US4252906A
Expired / Lapsed
US
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Process for preparing foamed and crosslinked shaped articles having improved heat-sealability and foamable and crosslinkable polyethylene resin composition used therefor
Assignee: Sekisui Chemical Co Ltd
•
Filing: 1977-09-07
•
Granted: 1981-02-24
•
Expires: 1997-09-07
Abstract
Abstract A process for preparing a foamed and crosslinked polyethylene resin shaped article having improved heat-sealability, which comprises melt-kneading (a) a silane-modified polyethylene resin, (b) a heat-decomposable blowing agent, (c) a silanol condensation catalyst, and (d) an organic peroxide at a temperature lower than the decomposition temperature of the heat-decomposable blowing agent (b), shaping the mixture, and heating the resulting foamable and crosslinkable shaped articles to the decomposition temperature of the heat-decomposable blowing agent or to a higher temperature thereby to foam and crosslink it; and a foamable and crosslinkable polyethylene resin composition used therefor.
Inventors
- 👤 Seiya Hosokawa
- 👤 Ken Shinkai
- 👤 Tateo Takasuka
- 👤 Yutaka Ozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0023; C08J9/04; C08J9/06; C08J9/10; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08K5/04; C08K5/14; C08K5/16; C08K5/22; C08K5/23; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2323/26; Y; Y10; Y10S; Y10S521/00; Y10S521/909
Claims Analysis
Total Claims: 60
Claim 1
Independent Claim
134 words
A process for producing a foamed and cross-linked polyethylene resin shaped article having improved heat-sealability which comprises adding (b) a heat-decomposable blowing agent, (c) a silanol condensation catalyst and (d) an organic peroxide having a decomposition temperature the same as or similar to that of the heat-decomposable blowing agent (b) to (a) a silane-modified polyethylene resin, the amount of said organic peroxide (d) being at least 0.005 part by weight per 100 parts by weight of the silane-modified polyethylene resin (a); melt-kneading the resulting mixture at a temperature lower than the decomposition temperature of the heat-decomposable blowing agent (b); shaping the mixture; and heating the resulting foamble and cross-linkable shaped article to the decomposition temperature of the heat-decomposable blowing agent or to a higher temperature thereby to foam and cross-link the silane-modified polyethylene resin.
Claim 2
Dependent Claim
134 words
A process for producing a foamed and cross-linked polyethylene resin shaped article having improved heat-sealability which comprises adding (b) a heat-decomposable blowing agent, (c) a silanol condensation catalyst and (d) an organic peroxide having a decomposition temperature the same as or similar to that of the heat-decomposable blowing agent (b) to (a) a silane-modified polyethylene resin, the amount of said organic peroxide (d) being at least 0.005 part by weight per 100 parts by weight of the silane-modified polyethylene resin (a); melt-kneading the resulting mixture at a temperature lower than the decomposition temperature of the heat-decomposable blowing agent (b); shaping the mixture; and heating the resulting foamble and cross-linkable shaped article to the decomposition temperature of the heat-decomposable blowing agent or to a higher temperature thereby to foam and cross-link the silane-modified polyethylene resin.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the silane-modified polyethylene resin is obtained by chemically bonding a silane compound containing at least one unsaturated group to a polyethylene resin in the presence of a radical generator.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein the silane compound is selected from the group consisting of vinyltrimethoxysilane and vinyltriethoxysilane.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the heat-decomposable blowing agent has a decomposition temperature of more than 140° C.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the heat-decomposable blowing agent has a decomposition temperature within the range of 170° to 220° C.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the heat-decomposable blowing agent is selected from the group consisting of azodicarbonamide, dinitrosopentamethylene tetramine, benzenesulfonyl hydrazide and toluenesulfonyl hydrazide.
Claim 8
Dependent Claim
32 words
The process of claim 1 wherein the heat-decomposable blowing agent is used in an amount of at least 0.1 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the silanol condensation catalyst is a zinc salt of a higher carboxylic acid.
Claim 10
Dependent Claim
35 words
The process of claim 8 wherein the zinc salt of a higher carboxylic acid is selected from the group consisting of zinc salts of aliphatic and alicyclic carboxylic acids containing 8 to 20 carbon atoms.
Claim 11
Dependent Claim
26 words
The process of claim 1 wherein the silanol condensation catalyst is selected from the group consisting of zinc stearate, zinc octanoate, zinc laurate and zinc naphthenate.
Claim 12
Dependent Claim
32 words
The process of claim 1 wherein the silanol condensation catalyst is used in an amount of at least 0.01 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 13
Dependent Claim
18 words
The process of claim 1 wherein the organic peroxide has a decomposition temperature of more than 140° C.
Claim 14
Dependent Claim
21 words
The process of claim 1 wherein the organic peroxide has a decomposition temperature within the range of 170° to 220° C.
Claim 15
Dependent Claim
22 words
The process of claim 1 wherein the organic peroxide has a half life of at least 0.5 minute at the melt-kneading temperature.
Claim 16
Dependent Claim
24 words
The process of claim 1 wherein the organic peroxide is selected from the group consisting of ketone peroxides, hydroperoxides, dialkyl peroxides and peroxy esters.
Claim 17
Dependent Claim
22 words
The process of claim 1 wherein the organic peroxide is selected from the group consisting of dicumyl peroxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 2,5-dimethyl-2,5-di(tert-butyl peroxy)hexane.
Claim 18
Dependent Claim
31 words
The process of claim 1 wherein the organic peroxide is used in an amount of at least 0.005 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 19
Dependent Claim
31 words
The process of claim 1 wherein the organic peroxide is used in an amount of 0.01 to 1.0 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 20
Dependent Claim
22 words
The process of claim 1 wherein the melt-kneading is carried out at a temperature of about 110° C. to about 150° C.
Claim 21
Dependent Claim
23 words
The process of claim 1 wherein the foamable and crosslinkable shaped article has a gel content of not more than 45% by weight.
Claim 22
Dependent Claim
21 words
The process of claim 1 wherein the shaped article is in the form of a sheet, rod, cylinder, board or block.
Claim 23
Dependent Claim
32 words
The process of claim 1 wherein the heat-decomposable blowing agent is used in an amount of 1 to 30 parts by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 24
Dependent Claim
32 words
The process of claim 1 wherein the silanol condensation catalyst is used in an amount of 0.1 to 20 parts by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 25
Dependent Claim
22 words
The process of claim 1 wherein the foamable and crosslinkable shaped article has a gel content of 10 to 40% by weight.
Claim 26
Dependent Claim
62 words
The process of claim 3 wherein the heat-decomposable blowing agent is selected from the group consisting of azodicarbonamide, dinitrosopentamethylene tetramine, benzenesulfonyl hydrazide and toluenesulfonyl hydrazide, the silanol condensation catalyst is selected from the group consisting of zinc stearate, zinc octanoate, zinc laurate and zinc naphthenate; and the organic peroxide is selected from the group consisting of dicumyl peroxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 2,5-dimethyl-2,5-dimethyl-2,5-di(tert-butyl peroxy)hexane.
Claim 27
Dependent Claim
84 words
The process of claim 25 wherein the heat-decomposable blowing agent is used in an amount of at least 0.1 part by weight per 100 parts by weight of the silane-modified polyethylene resin; the silanol condensation catalyst is used in an amount of at least 0.01 part by weight per 100 parts by weight of the silane-modified polyethylene resin and the organic peroxide is used in an amount of at least 0.005 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 28
Dependent Claim
64 words
The process of claim 26 wherein, per 100 parts by weight of the silane-modified polyethylene resin, the heat-decomposable blowing agent is used in an amount of 1 to 30 parts by weight, the silanol condensation catalyst is used in an amount of 0.1 to 20 parts by weight, and the organic peroxide is used in an amount of 0.01 to 1.0 part by weight.
Claim 29
Dependent Claim
13 words
The process of claim 27 wherein the silanol condensation catalyst is zinc stearate.
Claim 30
Dependent Claim
18 words
A heat sealable foamed and cross-linked silane-modified polyethylene resin shaped article produced by the process of claim 1.
Claim 31
Dependent Claim
32 words
The process of claim 1 wherein the organic peroxide (d) is used in amount of 0.05 to 0.5 part by weight, per 100 parts by weight of the silane-modified polyethylene resin (a).
Claim 32
Dependent Claim
32 words
The process of claim 1 wherein the organic peroxide (d) is used in amount of 0.1 to 0.3 part by weight, per 100 parts by weight of the silane-modified polyethylene resin (a).
Claim 33
Dependent Claim
75 words
A foamable and cross-linkable polyethylene resin composition comprising (a) a silane-modified polyethylene resin, (b) a heat-decomposable blowing agent, (c) a silanol condensation catalyst, and (d) an organic peroxide in an amount of at least 0.005 part by weight per 100 parts by weight of the silane-modified polyethylene resin (a), the ingredients (a), (b), (c) and (d) having been melt-kneaded with one another at a temperature lower than the decomposition temperature of the heat-decomposable blowing agent.
Claim 34
Dependent Claim
75 words
A foamable and cross-linkable polyethylene resin composition comprising (a) a silane-modified polyethylene resin, (b) a heat-decomposable blowing agent, (c) a silanol condensation catalyst, and (d) an organic peroxide in an amount of at least 0.005 part by weight per 100 parts by weight of the silane-modified polyethylene resin (a), the ingredients (a), (b), (c) and (d) having been melt-kneaded with one another at a temperature lower than the decomposition temperature of the heat-decomposable blowing agent.
Claim 35
Dependent Claim
35 words
The composition of claim 32 wherein the silane-modified polyethylene resin is obtained by chemically bonding a silane compound containing at least one unsaturated group to a polyethylene resin in the presence of a radical generator.
Claim 36
Dependent Claim
19 words
The composition of claim 33 wherein the silane compound is selected from the group consisting of vinyltrimethoxysilane and vinyltriethoxysilane.
Claim 37
Dependent Claim
19 words
The composition of claim 33 wherein the silane compound is selected from the group consisting of vinyltriethoxysilane and vinyltriethoxysilane.
Claim 38
Dependent Claim
19 words
The composition of claim 32 wherein the heat-decomposable blowing agent has a decomposition temperature of 170° to 220° C.
Claim 39
Dependent Claim
25 words
The composition of claim 32 wherein the heat-decomposable blowing agent is selected from the group consisting of azodicarbonamide, dinitrosopentamethylene tetramine, benzenesulfonyl hydrazide and toluenesulfonyl hydrazide.
Claim 40
Dependent Claim
32 words
The composition of claim 32 wherein the heat-decomposable blowing agent is used in an amount of at least 0.1 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 41
Dependent Claim
19 words
The composition of claim 32 wherein the silanol condensation catalyst is a zinc salt of a higher carboxylic acid.
Claim 42
Dependent Claim
31 words
The composition of claim 39 wherein the zinc salt of a higher carboxylic acid is selected from zinc salts of aliphatic and alicyclic carboxylic acids containing 8 to 20 carbon atoms.
Claim 43
Dependent Claim
26 words
The composition of claim 32 wherein the silanol condensation catalyst is selected from the group consisting of zinc stearate, zinc octanoate, zinc laurate and zinc naphthenate.
Claim 44
Dependent Claim
32 words
The composition of claim 32 wherein the silanol condensation catalyst is used in an amount of at least 0.01 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 45
Dependent Claim
24 words
The composition of claim 32 wherein the organic peroxide has a decomposition temperature same as or similar to that of the heat-decomposable blowing agent.
Claim 46
Dependent Claim
18 words
The composition of claim 32 wherein the organic peroxide has a decomposition temperature of more than 140° C.
Claim 47
Dependent Claim
18 words
The composition of claim 32 wherein the organic peroxide has a decomposition temperature of 170° to 220° C.
Claim 48
Dependent Claim
23 words
The composition of claim 32 wherein the organic peroxide has a half life of at least 0.5 minute at the melt kneading temperature.
Claim 49
Dependent Claim
24 words
The composition of claim 32 wherein the organic peroxide is selected from the group consisting of ketone peroxides, hydroperoxides, dialkyl peroxides and peroxy esters.
Claim 50
Dependent Claim
22 words
The composition of claim 32 wherein the organic peroxide is selected from the group consisting of dicumyl peroxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 2,5-dimethyl-2,5-di(tert-butyl peroxy)hexane.
Claim 51
Dependent Claim
31 words
The composition of claim 32 wherein the organic peroxide is used in an amount of 0.01 to 1.0 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 52
Dependent Claim
17 words
The composition of claim 32 which has a gel content of not more than 45% by weight.
Claim 53
Dependent Claim
18 words
The composition of claim 32 which is in the form of a sheet, rod, cylinder, board or block.
Claim 54
Dependent Claim
32 words
The composition of claim 32 wherein the heat-decomposable blowing agent is used in an amount of 1 to 30 parts by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 55
Dependent Claim
32 words
The composition of claim 32 wherein the silanol condensation catalyst is used in an amount of 0.1 to 20 parts by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 56
Dependent Claim
16 words
The composition of claim 32 which has a gel content of 10 to 40% by weight.
Claim 57
Dependent Claim
64 words
The composition of claim 34 wherein the heat-decomposable blowing agent is selected from the group consisting of azodicarbonamide, dinitrosopentamethylene tetramine, benzenesulfonyl hydrazide and toluenesulfonyl hydrazide; the silanol condensation catalyst is selected from the group consisting of zinc stearate, zinc octanoate, zinc laurate and zinc naphthenate; and the organic peroxide is selected from the group consisting of ketone peroxides, hydroperoxides, dialkyl peroxides and peroxy esters.
Claim 58
Dependent Claim
84 words
The composition of claim 55 wherein the heat-decomposable blowing agent is used in an amount of at least 0.1 part by weight per 100 parts by weight of the silane-modified polyethylene resin; the silanol condensation catalyst is used in an amount of at least 0.01 part by weight per 100 parts by weight of the silane-modified polyethylene resin; and the organic peroxide is used in an amount of at least 0.005 part by weight per 100 parts by weight of the silane-modified polyethylene resin.
Claim 59
Dependent Claim
64 words
The composition of claim 56 wherein, per 100 parts by weight of the silane-modified polyethylene resin, the heat-decomposable blowing agent is used in an amount of 1 to 30 parts by weight, the silanol condensation catalyst is used in an amount of 0.1 to 20 parts by weight, and the organic peroxide is used in an amount of 0.01 to 1.0 part by weight.
Claim 60
Dependent Claim
13 words
The composition of claim 57 wherein the silanol condensation catalyst is zinc stearate.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |