Patent USRE31744E successfully refreshed from Google Patents.
USRE31744E
Expired / Lapsed
US
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Expanded olefin polymer
Assignee: Dow Chemical Co
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Filing: 1981-06-08
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Granted: 1984-11-20
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Expires: 2001-06-08
Abstract
Abstract A thermoplastic synthetic resin such as polyethylene or ethylene-vinyl acetate copolymer resin containing 0.1 to 10 wt. % of a specific additive selected from specific classes of compounds, namely saturated higher fatty acid amides, saturated higher aliphatic amines and complete esters of saturated higher fatty acids is found to be very suitable for production of expanded articles and can be easily formed into expanded articles with little shrinkage after expansion, free from creases on the surface or cracks on the cell walls, and having excellent characteristics such as good closed cellular characteristic, high compressive strength, low density, etc.
Inventors
- 👤 Seizaburo Watanabe
- 👤 Yutaka Matsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:12
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
412 words
groups are eliminated..].. 2. An expanded article according to claim 1, wherein the .[.polyolefin resin is a.]. olefin polymer is a polyethylene resin or an ethylenevinyl acetate copolymer resin. .[.3. A process for expanding an olefin polymer, which comprises incorporating at least one compound, which imparts little shrinkage to said expanded polymer after expansion, selected from the group consisting of the compounds of the formulas (I), (II) and (III) as set forth below in a thermoplastic synthetic resin in an amount of 0.1 to 10% by weight based on the weight of said resin together with a blowing agent under the condition maintained at a temperature in the range from about 15° to 300° C. to form an expandable resin composition and then allowing said resin composition to expand utilizing the expanding force of the blowing agent contained therein: ##STR15## wherein R 1 is an alkyl group having 10 to 24 carbon atoms, X and X' each hydrogen atom, an alkyl group having 1 to 24 carbon atoms which may be substituted or a substituent selected from the group consisting of --(CH 2 ) n NH 2 wherein n is an integer of 1 to 22, ##STR16## wherein R 5 is an alkyl having 1 to 24 carbon atoms, --(R 4 O) m H wherein R 4 is an alkylene group having 1 to 5 carbon atoms and m is an integer of 1 to 10, ##STR17## wherein R 5 is an alkyl having 1 to 24 carbon atoms, ##STR18## wherein n is an integer of 1 to 22 and A is hydrogen atom or ##STR19## wherein A' is hydrogen atom or ##STR20## wherein R 2 is an alkyl group having 9 to 23 carbon atoms, Y and Y' each hydrogen atom, an alkyl having 1 to 24 carbon atoms, an acyl having 10 to 24 carbon atoms or a substituent of the formula --(R 4 O) m A 2 wherein A 2 is hydrogen atom, an alkyl having 1 to 24 carbon atoms or acyl having 10 to 24 carbon atoms; ##STR21## wherein [R 3 ] means plural alkyl or hydroxyalkyl groups corresponding in number to the integer l, which may be the same or different, each having 9 to 23 carbon atoms, R 4 an alkylene group having 1 to 5 carbon atoms, k an integer of 0 to 7, l an integer of 2 to 8 and Z a l-valent residue of l-valent polyhydric alcohol from which l hydroxyl
Claim 2
Dependent Claim
11 words
groups are eliminated..]. 4. A process according to claim .[.3,.]. .Iadd.8
Claim 3
Dependent Claim
29 words
.Iaddend.wherein the olefin polymer is cross-linked. 5. A process according to claim .[.3,.]. .Iadd.8 .Iaddend.wherein the olefin polymer is a polyethylene resin, an ethylene-vinyl acetate copolymer resin, or a
Claim 4
Dependent Claim
21 words
polypropylene resin. 6. A process according to any of claims .[.3.]. .Iadd.8 .Iaddend.to 5, wherein the polymer composition is expanded by
Claim 5
Dependent Claim
301 words
extrusion foaming by means of an extruder. .Iadd.7. An expanded article of an olefin polymer composition comprising an olefin polymer and at least one compound, which reduces shrinkage of said expanded article after expansion, selected from the group consisting of the amide or complete ester compounds represented by the formula (II) or (III), respectively, as set forth below in an amount of 0.1 to 10 percent by weight based on the weight of said olefin polymer and having a closed cellular characteristic value of 0 to 0.5 g/cm 3 , a bulk density of 10 to 200 kg/m 3 and a compressive strength coefficient of 2.15×10 -3 to 2.89×10 -2 : ##STR22##.Iaddend. wherein R 2 is an alkyl group having 9 to 23 carbon atoms, Y and Y' each is a hydrogen atom, an alkyl having 1 to 24 carbon atoms, an acyl having 10 to 24 carbon atoms or a substituent of the formula --(R 4 O) m A 2 wherein R 4 is an alkylene group having 1 to 5 carbon atoms, m is an integer of 1 to 10, and A 2 is hydrogen atom, an alkyl having 1 to 24 carbon atoms or acyl having 10 to 24 carbon atoms; ##STR23## wherein [R 3 ] means plural alkyl or hydroxyalkyl groups corresponding in number to the integer l, which may be the same or different, each having 9 to 23 carbon atoms, R 4 is an alkylene group having 1 to 5 carbon atoms, k is an integer of 0 to 7, l is an integer of 2 to 8 and Z is an l-valent residue of an l-valent polyhydric alcohol of the formula Z(OH) l from which l hydroxyl groups are eliminated; said expanded article having been prepared by the use of a volatile organic blowing
Claim 6
Dependent Claim
299 words
agent. .Iadd.8. A process for expanding an olefin polymer, which comprises incorporating at least one compound, which reduces shrinkage of the resulting expanded polymer after expansion, selected from the group consisting of the amide or complete ester compounds of the formula (II) or (III), respectively, as set forth below into the olefin polymer to be expanded in an amount of 0.1 to 10 percent by weight based on the weight of said olfein polymer together with a volatile organic blowing agent under the condition maintained at a temperature in the range of from about 15° to 300° C. to form an expandable resin composition and then allowing said expandable resin composition to expand utilizing the expanding force of the blowing agent contained therein: ##STR24##.Iaddend. wherein R 2 is an alkyl group having 9 to 23 carbon atoms, Y and Y' each is a hydrogen atom, an alkyl having 1 to 24 carbon atoms, an acyl having 10 to 24 carbon atoms or a substituent of the formula --(R 4 O) m A 2 wherein R 4 is an alkylene group having 1 to 5 carbon atoms, m is an integer of 1 to 10, and A 2 is hydrogen atom, an alkyl having 1 to 24 carbon atoms or acyl having 10 to 24 carbon atoms; ##STR25## wherein [R 3 ] means plural alkyl or hydroxyalkyl groups corresponding in number to the integer l, which may be the same or different, each having 9 to 23 carbon atoms, R 4 is an alkylene group having 1 to 5 carbon atoms, k is an integer of 0 to 7, l is an integer of 2 to 8 and Z is an l-valent residue of an l-valent polyhydric alcohol of the formula Z(OH) l from which l hydroxyl groups are eliminated.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |