentially of: mixing a polyolefin resin, a blowing agent and an acid amide compound under pressure, the polyolefin resin containing a crosslinkable ethylene polymer having silyl groups on the side chains thereof, the silyl groups effecting crosslinking on contact with water; extruding the mixture into a low pressure zone, whereby the extrudate is expanded; and thereafter contacting the expanded extrudate with a silanol condensing catalyst, and crosslinking the expanded extrudate by contacting with water.
Claim 14
Independent Claim
84 words
A method for producing crosslinked polyethylene resin foams which consists essentially of: mixing a polyolefin resin, a blowing agent and an acid amide compound under pressure, the polyolefin resin containing a crosslinkable ethylene polymer having silyl groups on the side chains thereof, the silyl groups effecting crosslinking on contact with water; extruding the mixture into a low pressure zone, whereby the extrudate is expanded; and thereafter contacting the expanded extrudate with a silanol condensing catalyst, and crosslinking the expanded extrudate by contacting with water.
Claim 15
Dependent Claim
48 words
A method for producing crosslinked polyethylene foams as claimed in claim 11 wherein the crosslinkable ethylene polymer having the silyl groups on the side chains thereof is a random copolymer of ethylene and an unsaturated silane compound of a graft copolymer or ethylene and an unsaturated silane compound.
Claim 16
Dependent Claim
19 words
A method for producing crosslinked polyethylene foams as claimed in claim 11 or 12 wherein the polyolefin resin polymer.
Claim 17
Dependent Claim
29 words
A method for producing crosslinked polyethylene foams as claimed in claim 13 wherein the ethylene polymer is ethylene homopolymer, ethylene copolymer composed mainly of ethylene and a mixture thereof.
Claim 18
Dependent Claim
44 words
A method for producing crosslinked polyethylene foams as claimed in claim 11 wherein the acid amide compound is selected from the group consisting of primary, secondary and tertiary amides, in which a saturated hydrocarbon group of 6 to 22 carbon atoms forms the acid.
Claim 19
Dependent Claim
36 words
A method for producing crosslinked polyethylene foams as claimed in claim 15 wherein the amide group or groups of the acid amide compound are substituted by a saturated hydrocarbon group having 1 to 22 carbon atoms.
Claim 20
Dependent Claim
37 words
A method for producing crosslinked polyethylene foams as claimed in any one of claim 11 to 16 wherein the acid amide compound is used in an amount of 0.1 to 10 wt% based on the polyolefin resin.
Claim 21
Independent Claim
27 words
A method for producing crosslinked polyethylene foams, as claimed in any one of claims 1, 5 or 11, wherein the blowing agent is a volatile blowing agent.
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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |