EP0361418A2
Expired / Lapsed
EP
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Shape memory polymer foam
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1989-09-27
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Granted: —
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Expires: 2009-09-27
Abstract
Abstract A shape memory polymer foam which takes on a deformed shape and an as-molded shape, said deformed shape being produced when the polymer foam is compressed at a temperature higher than the glass transition point (Tg) of the polymer and then kept compressed at a temperature lower than the Tg until compression sets, said as-molded shape being produced when the compressed polymer foam is heated again to a temperature higher than the Tg until it recovers its original shape.
Inventors
- 👤 Shinuchi Nagoya Technical Institute Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 17:04
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/06; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; B; B29; B29C; B29C44/00; B29C44/34; B29C44/56; B29C61/00; B29C61/003; B29K; B29K2075/00; B29K2105/00; B29K2105/04; C08G2110/00; C08G2110/0008; C08G2250/00; C08G2280/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A shape memory polymer foam which takes on a deformed shape and an as-molded shape, said deformed shape being produced when the polymer foam is compressed at a temperature higher than the glass transition point of the polymer and then kept compressed at a temperature lower than the glass transition point until compression sets, said as-molded shape being produced when the compressed polymer foam is heated again to a temperature higher than the glass transition point until it recovers its original shape.
Claim 2
Dependent Claim
82 words
A shape memory polymer foam which takes on a deformed shape and an as-molded shape, said deformed shape being produced when the polymer foam is compressed at a temperature higher than the glass transition point of the polymer and then kept compressed at a temperature lower than the glass transition point until compression sets, said as-molded shape being produced when the compressed polymer foam is heated again to a temperature higher than the glass transition point until it recovers its original shape.
Claim 3
Dependent Claim
15 words
A shape memory polymer foam as claimed in Claim 1, wherein the polymer is polyurethane.
Claim 4
Dependent Claim
90 words
A shape memory polymer foam as claimed in Claim 2, which is a polyurethane foam produced by the prepolymer process from a compound composed of a difunctional diisocyanate, a difunctional polyol, and a difunctional chain extender containing active hydrogen, whose molar ratio is 2.00-1.10 : 1.00 : 1.00-0.10, and a blowing agent, said polyurethane containing approximately equal amounts of isocyanate groups and hydroxyl groups at the terminals of the polymer chains, and having a glass transition point in the range of -50 to 60°C and a crystallinity of 3-50 wt%.
References Cited (Backward Citations)
No citation records indexed.
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