Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1997-07-31
2000-04-18
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 56, 521 60, 521139, C08J 920, C08J 922, C08J 9224
Patent
active
060516178
ABSTRACT:
A foamed, non-crosslinked resin particle having a bulk density of not greater than 0.045 g/cm.sup.3 and an average cell diameter of at least 200 .mu.m. The non-crosslinked resin includes a polypropylene resin to which a vinyl comonomer is graft-polymerized in such an amount that the weight ratio of the polypropylene resin to the grafted polymer of the vinyl comonomer is in the range of 97:3 to 65:35. The foamed resin particles are produced by grafting a vinyl comonomer to polypropylene resin particles at a temperature of less than 90.degree. C. in the presence of a specific radical polymerization initiator to obtain modified polypropylene resin particles and, then, expanding the modified polypropylene resin particles. The initiator used requires a temperature of not higher than 70.degree. C. for obtaining a half life of 10 hours.
REFERENCES:
patent: 4303756 (1981-12-01), Kajimura et al.
patent: 4303757 (1981-12-01), Kajimura et al.
patent: 4657937 (1987-04-01), Kuwabara et al.
Sakaguchi Masakazu
Sasaki Hidehiro
Tokoro Hisao
Foelak Morton
JSP Corporation
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