Title:
【発明の名称】形状記憶性管体及びその施工方法
Document Type and Number:
Japanese Patent JPH066349
Kind Code:
B2
Abstract:
A shape memory hollow body which is molded from a polyurethane elastomer produced by prepolymer process from a raw material composed of a difunctional diisocyanate, difunctional polyol, and difunctional chain extender containing active hydrogen in a molar ratio of 2.00-1.10 : 1.00 : 1.00-0.10, said polyurethane elastomer containing NCO groups and OH groups in almost equal amounts at the terminals of the polymer chains and having a glass transition point in the range of -50 to 60 DEG C and a crystallinity of 3 to 50 wt%, said hollow body remembering its asmolded basic shape but taking on a deformed shape which is given when it is deformed at a temperature higher than the glass transition point of the polymer and lower than the molding temperature and then set when it is cooled in the deformed state to a temperature lower than the glass transition point. A method of working the above-mentioned shape memory hollow body (1a) remembering its basic shape, said method prising the steps of deforming the hollow body (1a) at a temperature higher than the glass transition point and lower than the molding temperature and then cooling it in the deformed state to a temperature lower than the glass transition point, thereby setting it in the deformed state, combining the deformed hollow body (1b) with another member, (2),and heating the combination (3a) to a temperature higher than the glass transition point, thereby causing it to restore its basic shape and achieving firm bonding of the hollow body (1a) to the member.
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Inventors:
SHIMIZU MAKOTO
HAYASHI SHUNICHI
HAYASHI SHUNICHI
Application Number:
JP26049188A
Publication Date:
January 26, 1994
Filing Date:
October 18, 1988
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
E03C1/12; B29C35/02; B29C61/00; B29D23/00; C08G18/10; C08G18/65; F16L11/12; B29C63/00; B29K75/00; (IPC1-7): B29D23/22; B29C35/02; C08G18/10; C08G18/65; E03C1/12; F16L11/12
Domestic Patent References:
| JP62129028A | ||||
| JP58118211A | ||||
| JP61293214A |
Attorney, Agent or Firm:
Akira Uchida (3 outside)
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