Process for preparing polyolefin resin pre-expanded particles

Details Process for preparing polyolefin resin pre-expanded particles Process for preparing polyolefin resin pre-expanded particles

1998-03-23

1999-03-16

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 60, 521 56, 521 59, 264DIG9, C08J 922, C08J 9224

Patent

active

058831410

ABSTRACT:
A process for preparing polyolefin resin pre-expanded particles comprising imparting expandability to polyolefin resin expanded particles having a crystal structure which shows two melting points in a DSC curve and heat expanding expanded particles having expandability, in which the relation between heat expansion temperature and the amount of a fusion preventing agent being attached to the surface of the polyolefin resin expanded particles is represented by the inequality: t-T.sub.V .ltoreq.49.1C-27.0 (t is heat expansion temperature, C is the amount of the fusion preventing agent being attached to the surface of the polyolefin resin expanded particles and T.sub.V is saddle temperature between two peaks showing two respective melting points in the DSC curve), and t is within the temperature range represented by the inequality: T.sub.L -30.ltoreq.t.ltoreq.T.sub.V (T.sub.V is the same as defined above and T.sub.L is lower melting point of the two melting points). According to the process, mutual fusion of the expanded particles and increase of open cell ratio of the pre-expanded particles can be prevented at the same time, expansion efficiency can be increased, and polyolefin resin pre-expanded particles having high expansion ratio can be prepared.

REFERENCES:
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patent: 4861531 (1989-08-01), Maeda
patent: 5071883 (1991-12-01), Kuwabara et al.
patent: 5459169 (1995-10-01), Tokoro et al.
patent: 5679450 (1997-10-01), Tokoro et al.
patent: 5747549 (1998-05-01), Tsurugai et al.

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