FOAMED PARTICLES OF PROPYLENE HOMOPOLYMER AND MOLDINGS OF SAID PARTICLES

Title:

FOAMED PARTICLES OF PROPYLENE HOMOPOLYMER AND MOLDINGS OF SAID PARTICLES

Document Type and Number:

WIPO Patent Application WO/1996/031558

Kind Code:

A1

Abstract:

Conventional moldings of foamed particles of propylene polymers have been estimated to be excellent in cushioning effect and impact resilience but not necessarily satisfactory in stiffnesses such as compressional stress. The formed particles of propylene homopolymers of the invention have a modulus in tension of 15,000-25,000 kg/cm2 and a crystal structure which exhibits both of proper and high-temperature peaks as the endothermic peak in the DSC curve obtained by differential scanning calorimetry, the high-temperature peak having a heat quantity of 30-60 J/g. Moldings produced from the above foamed particles have a density of 0.01-0.3 g/cm3 and a modulus in tension of 15,000-25,000 kg/cm2. The DSC curves thereof reveal that, as in the case of the foamed particles per se, the crystal structures exhibit both of the proper and high-temperature peaks and the high-temperature peak has a heat quantity of 30-60 J/g, as well.

Inventors:

TSURUGAI KAZUO (JP)
TOKORO HISAO (JP)
OIKAWA MASAHARU (JP)

Application Number:

PCT/JP1996/000943

Publication Date:

October 10, 1996

Filing Date:

April 05, 1996

Export Citation:

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Assignee:

JSP CORP (JP)
TSURUGAI KAZUO (JP)
TOKORO HISAO (JP)
OIKAWA MASAHARU (JP)

International Classes:

C08J9/18; C08J9/16; C08L23/10; C08L23/12; C08F110/06; (IPC1-7): C08J9/16; B29C44/00

Foreign References:

JPH05179049A	1993-07-20
JPS6049040A	1985-03-18
JPH03254930A	1991-11-13

Other References: