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US4766157A
Expired / Lapsed
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Foamed particles of propylene-type polymer
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1986-12-16
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Granted: 1988-08-23
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Expires: 2006-12-16
Abstract
Abstract Foamed particles of propylene-type polymer of substantially non-crosslinked type, wherein the propylene-type polymer particles have a Melt Index of from 0.1 to 20, said polymer is at least one member selected from the group consisting of: (a) a soft polypropylene homopolymer having an <mmmm> partial rate of a stereoregular pentad partial rate by 13C-NMR Spectrum of from 45 to 85% and a fusion heat quantity of from 5 to 22 cal/g; and (b) a random copolymer of propylene and an alpha -olefin having a carbon number of 4 or more, or a random copolymer of propylene, an alpha -olefin having a carbon number of 4 or more, and ethylene, in which the content of the alpha -olefin having a carbon number of 4 or more is from 7 to 30 mol %, the content of ethylene is 5 mol % or less, and the cold xylene-soluble matter of said copolymer is from 15 to 60 wt %, said polymer particles being foamed with the use of an evaporation type blowing agent.
Inventors
- 👤 Hideaki Yamada
- 👤 Satoru Hosoda
- 👤 Tadatoshi Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J2323/00; C08J2323/02; C08J2323/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
166 words
Foamed particles of propylene-type polymer of substantially non-crosslinked type, wherein the propylene-type polymer particles have a Melt Index of from 0.1 to 20, said polymer is at least one member selected from the group consisting of: (a) a soft polypropylene homopolymer having an <mmmm> partial rate of a stereoregular pentad partial rate by 13 C-NMR spectrum of from 45 to 85% and a fusion heat quantity of from 5 to 22 cal/g; and (b) a random copolymer of propylene and an α-olefin having a carbon number of 4 or more, or a random copolymer of propylene, an α-olefin having a carbon number of 4 or more, and ethylene, in which the content of the α-olefin having a carbon number of 4 or more is from 7 to 30 mol%, the content of ethylene is 5 mol% or less, and the cold xylene-soluble matter of said copolymer is from 15 to 60 wt%, said polymer particles being foamed with the use of an evaporation type blowing agent.
Claim 2
Dependent Claim
166 words
Foamed particles of propylene-type polymer of substantially non-crosslinked type, wherein the propylene-type polymer particles have a Melt Index of from 0.1 to 20, said polymer is at least one member selected from the group consisting of: (a) a soft polypropylene homopolymer having an <mmmm> partial rate of a stereoregular pentad partial rate by 13 C-NMR spectrum of from 45 to 85% and a fusion heat quantity of from 5 to 22 cal/g; and (b) a random copolymer of propylene and an α-olefin having a carbon number of 4 or more, or a random copolymer of propylene, an α-olefin having a carbon number of 4 or more, and ethylene, in which the content of the α-olefin having a carbon number of 4 or more is from 7 to 30 mol%, the content of ethylene is 5 mol% or less, and the cold xylene-soluble matter of said copolymer is from 15 to 60 wt%, said polymer particles being foamed with the use of an evaporation type blowing agent.
Claim 3
Dependent Claim
22 words
Foamed particles of propylene-type polymer as in claim 1, wherein said α-olefin having a carbon number of 4 or more is butene-1.
Claim 4
Dependent Claim
28 words
Foamed particles of propylene-type polymer as in claim 1, wherein said propylene-type polymer is obtained by polymerization in its gaseous phase in substantial absence of a liquid medium.
Claim 5
Dependent Claim
80 words
Foamed particles of propylene-type polymer as in claim 1, wherein said polymer is at least one member selected from the group consisting of: (a) homopolypropylene having a melting point of about 160° C. and having a viscoelasticity which renders it blowable at around the melting point; and (b) a material whose melting point is lowered by random copolymerization between propylene and other comonomer, and which has a small variation between the viscoelasticities before and after the fusion of the material.
Claim 6
Dependent Claim
29 words
Foamed particles of propylene-type polymer as in claim 1, wherein the content of the α-olefin having a carbon number of 4 or more is from 10 to 25 mol%.
Claim 7
Dependent Claim
32 words
Foamed particles of propylene-type polymer as in claim 1, wherein said evaporation type blowing agent is added in an amount of from 2 to 25 wt% with respect to the propylene-type polymer.
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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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |