Title:
POLYPROPYLENE FOAM SHEET
Document Type and Number:
Japanese Patent JP2638532
Kind Code:
B2
Abstract:
PURPOSE: To obtain high impact strength, practical temp. and heat insulating properties by heating a foam sheet of polypropylene having a specific MZ or MZ/MW ratio and equilibrium compliance or specific restorable shearing strain to deformable temp. to soften the same and molding the heated sheet into a hard or semihard article.
CONSTITUTION: A foam sheet is obtained from a polyproplene resin having an MZ value higher than 1.0×106, an MZ/MW ratio higher than 3.0 and an equilibrium compliance Jeo value of above 1.2×10-3 m2/N or restorable shearing strain Sr/S per stress higher than 5.0× 10-4 m2/N at 1 sec-1 and aged for a definite time to expand a blowing agent. In the case of secondary processing, air is passed through cell walls before this processing to achieve equilibrium. The polypropylene foam sheet has an outer layer or skin almost free from cells and shows glassy appearance and has resistance against surface abrasion and cutting and also has bending rigidity.
Inventors:
GEIROODO NOONN JII
KAATSU RIION
PAAKU JON PII
KAATSU RIION
PAAKU JON PII
Application Number:
JP33516694A
Publication Date:
August 06, 1997
Filing Date:
December 21, 1994
Export Citation:
Assignee:
JEIMUZU RIBAA CORP ZA
International Classes:
B29C44/00; B29C51/10; B29C59/00; B32B5/18; B32B27/32; B65D65/02; C08F8/00; C08F110/06; C08J9/04; C08J9/12; C08J9/14; B29K23/00; B29K105/04; B29L7/00; B29L9/00; B29L22/00; B29L31/00; (IPC1-7): B29C51/10; B32B5/18; B32B27/32; C08J9/04
Domestic Patent References:
| JP5162868A | ||||
| JP53155578U |
Other References:
【文献】土田英俊著「高分子の科学」培風館(昭和50年12月10日)第15頁
【文献】特許庁編「周知・慣用技術集(発泡成形)」(昭和57年8月3日)第144頁
【文献】特許庁編「周知・慣用技術集(発泡成形)」(昭和57年8月3日)第144頁
Attorney, Agent or Firm:
Chika Takagi (2 outside)