US4510031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-foamable olefinic resin composition and process for production of olefinic resin foam from said composition
Assignee: Sekisui Chemical Co Ltd
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Filing: 1984-04-25
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Granted: 1985-04-09
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Expires: 2004-04-25
Abstract
Abstract A heat-foamable olefinic resin composition comprising (a) an ethylenic polymer, (b) a propylene/alpha-olefin copolymer having a melting point of 130° to 160° C., (c) a propylene polymer having a melting point at least 10° C. higher than the melting point of the propylene/alpha-olefin copolymer, and (d) a blowing agent, and optionally (e) a crosslinking agent and/or a crosslinking promoting agent; and a process for producing an olefinic resin foam comprising crosslinking and heat-foaming the aforesaid heat-foamable olefinic resin composition.
Inventors
- 👤 Michio Matsumura
- 👤 Takao Inoue
- 👤 Toshihiro Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2323/00; C08J2323/02; C08J2423/00; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
110 words
A heat-foamable olefinic resin composition comprising (a) an ethylene polymer selected from the group consisting of polyethylene and a copolymer derived from ethylene as a major component and at least one other ethylenically unsaturated monomer, (b) a propylene/alpha-olefin copolymer having a melting point of 130° to 160° C., (c) a propylene polymer selected from the group consisting of polypropylene and a copolymer derived from propylene as the major component and at least one other ethylenically unsaturated monomer, having a melting point at least 10° C. higher than the melting point of the propylene/alpha-olefin copolymer, and (d) a blowing agent, and optionally (e) a crosslinking agent and/or a crosslinking promoting agent.
Claim 2
Dependent Claim
110 words
A heat-foamable olefinic resin composition comprising (a) an ethylene polymer selected from the group consisting of polyethylene and a copolymer derived from ethylene as a major component and at least one other ethylenically unsaturated monomer, (b) a propylene/alpha-olefin copolymer having a melting point of 130° to 160° C., (c) a propylene polymer selected from the group consisting of polypropylene and a copolymer derived from propylene as the major component and at least one other ethylenically unsaturated monomer, having a melting point at least 10° C. higher than the melting point of the propylene/alpha-olefin copolymer, and (d) a blowing agent, and optionally (e) a crosslinking agent and/or a crosslinking promoting agent.
Claim 3
Dependent Claim
33 words
The composition of claim 1 wherein the ethylenic polymer (a) is selected from the group consisting of low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, ethylene/vinyl acetate copolymer and amorphous ethylene/propylene copolymer.
Claim 4
Dependent Claim
21 words
The composition of claim 1 wherein the ethylenic polymer (a) has a melt index in the range of 0.1 to 50.
Claim 5
Dependent Claim
26 words
The composition of claim 1 wherein the proportion of the ethylenic polymer (a) is 10 to 80% by weight based on the weight of the composition.
Claim 6
Dependent Claim
20 words
The composition of claim 1 wherein the propylene/alpha-olefin copolymer (b) is selected from ethylene/propylene random copolymer and ethylene/butene-1/propylene random copolymer.
Claim 7
Dependent Claim
18 words
The composition of claim 1 wherein the propylene/alpha-olefin copolymer (b) has a melt index of 0.1 to 50.
Claim 8
Dependent Claim
26 words
The composition of claim 1 wherein the proportion of the propylene/alpha-olefin copolymer (b) is 10 to 80% by weight based on the weight of the composition.
Claim 9
Dependent Claim
31 words
The composition of claim 1 wherein the propylene polymer (c) is selected from the group consisting of polypropylene, ethylene/propylene block copolymer, ethylene/propylene random copolymer, ethylene/butene/propylene random copolymer and ethylene/butene/propylene block copolymer.
Claim 10
Dependent Claim
18 words
The composition of claim 1 wherein the propylene polymer (c) has a melt index of 0.1 to 50.
Claim 11
Dependent Claim
26 words
The composition of claim 1 wherein the amount of the propylene polymer (c) is 5 to 40% by weight based on the weight of the composition.
Claim 12
Dependent Claim
28 words
The composition of claim 1 wherein the amount of the propylene polymer (c) is 20 to 200 parts per 100 parts by weight of the propylene/alpha-olefin copolymer (b).
Claim 13
Dependent Claim
24 words
The composition of claim 1 wherein the blowing agent (d) is a heat-decomposable blowing agent having a decomposition temperature of 180° to 270° C.
Claim 14
Dependent Claim
31 words
The composition of claim 1 wherein the amount of the blowing agent (d) is 0.1 to 40% by weight based on the total weight of the polymers (a), (b) and (c).
Claim 15
Dependent Claim
10 words
The composition of claim 1 which contains the crosslinking agent.
Claim 16
Dependent Claim
27 words
The composition of claim 14 wherein the crosslinking agent has a decomposition temperature of at least 120° C. when its decomposition half life is just 1 minute.
Claim 17
Dependent Claim
30 words
The composition of claim 1 wherein the amount of the crosslinking agent is 0.01 to 10% by weight based on the total weight of the polymers (a), (b) and (c).
Claim 18
Dependent Claim
30 words
The composition of claim 1 wherein the amount of the crosslinking promoting agent is 0.1 to 10% by weight based on the weight of the polymers (a), (b) and (c).
Claim 19
Dependent Claim
21 words
A process for producing an olefinic resin foam, which comprises crosslinking and heat-foaming the heat-foamable olefinic resin composition of claim 1.
Claim 20
Dependent Claim
22 words
The process of claim 18 wherein the resin composition containing the crosslinking agent is heated to 130° to 300° C. crosslink it.
Claim 21
Dependent Claim
17 words
The process of claim 18 wherein the crosslinking of the composition is effected by applying ionizing radiation.
Claim 22
Dependent Claim
19 words
The process of claim 19 wherein the crosslinking is effected until the degree of crosslinkage reaches 5 to 90%.
Claim 23
Dependent Claim
17 words
The process of claim 18 wherein the foam has an expansion ratio of from 3 to 50.
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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |